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Home My WebLink About950200203 Drainage Report NORTHWESTERN TERRITORIES, INC. A JLS GROUP COMPANY 717 SOUTH PEABODY STREET, PORT ANGELES, WA 98362 ~ [] Engineers [] Land Surveyors [] Geologists N TI [] Construction Inspection [] Materials Testing (360) 452-8491 FAX 452-8498 www.nti4u.com E-Mail: infc~nti4u.com JLS GROUP~ INC. DRAINAGE, EROSION & SEDIMENT CONTROL REPORT TRAILS END SUBDIVISION, DIVISION 4, BLOCK 2, LOTS 3 & 4 SECTION 16, TOWNSHIP 27 NORTH, RANGE 1 EAST, W.M, JEFFERSON COUNTY WASHINGTON - PARCEL NUMBER 950-200-203. Prepared for Tom Halverson Prepared by Robert A. Leach, P.E. Northwestern Territories, Inc. 717 South Peabody Port Angeles, WA 98362 September 29, 2002 I. INTRODUCTION Northwestern Territories, Inc. (NTI) was hired by Tom Halverson to develop a drainage plan for the proposed construction of a private home on Lots 3 & 4, Block 2, Division 4 of the Trails End subdivision located in Eastern Jefferson County near South Point. As part of this analysis, a stormwater drainage infiltration trench disposal system was designed to collect and dispose of the stormwater runoff from the roof and driveway of the proposed home. II. DESCRIPTION'OF SITE This 14,400 SF (33 acre), 2 lot site is currently covered with trees, brush and "poor" grass and slopes towards the east at variable rate up to slightly over 15%. The site is located in Section 16, Township 27 North, Range 1 East, WM overlooking the western shore of Hood Canal and is accessed by Kelso Drive off of South Point Road. A geotechnical investigation was performed on the site in June, 2002 to determine slope stability. The soil on the site was found to be a gravelly sand and classified as an Alderwood (AIC) soil and is in the hydrologic group "C" soil type. A copy of the slope stability report and soils investigation is included in the appendix. As a result of this additional study and a closer comparison with the Soil Conservation Service and other maps, this site is located in an area approximately 500' farther west than originally thought and re-categorizes the soil as Hoypus Gravelly, Sandy, Loam (HuC) and is in the hydrologic group "A" soil type. Information on this soil type is included in the appendix. III. METHODOLOGY & CALCULATIONS Jefferson County requires the use of the Department of Ecology (DOE) Stormwater Manual which uses a 2, 10 and 100 year frequency, 24 hour duration storm and the Santa Barbara Urban Hydrograph (SBUH) method of simulation to approximate the increase in storm drainage runoff resulting from the development. The site slopes to the east which allows for the design of a single stormwater collection and discharge system. The site has been modeled using the Water Works Version 4.13i computer software from Engenious Systems. This program uses the (SBUH) Method of simulation as required by the DOE Manual. The recommended drainage disposal method for this project is infiltration due to the soil type and its infiltration capacity. The design is based on the land use and size of collection area. The driveway will be sloped to drain into a catch basin which is connected to the collection system. The roof runoff will be collected via gutters and down spouts. The drainage is released into the infiltration trench via a catch basin /leaf trap device. An emergency overflow line is connected to the catch basin and drains down slope of the drainage system. A drainage plan and full simulation report created by the Water Works software are included in the appendix. The following parameters were used for the primary variable's input values that were used in this analysis: · 2 year, 24 hour rainfall for South Point: 1.50" per NOAA precipitation atlas 25 year, 24 hour rainfall for South Point= 2.25" per NOAA precipitation atlas 100 year, 24 hour rainfall for South Point - 3.25" per NOAA precipitation atlas · Post-construction Impervious Areas: 0.044 AC Pavement and roof Curve Number = 98 · Pre-construction Pervious Areas: 50% (0.17 AC) Lawn (Fair Condition) Curve Number = 77 50% (0.17 AC) Wooded Curve Number = 55 Weighted Average = 66 · Post-construction Pervious Areas: 75% (0.23 AC) Lawn (Good Condition) Curve Number = 68 25% (0.07AC) Wooded Curve Number = 55 Weighted Average = 64.75 · Storm Type = SCS Type lA; duration = 24 hours · Time of Concentration calculated by software based upon existing and assumed drainage co, llection facilities. · Infiltration Rate -- 6 minutes / inch. This is based on the high porosity of the soil and the limit allowed by DOE's manual. · Collection Devices - gutters, scuppers and channel drains. · Disposal Device = underground infiltration trench corresponding to the 2, 25 and 100 year pre-development 24 hour storms. · Due to the topography, the infiltration system will be placed on the downhill side of the home. A minimum of 30' separation is required from the septic system and a 5' separation from all property lines. IV. DISCUSSION & ANALYSIS The analysis included in the appendix shows the following: note: an elevation of 100.00 is used as the bottom of the level infiltration trench; all other dimensions are relative to this elevation. · The size of the discharge orifices (0.012") indicate that a control release orifice is not needed given the soil's ability to adsorb. A "dummy" discharge unit is needed for the computer program to operate · The maximum elevation of water in the infiltration trench for the 100 year storm is 102.99 with the top of the trench and overflow elevation = 103.00. The trench design calls for 2' of trench backfill over the infiltration trench. Geo-technical filter fabric is required on all sides of the infiltration trench to prohibit the migration of small soil particles into the drain rock chamber. · The infiltration trench will be filled with drainrock with a void ratio of 33%. The infiltration trench's calculated volume (3 x 3 x 8.0 = 36 cf)is increased, therefore, by 3 to maintain the necessary storage volume (3 x 3 x 24). · Piping placement can be field located to best match the down spout pattern. Minimum setbacks for facilities are 30' from drainfields and 5' from property lines. V. CONCLUSIONS & RECOMMENDATIONS The drainage system includes two WSDOT type 1 or similar catch basins (one in the driveway with a pollution control tee and one for a leaf trap prior infiltration), a 24.0 foot long by 3 foot wide by 3 foot deep infiltration trench, 6" diameter ASTM D-3034 PVC collection lines and an emergency overflow. The emergency overflow will drain to the traditional drainage route off site. Clean outs are required on all down spout and catch basin collection lines whenever bends sum an angle of 90°. See the appendix for system details. A silt fence shall be placed downstream of the construction area prior to disturbance of the existing lot and remain until the landscaping is mature and will prevent silt leaving the site. See the appendix for silt fence details VI. LIMITATIONS This report has been prepared for the exclusive use of Tom Halverson for his proposed private home in the South Point region of Jefferson County. The recommendations in the report apply only to the property that was examined and 3 they are not applicable to other areas. The investigation and recommendations contained in this report are based upon site conditions as they existed at the time of our site inspections. During construction, if subsurface or other conditions are discovered that are significantly different from those described in the report, NTI should be advised at once so that we can review the conditions and reconsider our recommendations, where necessary. Unanticipated soil conditions are commonly encountered on construction sites, especially when the topography has been altered years ago. Such unexpected conditions frequently require that additional expenditures be made to attain a properly constructed project. We recommend that a contingency be established in the project budget and schedule to cover unexpected conditions. Within the limitations of scope, schedule and budget, our services have been executed in accordance with generally accepted professional engineering principles and practice. This warranty is in lieu of all others, either expressed or implied. NORTHWESTERN TERRITORIES, INC. Robed A. Leach, P.E. 9/29/02 Principal Design Engineer EXPII~ES 12/30/2002 G:\Gen\Bob\Halverson\Halverson drainage report.wpd 4 APPENDIX MAPS & DRAWINGS ~ m>~m r- m~ -<~zo r-ho ~0 jj o ~ PROPOSED .~,.k BEDROOM 5'~ o' 1~o' ~ so' RESIDENCE 0 121 54 TOP OF SLOP~ DRAIN S lb T '~ R I~' DATE: ~-2~"' PROJ E CT: '~)~ ,/~etG¢ P~-..~/',-) Engin~. L,nd Surveyors. Planners Construction Coo~ination · Baterials Testing FOR: ~ ~ ~VE~O~ NTJ 7,7 SOUTH PEABODY- PORT A.GELES, WASHINGTON 9.~2 -(3.) 4S2~9, SHT: ~ OF ,,.o m>,~ z,~.1.' '-O m>~ < ,) ,._._ * PROPOSED 3 -- BEDROOM '~o' 5'.. '~o'3o' o ?2'-o" 7' '~- ~....~_ I / I/~'~ _ TOpOF Sl_Op~ ;HINGTON -- SHEET NUMBER 62 I I ~0 000 FEET (Joins k~,er left ) R. 1 W. ~ 531 000 FEET I 530 ~ FEET I m SITE DATA SITE DATA I S R I DATE: T DESIGNED BY: ~'~ NORTHWESTERN TERRITORIES, INC. PROJECT: Engin~ · Land Su~eyom · Planne~ Construction C~ination · Materials Testing ~o~: NTI SHT: OF 717 SO~H PEABODY- PORT ANGELES, WASHINGTON ~62 "(3~) 452~91 STORMWATER MANAGEMENT MANUAL FOR THE PUGET SOUND BASIN Table III-1.3 SCS Western Washington Runoff Curve Numbers (Published by SCS in 1982) Runoff curve numbers for selected agricultural, suburban and urban land use for Type lA rainfall distribution, 24-hour storm duration. LAND USE DESCRIPTION CURVE NUMBERS BY HYDROLOGIC SOIL GROUP A B C D Cultivated land(l}: .winter condition 86 91 94 95 Mountain open areas: low growing brush & grasslands 74 82 89 92 Meadow or pasture: 65 78 85 89 Wood or forest land: undisturbed 42 64 76 81 Wood or forest land: young second growth or brush 55 72 81 86 Orchard: with cover cro~ 81 88 92 94 Open spaces, lawns, parks, golf courses, cemeteries, landscaping. Good condition: grass cover on k75% of the 68 80 86 90 area Fair condition: grass cover on 50-75% of 77 85 90 92 the area Gravel roads & parking lots: 76 85 89 91 Dirt roads & ~arkin~ lots: 72 82 87 89 Impervious surfaces, pavement, roofs etc. 98 98 98 98 O~en water bodies: -lakes, wetlands, ~onds etc. 100 100 100 100 Single family residential(2): Dwelling Unit/Gross Acre %Impervious(3) Separate curve number 1.0 DU/GA 15 shall be selected for 1.5 DU/GA 20 pervious & impervious 2.0 DU/GA 25 portions of the site 2.5 DU/GA 30 or basin 3.0 DU/GA 34 3.5 DU/GA 38 4.0 DU/GA 42 4.5 DU/GA 46 5.0 DU/GA 48 5.5 DU/GA 50' ~ 6.0 DU/GA 52 6.5 DU/GA 54 7.0 DU/GA 56 PUD's, condos, apartments, " %impervious cc~x~ercial businesses & must be industrial areas :-~i computed (1) For a more detailed description of agricultural land use curve numbers refer to National Engineering Handbook,' Sec. 4, Hydrology, Chapter 9, August 1972. (2) Assumes roof and driveway runoff is directed into street/storm system. (3) The remaining pervious areas (lawn) are considered to be in good condition for these curve numbers. Iii-1-12 FEBRUARY, 1992 ZO- ;200- - Preconstruction Post Construction 6 mo Basin ID -- 6m Basin ID = 6m+ Ap = o,3,~ ON: ~(.,O Ap = O. $ O ON= /~'~, ?-~ Ai: -~- CN= '=t~ Ai = O, oz-lr CN= ~ ~,r.=, ~l Rain = O. c~ Rain = Tnp= IG.'-r¢~ Tnp= 12 Tni = .¢~ Tni = 0. RS 2 yr Basin ID = 2y Basin ID = 2y+ Ap = O.'3'I- ON= (~, 0 Ap = O. ~o CN= Ai = o CN= ~ Ai = O, O z_~ CN= 7 -~Z.- Rain = i, $ Rain = 1 ~ ~ Trip = Tnp= Tni = Tni = 10 yr Basin ID = 10y Basin ID = 10y+ Ap = O,3~r CN=~;,0 Ap = O.~o CN= Ai= ~ CN= 9~' Ai= O,O~ CN= ~-._% Rain = Z,25 Rain = ~. 2._% Tnp = Trip = Tni = Tni = _ 25 yr Basin ID = 25y Basin ID = 25y+ Ap = O.%d- CN=~,(~,O Ap = CD, ~o CN= Ai= ~ CN= ~ Ai= o,©ff CN= 4~z~ Rain = Z¢?S Rain = Tnp= Tnp= Tni = Tni = 100 yr Basin ID = 100y Basin ID = 100y+ Ap = O, '~ CN= ~,6,O Ap = O, :Zo CN= ~'/-{. Ai= ~' CN= 9~ Ai= O.o~ CN= ~'~ ~10 ~B Rain = ~','ZS Rain = ~j,)_ ~ Tnp = Trip = Tni = Tni = Other: Type lA Storm SBUH method - G:~GE~OB~Sto~ ~ble.~ RIB(~R/'[ ) '~i'URT / __ _ . 2s SEAT 5~ TACOMA 3 1 \ i'F, IDAY HARBOR ~ /,~PORI' ,~', rv / ZZ. i t,. / ~ ~,~ / U~'E R [: T / 50~t ? 1 / 40'L ~ 35~ \ 25 ' · CEN~ STORMWATER MANAGEMENT MANUAL FOR THE PUGET SOUND BASIN Table III-1.3 SCS Western Washington Runoff Curve Numbers (Published by SCS in 1982) Runoff curve numbers for selected agricultural, suburban and urban land use for Type lA rainfall distribution, 24-hour storm duration. LAND USE DESCRIPTION CURVE NUMBERS BY HYDROLOGIC SOIL GROUP A B C D Cultivated land(l): -winter condition 86 91 94 95 Mountain open areas: low growing brush & grasslands 74 82 89 92 Meadow or pasture: 65 78 85 89 Wood or forest land: undisturbed 42 64 76 81 Wood or forest land: young second growth or brush 55 72 81 86 Orchard: with cover cro~ 81 88 92 94 Open spaces, lawns, parks, golf courses, cemeteries, landscaping. Good condition: grass cover on k75% of the 68 80 86 90 area Fair condition: grass cover on 50-75% of 77 85 90 92 the area Gravel roads & parking lots: 76 85 89 91 Dirt roads & parkin~ lots: 72 82 87 89 Impervious surfaces, pavement, roofs etc. 98 98 98 98 open water bodies: -lakes, wetlands, ponds etc. 100 100 100 100 Single family residential(2): Dwelling Unit/Gross Acre %Impervious(3) Separate curve number 1.0 DU/GA 15 shall be selected for 1.5 DU/GA 20 pervious & impervious 2.0 DU/GA 25 portions of the site 2.5 DU/GA 30 or basin 3.0 DU/GA 34 3.5 DU/GA 38 4.0 DU/GA 42 4.5 DU/GA 46 5.0 DU/GA 48 5.5 DU/GA 50 ... 6.0 DU/GA 52 ~ 6.5 DU/GA 54 7.0 DU/GA 56 PUD's, condos, apartments, %impervious commercial businesses & . must be industrial areas %~ computed (1) For a more detailed description of agricultural land use curve numbers refer to National Engineering Handbook,' Sec. 4, Hydrology, Chapter 9, August 1972. (2) Assumes roof and driveway runoff is directed into street/storm system. (3) The remaining pervious areas (lawn) are considered to be in good condition for these curve numbers. ~ Iii-l-12 FEBRUA3~Y, 1992 HYDROLOGIC SIMULATION _ ~ Fi~. I.~ :'~ Pro': HALVER2 le Disch Peak Peak Peak ID- 'Stage Volume Out . -dl .loo."~4.... lo o.o~ -" dl'~:~o~.o0~-~ ' 24 O.O1 lO0 yr pre-- dl 102.99 72 0.02 " ~ ' :.7 ' ' ,:...~. ' "; - "-. Jll~]ili1'1 -l~ I xl -- : HALVER2 ): Enter.~$hor.,1;.~:20 character.;;descr~ption m ,'i[~t lar LPool - - HALVER2 p: Enter'-'8 char storage ID ~ -2nd orific~i;.D~fsm~,/~:;- Dist to--n~ext orif-: - 3rd orifice,' Diam...: Stage Disch':Z-'~crem: ',f-t Dist to next Orif: _ ':.~i;:;]~;i:!i(~:_' 4th Orifice Diam.. · - -:4~;4:-. ~-:~- ' : : Di st to .next oki' -" Top orif]ce.D~am,..: , ~-' ;:-_; : _ ' HALVER2 Menu' Display summary~table of hydrograph values 9/30/02 8:58:12 am Shareware Release page 1 Tom Halverson Home Trails End, Div 4, Blk 2, Lots 3 & 4 Jefferson Co. - Sec 16, Twn 27N Rg 1E WM BASIN SUMMARY BASIN ID: 100y NAME: 100 yr pre construction SBUIq METHODOLOGY TOTAL AREA ....... : 0.34 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE .... : TYPE1A PERV IMP PRECIPITATION .... : 3.25 inches AREA..: 0.34 Acres 0.00 Acres TIME INTERVAL .... : 10.00 min CN .... : 66.00 98.00 TC .... : 16.74 min 0.00 min ABSTRACTION COEFF: 0.20 TcReach - Sheet L: 170.00 ns:0.2400 p2yr: 1.50 s:0.1000 PEAK RATE: 0.02 cfs VOL: 0.02 Ac-ft TIME: 490 min BASIN ID: 100y+ NAME: 100 yr post construction SBUH METHODOLOGY TOTAL AREA ....... : 0.34 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE .... : TYPE1A PERV IMP PRECIPITATION .... : 3.25 inches AREA..: 0.30 Acres 0.04 Acres TIME INTERVAL .... : 10.00 min CN .... : 64.75 98.00 TC .... : 12.67 min 0.46 min ABSTP~ACTION COEFF: 0.20 TcReach - Sheet L: 120.00 ns:0.2400 p2yr: 1.50 s:0.1000 impTcReach - Sheet L: 20.00 ns:0.0110 p2yr: 1.50 s:0.2500 -- impTcReach Channel L: 100.00 kc:42.00 s:0.0200 PEAK RATE: 0.04 cfs VOL: 0.03 Ac-ft TIME: 480 min BASIN ID: !0y NAME: 10 yr pre construction SBUH METHODOLOGY TOTAL AREA ....... : 0.34 Acres BASEFLOWS: 0.00 cfs P~AINFALL TYPE .... : TYPE1A PERV IMP PRECIPITATION .... : 2.25 inches AREA..: 0.34 Acres 0.00 Acres TIME INTERVAL .... : 10.00 min CN .... : 66.00 98.00 TC .... : 16.74 min 0.00 min ABSTRACTION COEFF: 0.20 TcReach - Sheet L: 170.00 ns:0.2400 p2yr: 1.50 s:0.1000 PEAK RATE: 0.01 cfs VOL: 0.01 Ac-ft TIME: 960 min 9/30/02 8:58:12 am Shareware Release page 2 Tom Halverson Home -- Trails End, Div 4, Blk 2, Lots 3 & 4 Jefferson Co. - Sec 16, Twn 27N Rg 1E WM BASIN SUMMARY BASIN ID: 10y~ NAME: 10 yr post construction SBUH METHODOLOGY TOTAL AREA ....... : 0.34 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE .... : TYPE1A PERV IMP PRECIPITATION .... : 2.25 inches AREA..: 0.30 Acres 0.04 Acres TIME INTERVAL .... : 10.00 min CN .... : 64.75 98.00 TC .... : 12.67 min 0.46 min ABSTRACTION COEFF: 0.20 TcReach - Sheet L: 120.00 ns:0.2400 p2yr: 1.50 s:0.1000 impTcReach - Sheet L: 20.00 ns:0.0110 p2yr: 1.50 s:0.2500 impTcReach - Channel L: 100.00 kc:42.00 s:0.0200 PEAK RATE: 0.02 cfs VOL: 0.01 Ac-ft TIME: 470 min BASIN ID: 25y NAME: 25 yr pre construction SBUH METHODOLOGY TOTAL AREA ....... : 0.34 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE .... : TYPE1A PERV iMP PRECIPITATION .... : 2.75 inches AREA..: 0.34 Acres 0.00 Acres TIME INTERVAL,....: 10.00 min CN .... : 66.00 98.00 TC .... : 16.74 min 0.00 min -- ABSTRACTION COEFF: 0.20 TcReach - Sheet L: 170.00 ns:0.2400 p2yr: 1.50 s:0.1000 PEAK RATE: 0.01 cfs VOL: 0.01 Ac-ft TIME: 960 min BASIN ID: 25y+ NAME: 25 yr post construction SBUH METHODOLOGY TOTAL AREA ....... : 0.34 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE .... : TYPE1A PERV IMP PRECIPITATION .... : 2.75 inches AREA..: 0.30 Acres 0.04 Acres TIME INTERVAL .... : 10.00 min CN .... : 64.75 98.00 TC .... : 12.67 min 0.46 min ABSTRACTION COEFF: 0.20 TcReach - Sheet L: 120.00 ns:0.2400 p2yr: 1.50 s:0.1000 impTcReach - Sheet L: 20.00 ns:0.0110 p2yr: 1.50 s:0.2500 impTcReach - Channel L: 100.00 kc:42.00 s:0.0200 PEAK RATE: 0.02 cfs VOL: 0.02 Ac-ft TIME: 480 min 9/30/02 8:58:12 am Shareware Release page 3 Tom Halverson Home Trails End, Div 4, Blk 2, Lots 3 & 4 Jefferson Co. - Sec 16, Twn 27N Rg 1E WM BASIN SUMMARY BASIN ID: 2y NAME: 2 yr pre construction SBU-H METHODOLOGY TOTAL AREA ....... : 0.34 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE .... : TYPE1A PERV IMP PRECIPITATION .... : 1.50 inches AREA..: 0.34 Acres 0.00 Acres TIME INTERVAL .... : 10.00 min CN .... : 66.00 98.00 TC .... : 16.74 min 0.00 min ABSTRACTION COEFF: 0.20 TcReach Sheet L: 170.00 ns:0.2400 p2yr: 1.50 s:0.1000 PEAK P~ATE: 0.00 cfs VOL: 0.00 Ac-ft TIME: 1320 min BASIN ID: 2y+ NAME: 2 yr post construction SBUH METHODOLOGY TOTAL AREA ....... : 0.34 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE .... : TYPE1A PERV IMP PRECIPITATION .... : 1.50 inches AREA..: 0.30 Acres 0.04 Acres TIME INTERVAL .... : 10.00 min CN .... : 64.75 98.00 TC .... : 12.67 min 0.46 ABSTRACTION COEFF: 0.20 TcReach - She%t L: 120.00 ns:0.2400 p2yr: 1.50 s:0.1000 impTcReach - Sheet L: 20.00 ns:0.0110 p2yr: 1.50 s:0.2500 impTcReach - Channel L: 100.00 kc:42.00 s:0.0200 PEAK RATE: 0.01 cfs VOL: 0.00 Ac-ft TIME: 470 min BASIN ID: 6m NAME: 6 mo pre construction SBUH METHODOLOGY TOTAL AREA ....... : 0.34 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE .... : TYPE1A PERV IMP PRECIPITATION .... : 0.90 inches AREA..: 0.34 Acres 0.00 Acres TIME INTERVAL .... : 10.00 min CN .... : 66.00 98.00 TC .... : 16.74 min 0.00 min ABSTRACTION COEFF: 0.20 TcReach Sheet L: 170.00 ns:0.2400 p2yr: 1.50 s:0.1000 PEAK RATE: 0.00 cfs VOL: 0.00 Ac-ft TIME: 0 min 9/30/02 8:58:12 am Shareware Release page 4 Tom Halverson Home -- Trails End, Div 4, Blk 2, Lots 3 & 4 Jefferson Co. - Sec 16, Twn 27N Rg 1E WM BASIN SUMMARY BASIN ID: 6m+ NAME: 6 mo post construction SBUH METHODOLOGY TOTAL AREA ....... : 0.34 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE .... : TYPE1A PERV IMP PRECIPITATION .... : 0.90 inches AREA..: 0.30 Acres 0.04 Acres TIME INTERVAL .... : 10.00 min CN .... : 64.75 98.00 TC .... : 12.67 min 0.46 min ABSTRACTION COEFF: 0.20 TcReach - Sheet L: 120.00 ns:0.2400 p2yr: 1.50 s:0.1000 impTcReach Sheet L: 20.00 ns:0.0110 p2yr: 1.50 s:0.2500 impTcReach Channel L: 100.00 kc:42.00 s:0.0200 PEAK RATE: D.01 cfs VOL: 0.00 Ac-ft TIME: 470 min 9/30/02 8:58:12 am Shareware Release page 5 Tom Halverson Home Trails End, Div 4, Blk 2, Lots 3 & 4 Jefferson Co. - Sec 16, Twn 27N Rg 1E WM HYDROGRAPH SUMMARY PEAK TIME VOLUME HYD RUNOFF OF OF Contrib NUM RATE PEAK HYDRO Area cfs min. cf[AcFt Acres 2 0.002 1320 48 cf 0 34 3 0 007 960 288 cf 0 34 4 0 011 960 531 cf 0 34 5 0 018 490 825 cf 0 34 6 0 007 470 101 cf 0 34 7 0 012 470 217 cf 0 34 8 0 019 470 516 cf 0 34 9 0 024 480 789 cf 0 34 10 0 038 480 1107 cf 0 34 11 0 008 500 217 cf 0 34 12 0 011 500 516 cf 0 34 13 0.0~1 560 1107 cf 0 34 9/30/02 8:58:15 am Shareware Release page 6 Tom Halverson Home _ Trails End, Div 4, Blk 2, Lots 3 & 4 Jefferson Co. - Sec 16, Twn 27N Rg 1E WM ROUTING REPORT TRAPEZOIDAL BASIN ID No. s2 Description: Ynfiltration trench Length: 8.00 ft. Width: 3.00 ft. Side Slope 1: 0 Side Slope 3: 0 Side Slope 2: 0 Side Slope 4: 0 Infiltration Rate: 6.00 min/inch MULTIPLE ORIFICE ID No. dl Description: Control Release Unit Outlet Elev: 103.00 Elev: 99.90 ft Orifice Diameter: 0.0117 in. ROUTING CURVE S.-AJE S TOPJ~GE OL~SFLOW O,20 STAGE STOP, GE OUTFLOW 0~20 STA3E STCP~.S E OUTFLOW f~- icl' [cfs] CfS min [ft] cf! :cfs~ cfs min 'fi cf Cfs cfs i00.00 0.0000 0.0000 0.0000 101.70 40.800 0.0142 0.1502 103.40 81.600 C.0229 i00.10 2.4000 0.0061 0.0141 101.80 43.200 0.0147 0.1587 103.50 84.000 0.0234 100.20 4.8000 0.0066 0.0226 101.90 45.600 0.0152 0.1672 103.60 86.400 0.0239 O 3119 10S.3C 7.2000 0.0071 0.0311 102.00 48.000 0.0157 0.1757 103.70 88.800 0.0244 ~i.4C 9.6000 0.0076 0.0396 102.10 50.400 0.0162 0.1842 103.80 91.200 ~ D249 - ill 51 12.000 1.008! 0.0481 102.20 52.~D0 0.016~ ~.!92~ 103.90 93.~2 ~.,~2~4 ~ ~2 4 iii 60 !4.400 [.0356 0.0566 102.30 55.290 0.0173 E.2313 104.03 96.00C C.0259 121.72 16. ~lC. 2. ?Dgl 3.C651 102.40 57.600 0.0178 C.2398 104.10 98.406 2 0,265 Z.354~ 121 ~2 -9.220 ~ 2296 _-.2736 102.50 60 330 C.0183 2.2183 10420 i00 80 £.0272 3 161{ _~-- 9i 2' 62- 2 2131 ~.C821 i02.6C 62 43C 5.2!~ 2.2268 104 33 153 2~ i C2~ iii ~i 24 31~ ~ SiC& 5.1906 102.70 &4 ~2C C 219~ 22353 104 40 !056:3 C C282 ..... 26.400 28112 C.0992 102.89 6~.200 0.~!9~ -.243~ 104 52 108.32 S 02~5 ' ~' 2C 28.800 3.0i17 0.!077 !02.9D 69.600 0 0203 $.2523 104 60 110.40 0.0290 2 397~ - -- 3~ 31.20~ 0.0122 0.1162 103.00 72.000 0.0208 2.2608 104 70 112.80 2 0295 i$1.40 33.600 0.0127 0.1247 103.10 74.400 0.0214 0.2694 i04 80 ii5.20 0.0300 0 4141 101.50 36.000 0.0132 0.1332 103.20 76.800 0.0219 0.2779 104 90 117.60 0.0305 C 4225 iPl.60 38.400 0.0137 0.1417 103.30 79.200 0.0224 0.2864 9/30/02 8:58:15 am Shareware Release page 7 Tom Halverson Home Trails End, Div 4, Blk 2, Lots 3 & 4 Jefferson Co. Sec 16, Twn 27N Rg 1E WM LEVEL POOL ROUTING TABLE 2 yr pre MATCH Q (cfs) : 0.00 INFLOW Q (cfs): 0.01 PEAK STAGE (f~) : 100.44 PEAK OUTFLOW : 0.01 PEAK TIME: 500.00 min. INFLOW HYD No. : 7 OUTFLOW HYD No. : 11 LEVEL POOL ROUTING TABLE I1 I2 2S1 SUM O1 O2+2S2 STAGE TIME < ...................... cfs rain ..................... > (ft) (rain) 0 0000 0.0000 0 0000 0.0000 0 0000 0 0000 100 O0 80 O© 0 0000 0 0001 0 0000 0 0002 0 0000 0 0001 100 O0 90 OO 0 0001 0 0002 0 0001 0 0005 0 0001 0 0004 100 10 100 00 0 0002 0 0003 0 0002 0 0008 0 0002 0 0006 100 10 110 00 0 0003 0 0004 0 0004 0 0011 0 0003 0 0009 100 10 120 00 0 0004 0 0006 0 0005 0 0015 0 0004 0 0012 100 10 130 O© 0 0006 0 0007 0 0007 0 0020 0 0005 0 0015 100 10 la_{ 0'3 0 0007 0 0008 0 0008 0 0024 0 0006 0 0017 100 10 153 0 0008 0 0009 0 0010 0 0027 0 0007 0 0019 100 i0 160 0 0009 0 0010 0 0011 0 0030 0 0008 0 0021 100 10 170 00 0 0010 0 OOlb 0 0012 0 0032 0 0009 0 0023 100 10 180 oo 0 0010 0 0011 0 0013 0 0034 0 0010 0 0024 100 10 190 0 0 0011 0 0012 0 0014 0 0037 0 0011 0 0026 100 10 200 OC 0 0012 0 0012 0 0015 0 0039 0 0011 0 0027 100 10 210 O0 0 0012 0 0013 0 0016 0 0040 0 0012 0 0028 100 10 220 O0 0 0013 0 0013 0 0016 0 0042 0 0012 0 0030 100 10 230 0 0013 0 0013 0 0017 0 0043 0 0013 0 0031 100 10 240 0 0013 0 0016 0 0017 0 0047 0 0013 0 0033 100 10 250 O0 0 0016 0 0016 0 0019 0 0051 0 0014 0 0037 100 10 260 O0 0 0016 0 0017 0 0021 0 0054 0 0016 0 0038 100 10 270 O0 0 0017 0 0017 0 0022 0 0056 0 0016 0 0039 100 10 280 O0 0 0017 0 0017 0 0022 0 0057 0 0017 0 0040 100 10 290 O0 0 0017 0 0018 0 0023 0 0058 0 0017 0 0041 100 10 300 O0 0 0018 0 0027 0 0023 0 0068 0 0018 0 0050 100 10 310 O0 0 0027 0 0029 0 0028 0 0084 0 0022 0 0062 100 10 320 O0 0 0029 0 0028 0 0035 0 0092 0 0027 0 0065 100 10 330 O0 0 0028 0 0029 0 0037 0 0094 0 0028 0 0066 100 10 340 O0 0 0029 0 0029 0 0038 0 0096 0 0029 0 0068 100 10 350 O0 . 0 0029 0 0030 0 0038 0 0098 0 0029 0 0069 100 10 360 O0 0 0030 0 0028 0 0039 0 0097 0 0030 0 0067 100 10 370 O0 0 0028 0 0028 0 0038 0 0094 0 0029 0 0065 100 10 380 O0 0 0028 0 0028 0 0037 0 0093 0 0028 0 0065 100 10 390 O0 0 0028 0 0029 0 0037 0 0094 0 0028 0 0066 100 10 400 O0 0 0029 0 0029 0 0037 0 0095 0 0028 0 0067 100 10 410 O0 0 0029 0 0029 0 0038 0 0096 0 0029 0 0067 100 10 420 O0 0 0029 0 0061 0 0038 0 0128 0 0029 0 0099 100 10 430 O0 0 0061 0 0067 0 0056 0 0184 0 0043 0 0142 100 10 440 O0 0 0067 0 0063 0 0081 0 0212 0 0061 0 0151 100 10 450 O0 0 0063 0 0113 0 0090 0 0266 0 0061 0 0205 100 11 460 O0 0 0113 0 0119 0 0141 0 0374 0 0065 0 0309 100 18 470 O0 9/30/02 8:58:15 am Shareware Release page 8 Tom Halverson Home Trails End, Div 4, Blk 2, Lots 3 & 4 Jefferson Co. Sec 16, Twn 27N Rg 1E WM LEVEL POOL ROUTING TABLE LEVEL POOL ROUTING TA~BLE I1 I2 2S1 SUM O1 O2+2S2 STAGE TIME < ...................... cfs min ..................... > (ft) (min) 0 0119 0 0117 0 0238 0.0475 0 0071 0 0404 100 30 480.00 0 0117 0 0058 0 0328 0 0503 0 0076 0 0427 100 41 490.00 0 0058 0 0045 0 0349 0 0452 0 0078 0 0375 100 44 500.00 0 0045 0 0056 0 0300 0 0402 0 0075 0 0327 100 38 510 00 0 0056 0 0042 0 0255 0 0354 0 0072 0 0282 100 32 520 00 0 0042 0 0049 0 0213 0 0305 0 0069 0 0235 100 27 530 00 0 0049 0 0044 0 0169 0 0262 0 0066 0 0196 100 21 540 00 0 0044 0 0035 0 0132 0 0210 0 0064 0 0146 100 16 550 00 0 0035 0 0029 0 0085 0 0149 0 0061 0 0088 100 !! 560 O0 0 0029 0 0034 0 0050 0 0113 0 0038 0 0075 100 06 570 O0 0 0034 0 0030 0 0043 0 0107 0 0032 0 0075 100 10 580 O0 0 0030 0 0033 0 0042 0 0106 0 0032 0 0074 100 !0 590 O0 0 0033 0 0031 0 0042 0 0106 0 0032 0 0074 100 10 600 O0 0 0031 0 0030 0 0042 0 0103 0 0032 0 0071 100 !0 610 O0 0 0030 0 0028 0 0041 0 0099 0 0031 0 0068 100 10 620 O0 0 0028 0 0030 0 0039 0 0097 0 0029 0 0068 100 10 630 O0 0 0030 0 0028 0 0038 0 0097 0 0029 0 0068 100 10 640 OO -- 0 0028 0 0030 0 0038 0 0097 0 0029 0 0068 100 10 650 O0 0 0030 0 0029 0 0038 0 0097 0 0029 0 0068 100 !0 660 O0 0 0029 0 0024 0 0039 0 0092 0 0029 0 0062 100 !0 670 O0 0 0024 0 0022 0 0035 0 0082 0 0027 0 0055 100 !0 680 O0 0 0022 0 0024 0 0032 0 0078 0 0024 0 0054 100 10 690 O0 0 0024 0 0023 0 0031 0 0078 0 0023 0 0055 100 10 700 O0 0 0023 0 0024 0 0031 0 0078 0 0024 0 0054 100 10 710 O0 0 0024 0 0023 0 0031 0 0078 0 0023 0 0054 100 10 720 O0 0 0023 0 0024 0 0031 0 0078 0 0023 0 0055 100 10 730 O0 0 0024 0 0023 0 0031 0 0078 0 0024 0 0054 100 10 740 O0 0 0023 0 0024 0 0031 0 0078 0 0023 0 0054 100 I0 750 O0 0 0024 0 0023 0 0031 0 0078 0 0023 0 0055 100 10 760 O0 0 0023 0 0023 0 0031 0 0078 0 0024 0 0054 100 10 770 O0 0 0023 0 0023 0 0031 0 0078 0 0023 0 0054 100 10 780 O0 0 0023 0 0018 0 0031 0 0073 0 0023 0 0049 100 10 790 O0 0 0018 0 0017 0 0028 0 0063 0 0021 0 0042 100 10 800 O0 0 0017 0 0018 0 0024 0 0059 0 0018 0 0041 100 10 810 O0 0 0018 0 0017 0 0023 0 0059 0 0018 0 0041 100 10 820 O0 0 0017 0 001~ 0 0023 0 0059 0 0018 0 0041 100 10 830 O0 0 0018 0 0018 0 0023 0 0059 0 0018 0 0042 100 10 840 O0 0 0018 0 0021 0 0024 0 0063 0 0018 0 0045 100 10 850 O0 0 0021 0 0022 0 0026 0 0069 0 0019 0 0050 100 10 860 O0 0 0022 0 0022 0 0028 0 0073 0 0021 0 0052 100 10 870 O0 0 0022 0 0023 0 0029 0 0075 0 0022 0 0052 100 10 880 O0 0 0023 0 0024 0 0030 0 0076 0 0023 0 0054 100 10 890 O0 0 0024 0 0024 0 0031 0 0078 0 0023 0 0055 100 10 900 O0 -- 0 0024 0 0024 0 0031 0 0080 0 0024 0 0056 100 10 910 O0 0 0024 0 0025 0 0032 0 0081 0 0024 0 0057 100 10 920 O0 0 0025 0 0025 0 0033 0 0083 0 0025 0 0059 100 10 930 O0 9/30/02 8:58:15 am Shareware Release page 9 Tom Halverson Home Trails End, Div 4, Blk 2, Lots 3 & 4 Jefferson Co. Sec 16, Twn 27N Rg 1E WM LEVEL POOL ROUTING TABLE LEVEL POOL ROUTING TABLE I1 I2 2S1 SUM O1 O2+2S2 STAGE TIME < ...................... cfs min ..................... > (ft) (min) 0 0025 0 002~ 0 0033 0.0085 0 0025 0.0059 100 10 940 00 0 0026 0 0027 0 0034 0 0086 0 0026 0.0061 100 10 950 00 0 0027 0 0027 0 0035 0 0088 0 0026 0.0062 100 10 960 00 0 0027 0 0018 0 0035 0 0080 0 0027 0 0054 100 10 970 00 0 0018 0 0016 0 0031 0 0065 0 0023 0 0042 100 10 980 00 0 0016 0 0017 0 0024 0 0057 0 0018 0 0039 100 10 990 00 0 0017 0 0016 0 0022 0 0055 0 0017 0 0038 100 10 1000 00 0 0016 0 0017 0 0022 0 0055 0 0016 0 0038 100 10 1010 00 0 0017 0 0016 0 0022 0 0055 0 0016 0 0039 100 10 1020 00 0 0016 0 0023 0 0022 0 0061 0 0017 0 0045 100 t0 1030 00 0 0023 0 0025 0 0025 0 0073 0 0019 0 0054 100 10 1040 00 0.'0025 0 0025 0 0031 0 0081 0 0023 0 0058 100 10 1050 00 0 0025 0 0026 0 0033 0 0084 0 0025 0 0059 t00 10 1060 00 0 0026 0 0026 0 0034 0 0086 0 0026 0 0060 100 !0 4070 00 0 0026 0 0027 0 0034 0 0087 0 0026 0 0061 100 I0 1080 O0 0 0027 0 0024 0 0035 0 0086 0 0026 0 0059 100 10 1090 00 0 0024 0 0023 0 0034 0 0080 0 0026 0 0055 100 10 !100 O0 -- 0 0023 0 0023 0 0031 0 0078 0 0024 0 0054 100 10 1110 00 0 0023 0 003~ 0 0031 0 0089 0 0023 0 0066 100 10 1120 0© 0 0035 0 0016 0 0037 0 0089 0 0028 0 0060 100 10 1130 O0 0 0016 0 0019 0 0034 0 0070 0 0026 0 0044 100 10 1140 O0 0 0019 0 0026 0 0025 0 0070 0 0019 0 0051 100 10 1150 O0 0 0026 0 0022 0 0029 0 0077 0 0022 0 0055 100 10 1160 O0 0 0022 0 0026 0 0031 0 0079 0 0024 0 0055 100 10 1170 O0 0 0026 0 0023 0 0031 0 0081 0 0024 0 0057 100 10 1180 O0 0 0023 0 0026 0 0032 0 0082 0 0025 0 0057 100 10 1190 O0 0 0026 0 0024 0 0032 0 0083 0 0025 0 0058 100 10 1200 O0 0 0024 0 0026 0 0033 0 0084 0 0025 0 0059 100 10 1210 O0 0 0026 0 0025 0 0033 0 0084 0 0025 0 0059 100 10 1220 O0 0 0025 0 0026 0 0034 0 0085 0 0025 0 0059 100 10 1230 O0 0 0026 0 0026 0 0034 0 0086 0 0026 0 0060 100 10 1240 O0 0 0026 0 0026 0 0034 0 0087 0 0026 0 0060 100 10 1250 O0 0 0026 0 0026 0 0034 0 0087 0 0026 0 0061 100 10 1260 O0 0 0026 0 0027 0 0035 0 0088 0 0026 0 0062 100 10 1270 O0 0 0027 0 0026 0 0035 0 0089 0 0027 0 0062 100 10 1280 O0 0 0026 0 0027 0 0035 0 0089 0 0027 0 0062 100 10 1290 O0 0 0027 0 0027 0 0036 0 0090 0 0027 0 0063 100 10 1300 O0 0 0027 0 0027 0 0036 0 0091 0 0027 0 0064 100 10 1310 O0 0 0027 0 0028 0 0036 0 0091 0 0027 0 0064 100 10 1320 O0 0 0028 0 0025 0 0036 0 0089 0 0028 0 0061 100 10 1330 O0 0 0025 0 0023 0 0035 0 0083 0 0026 0 0056 100 10 1340 O0 0 0023 0 0023 0 0032 0 0079 0 0024 0 0054 100 10 1350 O0 0 0023 0 0023 0 0031 0 0077 0 0023 0 0053 100 10 1360 O0 0 0023 0 0024 0 0030 0 0077 0 0023 0 0053 100 10 1370 O0 0 0024 0 0023 0 0030 0 0077 0 0023 0 0054 100 10 1380 O0 0 0023 0 0023 0 0031 0 0077 0 0023 0 0054 100 10 1390 O0 9/30/02 8:58:15 am Shareware Release page 10 Tom Halverson Home Trails End, Div 4, Blk 2, Lots 3 & 4 _ Jefferson Co. Sec 16, Twn 27N Rg 1E WM LEVEL POOL ROUTING TABLE LEVEL POOL ROUTING TABLE I1 I2 2S1 SLIM O1 O2+2S2 STAGE TIME < ...................... cfs min ..................... > (ft) (min) 0 0023 0 0024 0 0031 0.0077 0 0023 0 0054 100 10 1400 00 0 0024 0 002~ 0 0031 0 0078 0 0023 0 0055 100 10 1410 00 0 0024 0 0023 0 0031 0 0078 0 0024 0 0055 100 10 1420 00 0 0023 0 0024 0 0031 0 0079 0 0024 0 0055 100 10 1430 00 0 0024 0 0024 0 0031 0 0079 0 0024 0 0056 100 10 1440 00 0 0024 0 0010 0 0032 0 0065 0 0024 0 0041 100 10 1450 00 0 0010 0 0003 0 0023 0 0036 0 0018 0 0018 100 10 1460 00 0 0003 0 0002 0 0010 0 0016 0 0008 0 0008 100 10 1470 00 0 0002 0 0000 0 0004 0 0007 0 0003 0 0004 100 10 1480 00 0 0000 0 0001 0 0002 0 0003 0 0002 0 0001 100 10 1490 00 0 0001 0 0000 0 0001 0 0002 0 0001 0 0001 100 10 1500 0 0000 0 0000 0 0001 0 0001 0 0000 0 0001 100 10 1510 00 0 0000 0 0000 0 0000 0 0001 0 0000 0 0000 100 10 1520 00 0 0000 0 0000 0 0000 0 0001 0 0000 0 0000 100 10 1530 00 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1540 00 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1550 00 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1560 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1570 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 lO 1580 O0 0 0000 0 O00b 0 0000 0 0000 0 0000 0 0000 100 i0 1590 O0 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1600 O0 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1610 O0 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 t0 1620 O0 O 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1630 O0 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1640 O0 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1650 00 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1660 O0 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1670 O0 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1680 O0 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1690 O0 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1700 O0 9/30/02 8:58:15 am Shareware Release page 11 Tom Halverson Home _ Trails End, Div 4, Blk 2, Lots 3 & 4 Jefferson Co. - Sec 16, Twn 27N Rg 1E WM ROUTING REPORT TP_APEZOIDAL BASIN ID No. s2 Description: Infiltration trench Length: 8.00 ft. Width: 3.00 ft. Side Slope 1: 0 Side Slope 3: 0 Side Slope 2: 0 Side Slope 4: 0 Infiltration Rate: 6.00 min/inch MULTIPLE ORIFICE ID No. dl Description: Control Release Unit Outlet Elev: 103.00 Eiev: 99.90 ft Orifice Diameter: 0.0117 in. ROUTING CURVE STALE SiS 9_AGE 3UTFLGW 0-28 STAGE ST;SF~AGE OUTFLS~W C*2S STALE STOP~AG£ C'fTFLC;'; 3-28 f~ cf ufs cf$ sln f~ Cf cf$ ~f$ Tin f~ sf Cf$ Els rlF. ' -- 3~ A.1000 0.0082 3.02,10 101.70 48.800 0 0142 0.1522 103 48 81 621 i :2229 * 2949 132.1,2 2.4000 0.0061 0.0141 101.80 43.200 0.0147 6.1587 103.50 84 0Si [.2234 - 1134 100.20 4.8000 0.0066 0.0226 101.90 45.600 0.0152 0.!672 103.60 86.48[ 0.0239 ' 3119 100.30 7.2000 0.0071 0.0311 102.00 48.000 0.0157 0.1757 103.70 88 80: 2.2244 - 5214 _$3.40 9.6000 0.0076 0.0396 102.10 50.400 0.0162 0.1842 103.80 91.20~ ~.3249 -23'.5C 12.000 C,. 0~081 0.0481 102.20 52.800 0.0168 0.1928 !03.9~ 93611 2.2~E4 i .33-4 .00.6~ 14.400 0.0086 0.0586 102.30 55.200 0.0173 0.2013 104.03 96 3.i{ C.0259 i 34~9 ~8~.70 16.800 0.0091 0.0651 102.40 57.600 0.0178 0.2098 104.10 98.423 2.0265 ~ .1-~4 ~,~.80 19.200 0.0096 0.0736 102.50 60.000 0.0183 0.2183 104.20 10'2.80 0.0270 _Z2.98 2i.600 0.0i01 0.0821 102.60 62.400 0.0188 0.2268 104.30 103.20 0.0275 ~2.3715 _~i ~3 24.000 0.0106 0.0906 102.70 64.800 0.0193 0.2353 104.40 105.60 0.0280 Z.38C0 iii.ii. 26 400 0.0112 0.0992 102.80 67.200 0.0198 0.2438 104.50 108.00 0.0285 '~' 2' 2~.800 £ C!17 3.1077 102.90 69.600 0.0203 0.2523 104.60 110.40 0.0290 C 397i _l. 51 5 200 ~ 2122 2 1162 1~3 O] ~2 221 '2 3236 } 260B 104.70 '12 62 2.0295 11142 3i.59=3 { i12~ 5 124~ i{3 iC 74 46~ 0.2214 - 2694 13482 11-1.21 22321 i 4141 i£i.~6 36008 2 8132 2 1332 103.20 76 82[ 8.8219 -.2779 124.98 -'- 61 1.331~ i 421r i~' 66; 38.400 00137 2.1417 103.30 79.202 0.0224 8.2864 9/30/02 8:58:15 am Shareware Release page 12 Tom Halverson Home Trails End, Div 4, Blk 2, Lots 3 & 4 Jefferson Co. - Sec 16, Twn 27N Rg 1E WM LEVEL POOL ROUTING TABLE 10 yr pre MATCH Q (cfs) : 0.01 INFLOW Q (cfs) : 0.02 PEAK STAGE (ft) : 101.00 PEAK OUTFLOW : 0.01 PEAK TIME: 500.00 min. INFLOW HYD No. : 8 OUTFLOW HYD No.: 12 LEVEL POOL RO~TING TABLE I1 I2 2S1 SUM O1 O2+2S2 STAGE TIME < ...................... cfs rain ..................... > (ft) (rain) 0.0000 0.0000 0 0000 0.0000 0 0000 0 0000 t00 O0 60 O0 0.0000 0.0002 0 0000 0.0003 0 0000 0 0002 100 O0 70 O0 0.0002 0.0005 0 0001 0.0008 0 0001 0 0007 100 10 80 O0 0.0005 0 0007 0 0004 0 0016 0 0003 0 0013 i00 10 90 O0 0.0007 0 0009 0 0007 0 0023 0 0005 0 0017 100 10 I00 O0 0 0009 0 0010 0 0010 0 0029 0 0007 0 0021 100 10 ii0 O0 0 00i0 0 0012 0 0012 0 0034 0 0009 0 0025 100 10 120 O0 0 0012 0 0015 0 0014 0 0041 0 0011 0 0030 100 10 130 O0 0 0015 0 0017 0 0017 0 0049 0 0013 0 0036 100 10 140 O0 0 0017 0 0018 0 0020 0 0055 0 0015 0 0039 100 !0 150 O0 0 0018 0 0019 0 0022 0 0059 0 0017 0 0042 100 10 160.00 0 0019 0 0020 0 0024 0 0063 0 0018 0 0045 !OC i0 17~ 0 0020 0 0021 0 0025 0 0066 0 0019 0 0047 100 I0 i~$ O0 0 0021 0 002~ 0 0027 0 0069 0 0020 0 0049 100 10 190 O0 0 0021 0 0023 0 0028 0 0072 0 0021 0 0051 100 10 200 O0 0 0023 0 0023 0 0029 0 0074 0 0022 0 0052 100 10 210 O0 0 0023 0 0023 0 0030 0 0076 0 0023 0 0053 100 10 220 O0 0 0023 0 0024 0 0030 0 0078 0 0023 0 0055 100 10 230 O0 0 0024 0 0024 0 0031 0 0080 0 0024 0 0056 100 10 240 O0 0 0024 0 0028 0 0032 0 0085 0 0024 0 0060 100 10 250 O0 0 0028 0 0029 0 0034 0 0092 0 0026 0 0066 100 10 260 O0 0 0029 0 0029 0 0037 0 0096 0 0028 0 0067 100 10 270 O0 0 0029 0 0030 0 0038 0 0098 0 0029 0 0069 t00 10 280 O0 0 0030 0 0030 0 0039 0 0099 0 0030 0 0070 100 10 290 O0 0 0030 0 0031 0 0040 0 0100 0 0030 0 0070 100 10 300 O0 0 0031 0 0045 0 0040 0 0116 0 0030 0 0086 100 10 310 O0 0 0045 0 0048 0 0049 0 0142 0 0037 0 0105 100 10 320 O0 0 0048 0 0047 0 0060 0 0155 0 0045 0 0109 100 10 330 00 0 0047 0 0049 0 0062 0 0158 0 0047 0 0111 100 10 340 00 0 0049 0 0048 0 0063 0 0160 0 0048 0 0112 100 10 350 00 0 0048 0 0050 0 0064 0 0161 0 0048 0 0113 100 10 360 00 0 0050 0 004~ 0 0064 0 0159 0 0049 0 0110 100 10 370 00 0 0045 0 0046 0 0063 0 0154 0 0048 0 0106 100 10 380 00 0 0046 0 0045 0 0060 0 0152 0 0046 0 0106 100 10 390 0 0045 0 0046 0 0060 0 0152 0 0046 0 0106 100 10 400 0 0046 0 0046 0 0060 0 0153 0 0046 0 0107 100 10 410 00 0 0046 0 0046 0 0061 0 0153 0 0046 0 0107 100 10 420 00 0 0046 0 0097 0 0061 0 0204 0 0046 0 0158 100 10 430 00 0 0097 0 0106 0 0096 0 0300 0 0062 0 0238 100 12 440 00 0 0106 0 0100 0 0172 0 0378 0 0066 0 0312 100 21 450 00 9/30/02 8:58:15 am Shareware Release page 13 Tom Halverson Home Trails End, Div 4, Blk 2, Lots 3 & 4 Jefferson Co. - Sec 16, Twn 27N Rg 1E WM LEVEL POOL ROUTING TABLE LEVEL POOL ROUTING TABLE I1 I2 2S1 SUM O1 O2+2S2 STAGE TIME < ...................... cfs min ..................... > (ft) (min) 0 0100 0 0178 0.0241 0.0519 0.0071 0 0448 100.30 460 00 0 0178 0 0186 0.0369 0 0733 0 0079 0 0654 100.46 470 00 0 0186 0 0181 0.0563 0 0931 0 0091 0 0839 100 70 480 00 0 0181 0 009D 0 0737 0 1008 0 0102 0 0906 100 92 490 00 0 0090 0 0070 0 0800 0 0960 0 0106 0 0853 101 00 500 00 0 0070 0 0087 0 0750 0 0907 0 0103 0 0804 100 94 510 00 0 0087 0 0066 0 0704 0 0857 0 0100 0 0756 100 88 520 00 0 0066 0 0080 0 0659 0 0805 0 0097 0 0707 100 82 530 00 0 0080 0 0076 0 0613 0 0768 0 0095 0 0674 100 77 540 00 0 0076 0 0066 0 0581 0 0723 0 0093 0 0630 100 73 550 00 0 0066 0 0058 0 0540 0 0664 0 0090 0 0574 100 68 560 00 0 0058 0 0068 0 0487 0 0614 0 0087 0 0527 100 6! 570 00 0 0068 0 0065 0 0444 0 0577 0 0084 0 0493 I00 55 580 Ot 0 0065 0 0072 0 0411 0 0548 0 0082 0 0466 t00 51 590 0 0072 0 0071 0 0386 0 0528 0 0080 0 0448 100 48 600 0 0071 0 0072 0 0369 0 0512 0 0079 0 0433 100 46 610 O0 0 0072 0 0070 0 0354 0 0496 0 0078 0 0418 t00 44 620.00 -- 0 0070 0 0074 0 0340 0 0484 0 0077 0 0407 100 43 630.00 0 0074 0 0073 0 0331 0 0478 0 0077 0 0402 100 4~ ~0~_ .~ 0 0073 0 0078 0 0325 0 0477 0 0076 0 0400 I00 4! 0 0078 0 0078 0 0324 0 0480 0 0076 0 0404 t00 4i 660 0 0078 0 007~ 0 0328 0 0477 0 0076 0 0400 100 41 670 0 0071 0 0067 0 0324 0 0462 0 0076 0 0386 100 41 680 O0 0 0067 0 0069 0 0310 0 0446 0 0075 0 0371 100 39 690 O0 0 0069 0 0069 0 0297 0 0434 0 0074 0 0360 100 37 700 O0 0 0069 0 0070 0 0286 0 0425 0 0074 0 0351 100 36 710 O0 0 0070 0 0071 0 0278 0 0419 0 0073 0 0346 100 35 720 O0 0 0071 0 0073 0 0273 0 0417 0 0073 0 0344 100 34 730 O0 0 0073 0 0073 0 0271 0 0417 0 0073 0 0344 100 34 740 O0 0 0073 0 0075 0 0271 0 0419 0 0073 0 0346 100 34 750 00 0 0075 0 0076 0 0273 0 0425 0 0073 0 0352 100 34 760 O0 0 0076 0 0077 0 0278 0 0431 0 0073 0 0358 100 35 770 O0 0 0077 0 0078 0 0284 0 0439 0 0074 0 0366 100 36 780 O0 0 0078 0 0068 0 0292 0 0438 0 0074 0 0364 100 36 790 O0 0 0068 0 0063 0 0290 0 0421 0 0074 0 0347 100 36 800 O0 0 0063 0 0063 0 0274 0 0400 0 0073 0 0327 100 34 810 O0 0 0063 0 0062 0 0255 0 0380 0 0072 0 0309 100 32 820 O0 0 0062 0 0063 0 0238 0 0363 0 0071 0 0292 100 30 830 O0 0 0063 0 0063 0 0222 0 0348 0 0070 0 0278 100 28 840 O0 0 0063 0 007~ 0 0209 0 0342 0 0069 0 0273 100 26 850 O0 0 0070 0 0074 0 0204 0 0348 0 0069 0 0279 100 26 860 O0 0 0074 0 0075 0 0210 0 0359 0 0069 0 0290 100 26 870 O0 0 0075 0 0076 0 0220 0 0371 0 0070 0 0302 100 28 880 O0 0 0076 0 0078 0 0231 0 0385 0 0070 0 0315 100 29 890 O0 0 0078 0 0078 0 0244 0 0400 0 0071 0 0329 100 30 900 O0 0.0078 0 0079 0 0257 0 0414 0 0072 0 0342 100 32 910 O0 9/30/02 8:58:15 am Shareware Release page 14 Tom Halverson Home Trails End, Div 4, Blk 2, Lots 3 & 4 Jefferson Co. - Sec 16, Twn 27N Rg 1E WM LEVEL POOL ROUTING TABLE LEVEL POOL ROUTING TABLE I1 I2 2S1 SUM O1 O2+2S2 STAGE TIME < ...................... cfs min ..................... > (ft) (min) 0 0079 0 0080 0 0269 0.0428 0 0073 0.0356 100.34 920.00 0 0080 0 0081 0 0282 0 0443 0 0074 0.0370 100 35 930.00 0 0081 0 0081 0 0295 0 0458 0 0074 0.0383 100 37 940.00 0 0081 0 0083 0 0308 0 0472 0 0075 0.0397 100 39 950.00 0 0083 0 008J 0 0321 0 0487 0 0076 0.0411 100 40 960 00 0 0083 0 0065 0 0334 0 0482 0 0077 0.0405 100 42 970 00 0 0065 0 0055 0 0329 0 0449 0 0076 0 0372 100 41 980 00 0 0055 0 0052 0 0298 0 0405 0 0074 0 0330 100 37 990 00 0 0052 0 0049 0 0258 0 0360 0 0072 0 0288 100 32 1000 00 0 0049 0 0051 0 0218 0 0318 0 0069 0 0249 100 27 !010 00 0 0051 0 0049 0 0182 0 0282 0 0067 0 0215 100 23 1020 00 0 0049 0 0063 0 0150 0 0262 0 0065 0 0197 100 19 1030 00 0 '0063 0 0071 0 0133 0 0266 0 0064 0 0202 100 17 1040 O0 0 0071 0 0073 0 0138 0 0281 0 0064 0 0217 100 17 1050 O0 0 0073 0 0075 0 0152 0 0300 0 0065 0 0235 100 19 1060 O0 0075 0 0076 0 0169 0 0320 0 0066 0 0254 100 21 1070 O0 0 0076 0 0077 0 0187 0 0340 0 0067 0 0273 100 23 1080 O0 -- 0 0077 0 0071 0 0204 0 0353 0 0069 0 0284 100 26 1090 O0 0 0071 0 0067 0 0215 0 0353 0 0069 0 0284 !00 27 !lOC O0 0 0067 0 0067 0 0215 0 0349 0 0069 0 0280 100 27 0 0067 0 0091 0 0211 0 0368 0 0069 0 0299 100 26 1120 O0 0 0091 0 0058 0 0229 0 0378 0 0070 0 0308 100 29 1130 O0 0 0058 0 0056 0 0237 0 0350 0 0071 0 0279 100 30 1140 00 0 0055 0 0068 0 0210 0 0333 0 0069 0 0264 100 26 1150 O0 0 0068 0 0063 0 0196 0 0327 0 0068 0 0259 100 25 1160 O0 0 0063 0 0070 0 0191 0 0324 0 0068 0 0256 100 24 1170 O0 0 0070 0 0066 0 0189 0 0325 0 0068 0 0257 100 24 1180 O0 0 0066 0 0070 0 0190 0 0326 0 0068 0 0258 100 24 1190 O0 0 0070 0 0067 0 0190 0 0328 0 0068 0 0260 100 24 1200 O0 0 0067 0 0071 0 0192 0 0331 0 0068 0 0263 100 24 1210 O0 0 0071 0 0068 0 0195 0 0334 0 0068 0 0266 100 24 1220 O0 0 0068 0 0071 0 0198 0 0337 0 0068 0 0269 100 25 1230 O0 0 0071 0 0070 0 0201 0 0342 0 0068 0 0274 100 25 1240 O0 0 0070 0 0071 0 0205 0 0346 0 0069 0 0277 100 26 1250 O0 0 0071 0 0071 0 0209 0 0350 0 0069 0 0281 100 26 1260 O0 0 0071 0 0072 0 0212 0 0355 0 0069 0 0286 100 27 1270 O0 0 0072 0 0071 0 0217 0 0360 0 0069 0 0291 100 27 1280 O0 0 0071 0 0073 0 0221 0 0365 0 0070 0 0295 100 28 1290 O0 0 0073 0 0073 0 0225 0 0371 0 0070 0 0301 100 28 1300 O0 0 0073 0 0073 0 0230 0 0376 0 0070 0 0306 100 29 1310 O0 0 0073 0 0072 0 0235 0 0381 0 0071 0 0310 100 29 1320 O0 0 0073 0 0067 0 0240 0 0379 0 0071 0 0308 100 30 1330 O0 0 0067 0 0062 0 0238 0 0366 0 0071 0 0296 100 30 1340 O0 0 0062 0 0061 0 0226 0 0349 0 0070 0 0279 100 28 1350 O0 0 0061 0 0059 0 0210 0 0331 0 0069 0 0262 100 26 1360 O0 0 0059 0 0061 0 0194 0 0314 0 0068 0 0246 100 24 1370 O0 9/30/02 8:58:16 am Shareware Release page 15 Tom Halverson Home Trails End, Div 4, Blk 2, Lots 3 & 4 _ Jefferson Co. - Sec 16, Twn 27N Rg 1E WM LEVEL POOL ROUTING TABLE LEVEL POOL ROUTING TABLE I1 I2 2S1 SUM O1 O2+2S2 STAGE TIME < ...................... cfs min ..................... > (f~) (min) 0 0061 0 0060 0 0179 0.0300 0 0067 0 0233 100 22 1380 00 0 0060 0 0060 0 0167 0 0287 0 0066 0 0221 100 21 1390 00 0 0060 0 0061 0 0155 0 0276 0 0065 0 0211 100 19 1400 00 0 0061 0 0061 0 0146 0 0267 0 0065 0 0202 100 18 1410 00 0 0061 0 006? 0 0138 0 0259 0 0064 0 0195 100 17 1420 00 0 0060 0 0062 0 0131 0 0253 0 0064 0 0189 100 16 1430 00 0 0062 0 0061 0 0126 0 0248 0 0064 0 0185 100 16 1440 00 0 0061 0 0033 0 0122 0 0215 0 0063 0 0152 100 15 1450 00 0 0033 0 0012 0 0091 0 0135 0 0061 0 0074 100 11 1460 00 0 0012 0 0007 0 0042 0 0061 0 0032 0 0029 100 05 1470 00 0 0007 0 0002 0 0017 0 0025 0 0013 0 0013 100 10 1480 00 0 0002 0 0002 0 0007 0 0011 0 0005 0 0005 100 10 1490 0O ~ ~2 O 000U 0 0003 0 0005 0 0002 0 0003 !00 10 520 2 0000 0 00Ct 0 0001 0 0002 0 0001 0 0001 100 i0 1519 00 0 000i 0 0000 0 000t 0 0001 0 0000 0 0001 100 10 -520 00 0 0000 0 0000 0 0000 0 0001 0 0000 0 0001 100 10 1530 00 0 0000 0 0000 0 0000 0 0001 0 0000 0 0000 100 10 1540 00 -- 0 0000 0 0000 0 0000 0 0001 0.0000 0 0000 100 10 !550 00 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 i00 10 ~56'2 0C 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 i00 !0 !5Ti.~21~ 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 !00 !0 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 !~9~ 00 0 0000 0 000p 0 0000 0 0000 0 0000 0 0000 100 10 !600 00 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1610 00 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1620 00 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1630 00 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1640 00 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1650 00 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 ~60 O0 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 t0 ~670 00 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1680 00 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1690 00 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1700 00 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1710 00 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1720 00 9/30/02 8:58:16 am Shareware Release page 16 Tom Halverson Home Trails End, Div 4, Blk 2, Lots 3 & 4 Jefferson Co. - Sec 16, Twn 27N Rg 1E WM ROUTING REPORT TP~APEZOIDAL BASIN ID No. s2 Description: Infiltration trench Length: 8.00 ft. Width: 3.00 ft. Side Slope 1: 0 Side Slope 3: 0 Side Slope 2: 0 Side Slope 4: 0 Infiltration Rate: 6.00 min/inch MULTIPLE ORIF$CE ID No. dl Description: Control Release Unit Outlet Elev: 103.00 Elev: 99.90 ft Orifice Diameter: 0.0117 in. ROUTING CURVE ~ ......... 0~2S STASE 0~2S - -~.== ~-. -.~.SE 1 i'7FLOW STORAGE OUTFLOW SiASE STORAGE OUTFLC W L~2S fl ..... .... = cfs mlX f~ cf ~-~=- ifs ~ln fl .... ~ ~ i~ i' 2 4il- - 116' i i141 -Si ~l 43.2{L i 214- i i~~ i12 91 84.003 S.1214 - 3134 '- 21 4 ~22] ~ 1266 - 1226 '~1.9} 45.63C ~.21~2 i 1672 113 6'i 86.4C0 3.1,239 ~.3119 ''31 7.2,Z31 ~ 1:271 2.0311 132.26 4~.000 8 i15~ 1.1757 103 73 88.800 C.0244 3214 ' -- 42 P.6Cii 1.3076 8.0396 132.10 50.400 0.2162 Z.1842 i13 ~3 91.203 {.2249 i_1.51 12.121 - {081 0.0481 102.20 52.880 3.0168 3.1928 ill 91 93.6C2, -.Z2~4 122.61 14.42,0 ~.0086 0.0566 102.30 55.200 0.C173 0.2013 i~4 01 96.00{ ~.2259 133.7C 16.800 0.0091 0.0651 102.40 57.600 0.0178 0.2098 104 'l 98.402, 2. 226~ 100.80 19.200 0.0096 0.0736 102.50 60.000 0.0183 0.2183 104 20 100.88 2.0271 _ 109.90 21.600 0.0~01 0.0821 102.60 62.400 0.0188 0.2268 104.30 103.20 0.0275 101.00 24.000 0.0106 0.0906 102.70 64.800 0.0193 0.2353 104.40 105.60 0.0255 - !502 i01.i0 26.400 0.0112 0.0992 102.80 67.200 0.0198 0.2438 104.50 108.00 0.02~5 i 3~5 101.20 28.800 0.0117 0.1077 102.90 69.600 0.0203 0.2523 104.60 110.40 0.0290 2.3970 i~1.30 3i.2~ 0.0122 0.1162 103.00 72.000 0.0208 0.2608 104.70 112.80 0.0295 1.4~55 iii 43 33.622 - 0127 0.1247 103.10 74.400 0.0214 0.2694 104.5~: 115.20 0.03i:T 2.414~ 111.51 36 ?13 i C132 0.1332 i}3.20 76.800 6.0219 2.2779 iZ4 9{ 117.68 3.332~ 422~ iii ~ 16 41- ~137 3 1417 113 30 79.2~2 C 3224 0.2~64 9/30/02 8:58:16 am Shareware Release page 17 Tom Halverson Home Trails End, Div 4, Blk 2, Lots 3 & 4 Jefferson Co. - Sec 16, Twn 27N Rg 1E WM LEVEL POOL ROUTING TABLE 100 yr pre MATCH Q (cfs) : 0.02 INFLOW Q (cfs) : 0.04 PEAK STAGE (ft) : 102.99 PEAK OUTFLOW : 0.02 PEAK TIME: 560.00 min. INFLOW HYD No. : 10 OUTFLOW HYD No.: 13 LEVEL POOL ROUTING TABLE I1 I2 201 SUM O1 O2+202 STAGE TIME < ...................... cfs min ..................... > (ft) (min) 0.0000 0.0000 0 0000 0.0000 0 0000 0 0000 100 O0 40 O0 0.0000 0.0002 0 0000 0.0002 0 0000 0 0002 100 00 50 00 0.0002 0 0004 0 0001 0 0007 0 0001 0 0006 100 10 60 00 0 0004 0 0010 0 0004 0 0017 0 0003 0 0015 100 10 70 00 0 0010 0 0014 0 0008 0 0031 0 0006 0 0025 100 !0 80 0 00TM 0 0016 0 0014 0 0044 0 001~ ~. ~ ~ 0 0034 i00 i0 ~, 02 O 0~ ~'~ 0 00i9_ 0 0019 0 0055 0 0014 0 0040 !00 i0 ~,~' ~ 0 0019 0 0021 0 0023 0 0063 0 0017 0 0046 I00 t0 !i0 O0 0 0021 0 0023 0 0026 0 0070 0 0020 0 0050 100 10 120 O0 0 0023 0 0028 0 0029 0 0080 0 0022 0 0058 i00 10 130 00 0 0028 0 0031 0 0033 0 0093 0 0025 0 0067 100 10 140 O0 0 0031 0 0032 0 0038 0 0101 0 0029 0 0072 100 10 150 O0 0 0032 0 0033 0 0041 0 0106 0 0031 0 0075 100 ~0 _~] ~O 92 0 0033 0 0035 0 0043 0 0111 0 0032 0 0078 100 i0 170 0 0035 0 0036 0 0045 0 0115 0 0034 0 0081 100 !0 180 03 0 0036 0 0036 0 0046 0 0118 0 0035 0 0083 100 10 19:3 00 0 0036 0 0038 0 0047 0 0121 0 0036 0 0085 100 10 200 00 0 0038 0 003~ 0 0048 0 0124 0 0037 0 0087 100 10 210 O0 0 0038 0 0038 0 0049 0 0125 0 0037 0 0088 100 t0 220 O0 0 0038 0 0039 0 0050 0 0127 0 0038 0 0090 100 10 230 O0 0 0039 0 0039 0 0051 0 0130 0 0039 0 0091 100 10 240 O0 0 0039 0 0045 0 0052 0 0136 0 0039 0 0097 100 10 250 O0 0 0045 0 0046 0 0055 0 0146 0 0042 0 0105 100 10 260 O0 0 0046 0 0046 0 0060 0 0152 0 0045 0 0107 100 10 270 O0 0 0046 0 0048 0 0061 0 0154 0 0046 0 0108 100 10 280 O0 0 0048 0 0046 0 0062 0 0156 0 0047 0 0109 100 10 290 O0 0 0046 0 0048 0 0062 0 0156 0 0047 0 0109 100 10 300 O0 0 0048 0 0070 0 0062 0 0180 0 0047 0 0133 100 10 310 O0 0 0070 0 0074 0 0076 0 0220 0 0057 0 0162 100 10 320 O0 0 0074 0 0072 0 0100 0 0246 0 0062 0 0184 100 13 330 O0 0 0072 0 0075 0 0121 0 0267 0 0063 0 0204 100 15 340 O0 0 0075 0 0073 0 0140 0 0287 0 0064 0 0223 100 17 350 O0 0 0073 0 0075 0 0157 0 0305 0 0066 0 0239 100 20 360 O0 0 0075 0 0068 0 0173 0 0316 0 0067 0 0250 100 22 370 O0 0 0068 0 0069 0 0183 0 0320 0 0067 0 0253 100 23 380 O0 0 0069 0 006~ 0 0185 0 0323 0 0067 0 0255 100 23 390 O0 0 0068 0 0069 0 0188 0 0325 0 0068 0 0258 100 23 400 O0 0 0069 0 0069 0 0190 0 0329 0 0068 0 0261 100 24 410 O0 0 0069 0 0069 0 0193 0 0331 0 0068 0 0264 100 24 420 O0 0 0069 0 0145 0 0196 0 0409 0 0068 0 0341 100 24 430 O0 9/30/02 8:58:16 am Shareware Release page 18 · Tom Halverson Home Trails End, Div 4, Blk 2, Lots 3 & 4 _ Jefferson Co. Sec 16, Twn 27N Rg 1E WM LEVEL POOL ROUTING TABLE LEVEL POOL ROUTING TABLE I1 I2 251 SUM O1 O2+252 STAGE TIME < ...................... cfs min ..................... > (ft) (min) 0 0145 0 0158 0 0269 0.0571 0 0073 0 0499 100 34 440 00 0 0158 0 0148 0 0417 0 0723 0 0082 0 0641 100 52 450 00 0 0148 0 0275 0 0550 0 0973 0 0091 0 0883 100 69 460 00 0 0275 0 0326 0 0778 0 1379 0 0105 0 1274 100 97 470 00 0 0326 0 0380 0 1145 0 1852 0 0128 0 1723 101 43 480 00 0 0380 0 0269 0 1568 0 2217 0 0155 0 2062 101 96 490 00 0 0269 0 0227 0 1886 0 2382 0 0176 0 2206 102 36~-n0 00 0 0227 0 025J 0 2022 0 2502 0 0184 0 2317 102 53 510 00 0 0253 0 0224 0 2127 0 2603 0 0191 0 2412 102 66 520 00 0 0224 0 0242 0 2216 0 2682 0 0197 0 2485 102 77 530 00 0 0242 0 0236 0 2284 0 2762 0 0201 0 2561 102 86 540 00 0 0236 0 0211 0 2356 0 2802 0 0206 0 2597 102 94 550 00 0 0211 0 0183 0 2389 0 2783 0 0208 0 2575 102 99 560 00 ,2 0183 0 0192 0 2369 0 2744 0 0206 0 2538 102 96 570 O0 0 '2~ 92 0 0184 0 2334 0 2710 0 0204 0 2506 102 92 580 00 0 8184 0 0193 0 2303 ~ 268~ u 0 0202 0 2479 102 8~ 0193 0 0191 0 2278 0 2663 0 0201 0 2462 102 85 0 0191 0 0191 0 2262 0 2644 0 0200 0 2444 102 83 618 0 0191 0 0185 0 2246 0 2621 0 0199 0 2422 102 81 620 O0 0 0185 0 0190 0 2225 0 2600 0 0197 0 2403 102 78 63'3 O0 0 0190 0 0188 0 2207 0 2584 0 0196 0 2388 102 76 640 O0 0 0188 0 0195 0 2193 0 2576 0 0195 0 2381 102 74 650 O0 0 0195 0 0195 0 2186 0 2576 0 0195 0 2381 102 73 665 0'3 0 0195 0 0180 0 2186 0 2561 0 0195 0 2367 102 73 0 0180 0 0167 0 2173 0 2520 0 0194 0 2326 102 72 6~2 iedC 0 0167 0 016~ 0 2135 0 2470 0 0191 0 2279 102 67 690 O0 0 0168 0 0166 0 2090 0 2424 0 0189 0 2236 102 61 700 00 0 0166 0 0168 0 2050 0 2384 0 0186 0 2198 102 56 710 00 0 0168 0 0168 0 2014 0 2351 0 0184 0 2167 102 52 720 00 0 0168 0 0172 0 1985 0 2326 0 0182 0 2144 102 48 730 00 0 0172 0 0172 0 1963 0 2307 0 0181 0 2126 102 45 740 00 0 0172 0 0175 0 1947 0 2293 0 0179 0 2114 102 43 755 00 0 0175 0 0176 0 1935 0 2286 0 0179 0 2108 102 42 760 00 0 0176 0 0178 0 1929 0 2283 0 0178 0 2105 102 41 770 00 0 0178 0 0179 0 1927 0 2284 0 0178 0 2106 102 41 780 00 0 0179 0 0161 0 1927 0 2267 0 0178 0 2089 102 41 790 00 0 0161 0 0146 0 1912 0 2219 0 0177 0 2041 102 39 800 00 0 0146 0 0144 0 1867 0 2156 0 0174 0 1982 102 33 810 00 0 0144 0 0140 0 1811 0 2095 0 0171 0 1924 102 26 820 00 0 0140 0 0142 0 1757 0 2039 0 0167 0 1871 102 20 830 00 0 0142 0 0141 0 1707 0 1990 0 0164 0 1825 102 13 840 00 0 0141 0 0153 0 1664 0 1958 0 0161 0 1796 102 08 850' 00 0 0153 0 0162 0 1637 0 1952 0 0160 0 1792 102 05 860 00 0 0162 0 0166 0 1633 0 1961 0 0160 0 1802 102 04 870 00 0 0166 0 0168 0 1641 0 1975 0 0160 0 1815 102 05 880 00 0 0168 0 0171 0 1654 0 1993 0 0161 0 1832 102 07 890 00 9/30/02 8:58:16 am Shareware Release page 19 Tom Halverson Home Trails End, Div 4, Blk 2, Lots 3 & 4 Jefferson Co. - Sec 16, Twn 27N Rg 1E WM LEVEL POOL ROUTING TABLE LEVEL POOL ROUTING TABLE I1 I2 201 SUM O1 O2+202 STAGE TIME < ...................... cfs min ..................... > (ft) (min) 0 0171 0 0172 0 1670 0.2012 0 0162 0 1850 102 09 900 O0 0 0172 0 0172 0 1687 0 2031 0 0163 0 1868 102 11 910 O0 0 0172 0 0175 0 1704 0 2051 0 0164 0 1887 102 13 920 O0 0 0175 0 0175 0 1722 0 2072 0 0165 0 1907 102 15 930 O0 0 0175 0 0176 0 1741 0 2092 0 0166 0 1925 102 18 940 O0 0 0176 0 0178 0 1758 0 2112 0 0167 0 1945 102 20 950 O0 0 0178 0 0179 0 1776 0 2133 0 0169 0 1965 102 22 960 O0 0 0179 0 014~ 0 1795 0 2119 0 0170 0 1949 102 24 970 O0 0 0145 0 0120 0 1780 0 2045 0 0169 0 1876 102 22 980 O0 0 0120 0 0113 0 1712 0 1945 0 0165 0 1780 102 14 990 00 0 0113 0 0106 0 1622 0 1840 0 0159 0 1682 102 03 i000 O0 0 0106 0 0107 0 1529 0 1742 0 0153 0 1589 i01 91 !0i~¥ 0 0107 0 0105 0 1442 0 1654 0 0147 0 1507 10! 80 1020 ~0 S '0105 0 0129 0 1364 0 1598 0 0142 0 1456 101 71 4030 00 0 0129 0 0147 0 1317 0 1593 0 0139 0 1453 101 65 1040 00 0 0147 0 0154 0 1314 0 1615 0 0139 0 1475 101 64 1050 O0 0 0154 0 0158 0 1335 0 1647 0 0141 0 1506 101 67 ~ 060 0 0158 0 0160 0 1364 0 1682 0 0142 0 1539 101 70 1070 0 0160 0 0162 0 1395 C 1716 0 0144 0 1572 101 74 1088 0 0162 0 0151 0 1425 0 1738 0 0146 0 1591 !01 78 -090 90 0 0151 0 0141 0 1444 0 1736 0 0147 0 1589 I0t 80 ii00 0 0141 0 0139 0 1441 0 1722 0 0147 0 1575 101 80 i!iO 0 0139 0 0182 0 1428 0 1750 0 0146 0 1603 t01 79 1120 0~ 0 0182 0 0129 0 1455 0 1766 0 0148 0 1618 101 82 1130 0 0129 0 0114 0 1469 0 1712 0 0149 0 1563 101 84 1140 0 0114 0 0132 0 1417 0 1669 0 0146 0 1523 101 77 1150 O0 0 0137 0 0131 0 1380 0 1648 0 0143 0 1504 101 72 1160 O0 0 0131 0 0142 0 1362 0 1635 0 0142 0 1493 101 70 1170 0 0142 0 0137 0 1351 0 1630 0 0142 0 1489 101 69 1180 00 0 0137 0 0143 0 1348 0 1627 0 0141 0 1486 101 68 1190 00 0 0143 0 0139 0 1345 0 1626 0 0141 0 1485 101 68 !200 00 0 0139 0 0144 0 1344 0 1627 0 0141 0 1486 101 68 1210 00 0 0144 0 0140 0 1345 0 1629 0 0141 0 1488 101 68 1220 00 0 0140 0 0144 0 1347 0 1631 0 0141 0 1490 101 68 1230 00 0 0144 0 0143 0 1348 0 1635 0 0141 0 1494 101 69 1240.00 0 0143 0 0144 0 1352 0 1639 0 0142 0 1498 101 69 1250 O0 0 0144 0 0143 0 1356 0 1643 0 0142 0 1501 101 69 1260 O0 0 0143 0 0146 0 1359 0 1649 0 0142 0 1507 101 70 1270 O0 0 0146 0 0144 0 1364 0 1655 0 0142 0 1512 101 71 1280 O0 0 0144 0 0146 0 1370 0 1660 0 0143 0 1517 101 71 1290 O0 0 0146 0 0147 0 1374 0 1667 0 0143 0 1524 101 72 1300 O0 0 0147 0 0146 0 1380 0 1673 0 0143 0 1530 101 73 1310 O0 0 0146 0 0147 0 1386 0 1680 0 0144 0 1536 101 73 1320 O0 0 0147 0 013~ 0 1392 0 1674 0 0144 0 1529 101 74 1330 O0 0 0135 0 0126 0 1386 0 1646 0 0144 0 1503 101 73 1340 O0 0 0126 0 0123 0 1360 0 1609 0 0142 0 1467 101 70 1350 O0 9/30/02 8:58:16 am Shareware Release page 20 Tom Halverson Home Trails End, D~v 4, Blk 2, Lots 3 & 4 Jefferson Co. Sec 16, Twn 27N Rg 1E WM LEVEL POOL ROUTING TABLE LEVEL POOL ROUTING TABLE I1 I2 201 SUM O1 O2+202 STAGE TIME < ...................... cfs min ..................... > (ft) (min) 0.0123 0.0119 0 1327 0.1568 0 0140 0.1428 101 66 1360 00 0.0119 0.0121 0 1291 0.1531 0 0138 0.1393 101 61 1370 00 0.0121 0.0120 0 1258 0.1499 0 0136 0.1363 101 57 1380 00 0.0120 0 0120 0 1229 0 1469 0 0134 0.1335 101 54 1390 00 0 0120 0 0121 0 1203 0 1443 0 0132 0.1311 101 50 1400 00 0 0121 0 0121 0 1180 0 1422 0 0131 0 1291 101 48 1410 00 0 0121 0 0120 0 1162 0 1403 0 0130 0 1273 101 45 1420 00 0 0120 0 0122 0 1145 0 1387 0 0128 0 1258 !01 43 143~ 0 0122 0 012~ 0 1131 0 1374 0 0128 0 1247 101 41 !4~ 0 0121 0 0071 0 1120 0 1312 0 0127 0 1185 101 40 1450 00 0 0071 0 0028 0 1062 0 1160 0 0123 0 1037 101 33 1460 O0 0 0028 0 0014 0 0923 0 0965 0 0114 0 0851 101 15 1470 O0 0 0014 0 0004 0 0748 0 0766 0 0103 0 0663 100 93 1480 0 0004 0 0003 0 0571 0 0579 0 0092 0 0487 100 71 1490' 00 0 0003 0 0000 0 0406 0 0409 0 0081 0 0328 100 51 1500 03 0 OOO0 0 000! 0 0256 0 0258 0 0072 0 0186 i00 32 15!0 2 900! 0 0000 0 0122 0 0124 0 0063 0 0060 100 15 1520 O 0000 0 0001 0 0034 0 0035 0 0026 0 0009 100 04 1530 0 000i 0 0000 0 0005 0 0006 0 0004 0 0002 100 !0 i549 O0 0 O000 0 0000 0 0001 0 0001 0 0001 0 0001 100 10 1550 00 0 0000 0 0000 0 0001 0 0000 0 0000 100 10 1560 00 0 0000 0 0000 0 0000 0 0001 0 0000 0 0000 100 10 ~570 00 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 ~5~t 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1597 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1600 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1610 0 0000 0 000~ 0 0000 0 0000 0 0000 0 0000 100 10 1620 O0 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1630 O0 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1640 O0 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1650 00 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1660 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1670 O0 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1680 O0 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1690 O0 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1700 O0 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1710 O0 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1720 O0 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1730 O0 0 0000 0 0000 0 0000 0 0000 0 0000 0 0000 100 10 1740 O0 SOILS DATA ~.. SOILS DATA 09/30/2002 09:54 3603794451 JEFF CO DCD PAGE NORTHWESTERN TERRITORIES, INC, 717 SOUTH PEABODY STREET, PORT ANGELES, WA 98362 Engineers · Land Surveyors · Geologists Construction Inspection · Matarfals Testing (380)¢.52-8491 1.800-054-5545 FAX452.8498 E.t~all: in,o(~ntl4ucom L ......................... 0t~PT. 0F COMMUNt~ OEVELOPM~NT GEOTECHNICAL REPORT For Lots 3 and 4, Block 2, Trails End 4th Addition Located in Section 16, Township 27 North, Range 1 East, W.M. Jefferson County, Washington Prepared for DIANE HALVERSON WILLIAMS Prepared by NORTHWESTERN TERRITORIES, INC. 717 S. Peabody Street Port Angeles, Washington 98362 June 13, 2002 8,9./'38/2882 09:54 3603794451 JEFF CO DCD PAC_~ 82 GEOTECHNICAL REPORT For Lots 3 and 4, Block 2, Trails End 4th Addition June 13, 2002 JUL -3 20O2. Diane Halverson Williams L.~ ~ ~_, ~ i:,..}.0,i.. :! 0 u,~¥._.j 130 Madrona Vista DEPt. 0F C0~,~MU~TY OEVEL'~PN~NT Pod Ludlow, WA 98365 Sublet: Geotechnical repo~ for Lots 3 and 4, Trails End 4~ Addition, Tax ~'s 950200202 and 203, Section 16, T27N, R1E, Jefferson Count, WA Dear Ms. Williams: Introduction At your request, Bill Payton of Northwestern Territories, Inc. conducted a geotechnical inspection of the above-mentioned property on June 7, 2002. The purpose of this inspection was to examine the bluff at the subject property by visual means and report our findings in regards to the relative stability of the bluff in conjunction with future development of the property. Site Description The subject property consists of two vacant lots located on the east side of Thorndyke Road at the intersection of Seattle Drive. The property is bounded on the north by developed residential property, on the west by Thomdyke Rd., on the south by wooded land and on the east by a high bluff. The majority of the property has been cleared and is overgrown with grass and brush. There is a wooded strip along the south side of the property. The bluff is well vegetated with trees, brush and ferns.'The bluff has been logged in the past and most of the existing trees are between six and twelve inches in diameter. Most of the existing trees and the old stumps have straight trunks which suggests that minimal or no slope creep is occurring. Some minor surficial slumping was noticed in areas of thin vegetative cover. No springs or seeps were noticed on the bluff face, however, the area below the base of the bluff (off of Edna Place) was wet. The bluff is about 100 feet high and has a slope of about 30 to 34 degrees from horizontal, which is at or below the natural angle of repose for loose cohesionless material. 09/30/?002 IFl:fi,1 3603794451 JEFF CO DCD PAGE 83 :~,-" ~'-:~ : . '-" ,, ;, .':'~' 'I ",'JU I[~ ~ k 3 DO2 Geoloqic ConditiQns ~: :)' cm~uNrrY oFvr, The Soil Survey of Jefferson County maps the soils in the area of the subject property as the Alderwood gravelly sandy loam (AIC). This unit is described as having formed in glacial till with a slowly permeable cemented layer at 20 to 40 inches There is a perched water table above this cemented layer dudng the winter. Permeability above the cemented layer is moderately rapid, runoff is slow to medium and the hazard of water erosion is slight to moderate. The Survey maps the bluff face soils as the Cassolary sandy loam (CfE). This soil formed in reworked glacial and marine sediments. Runoff of this soil is rapid and the hazard of water erosion is severe. The Coastal Zone Atlas of Washington maps the following soils in the area of the subject property. The Vashon lodgement till (Qvtl) is mapped on lot 3 and the west side of lot 4. The Vashon advance outwash (Qva) is mapped on the east side of lot 4 and the bluff is mapped as Undifferentiated stratified sediments older than Vashon lodgement till (QP0. - The Vashon lodgement till (Qvtl) is described as a compact mixture of boulders, cobbles, pebbles, sand, silt and clay, general','.,, ovedain by' 1 to 5 feet of ablation ~, ~e ,,:,',tlas also describes this soil as ue~ng exceiient for foundation stability and good for seismic stability. The Atlas maps the slope stability of this soil as Stable (S). The Vashon advance outwash (Qva) is described as a member of the Vashon Drift. This soil is composed of well sorted, well stratified sandy gravel. The Atlas describes the foundation stability of this soil as good to excellent but may be poor on slopes that approach the angle of repose (30 to 39 degrees). The slope stability of this soil is described as generally stable in slopes up to the angle of repose and may stand in steeper slopes for short periods. Seismic stability is described as 9ood. The Atlas maps the slope stability of this soil and the Undifferentiated soils found on the bluff as Unstable (U). Visual observations of four test pits located on the property (presumably for septic design) revealed sand with a trace of gravel. Likewise, surficial soils exposed on the bluff face were sand. Conclusions and Recommendations The subject property appears grossly stable at present. The sandy soils on the property and bluff have the potential to be very erosive if sufficient ground cover - is not maintained. Tree removal or other disturbance of the vegetation on the bluff face could affect the subject property. 0913012002 09:54 ..3_.60379445! JEFF CO DCD PAC_~ 04 ..... · ~ .~ .... ,~.. ~,. ........ ~. d k-3 2002 JEFF[RdUN CUUN1Y The following recommendations should be considered with regard s~pT' 0F COn~mUNITY OEVELOPMEN" development of the p~pe~: 1. Maintaining ground cover will help reduce erosion from surface runoff. Any bare areas that develop should be revegetated. Native vegetation that requires little or no irrigation would be the most beneficial. 2. Surface water should not be allowed to flow over the face of the bluff and cause erosion of the bluff face. This can be controlled with vegetation and using berms or swales to direct runoff to a drainage system. 3. Surface runoff from hard surfaces such as roofs, driveways, walkways and patios should be controlled and routed to a community storm sewer or to a drainage system if a community storm sewer is not available. Surface water discharge to adjacent properties should not exceed predevelopment conditions. 4. Silt fences or other sediment control devices may be needed during construction so that sedimentation onto adjacent properties does not exceed predevelopment conditions. 5. Heavy irrigation or other activities that would contribute large quantities of water to the soil should be avoided. One cause of landslides is the presence of excessive groundwater in the soil near the bluff. 6. All drainage control devices should be maintained in good working order and inspected at least once a year. 7. The Soil Survey mentions the poSsibility of a shallow perched water table during the wet season. Thus it would be beneficial to control wetness under the home in the building design. One measure would be the use of footing drains. 8. A building setback of at least 35 feet from the edge of the bluff should be established. 9. The septic drainfield should not be constructed between the house and bluff. 10. An engineered drainage control plan should be developed for this property to address items. 3, 4, 5 and 6 above. A contractor knowledgeable in the construction of these types of features should be retained for this work. For f~rther information please review the three pamphlets, which are enclosed with the original of this report, published by the Washington State Department of 09/30/2002 09:54 3603794451 JEFF CO DCD PAGE 05 Ecology entitled: "Slope Stabilization and Erosion Control Using Vegetation", ........... _ "Surface Water and Groundwater on Coastal Bluffs" and "Vegetation Management: A Guide for Puget Sound Bluff Property Owners". ,:,.,,. ! .......... '..... Based on the findings, recommendations and limitations of this report, the proposal should pose no unreasonable threat to persons or properly nor decrease slope stability. .<,.;. ., ~' ~: ! ~.~ .':, Limitations ~ . '- This report is based on a visual inspection of the existing site conditions, barfing major catastrophic events such as earthquakes or abnormal Weather conditions. No scientific measurements, tests or calculations were performed. The findings and report are limited to the normal standard of care of the industry for an investigation without benefit of scientific data and calculations. The sole objective of this investigation has been to diagnose the geotechnical conditions at the subject property. The property may be affect~;d by other development regulations that are not addressed in this report. The report has been prepared for the exclusive use of our client in conjunction with the above referenced project. It may be used by others only with expressed written permission of the Engineer. The report has not been prepared for use by others or for other uses. The observations, interpretations, and conclusions herein are based on generally accepted professional engineering and geologic principles and practice. This warranty is in lieu of all others, either expressed or implied. Sincerely, NORTHWESTERN TERRITORIFS, INC, J. R_ Jerry Newlin, P.E. Principal Engineer Bill Payton; L.E.G. Engineering Geologist G:\Gen~l]ill\Repods\WlDI0201.slope sb3blllty.16(26-1E).Thorndyke Rd.doc - SOIL SURVEY OF Jefferson County Area, Washington United States Department of Agriculture Soil Conservation Service In cooperation with Washington Agricultural Experiment Station COUNTY AItEA~ WASIIlNGTt>N lure i> about 50°1:. Th(: abc>ye 32°1: Kz'{m'inK .season ranKes ltunoff is medium, and thc hazard cd' wal(q' ('ri)si()n ft'(ml about 150 to ~00 days, and tile al>,~ve 28°1'' growing moderate. This soil is used mainly f,,z' pz'~,dm'in~ trpcs and slqts()lt ranges fr~mi :tt)~mt 2(~ t() 240 days. 'l'hcsc soils are fro' wildlife habitat, and rccrc:tti(m aFl'as. (':tpat',ility unit ass¢,ciated mainly with Ahl, GcC,ye, l.ystair, ()lcte, and Vie-I; woodland group 3d2. 'l'rit{m s{fils, lloodsport gravelly loam, 0 to 15 I}crcent slopes In u rcpr(,scntativ(, t>r()fih, a})()ut 3 im'h('s ~,f nc'edits. (HpO).~This nearly level to rolling soil is in small, isolated ],,:tx'cs. bark. ami humus ('()v('r the suri'ac(.. Tit(' ul)p(,r 17 areas ()n glacial tt,rrac(, rid~(.ll,i)s. ]']h'vati(,n )'an~.s im'h('s ¢)f the ~ ,il is r(,ddish-brown very ~rav(,lly sandy h)am. 3~ [o 500 feet. The upi}er 12 inches or more is dark reddish- Below this, to a depth of 28 inches, is dark yellowish-brown tm)wn grav('lly h)am. th'action is sliK}tll>' acid 1<) m('dium gravelly sandy loam. Beneath this is a very dark gray ce- acid. Permcabilily is moderate al)()vc the c(,n~enlcd lavm'. mm~tcd layer. Glacial cobbles and st(m(.s are pres(mt on Tiffs soil holds about 3 to 5 inch(.s <)f wat(,r availal)h,' f~)r the surface and throughout thc soil. plants. Nearly all of tim Hoodsport soils are wooded. Besides This soil is used mainly for l>rodu(:ti,m ,)f tre(,s for producti(m of trees, another important usc is for rural wood- wildlife habitat and recreation arm.as. Cai)al}lilly unit IV('-I' land homesites, woodhtnd gr,)ut) 3d2. Hoodsport very gravelly sandy loam, 0 to 15 percent lloodsl)ort-Grove very gravelly san(Iv loams, 0 lo 3(} Mot)es (MoO).~Dfis nearly level to rollin,g s¢)il is on glatt:ti i)cret'nl sl()l)(.s (~rD).-- This )~t:~l)))i~,~ ~l)~i( {.~,,~isls [t,rrac(.s. In most places slopes rang(' from 6 t(> 12 pcrctqit, ab()ut equal pt'ol)orti()ns of lh)()dspt)rt v,q'v gruv(.lly Representative profile 60 feet west of U.S. Highway 101 loam, 0 to 15 percent slopes, and Grove very ~rav(,lly loamy and 120 vards s(,uth and 120 yards west of SI';~SW~ corner sand, 15 to 30 percen[ slopes. Thc tt,,,)dsl>~,rt s,,il is mostly s(,c. 29, q'. 25 N.. R. '2 W.' undulating to g('ntly rollin~, and thC, (h'(,v(. s,)il i~ mr,stlv hilly. O1~2~ 2 inches to 1 inch, needle, leave% wood, and bark. This complex is used mainly f,,t' pr,,ducti,)n ,,f tr,'.cs and O2~1 inch to 0, black (5YR 2.1) partly decomposed needle, leaves, wood, and bark; strongly acid; abrupt, smooth bound- for wildlife habitat and recrcati¢,n ar,'as. Cap:dfility unit arr. (~.~ t,, 2 inches thick) VIe-I' woodland group 3d2. B21ir~0 t,~ 6 inches, reddish-br,)wn (55'II -t 4:, very ~ravellv - sandy l,,am, reddish brown (5Y1{ 5 4, dry: weak. ~i~ediu:;t and coarse, granular structure: s,,ft, very {riable, n,,nstickv, IIOYpUS Series nonpht~tic: many roots: GO pereet:t ~t~t,.'el; >trongly acid; gradual, wavy boundary. (4 to 5 inches thick, B22ir~O to 17 inches, reddisb-brown (5YI{ 4 4: very gravelly The H,)ypus series c~msists r,i' s~,m(.xv}mt sandy lo:mx: reddish brown (55'I{ 5 4~ dry: weak, fine and drained, gravelly soils. These s~ils f,,rmt.d in glac'ia! medfum. ~ubangular blocky structure: soft, very friable, non- wash oi1 terraces. Slopes ran~c fl'~,m 0 ir, 50 t){.l'COnt. >tic. ky. n,,nplx~tic: many roots: 60 percent gravel; strongly acid: gradual, wavy b~,undarv. (10 lo 16 inches Ihiek) ' tion ranges from 100 to 500 fi.t.t. N:~tiv,. V('~{qali,~ll C1~17 to 2S inches,' dark veilowish-brmvn (10YR 4 4) very mainly ()i' Douglas-fir, western hr.mir)ok, xvcstiq'n rcdcedar. gravelly sandy loam, yellowish brown (lf)YI{ 56{ dry: :nzc~- llladr,)Ii(,, rhododendron, salal. ()rt.~,m ~rztp,.. huckl,.b,q'rv. six'e: s:,ft, very friable, nonsti,::ky. ::,,z,plastic': many r,,ots: atnd [)l'a('liet!. Annual prccipilati,,z~ i'&ik~t.5 f!q)Ill 1~ 70 pe:'ce:,t gravel;~',~ong~5- ' acid: ab:'ui,t, sm,,,,th b,Al~darv. (6 t,, 12 inches thickl ' ire'hts. Th{' aVOl'llg(, annual air l(.lnl,r.r;t~uro is a}>,*tlt .50:1". C2sim 28 to 45 incht~, dark-gray (SY 4 1; very gravelly sandy Thc above 32=F gr,)wing s('as, ~: rana,.> fr,,m 200 t,, 260 1,)am, ~ray (5Y. 51) dry; m~<ive; extremely hard, extremelk' days, aqd the above 28°F gr~)wi~t~ $(.as,,n rang(.s fr,)m 260 Ih'm: str,,ngly cemented; 55 percent gravel: strongly ack~; to 300 days. Thcs(. soils are ass()ci:/t~.d mainly with diffuse, smooth boundary. (14 to 20 inches thick) C3~5 inch,, very compact, weakly cemented glacial till. (Many Alderwoo~. Cassolary, Carlsborg. (]allnm, Dick. Everett, feet thick~ Kitsap, and Sinclair soils. In a representative profile in a wooded ar(.a, abotlt 3 The B horizons are dark reddish brown to reddish brown. The inches of needles, leaves, twigs, and dcc, mq)(Mng ()rganic B and C horizons are 50 to 70 percent gravel and cobbl~. The C2sim horizon is gray, dark gray, or olive gray and many feet matter cover the surface. The upper i0 inches of thc thick. This soil is medium acid or strongly acid throughout the dark-gray and dark-brown gravelly l~amv sand. Below this. profile, to a depth of 2G inches, is dark y~,lh,wish-brown ~ravelly loamy sand. The underlying material ¢',msists of two dark The soil is moderately welt drained. Permeability is moder- grayish-brown layers. The upper las'{,r, between depths atelv rapid above thc cemented layer. Roots penetrate to a 26 and 44 inches, is gravelly loamy sand, and the lower layer, dcp{h of 20 to 30inches. This soil holds 2 to 4 inches of water between depths of 44 and 60 inches, is very gravelly sand. available for plants. Runoff' is slow to medium, and the Most of the Hoypus soils are wooded. Besides pr{~duction hazard of water erosion is slight to moderate. A pcrct~ed of trees, other important uses arc limited pasture, home water table is on top of the cemented layer during thc rainy gardens, and homesites. season. Hoypus gravelly loamy sand, 0 to 15 percent slopes This soil is used mainly for producing trees and for wild- (NuG).--This nearly level soil is on rolling glacial moraine life habitat and recreation areas. Capability unit Vic-I; terraces. In most places slopes range fr,,m 6 re, 12 woodland group 3d2. Representative profile on s~mth side ,~i' rt,ad Hood~port very gravelly sandy loam, 15 to 30 percent SW~NE~NI']~ sec. 16, T. 26 N. R. 1 W.' slopes (HoD).~This hilly soil is on glacial terraces. In the ' hi~}ter ar ~as t he soil is generally 20 to 24 inches deep to the 01~3 inches to 1 inch, needle, leaves, bark, :~nd fragments of wood. c{'mcnt~d layer, and in the lower areas it is 24 to 36 inches O2~1 inch to 0, black (SYt~ 2:1), partly dec,,mp~,sed c, rganic (lcrq) t,, this htvcr, matter from needle, leaves, bark, amt fra~ment~ ,,f w~,,,d strongly acid; abrupt, wavv b.und:trv. (~ ~ t~, I ~ ~ im. hcs thick, Inch~dcd wit}~ this s~il in mapping ar~' small areas having A2--0 to 1~ .5 inch,, dark-gra~' (10Ylt 4 1; ~avelly lo:troy sand, largo basalt b,mkh,rs and basalt bedr,M~ outcr~q~s, gray (10YI~ 6/1) dry; weak, line, granular strm'tur~': :21; SOIL S U lC,,[ E Y ~, t.' 35 percent grayS; st:'.t,~]v acid; :dn-,,In wavv bound- arr. ~I u)3 im'h~x~ thick) ' ' ' C:tt~at)ility milt Vic-1 w,~odl:md ~r,,ul~ 41'2 ~ B21ir ' 112 I,, Ii)inches. dark-l~r.,~ ~75Y1{ t 4: gravelly hmmv ~ar,,l, light bl'o,l'n (7.5YR ,; I) dry: reddish-br.wh (5Y/{ ]loci Series i -I, slains arm CO;L~ings --n suH;Lcc.s ,,¥ t)ebldc.4; single grained; h.,s,., :L-nsticky, n,,nphu.~ic: m'.mv /ine and llledittlll roots; -t5 pcn'cnt gravel; nm, lima acid: ciear, wavy boundary. (S to Thc llm'l s,q'ics t'¢)II$1NIN Id' m,,~l,'ratclv well dr:lin,.,l 12 inches thick} that f(n'mcd m alluviuln ,m m'arlv h'vcl] h,w river B22ir Il) ~,, 26 inchas, dark veil.wish-brown (10YR -t"4) gravelly Slopes rang~, fr, m~ 0 t,, 3 p.rc~.n~ l':h'vati,,n ranges fi, mt l,,amv sand, light yello~'ish M'uwn (10YR 6.4~ dry; single - grain'ed: lo,;se, n,,nsticky, n,mpl~tic; COllllllOn fine root.--;; sca level t¢~ 300 fcet. Native vcgctatitm ('¢,nsists mostly of iron :tnd mangan~e stains .n some pebbl~; 40 percent gravel; red ahhq', xvilhm-, c{~tbmwood, wcstcrn }nqnh.'k. Sil ka spruce, medium acid: clear, wavv b.undarv. (12 to IS inches thick) bigh'af map[(., azmual grasscs, :tll~l sWt)Fdf('l'll...knzmal pre- C1~26 to 44 inches, dark ~ravish-brk,wn (10YR 4.'2) gravelly cipitation raligt% from 120 to 160 izwhcs Thc av¢.ra~e annual hmmy sand, light brownish gray (10YR 6'2)dry: single - grained;loose, nonstickv, nonplmstic;fewfineroots;4~percent air temperature is about 49W. Thc abovv 37F zravcl; medium acid: a~rupt, wavv boundary. (10 to 20 inches s0~tSOll is ab(,ut 180 days. and the ab~w(. 28°I.' groMng thick, ' is about 210 days These soils ar,' ass, Mated with tt~,h and C2 -4-t t,~ 60 inches, dark grayish-brown (10YR 4 '2) very gravelly ' ' sand. light brownish, gray (10YR 6 2, dry; single grained; loose, Queers nonsticky, mmpl~uc; 60 percent gravel; mediuln acid. In a repn,s(,ntative prc~fikr in a w.oded ar('a, till. Ulq.'r 6 inches of thc s,,il is dark ~,livc-gray l.alny tim. samL Ih,neath I'~:tntys:tml~,rsandvloam. TheB2 horizcms aredark-brown ordark Tho llOXt ]aVOI'. ,'xtvmtin~ t¢~ a ,h.l)l}t ,,f ")') illo}l~.<, is i, utmv yellowish-},n,wn gr2tvelly loamy sztnd lo gravelly fine sand. They - -- -are 35 1,~ 7U percent m'avel. Tl~e C h.,riz,ms are }lark-gray ,,r dark tim· sand. Bi're'arb thi~u, a (h.[)r }; , q' 30 im'h,.s, i> v,q'v a:a}isk-t,l,,wz; atax'elfv loalnv sand ,,r very gravelly lea]nv sand. gray very ~rav~dly loamy sand. B,.b,w this is v,.rv I,~ place, :,t depths below 4i/{m'hes. there ake compabted ,r'weaklv coarse sand that extends to a dcpth {[I1 t)0 cemented lavers. The B and C ~ or zons are medium acid to slightlk' :,-id. - Hud s, fils a,',' used mainly fl_,r pr,.,ducti, m ,,f tn.,.s wildlife }m},itat and retreat'bm s,,m,.ul[at ;.,,,:'iv (h'ain(.,! hcavvAit',,am. (m h,w riv,.r t(.rrac~.s. The surf::,,. ;<' diss, vt,.d in- :mtnv This s,,ii }~,,i,ls '2 t,, 4 inc. h,.s ,,f war,q-available fi,r plants. Representative pr,,fih. 100 f,,'t ,.,st ,,f Si)ur lb,ad. 200 Run,,ff is sh,w re medium, and thc hazard .f water ('r,M,m yards fl',mt Qm'(.ts Riv,.r Road in NI.~'SE~NW:4 s,.,.. 20. sii~}xr r,, m,,d(,rzttc. ~. 24 N.. ti. 11 W.: ~ This-" ' . ' >, dl i5 (ist'd lilailllV I, ,r 1~!, ,dki('[i, ~II Of tn:es, recreati,n Ai~0 t.:. ,; inches, dark o!ive-arav , 5Y 3 2> loamy fi:~c ;' lb · :~,':',';t,'2,. is us,'d f,,:' a'rtJwil!a l,,.r-ntani.Iit pasttlrc. }lax'. vt.t.: fr'i,bh., n,msh,'kv, r:.,r.:,h:-'L: n,,nv fh,e :,nj ' thick ~l',~ti[) 41'2. C1~6 t,, Ill inches, d:~rk-~rav (.SY ; t. fine sari,tv i, :m;. m':ty Ilo) pus gravelly loamy sand, 15 to 30 l)ercent slopes (SY 6 13 dry; weak, thicff, pi.tv $:r'ucturc: st, fr[ very frk[ble, ~uD~.~This hilly soil is on glaciM outwash terraces where n,,nsticky, ~{onpl:z~tic: many tm})and inedium r,,,,rs: medimu they c,,nv,q.,,;,, with the steep ravines and drainagewavs, acid:clear, smooth boundmtv. ~:1 r,, *; inches thick. - C2~10 1,, '2'2 inches, dark-gray' (SY 4 l'; ],~atnv fine >x:i,l, Im'lud,d u ith this soil in nlapping arc small areas of s,mw- (sY 6 1': dry: m~sive: ~,,ft. very fl'iablc.' nonstickv, non- what po,,rly drained hcavv silt loam. plastic: many fine and mediunt r,,.ts: 6 bands, ~ i:,'h thick. ~[lllt,ff iN medium, alld the hazard of water erosioll is of loamy very fine sand; mediuln acid: abrupt, sm,.,:h b~mnd- Inoderatc. This soil is used mainh' for producing trees and arr. (12 to lb inches thick~ IIC3~22 to 30 inches, very dark re'ay (SY 3 1'~ vc~y gravelly for wildlife habitat and recr(,ati, m areas. Capability unit loamv sand, gray (55'6'])dry:sin~legr:tined:loose. VIs-l' w,,,Mland ar, rap 4f2. nonp]astic; common fine and medium ro,,ts; medi'tm aci~i; lloypu~ gravelly loamy sand, 30 to 50 percent slopes clear, wavv boundary. (8 1o lt~ ir~'l~cs thick~ HuE:.~This steep soil is on the sides of ravines and IIC4~30 to 60 inehes.'verv dark re'ay (SY 3 1, v,.rv watcrwax-s },,,i,,w thc terraces, c-arse sand, gray (5Y B,'l) df'y: ~ingle grained: l[,,se. sticky, nonpl~tie; few roots; medium acid. Rum,fi' is medium to rapid, and tho hazard of water er,Men ' ' ' The A1 horizon is dark olive-gray, gray, or very dark grayish- ,< m~derat~. !~, s(.ver(.. This s,,il is used mainly for production brown loamy fine sand to fine san,iv loam and I(} I,, 2,) per,'cnt ,~[ trccs and I',~r wildlife habitat and recreation areas. Cap- gravel. The CI and C2 horizons are 'vtqv dark gray. dmk gray, ability unit Vis-1 - woodland group 4f2. very dark gray~h brown. They have thi~ lavers of linc ,:tndv l,mm and hmmv fine sand that eonSain gravel in' t)laces. The II(':~ and Hoypus grnvellv sandy loa~n, 0 to 15 percent slopes IIC4 horizons have the salne color ranges :~ the C1 and (72 horizons. ~ HvC).~This nearly' level {o rolling soil is on glacial terraces. They are very gravelly and eobt,b' ,',,:,'~. ~:md ,,' ,'~,'y ~,avellv The upp~.r 3 t~, 4 inches of this s~dl is gravelly fine sandy and'c,,bbly loamy sand with thin lavers ,,f fi,mr tcxtttrcs l,~am. Bel,,w tllis is 6 t, 9 in('hcs of dark-br6wn gravoll~' at random, fh'avel and cobbles re:tko up ~i~l t,~ 70 l~tU,.cn, ,,t' sandy l,mm. IIC3 and IiC4 horizons. This s,,il h,,lds 3 t,, 4 inches (,f water availabh, t',,r l) ants. Includ,,d with this s~,il in m:qqdn~ are sm:d[ :tr,':~< Rtm,,ff is sh,w to m~.dium, alld thc hazard of water (.rosi,,n I{,~h st,ils and Qut,cts s~,ils. isslightt~m~,dcratc. This s,,il 0 nmd~'ratclv w,ll ,ir;tim.cl. l>~q'n~,.:t} This s,,il is tlscd mainh' for t,'-duction of trees and for rapid, iI,,,ts (':tli t)enctrate t~) a d,q~lh ,,t' IID,l'c t[l:t~ 6{} ~Mlif,. [m},it'.tt :tlat n.crcati.n ar'as M)out 15 tt, 20 per- This s,,il h,,lds a})~mt 3 t~,-t i~w}t,.s ,,;' w:tt, r :tv:ti'::t!,h. f,,r cent ,,( ~}~,. :t,'r,.:t~e ]las }~ccI~ cleared and is used fin' grim'lng plants, l{tm,4t' is shnv, and t}u* h:tz:trd ,,f x~atcr ~.r..-i, qt so~5 sux~vrY TAIILE 8.--Estimated soil properlies Depdt to-- Depth Clm~ification Coarse from fracdon Soil series m~d map symbols surface greater Seconal of USDA texture than Bedrock ~ high typical Unified AASHO 3 , water profile ~ inch~ table Inches Fe~ I~h~ Hob: HV .......................... ~ s ~5 ~36 Fine ~ndy loam and SM A-4 0 ~ndy loam. 3~ Vew gravelly coarse GP A-1 5-15 ~nd. HH ......................... ~ ~ ~5 ~36 Silt loam, very fine ML A-4 0 ~ndy loam, and fine sandy loam. 3~ Very gravelly coarse GP A-1 ~15 HKC, HKD, HKE, HLE, HMC__ >~ = 1~-3 ~29 } Gravelly silt loam and ML or CL A-4 or A-6 5-15 For Snahop~b part of HLE, ~ gravelly silt)' cia)' see Snahopish series, unit loam. SPD. For Teahvhit part of 29~0 Weakly cemented, very GC or CL A-4 or A-6 ~25 HMC, see Tealwhit series, compact gravelly , silty clay loam HNB ........................ ~60 ~ ~<j-1 0-20 Gravelly silt loam, ML or CL A-4 or A-6 5-15 gravelly silty clay loam, and cobbly clay loam. 2~25 Weakly cemented, ML or CL A-4 or A-6 2~0 very compact cobbly ~ clay loam glacial till. *Hoodsport: HoC, HoD, HpC, HrD_~ ~ 2~36 : 2-3 0-28 Very gravelly sandy GM or A-1 20-30 For Grove part of HrD, see loam and gravelly GM-GP Grove series, unit GoD. loam. 2S~5 Weakly cemented, very GM A-1 ~25 compact, gravelIy sandy loam glacial HvC .... ~ ~5 Hoypus: HuC, HuD, HuE, gravdlly sand and or GM loamy ~nd (gravelly sandy loam surface layer in places). Huel: HW ....................... ~60 ' 3-5 ~22 Loam)' fine sand and SM A-2 0 fine ~ndv loam. 22~ Very gravelly and GM-GW A-1 1~20 eobbly loamy sand or GM and coa~e sand. Indianola: InC, InD, loC, IoE ...... ~60 ~5 ~0 Loamysand, ~nd, and SM A-2 0 loamy fine sand (~ndy loam surface layer in place). Itswoot: lTD, ITF ............... ~ ~5 ~ Very cobbly silt loam CL A-2, A4, 2~5 and silty clay loam. or A-6 Kalaloeh: KAB ........................ )~ )5 ~25 ~am and fine ~ndy SM or ML A4 0 loam. 25~0 ~amy fine ~nd or SM A-1 or A-2 0 fine ~nd. KCC ........................ ~ ~5 ~24 Gravelly loam and fine SM A4 or A-2 0 sandy loam. ~ Very gravelly loam)' GP-GM or A-I 0 fine ~nd and SP-SM gravelly loamy fine sand. JEFFEP. SON COUNTY AREA, WASHINGTON sif/~zOica~tt z'~z e~,gineering--Continued Percentage passing sieve--- Corrosivity Available Shrink- No. 200 Perxnea- water Reaction swell - bility capacity potential i p~tential No. 4 No. 10 No. 40 Uncoated Concrete (4.7 mm) (2.0 mm) (0.42 mm) (0.074 mm) steel Inche~ per Inches p~r inch hour of soil ptl 100 85-100 70-85 35-50 2.0-6.0 0.13-0.15 4.5-5.5 Low_ ........ ttigh ....... Moderate___ None. 25-45 20-40 5-15 0-5 6.3-20.0 0.05-0.07 5.1-6.0 Low ......... Moderate___ Moderate. 25-45 20-40 5-15 0-5 2.0-6.3 0.04-0.06 5.1-6.0 Low _ ....... t Moderate. 65-70 60-65 55-65 50-60 0.6-2.0 0.14-0.16 i 4.5-6.0 Low or High ....... [ Moderate~_ Slight. ~ moderate. 55-70 50-6.5 45-65 40-60 < 0.06 I ' ................. ! Low_ ........ Itigh ....... .Moderate. 65-80 60-70 55-65 50-60 0.6 2.0 0. I4-0.16 4.5-5.0 Low or High ...... liigh ..... 5light. moderate. 65-80 60-70 55-65 50-60 (0.06 ....................... Low_ ........ t High ....... i tiigh ..... ~ Slight. 35-50 30-45 20-40 5-20 2.0-6.0 0.07-0.09 5.1-6.5 Low_ ....... Moderate __ Itigh .... ~ligi~. 30-t5 2,5-40 20-30 10-20 (0.06 ............ I ......... Low _ ....... Moderate_ _ tIigh .... ,'qight. 25-55 20-,50 15-30 5-15 6.3-20.0 0.0-t-0.06 5.1-7.0 Low_ ........ Moderate___i Moderate__ ! None. 90-100 80-90 50-7~ 15-30 6.0-20.0 0.00-0.12 5.6-6.0 Low_ ...... Moderate___ .~Ioderate___! Slight. 30-40 25-35 15-30 5-15 6.0-20.0 0.03-0.05 5.6-6.0 Low_ ....... Low_ ..... Moderate. 85-95 75-90 50-70 15-30 6.0-20.0 0.06-0.08 5.6-6.5 Low_ ........ Low_ ....... Moderate_ _! Slight. 30-65 25-60 20-55 20-50 0.2-0.6 0.08-0.10 5.1-6.0 Moderate ..... High ....... -Moderate___! None. 95-100 85-95 70-85 40-65 0.6-2.0 0.15-0.17 4.5-5.5 Low_ ....... tligh .... ! I{igh _ _ i None. 65-100 60-95 40-75 5-20 6.3-20.0 0.05-0.07 4.5-5.5 Low_ ........ Moderate__ _Ii 65-85 60-80 50-65 30-50 0.6-2.0 0.11-0.14 4.5-5.5 Low_ ........ tligh ....... ! lligh ..... _ ': None. 30-85 25-70 20-35 5-15 6.3-20.0 0.03-0.05 4.5-5.5 Low _ / 'M°derate---i Iligh. SOIL SURVEY Suitability a.s sovrce of-- 8oil seri~ and map symbols To,oil Sm~d and gravel l{oad fill * Hoodsport: HoC, HoD, HrD .................................. Poor: gravelly ......... Poor to unsuitable: ex- Good For Grove part of HrD, see Grove series, unit GoD. c{xssive rines; cemented .................. ' below a depth of 20 to 36 inches. HpC ............................................ Poor: gravelly ........ Poor to unsuitable: ex- Fair: moderate poten- ~ cessive fines; cementcd tial frost action. '/\ below a depth of 20 to 36 inches. Hoypus: HuC, HuD, HuE, HvC ........................ Poor: gravelly_ ........ Fair to poor for gravel; Good ........... fair to poor for sand if sieved: excessive fines. Huel: HW ........................................... Poor: loamy fine sand__ Fair to poor for gravel: Goo, i ............ L-xe~,s.sive rilleS; tln- suitablc for sand; linlited quantity. Indianola: InC, InD, loC, IoE .......................... Poor: loamy sand and Unsuitable for gravel; (;oo,1 ............. sand. poor for sand; exces- sive fines. It,swoor: lTD, [TF ................................... Poor: very cobbly_ ..... Unsuitable: fine Fair: moderate shrink- grained, swt, ll potential. Kalaloch: K~B ........................................... Good .................. Unsuitable for gravel; Good .................. fair to poor for sand; excessive fines. KGG ............................................ Poor: gravelly_ ....... Fair: excessive fines .... Good ................. JEFFERSON COUNTY AREA, ~,VAStIINGTON S3 i~tcrl,rct~ti,,n,~ of the aoi/~C~mtinucd Soil limitations for-- Soil featt,rcs affecting, - SCl)tic-tank filter fields Sewage lagoons Local roads Dwellings without Reservoir arenas Embankments, dikes, and streets b~ementa and levees Severe: very slow per- Moderate: 0 to 7 Slight: 0 to 8 per- Moderate: 0 to 15 Very slow permea- Low compressibility; meability; slopes percent slopes; cent slopes, percent slopes; bility; 0 to 30 perched water greater than 1.5 per- coarse fragment.s; Moderate: 8 to 15 perched water percent slopes; table at a depth cent in places; seasonal perched water percent slopes, table at a depth perched water of 24 to 36 inches. perched water table at table at a depth Severe: slopes of 24 to 36 inches, table at a depth a depth of 24 to 36 of 24 to 36 inches, greater than 15 Severe: slopes of 24 to 36 inches. inches. Severe: slopes percent,x greater than 15 greater than 7 percent,t percent. Severe: very slow per- Moderate: 0 to 7 Moderate: 0 to 15 Moderate: 0 to 15 Very slow perme- Medium compressi- meability; seasonal percent slopes; percent slopes; percent slopes; ability; 0 to 15 bility: semiper- perched water table at coarse fragments; moderate poten- perched water percent slopes; vious ;;'hen com- a depth of 24 to 36 perched water tim frost action, table at a depth perched water pacted; perched inches, table. Severe: slopes of 24 to 36 inches; table at a depth water table at a Severe: slopes greater than 15 moderate poten- of 24 to 36 inches, depth of 24 to 63 greater than 7 percent.~ tim frost, action, inches. percent. Severe: slopes greater than 15 percent3 Slight: 0toSpercent Severe: rapid per- Slight: 0to8 per- Slight: 0toSper- Rapid permeability: Low compre~ibility; slopes, meability; slopes cent slopes, cent slopes. 0 to 50 percent pervi,,us whe~ Moderate: b t,~ 15 per- greater than 7 Moderate: S to 15 Moderate: 8 to 15 slopes, compacted. cent slt,p~, percent in places, percent slopes, percent slopes. Severe: slopes greater Severe: slopes Severe: slopes than 1.5 percent; pos- greater than 15 greater than 15 sible hazard of' eon- percent, percent. laminating nearby ground water. Severe: seasonal water Severe: rapid per- Moderate: subject Severe: subject to Rapid permeability: Low compressibility; table at a depth of 36 meability; subject to flooding,t flooding.~ 0 to 3 percent pervio'~;s when :, 60 inches; subject to to flooding, slopps; se:c~,;nM compa,:ted; sea- fi6oding: possible haz- water ta})le at a a-,hal water table ard of contaminating depth of 36 to 60 at a depth of 36 nearby ground water, inches, to 60 inches. Slight: 0 to 8 percent Severe: rapid per- Slight: 0 to 8 per- Slight: 0 to 8 per- Rapid permeability: Low compressibility; slopes, meability; slopes cent slopes, cent slopes. 0 to 50 percent pervious when Moderate: 8 to 15 per- greater than 7 Moderate: 8 to 15 Moderate: 8 to 15 slopes, compacted. cent sic, pea. percent in places, percent slopes, percent slopes. Severe: slopes greater Severe: slopes Severe: slopes than 15 percent; pos- greater than 15 greater than 15 sible hazard of con- percent, percent,t laminating nearby ground water. Severe: moderately Severe: slopes Moderate: 0 to 15 Moderate: 0 to 15 ~ Moderately slow Medium compressi- slow permeability, greater than 7 percent slopes; percent slopes; permeagility; 0 bility: seiniper- percent, in places; moderate shrink- moderate shrink- i to 60 percent vious when corn- very cobbly, swell potential; swell potential, slopes, pacted. very cobbly. Severe: slopes Severe: slopes greater than 15 greater than 15 percent. percent. Slight: possible hazard Severe: rapid per- Slight .............. Slight .............. Rapid permeability; Low compressibility; of contaminating meability. 0 to 8 percent pervious when nearby ground water, slopes, compacted. Slight: 0 to 8 percent Severe: rapid per- Slight.: 0 to 8 per- Slight: 0 to 8 per- Rapid permeability; Low compressibility; slapes, meability; slopes cent slopes, cent slopes. 0 to 15 percent pervious when Moderate: 8 to 15 per- greater than 7 Moderate: 8 to 15 Moderate: 8 to 15 slopes, compacted. cent slopes; possible percent in places, percent slopes, peree,t slopes. hazard of contaminat- ing nearby ground water. 206 So,I Survey TABLE 15.--WATER FEATURES--Continued Flooding High water table** Soil na,r,e and Hydrotoglcl map symbol group Frequency Duration Months DepthI Kind ; Months 22 ...................... B Oe ea~ql, onal ...... Brief ......... Dee-Mar >6.0 --- None ............ 23, 24, 25 .............. A ...... >6.0 I --- i --- Hoypus None ............ /\ 26 ...................... B ...... >6.0 ...... Myas 27 ...................... B None .................. > 6.0 ...... Ilwaco 28*: ilwaco ................. B None .................. >6.0 ...... Klone .................. B 'None .................. >6.0 ...... 29, ~ B None .................. >6.0 ...... Klone 31'~ !'ion~ e .................. B None .................. >6.0 ...... Czette ................. C None .................. 3.0-4.0 iPerched Dec-Mar Tealwhit ............... D Rare .................. 0.5-1.0 iApparent Oct-May 32 ...................... D None .................. 0-2.0 iPerched Oct-Jul Kyda~a 3?: Kyfiaka .................. D None .................. 0-2.0 Perched g:t-ful Zecka .................. C None ............ ...... 1.5-3.0 Perched , ~ B None ............... > 6.0 ...... 3~ 35, ~6 ................. Loueiia 37 ...................... B None .................. >6.0 ...... Loueiia Variant 3~ ...................... D Rare .................. O. 5-2.0 )arent Oct-Jun L umm i 39, ~O .................. B None .................. >6.0 ...... Lyre 4~ B None ............ >6.0 , Makah 42 ...................... D None .................. +l-0.5 Perched Nov-Apr McKenna ' ~3 ...................... D None .................. +1-0 Apparent Oct-May Mu ki i ~e o 44, 45, 46 .............. A None .................. >6.0 I ...... Nellton I 47 ...................... C None .................. 3.0-4.0 Perched Dec-Mar Ozette 48': Ozette ................. C None .................. 3.0-4.0 Perched Dec-Mar Andeptic Udorthents .... B None .................. >6.0 ...... See footnotes at end of table. EROSION & SEDIMENT CONTROL Stormwater 51an' ' --" for the Puget Sound Basin STORMWATER MANAGEMENT M~uNUAL FOR THE PUGET SOUND BASIN CHAPTER I-2 MINIMUM REQUIRF-~4ENTS FOR ALL MEW DEVEIA)PM~NT AND REDEVELOPMENT I-2.1 INTRODUCTION The 1991 Puget Sound Water Quality Management Plan (as amended) requires all counties and cities within the Puget Sound drainage basin to adopt ordinances to control runoff from new development and redevelopment by July 1994. The Plan also directs local governments to adopt stormwater programs which include minimum requirements for new development and re-development set by the Plan and in guidance developed by Ecology. These ordinances are to address: "... at a minimum: (1) the control of off-site water quality and quantity (as related to quality) impacts; (2) the use of source control best management practices and treatment best management practices; (3) the effective treatment, using best management practices of the storm size and frequency (design storm) as specified in the manual for proposed development; (4) the use of infiltration, with appropriate precautions, as the first consideration in stormwater management; (5) the pro~ection of stream channels and wetlands; and (6) erosion and sedimentation control for new construction and re-development projects." This chapter has been developed in response to the direction in the Plan. The reader is also referred to Volume II of the "Stormwater Program Guidance Manual for The Puget Sound Basin" (hereafter referred to as the Guidance Manual), a companion to this technical manual, which contains a model ordinance that incorporates these Minimum Requirements. There are several sets of requirements for proposed new development and redevelopment that are applied depending on the type and size of the proposed development. In general, small sites are required to control erosion and sedimentation from construction activities while larger sites mus5 also provide permanent control of stormwater runoff. Sites being redeveloped must generally meet the same minimum requirements as new development sites for the portion of the site being redeveloped. In addition, redevelopment sites must provide source control BMPs for the entire site. There may also be situations in which additional controls are required for sites, regardless of type or size, as a result of basin plans or special water quality concerns. Development sites are to demonstrate compliance with the Minimum Requirements through the preparation of Stormwater Site Plans (SSP). The plans are described in detail in Chapter I-3 and in the Guidance Manual. Two major components of these plans are an Erosion and Sediment Control (ESC) Plan and a Permanent Stormwater Quality Control (PSQC) Plan. The ESC plan is intended to be temporary in nature to control pollution generated during the construction phase only, primarily erosion and sediment. The PSQC is intended to provide permanent BMPs for the control of pollution from stormwater runoff after construction has been completed. For small sites, this requirement is met by implementing a Small Parcel Erosion and Sediment Control Plan. A flow chart demonstrating these requirements is shown in Figure I-2.1. Definitions: New development - means the following activities: land disturbing activities, structural development, including construction, installation or expansion of a building or other structure; creation of impervious surfaces; Class IV - general forest practices that are conversions from timber land to other uses; I-2-1 FEBRUARY, 1992 STORMWATER MANAGEMENT MANUAL FOR THE PUGET SOUND BASIN and subdivision, short subdivision and binding site plans, as defined in Ch.58.17.020 RCW. All other forest practices and commercial agriculture are not considered new development. Redevelopment - means, on an already developed site, the creation or addition of impervious surfaces, structural development including construction, installation or expansion of a building or other structure, and/or replacement of impervious surface that is not part of a routine maintenance activity; and land disturbing activities associated with structural or impervious redevelopment. Impervious surface - means a hard surface area which either prevents or retards tho entry of water into the soil mantle as under natural conditions prior to development, and/or a hard surface area which causes water to run off the surface in greater quantities or at an increased rate of flow from the flow present under natural conditions prior to development. Common impervious surfaces include, but are not limited to, roof tops, walkways, patios, driveways, parking lots or storage areas, concrete or asphalt paving, gravel roads, packed earthen materials, and oiled, macadam or-other surfaces which similarly impede the natural infiltration of stormwater. Open, uncovered retention/detention facilities shall not be considered as impervious surfaces. Land disturbing activity - means any activity that results in a change in the existing soil cover (both vegetative and nonvegetative) and/or the existing soil topography. Land disturbing activities include, but are not limited to demolition, construction, clearing, grading, filling and excavation. Source control ~ - A B~{P that is intended to prevent pollutants from entering stormwater. A few examples of source control B~4Ps are erosion control practices, maintenance of stormwater facilities, constructing roofs over storage and working areas, and directing wash water and similar discharges to the sanitary sewer or a dead end sump. Throughout this Chapter, guidance to meet the requirements of the 1991Puge5 Sound Water Quality Management Plan (as amended) is written in bold and supplemental guidelines that serve as advice and other materials are not in bold. I-2.2 EIE~[PTIONS · Commercial agriculture, and forest practices regulated under Title 222 WAC, except for Class IV General forest practices that are conversions from timber land to other uses, are exempt from the provisions of the minimum requirements. All other new development is subject to the minimum requirements. I-2.3 SMAI~L PARCEL MINIMUM P~EQUIREMENTS · The following new development shall be required to control erosion and sediment during construction, to permanently stabilize soil exposed during construction, to comply with Small Parcel Requirements I through 4, and to prepare a Small Parcel Erosion and Sediment Control Plan: (a) Individual, detached, single family residences and duplexes. (b) Creation or addition of less than 5,000 square feet of impervious surface area. (c) Land disturbing activities of less than one acre. I-2-2 FEBRUARY, 1992 STORMWATER MANAGEMENT MANUAL FOR THE PUGET SOUND BASIN Preliminary results indicate that the major reason for BMP failure is poor maintenance. BMPs should be inspected regularly, particularly before, during, and after a major storm. Specific maintenance requirements of individual BMPs are dealt with in Chapter II-5. II-2.1.1 Problem Areas The remainder of this chapter will examine particular problem areas of the con- struction site (such as slopes or surface drainageways) and will describe which BMPs best alleviate problems associated with each area. The areas are: 1. Slopes 2. Streams and Waterways 3. Surface Drainageways 4. Enclosed Drainage Inlets and Outfalls 5. Large, Flat Surface Areas 6. Borrow Areas 7. Adjacent Properties A listing of the BMPs and the problem area, or areas, they are appropriate for, is presented as a uniform coding system in Table II-2.2 at the end of this chapter. This has been introduced to promote uniformity in the specification and presentation of BMPs on Erosion and Sedimentation Control (ESC) plans. Each BMP has been assigned a specific number, code and symbol. Assigned numbers should be used to identify BMPs in the narrative cr other written portions of the plan, while the practice symbol should be used to identify practices on the map or site plan. The BMP can be further defined to indicate whether it is proposed as a temporary or permanent measure by using the notation "t" or "p". For example SOp = permanent sodding; STt = temporary sediment trap. The practice symbols are based upon similar systems used in other states such as Virginia and Maryland. We hope that the system will become widely used so that ESC plans will become more uniform and understandable throughout the Puget Sound basin. Note: The American Society of Agricultural Engineers (ASAE) is proposing to standardize mapping sy~nbols for erosion and sediment control structures and practices. These symbols differ somewhat from those now in this manual, as they are based on another resource. Since those symbols are still in the discussion stage, we have chosen to continue to use the practice symbols found in the Virginia manual. II-2.2 SLOPES Slopes greatly increase the potential for erosion. As slope length and steepness increase, runoff velocity increases. This increases the capacity of water to detach and transport soil particles. Steeper slopes usually have faster runoff velocities, less infiltration and more erosion than less steep slopes. Modifying a slope by clearing existing vegetative cover also increases its vulnerability to erosion. Vegetation slows down runoff velocity and root systems hold soil particles in place. Vegetation maintains the soil's capacity to absorb precipitation. The following conditions indicate a need for special care when modifying or creating a slope: II-2-3 FEBRUARY, 1992 STOPdqWATER M3%NAGEMENT ~NUAL FOR THE PUGET SOUND BASIN DRAFT II-5.8 SEDIM~2~T RETEN~fION II-5.8.1 BMP E3.10: Filter Fence Code: ~ Symbol: ~ Definition A temporary sediment barrier consisting of a filter fabric stretched across and attached to supporting posts and entrenched. The filter fence is constructed of stakes and synthetic filter fabric with a rigid wire fence backing where necessary for support. Purpose 1. To intercept and detain small a3nounts of sediment under sheet flow conditions from disturbed areas during construction operations in order to prevent sediment from leaving the site. 2. To decrease the velocity of sheet flows. Conditions Where Practice Applies · Filter fences must be provided just upstream of the point(s) of discharge cf runoff from a site, before the flow becomes concentrated. They may also be required: 1. Below disturbed areas where runoff may occur in the form of sheet and ri erosion; wherever runoff has the potential to impact downstream resource 2. Perpendicular to minor swales or ditch lines for contributing drainage areas up to one acre in size. Advanuaqes · Downstream riparian areas will not be da~naged by sediment deposits originatin from the development. · Sediment will not cause damage to fish habitat. Disadvantaqes/Problems · Filter fences are not practical where large flows of water are involved, henc the need to restrict their use to drainage areas of one acre of less, and flc rates of less than 0.5 cfs. This flow should not be concentrated; it should spread out over many linear feet of filter fabric fence. · Problems may arise from incorrect selection of pore size and/or improper installation. · Filter fences should not be constructed in streams or used in V-shaped ditche They are not an adequate method of runoff control for anything deeper than sheet or overland flow. Planninq Considerations Laboratory work at the Virginia Highway and Transportation Research Council has shown that silt fences can trap a much higher percentage of suspended sediments th can straw bales. Silt fences are preferable to straw barriers in many cases. However, while the failure rate of silt fences is lower than that of straw barrier there are many instances locally in which silt fences have been improperly II-5-74 FEBRUARY, 1992 STORMWATER MA~NAGEMENT MANUAL FOR THE PUGET SOUND BASIN DRAFT ~nstalled. The installation methods outlined here can improve performance. Fabric Types: There are four types of material used for filter fabric fences; woven slit-film fabric, woven monofilament fabrics, woven composites (of differing materials) and non-woven heat-treated or needle punched fabrics. Slit-film fabrics are made from woven sheets of nonporous polymers. The sheets are very thin but are cut or slit in wider bands to form the threads which are then woven into the fabric. Since slit- film weaves use strands that are quite thin, the resulting woven fabric has little rigidity, and pore spaces are not uniform. Wire fencing must be used as a backing for this type of filter fabric fence. While ~his type of fabric is generally cheapest and the most widely used, the additional costs of the wire fence installation must be figured in. Woven monofilament fabrics are made from uniform spun or extruded filaments which are then woven to form ~he fabric. They are usually thicker and thus more rigid [~%an slit-film fabrics. The pores in monofilament fabrics are regularly spaced and ~ke increased rigidity offers more resistance to pore dis~tor~ion. The material has a very low flow-through rate. Woven composites are similar in structure but use mcre than one fiber type. Nc.T-woven fabrics are made by using either continuous filaments or short staple fibers. These fibers are then bonded together by various processes that can include a needling process that in[er~wines the fibers physically, or a uhermal or c.~emical bsnding operation ~hat fuses adjacenu fibers togecher. The resulting fabric has a random fiber orientation and may have a [hickness that ranges from thick felt to a reiacively thin fabric. King County Conservation Disur2c~ recently compleued tests on 18 differenu Cypes of fil~er fabrics. Their results have been incorporated into the design criteria. Desicn Criteria Drainage area of 1 acre or less or in combination with sediment basin in a larger site. · Maximum slope steepness (normal (perpendicular) to fence line) 1:!. · Maximum sheet or overland flow path length to the fence 100 feet. · No concentrated flows greater than 0.5 cfs. · Selection of a filter fabric is based on soil conditions at the construction site (which affect the apparent opening size (AOS) fabric specification) and characteristics of the support fence (which affect the choice of tensile s5rength). The designer shall specify a filter fabric that retains the soil found on the construction site yet will have openings large enough to permit drainage and prevent clogging. The larger the AOS number, the smaller the AOS size of the opening in the fabric. · The material used in a filter fabric fence must have sufficient strength to withstand various stress conditions and it also must have the ability to allow passage of water while retaining soil particles. The ability to pass flow through must be balanced with the material's ability to trap sediments. The following criteria are recommended for selection of the AOS: 1. Because of the properties of soils in the Puget Sound basin, field work must be done to determine the optimum AOS for filter fence installations. Because of glaciation, many soils in this area contain both cobbles and II-5-75 FEBRUARY, 1992 STORMWATER MANAGEMENT MJ~UAL FOR THE PUGET SOUND BASIN DRAFT fines. If an SCS standard soil description is used, (e.g. Alderwood gravelly sandy loam) the AOS specified will not be sufficient to trap t? f~ner particles of soil. Including 9ravels and larger sizes skews the results towards an AOS which is too small to capture suspended settleabl solids and reduce TSS. Monofilament and non-woven geotextiles must have minimum AOS of 70 when used in glacial soils. Composites and slit film fabrics must be extra-strength to perform similarly; in their case the ~ range may be from 40-60. In areas where Mazama ash is plentiful in the soil profile, a larger AOS will be necessary, or, fabric with an AOS of should be used for outwash soils. 2. For all other soil types, the AOS should be determined by first passing soil through a #10 sieve (2.0 mm). Based on the amount of the remaininc soil, by weight, which passes through a U.S. standard sieve No. 200, select the AOS to retain 85 percent of the soil. Where direct discharge to a stream, lake, or wetland will occur, then the ~OS shall be no large than Standard Sieve No. 100. Non-woven and regular strength slit film fabrics shall be supported wzth wire mesh. Filter fabric material shall contain ultraviolet ray inhibitors and stabilizers to provide a minimum of six months of expected usable constructic life at a temperature range of O°F. ~o !20°F. Standard Notes in addition to the Technical information Report (see Chapter I-3) required by the local goverm~ent when preparing an erosion and sediment control plan, add nhe following notes to the Filter Fabric Fence Detail (Figure !i-5.18): a. The filter fabric shall be purchased in a continuous roll cut to the length ~ the barrier to avoid use cf joints. When joints are necessary, filter c!cth shall be spliced together only at a support post, with a minimum 6 inch overlap, and both ends securely fastened to the post. b. Posts shall be spaced a maximum of 6 feen apart and driven securely into the ground a minimum of 30 inches (where physically possible). c. A trench shall be excavated approximately 8 inches wide and 12 inches deep along the line of posts and upslope from the barrier. The trench shall be constructed to follow the contour. d. When slit film filter fabric is used, a wire mesh support fence shall be fastened securely to the upslope side of the posts using heavy-duty wire staples at least 1 inch long, tie wires or hog rings. The wire shall extend into the trench a minimum of 4 inches and shall not extend more than 36 inchc above the original ground surface. e. Slit film filter fabric shall be wired to the fence, and 20 inches of the fabric shall extend into the trench. The fabric shall not extend more than 36 inches above the original ground surface. Filter fabric shall not be stapled to existing trees. Other types of fabric may be stapled to the fence f. When extra-strength or monofilament fabric and closer post spacing are used, the wire mesh support fence may be eliminated. In such a case, the filter fabric is stapled or wired directly to the posts with all other provisions of Standard Note "e" applying. Extra care should be used when joining or overlapping these stiffer fabrics. g. Local governments may specify the use of properly compacted native material. In many instances, this may be the preferred alternative because the soil fo~ a more continuous contact with the trench below, and use of native materials II-5-76 FEBRUARY, 1992 STORMWATER MANAGEMENT MANUAL FOR THE PUGET SOUND BASIN DRAFT cuts down on the number of trips that must be made on and off-site. If gravel is used instead, the trench shall be backfilled with ~-inch minimum diameter washed gravel. Care must be taken when using gravel to ensure good contact between the fabric and the trench bottom to prevent undercutting. h. Filter fabric fences shall be removed when they have served their useful purpose, but not before the upslope area has been permanently stabilized. Retained sediment must be removed and properly disposed of, or mulched and seeded. Maintenance · Inspect immediately after each rainfall, and at least daily during prolonged rainfall. Repair as necessary. · Sediment must be removed when it reaches approximately one third the height of the fence, especially if heavy rains are expected. · Any sediment deposits remaining in place after the filter fence is no !oncer required shall be dressed to conform with the existing grade, prepared an~ seeded. · All temporary erosion and sediment control measures shall be removed within 30 days after final site stabilization is achieved or after the temporary BMPs are no longer needed. Trapped sediment shall be removed or stabilized on site. Disturbed soil areas resulting from removal shall be permanently stabilized. References: (1) Kulzer, Louise, Considerations for Usinq Geotextiles in Silt Fencp Applications, Metro Technology Transfer Publication, Nov., 1988. (2) Varney, Dick, An Evaluation of Geotextiles as Filter Fabric Fence Usinq Local Soils for Planninq and Encineerinq, King County Ccnservasion District, Sept., 1991. (3) Varney, Dick, personal communication, March 4, 1992. II-5-77 FEBRUARY, 1992 STORMWATER MANAGEMENT MANUAL FOR THE PUGET SOUND BASIN DRAFT Figure II-5.18 Filter Fabric Fence Detail Filter fabric materiel in continuous rolls; Use staples or wire rings to attach fabric to wire / Wire mesh support fence for alit film fabric~ ~,'3 '" ' "'" Bury bottom of filter material " '~ ,~ in 8' by 12 trench ~ ..... ~ ................................... ~ ...... ', ', 6' Max. ,,, ' ~ 2' by 2' wood poets, standard or batter ~ _ ~-~ or equivalent W~rs mesh auppor~ fence for alit film fabric~ Provide washed gravel ~ ~'~ backfill or compacted native soil aa directed by local government Bury bottom of filter material-~-.-_~L~ 8" M~n in 8" by 12' trench 2' by 2" wood poets, standard or better or equivalent II-5-78 FEBRUARY, 1992 STORMWATER MANAGEMENT MANUAL FOR THE PUGET SOUND BASIN DRAFT 11-5.10 B~4PS FOR SM~?.Y. PARCELS A Small Parcel Stormwater Management Plan must be developed which satisfies the Small Parcel Minimum Requirements found in Volume II, Chapter II-2. These in turn may be satisfied by employing a suitable selection from the following list of BMPs. BMP ES.lO Planned Clearing and Grading. Plan and implement proper clearing and grading of the site. It is most important only to clear the areas needed, thus keeping exposed areas to a minimum. Phase clearing so that only those areas that are actively being worked are uncovered. Note: Clearinq limits should be flaqqed in the lot or area prior to initiatinq clearinq. BMP ES.20 Excavated Basement Soil Locate excavated basement soil a reasonable distance behind the curb, such as in the backyard or side yard area. This will increase the distance eroded soil must travel to reach the storm sewer system. Soil piles should be covered until the soil is either used or removed. Piles should be situated so that sediment does not run into the street or adjoining yards. BMP ES.30 Backfilling Backfill basement walls as soon as possible and rouqh grade the lot. This will eliminate large soil mounds which are highly erodible and prepares the lot for temporary cover which will further reduce erosion potential. BMP ES.40 Removal of Excess Soil Remove excess soil from the site as soon as pcssib!e after backfilling. This will eliminate any sediment loss frcm surplus fill. BMP ES.50 Management of Soil Banks If a lot has a soil bank higher than the curb, a trench or berm should be installed moving the bank several feet behind the curb. This will reduce the occurrence of gully and rill erosion while providing a storage and settling area for stormwater. BMP ES.60 Construction Road Access Apply gravel or crushed rock to the driveway area and restrict truck traffic to this one route. Driveway paving can be installed directly over the gravel. This measure will eliminate soil from adhering to tires and stops soil from washing into the street. This measure requires periodic inspection and maintenance including washing, top-dressing with additional stone, reworking and compaction. (For further details see BMP E2.10, Chapter II-5.7.1). BMP ES.70 Soil Stabilization Stabilize denuded areas of the site by mulching, seeding, planting, or sodding. For further details on standards and specifications, see BMPs No. El.lO, El.15, E1.35, El.40 in Chapter II-5. BMP ES.80 Street Cleaning Provide for periodic street cleaning to remove any sediment that may have been tracked out. Sediment should be removed by shovelling or sweeping and carefully -- removed to a suitable disposal area where it will not be re-eroded. II-5-105 FEBRUARY, 1992 STORMWATER MA/qAGEMENT MANUAL FOR THE PUGET SOUND BASIN DRAFT 11-5.11 REFERENCES (1) Goldman, Steven J., Erosion and Sediment Control Handbook, McGraw-Hill, 1986. (2) Horner, Richard R., Juno Guedry and Michael H. Kortenhof, Hiqhway Construction Site Erosion and Pollution Control Manual, Washington State Department of Transportation with the United States Department of Transportation Federal Highway Administration, WA-RD 200.2, January, 1990. (3)Metro, Summary of Preliminary Data Analysis - BMP Survey of Sinqle Family Residential Construction Sites, January, 1984. (4) Brady, Nile C., The Nature and Properties of Soils, Eighth Edition, MacMillan 1974. II-5-106 FEBRUARY, 1992