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Home My WebLink About08- Site PlanVICINITY MAP JOB NUMBER SHEET INDEX 9441 TP1 1 OF 3 T.E.S.C. & GRADING PLAN CAPE 111111110111111FIF I %—oqwl�ff SITE TP2 2 OF 3 NOTES & DETAILS GAE�ORGESEC 16 AND 17 TWN. 30 N. RNG. 1 W, W.M. ¢ � Rp TP3 3 OF 3 NOTES &DETAILS O JEFFERSON COUNTY WASHINGTON =" z 11 , FREDERI KS ST PARCEL NUMBERS (JEFFERSON COUNTY BLA REFERENCE NO'S: o w 001173011, 963601801, 963601701, 963602401, S' � 963602301, 963601301, 963601401, 963601901, 96360001, 96360 01, 9636001, 963600701, S�,J B2V-00018/MLA20-00152 j (n � u 963601001, 963600401, 963600801, 963600901, 0 963600301, 963600601, 963600101, 963600501, 963602201, 963602102, 963601601, 963601501, Q C� T.E.S.C. & GRADING PLAN w 0 963304102, 963304103, 963304101 SCALE: 1 "=100' 6 9 v N.T.S 0 50 100 200 U r-2' TYPICAL /-MIRAFI SILT FENCE 0 �( \- LIMITS OF CLEARING AND GRADING LOT LINE OR R/W LINE SILT FENCE LOCA110N DETAIL N.T.S. UTILITY CONFLICT NOTE CAUTION. THE CONTRACTOR SHALL BE FULLY RESPONSIBLE FOR VERIFYING THE LOCATION, AND DEPTH OF ALL EXISTING UTILITIES WHETHER SHOWN ON THESE PLANS OR NOT BY POTHOLING THE UTILITIES AND SURVEYING THE HORIZONTAL AND VERTICAL LOCATION PRIOR TO CONSTRUCTION. THIS SHALL INCLUDE CALLING UTILITY LOCATE ® 811 AND THEN POTHOLING ALL OF THE EXISTING UTILITIES AT LOCATIONS OF NEW UTILITY CROSSINGS TO PHYSICALLY VERIFY WHETHER OR NOT CONFLICTS EXIST. LOCATION OF SAID UTILITIES AS SHOWN ON THESE PLANS ARE BASED UPON THE UNVERIFIED PUBLIC INFORMATION AND ARE SUBJECT TO VARIATION. IF CONFLICTS SHOULD OCCUR, THE CONTRACTOR SHALL CONSULT THE PROJECT ENGINEER TO RESOLVE ALL PROBLEMS PRIOR TO PROCEEDING WITH CONSTRUCTION. CALL BEFORE YOU DIG THE CONTRACTOR SHALL BE FULLY RESPONSIBLE FOR THE LOCATION AND PROTECTION OF ALL EXISTING UTILITIES. THE CONTRACTOR SHALL VERIFY ALL UTILITY LOCATIONS PRIOR TO CONSTRUCTION BY CALLING THE UNDERGROUND LOCATE LINE AT 811 A MINIMUM OF 48 HOURS PRIOR TO ANY EXCAVATION. CONSTRUCTION NOTES: 1O CONTRACTOR TO CONSTRUCT CONSTRUCTION ENTRANCE AS SHOWN AND PER NOTES AND DETAIL ON SHEET 2. O2 INSTALL MIRAFI SILT FENCE PRIOR TO CONSTRUCTION AS SHOWN AND PER SILT FENCE LOCATION DETAIL ON THIS SHEET AND PER NOTES AND DETAIL ON SHEET 2. O3 IMMEDIATELY AFTER CONSTRUCTION, CONTRACTOR TO STABILIZE SLOPES BY ANY MEANS NECESSARY (I.E. SEEDING, SODDING, MULCHING, ETC.) PER NOTES LOCATED ON SHEET 2. 4O CONTRACTOR TO AMEND DISTURBED AREAS PER SOIL AMENDMENT NOTES(BMP T5.13) SHOWN ON SHEET 3. 0 O N Lo I 0 Lo VERTICAL DATUM U N (WSRN) Z NAVD 88 ESTABLISHED USING GPS RTK ROVER CL CONSTRAINED TO THE WASHINGTON STATE REFERENCE NETWORK (WSRN) STATIONS U O )N TOUR I N TER VAL = 2' Q00 POGRAPHY PREPARED BY LARSON & ASSOCIATES J �IORIZONTAL DATUM NAD 83111 WASHINGTON NORTH ZONE On Ld _ISHED USING GPS RTK ROVER CONSTRAINED TO THE mpg ¢ JGTON STATE REFERENCE NETWORK (WSRN) STATIONS U U Lu LEGEND z o z' PROPERTY LINE Lu Z I= O U 684 EXISTING CONTOUR O PROPERTY ADJOINER 0- U - - RIGHT OF WAY - ROW CENTERLINE - - - - - - - PROPOSED LANDING AREA CLEARING LIMITS MIRAFI SILT FENCE OP EXISTING OVERHEAD POWER Q) -0- EXISTING UTILITY POLE T --- EXISTING UNDERGROUND TELEPHONE �I 4 d- QT EXISTING TELEPHONE RISER Lo SD - EXISTING STORM DRAIN CULVERT Q � "� EXISTING MAILBOX d loll-fl- EXISTING SIGN 00 m EXISTING WATER VALVE CL EXISTING FIRE HYDRANT Z N oQ ® EXISTING WATER SERVICE METER °) O U �..•� S . M I D�j��,1� 0 j n Je z Q J 5 DA TE 31812021 DRAWING NO. TP1 9441 BASE SHEET 1 OF 3 EROSION CONTROL NOTES 1. ON -SITE EROSION CONTROL MEASURES SHALL BE THE RESPONSIBILITY OF THE DEVELOPER. ANY PROBLEMS OCCURRING BEFORE FINAL ACCEPTANCE OF THE STORM SYSTEM BY THE MUNICIPALITY SHALL BE CORRECTED BY THE APPLICANT AND/OR THE CONTRACTOR. 2. IN CASE EROSION OR SEDIMENTATION OCCURS TO ADJACENT PROPERTY, ALL CONSTRUCTION WORK WITHIN THE DEVELOPMENT THAT WILL AGGRAVATE THE SITUATION MUST CEASE AND THE APPLICANT/CONTRACTOR SHALL IMMEDIATELY COMMENCE RESTORATION OR MITIGATION MEASURES. RESTORATION ACTIVITY SHALL CONTINUE UNTIL SUCH TIME AS THE PROBLEM IS RECTIFIED. 3. ALL EROSION AND SEDIMENTATION CONTROL DEVICES SHOWN ON THIS DRAWING SHALL BE INSTALLED PRIOR TO OR AT THE FIRST STAGE OF SITE PREPARATION. 4. SHOULD THE TEMPORARY EROSION AND SEDIMENTATION CONTROL MEASURES AS SHOWN ON THIS DRAWING NOT PROVE ADEQUATE TO CONTROL EROSION AND SEDIMENTATION, THE APPLICANT/CONTRACTOR SHALL INSTALL ADDITIONAL FACILITIES AS NECESSARY TO PROTECT ADJACENT PROPERTIES, SENSITIVE AREAS, NATURAL WATER COURSES, AND/OR STORM DRAINAGE SYSTEMS. 5. IN ANY AREA WHICH HAS BEEN STRIPPED OF VEGETATION OR EXPERIENCED LAND DISTURBING ACTIVITIES AND WHERE NO FURTHER WORK IS ANTICIPATED FOR A PERIOD EXCEEDING THE LISTED CRITERIA, ALL DISTURBED AREAS MUST BE IMMEDIATELY STABILIZED WITH MULCHING, GRASS PLANTING, OR OTHER APPROVED EROSION CONTROL TREATMENT APPLICABLE TO THE TIME OF YEAR IN QUESTION. GRASS SEEDING ALONE WILL BE ACCEPTABLE ONLY DURING THE MONTHS OF APRIL THROUGH SEPTEMBER, INCLUSIVE. SEEDING MAY PROCEED, HOWEVER, WHENEVER IT IS IN THE INTEREST OF THE APPLICANT/CONTRACTOR, BUT MUST BE AUGMENTED WITH MULCHING, NETTING, OR OTHER TREATMENT. A. DRY SEASON(MAY I TO SEPTEMBER 30): LIMITS OF CLEARING EXTENDED TO ONLY ENOUGH LAND AS CAN RECEIVE APPROPRIATE PROTECTIVE COVER OR STABILIZATION BY NO LATER THAN SEPTEMBER 30. B. WET SEASON(OCTOBER 1 TO APRIL 30) 1. ALL CLEARED OR DISTURBED AREAS WILL RECEIVE APPROPRIATE COVER OR BE OTHERWISE STABILIZED WITHIN 5 DAYS IF NOT BEING ACTIVELY WORKED. 2. IF A MAJOR STORM EVENT IS PREDICTED, THE CLEARING OF LAND SHALL BE LIMITED TO ONLY AS MUCH LAND AREA AS CAN BE COVERED OR STABILIZED WITHIN 24 HOURS. 6. THE PROJECT ENGINEER OR PROJECT SURVEYOR WILL BE RESPONSIBLE FOR FIELD LOCATING THE CLEARING LIMITS AND ESTABLISHING THOSE BOUNDARIES WITH BRIGHT COLORED FLAGGING, THE CONTRACTOR SHALL CLEAR TO THE LIMITS AS ESTABLISHED ON THIS PLAN AND AS FLAGGED IN THE FIELD. 7. THE COUNTY SHALL BE RESPONSIBLE FOR THE INSPECTION AND ACCEPTANCE OF ALL CLEARING AND GRADING WORK AND EROSION AND SEDIMENTATION CONTROL FACILITIES. THE APPLICANT AND/OR CONTRACTOR SHALL NOTIFY THE COUNTY FORTY- EIGHT HOURS IN ADVANCE OF EACH REQUIRED EROSION AND SEDIMENT CONTROL INSPECTION. INSPECTION NO. 1 - INSTALLATION OF EROSION CONTROL FACILITIES/PRIOR TO CLEARING. INSPECTION NO. 2 - COMPLETION OF CLEARING. INSPECTION NO. 3 - UPON COMPLETION OF EXCAVATION, FILLING, AND EARTHWORK. INSPECTION NO, 4 - COMPLETION OF PROJECT. INSPECTION NO. 5 - AS NEEDED TO DETERMINE COMPLIANCE WITH APPROVED PLANS AND/OR SPECIFICATIONS. (DOES NOT REQUIRE ADVANCE NOTICE.) 8. ALL WORK ASSOCIATED WITH STABILIZING THE DISTURBED AREAS SHALL BE IN ACCORDANCE WITH THE PIERCE COUNTY STORMWATER MANAGEMENT MANUAL. 9. ALL NECESSARY FACILITIES SHALL BE MAINTAINED ON SITE TO PREVENT DEBRIS, DUST, AND MUD FROM ACCUMULATING ON THE PUBLIC RIGHT-OF-WAY GRADING NOTES 1. THE CONTRACTOR SHALL STRIP THE SURFACE ORGANIC MATERIAL WITHIN THE BUILDING AND LOT AREAS TO BE FILLED AND DISPOSE OF THE UNSUITABLE MATERIAL AS DIRECTED BY THE OWNER. 2. PRIOR TO THE PLACEMENT OF STRUCTURAL FILL OR BASE ROCK FOR THE BUILDING SITES, PAVED AREAS AND CONCRETE FLATWORK CORRIDORS, THE CONTRACTORS SHALL SCARIFY THE AREAS TO BE FILLED OR ROCKED TO A DEPTH OF 6 INCHES (6") MINIMUM. ONCE SCARIFIED, THE SOILS SHALL BE CONDITIONED TO THE PROPER MOISTURE CONTENT FOR COMPACTION AND COMPACTED TO AT LEAST NINETY-FIVE (957.) OF THE MAXIMUM DRY DENSITY, AS DETERMINED BY THE ASTM COMPACTION TEST PROCEDURE D-1557-70, VERIFY WITH SOILS ENGINEERS' RECOMMENDATIONS. 3. THE CONTRACTOR SHALL PLACE THE STRUCTURAL FILL MATERIAL IN EIGHT INCH (8') LOOSE LIFTS CONDITIONED TO THE PROPER MOISTURE CONTENT FOR COMPACTION AND COMPACTED TO AT LEAST NINETY-FIVE (95%) OF THE MAXIMUM DRY DENSITY, AS DETERMINED BY THE ASTM COMPACTION TEST PROCEDURE D-1557-70. 4. DETRIMENTAL AMOUNTS OF ORGANIC MATERIAL SHALL NOT BE PERMITTED IN FILLS. ALL IMPORTED MATERIAL SHALL BE IMPORTED GRAVEL "CLASS B" BANKRUN OR BETTER. 5. EXCAVATION STANDARDS. - CUT SLOPES: SLOPES SHALL BE NO STEEPER THAN IS SAFE FOR THE INTENDED USE AND SHALL NOT BE STEEPER THAN 2 HORIZONTAL TO 1 VERTICAL, OR AS RECOMMENDED BY A SOILS ENGINEER. THE CATCH POINT OF THE TOP OF THE SLOPE SHALL BE SETBACK FROM THE SITE BOUNDARY LINE IN ACCORDANCE WITH THE FOLLOWING TABLE UNLESS A RETAINING WALL IS DESIGNED BY THE ENGINEER AND CONSTRUCTED FOR THE PROJECT. CUT DEPTH SETBACK DISTANCE UNDER 5 FEET 2 FEET 5-20 FEET HEIGHT / 2 OVER 20 FEET 10 FEET 6. FlLL STANDARDS: 1. GENERAL: FILLS WHICH ARE INTENDED FOR BUILDING SITES SHALL BE CONSTRUCTED IN CONFORMANCE WITH THE REQUIREMENTS OF THE LATEST EDITION OF THE U.B.C., AS ADOPTED BY PIERCE COUNTY, AND AN ASSIGNMENT OF ALLOWABLE SOIL -BEARING PRESSURES WILL BE UNDER THE JURISDICTION OF THE PIERCE COUNTY BUILDING OFFICIAL IN ACCORDANCE WITH THE U.B.C. 2. FILL LOCATION: SLOPES SHALL BE NO STEEPER THAN IS SAFE FOR THE INTENDED USE AND SHALL NOT BE STEEPER THAN 1-1/2 HORIZONTAL TO 1 VERTICAL, OR AS RECOMMENDED BY A SOILS ENGINEER. FILL SITES MUST BE APPROVED BY THE ENGINEER AS SUITABLE LOCATIONS FOR THE PROPOSED FILL. 3. PREPARATION OF GROUND: THE GROUND SURFACE FOR FILLS OVER FIVE FEET IN HEIGHT SHALL BE PREPARED BY REMOVING VEGETATION, NONCOMPLYING FILL, TOPSOIL, AND OTHER UNSUITABLE MATERIALS; SCARIFYING TO PROVIDE A BOND WITH THE NEW FILL; AND, WHERE EXISTING SLOPES ARE STEEPER THAN 5 HORIZONTAL TO 1 VERTICAL, BY BENCHING INTO COMPETENT MATERIAL AS DETERMINED BY THE ENGINEER. THE BENCH UNDER THE TOE OF A FILL ON A SLOPE STEEPER THAN 5 HORIZONTAL TO 1 VERTICAL SHALL BE AT LEAST 10 FEET WIDE, OR AS RECOMMENDED BY A SOILS ENGINEER. 4. FILL MATERIAL: EXCEPT AS PERMITTED BY THE COUNTY, NO MATERIAL OTHER THAN EARTH MATERIAL SHALL BE BURIED OR PLACED IN FILLS. PLACEMENT OF OTHER THAN EARTH -MATERIAL 1S REGULATED BY STATE STATUTES OR FEDERAL LAWS, AND ADDITIONAL PERMITS MAY BE REQUIRED. 5. SLOPE STABILITY. • FILLS SHALL BE CONSTRUCTED USING EARTH MATERIALS, COMPACTION METHODS, AND CONSTRUCTION TECHNIQUES SO THAT STABLE FILLS ARE CREATED. 6. SETBACK FROM PROPERTY LINES: THE TOE OR CATCH POINT OF FILL SLOPES SHALL BE SET BACK FROM THE SITE BOUNDARY LINE IN ACCORDANCE WITH THE FOLLOWING TABLE UNLESS A RETAINING WALL IS DESIGNED BY THE ENGINEER AND CONSTRUCTED FOR THE PROJECT - FILL DEPTH SETBACK DISTANCE UNDER 5 FEET 2 FEET 5 - 40 FEET HEIGHT OF FILL/2 OVER 40 FEET 20 FEET GEOf�GE CAPE SEC 16 AND 17, TWN. 30 N., RNG. 1 W., W.M. JEFFERSON COUNTY, WASHINGTON (JEFFERSON COUNTY BLA REFERENCE NO'S: SU820-00018/MLA20-00152) SILT FENCE N O TES 1. FILTER FABRIC SHALL BE PURCHASED IN A CONTINUOUS ROLL AND CUT TO THE LENGTH OF THE BARRIER TO AVOID USE OF JOINTS. WHEN JOINTS ARE NECESSARY, FILTER CLOTH SHALL BE SPLICED TOGETHER ONLY AT A SUPPORT POST, WITH A MINIMUM 6-INCH OVERLAP, AND SECURELY FASTENED AT BOTH ENDS TO POSTS. 2. POSTS SHALL BE SPACED A MAXIMUM OF 6 FEET APART AND DRIVEN SECURELY INTO THE GROUND (MINIMUM OF 30 INCHES). 3. A TRENCH SHALL BE EXCAVATED APPROXIMATELY 8 INCHES WIDE AND 12 INCHES DEEP ALONG THE LINE OF POSTS AND UPSLOPE FROM THE BARRIER. THIS TRENCH SHALL BE BACKFILLED WITH WASHED GRAVEL. 4. WHEN STANDARD STRENGTH 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 24 INCHES ABOVE THE ORIGINAL GROUND SURFACE. 5. THE STANDARD STRENGTH FILTER FABRIC SHALL BE STAPLED OR WIRED TO THE FENCE, AND 20 INCHES OF THE FABRIC SHALL BE EXTENDED INTO THE TRENCH. THE FABRIC SHALL NOT EXTEND MORE THAN 24 INCHES ABOVE THE ORIGINAL GROUND SURFACE. FILTER FABRIC SHALL NOT BE STAPLED TO EXISTING TREES. 6. WHEN EXTRA -STRENGTH FILTER FABRIC AND CLOSER POST SPACING IS USED, THE WIRE MESH SUPPORT FENCE MAY BE ELIMINATED. IN SUCH CASE, THE FILTER FABRIC IS STAPLED OR WIRED DIRECTLY TO THE POSTS WITH ALL OTHER PROVISIONS OF ABOVE NOTES APPLYING. 7. FILTER FABRIC FENCES SHALL NOT BE REMOVED BEFORE THE UPSLOPE AREA HAS BEEN PERMANENTLY STABILIZED. 8. FILTER FABRIC FENCES SHALL BE INSPECTED IMMEDIATELY AFTER EACH RAINFALL AND AT LEAST DAILY DURING PROLONGED RAINFALL. ANY REQUIRED REPAIRS SHALL BE MADE IMMEDIATELY. 9. SILT FENCES WILL BE INSTALLED PARALLEL TO ANY SLOPE CONTOURS. 10. CONTRIBUTING LENGTH TO FENCE WILL NOT BE GREATER THAN 100 FEET. 11. DO NOT INSTALL BELOW AN OUTLET PIPE OR WEIR. 12. INSTALL DOWNSLOPE OF EXPOSED AREAS. 13. DO NOT DRIVE OVER OR FILL OVER SILT FENCES. SOD NO TES 1. SOD SHALL BE MACHINE CUT AT A UNIFORM SOIL THICKNESS OF 3/4-INCH AT THE TIME OF CUTTING. MEASUREMENT FOR THICKNESS SHALL EXCLUDE TOP GROWTH AND THATCH. 2. STANDARD SIZE SECTIONS OF SOD SHALL BE STRONG ENOUGH TO SUPPORT THEIR OWN WEIGHT AND RETAIN THEIR SIZE AND SHAPE WHEN SUSPENDED BY THE END OF A 3 FOOT SECTION. 3. SOD SHALL NOT BE HARVESTED OR TRANSPLANTED WHEN MOISTURE CONTENT (EXCESSIVELY DRY OR WET) MAY ADVERSELY AFFECT ITS SURVIVAL. 4. SOD SHALL BE HARVESTED, DELIVERED AND INSTALLED WITHIN A PERIOD OF 36 HOURS. STOCKPILE NOTES 1. STOCKPILES SHALL BE STABILIZED (WITH PLASTIC COVERINGS OR OTHER APPROVED DEVICE) DAILY BETWEEN NOVEMBER 1 AND MARCH 31. 2. IN ANY SEASON, SEDIMENT LEACHING FROM STOCK PILES MUST BE PREVENTED. 3. TOPSOIL SHALL NOT BE PLACED WHILE IN A FROZEN OR MUDDY CONDITION, WHEN THE SUBGRADE IS EXCESSIVELY WET, OR WHEN CONDITIONS EXIST THAT MAY OTHERWISE BE DETRIMENTAL TO PROPER GRADING OR PROPOSED SODDING OR SEEDING. 4. PREVIOUSLY ESTABLISHED GRADES ON THE AREAS TO BE TOPSOILED SHALL BE MAINTAINED ACCORDING TO THE APPROVED PLAN. SEEDING N 0 TES 1. SEED MIXTURE SHALL BE 107oRED TOP, 40% ANNUAL RYE, 40% CHEWING FESCUE, 10% WHITE DUTCH CLOVER, AND SHALL BE APPLIED AT THE RATE OF 225 LBS. PER ACRE. 2. SEED BEDS PLANTED BETWEEN MAY 1 AND OCTOBER 31 WILL REQUIRE IRRIGATION AND OTHER MAINTENANCE AS NECESSARY TO FOSTER AND PROTECT THE ROOT STRUCTURE. 3. FOR SEED BEDS PLANTED BETWEEN OCTOBER 31 AND APRIL 30, ARMORING OF THE SEED BED WILL BE NECESSARY. (E.G., GEOTEXTILES, JUTE MAT, CLEAR PLASTIC COVERING). 4. BEFORE SEEDING, INSTALL NEEDED SURFACE RUNOFF CONTROL MEASURES SUCH AS GRADIENT TERRACES, INTERCEPTOR DIKES, SWALES, LEVEL SPREADERS AND SEDIMENT BASINS. 5. THE SEEDBED SHALL BE FIRM WITH A FAIRLY FINE SURFACE, FOLLOWING SURFACE ROUGHENING. PERFORM ALL OPERATIONS ACROSS OR AT RIGHT ANGLES TO THE SLOPE. 6. FERTILIZERS ARE TO BE USED ACCORDING TO SUPPLIERS RECOMMENDATIONS. AMOUNTS USED SHOULD BE MINIMIZED, ESPECIALLY ADJACENT TO WATER BODIES AND WETLANDS. CONSTRUCTION ENTRANCE NOTES 1. MATERIAL SHALL BE 4 INCH TO 8 INCH QUARRY SPALLS (4 TO 6 INCH FOR RESIDENTIAL SINGLE FAMILY LOTS) AND MAY BE TOP -DRESSED WITH 1 INCH TO 3 INCH ROCK. (STATE STANDARD SPECIFICATIONS, SECTION 8-15). 2. THE ROCK PAD SHALL BE AT LEAST 12 INCHES THICK AND 50 FEET LONG (20 FEET FOR SITES WITH LESS THAN 1 ACRE OF DISTURBED SOIL). WIDTH SHALL BE THE FULL WIDTH OF THE VEHICLE INGRESS AND EGRESS AREA. SMALLER PADS MAY BE APPROVED FOR SINGLE-FAMILY RESIDENTIAL AND SMALL COMMERCIAL SITES, 3. ADDITIONAL ROCK SHALL BE ADDED PERIODICALLY TO MAINTAIN PROPER FUNCTION OF THE PAD. 4. IF THE PAD DOES NOT ADEQUATELY REMOVE THE MUD FROM THE VEHICLE WHEELS, THE WHEELS SHALL BE HOSED OFF BEFORE THE VEHICLE ENTERS A PAVED STREET. THE WASHING SHALL BE DONE ON AN AREA COVERED WITH CRUSHED ROCK AND WASH WATER SHALL DRAIN TO A SEDIMENT RETENTION FACILITY OR THROUGH A SILT FENCE. I is FILTER FABRIC MATERIAL IN CONTINUOUS ROLLS USE STAPLES OR WIRE RINGS TO ATTACH FABRIC TO WIRE WIRE MESH SUPPORT FENCE FOR FILTER FABRIC BURY BOTTOM GROUND SURFACE OF FILTER MATERIAL IN 8"x12" TRENCH 6' MAX. u 2"x2" WOOD POSTS. STANDARD OR BETTER OR EQUIVALENT WIRE MESH SUPPORT FENCE (TO BE LOCATED ON THE DOWNHILL SIDE OF THE FILTER FABRIC) FILTER FABRIC MATERIAL N \ BACKFILL TRENCH WITH - NATIVE SOIL OR 3/4"-1.5" WASHED GRAVEL �g" IN. BURY BOTTOM OF FILTER MATERIAL IN 8"x12" TRENCH c0 0 I N 0 Lo 2"x2%5' WOOD POSTS. STANDARD OR BETTER FILTER FABRIC FENCE DETAIL OR EQUIVALENT N.T.S. APO 10� F qS TOC�A��QC' 1 A; o �� oSF��ti Scl Oo� O" SO, yc FSC�`O O 0 pp D� _ pN'1n� R = 25' MIN. 12" MIN. DEPTH --/ 1\ (6"MIN. FOR RESIDENTIAL SINGLE FAMILY LOTS) 4" TO 8" QUARRY SPALLS - (4" TO 6" FOR RESIDENTIAL SINGLE FAMILY LOTS) PROVIDE FULL WIDTH OF INGRESS/EGRESS AREA _j CONSTRUCTION ENTRANCE ROCK PAD N.T.S. NUMBER 9441 co LLI v- `r I ~� V� jLo Q w� 00 U00 Urn N N O Q rn d U g J Q W Z Q y / •• S.MIDD lot dw ar AV % �i Q 1 / Q ,0'ISTE?�'��1� � K��• DA TE 31812021 DRAWING TP2 11 9441 BASE T2.OF� BMP T5.13: Post -Construction Soil Quality and Depth Purpose and Naturally occurring (undisturbed) soil and vegetation provide important CAPE nFO?nF NUMBER 9441 Definition stormwater functions including: water infiltration; nutrient, sediment, and pollutant adsorption; sediment and pollutant biofiltration; water interflow storage and transmission; and pollutant decomposition. These functions are largely lost when development strips away native soil and vegetation and replaces it with minimal topsoil and sod. Not only are these important stormwater functions lost, but such landscapes themselves become pollution generating pervious surfaces due to increased use of pesticides, fertilizers and other landscaping and household/industrial chemicals, the concentration of pet wastes, and pollutants that accompany roadside litter, Establishing soil quality and depth regains greater stormwater functions in the post development landscape, provides increased treatment of pollutants and sediments that result from development and habitation, and minimizes the need for some landscaping chemicals, thus reducing pollution through prevention. Applications and Establishing a minimum soil quality and depth is not the same as Limitations preservation of naturally occurring soil and vegetation. However, establishing a minimum soil quality and depth will provide improved on - site management of stormwater flow and water quality. Soil organicmatter can be attained through numerous materials such as compost, composted woody material, biosolids, and forest product residuals. It is important that the materials used to meet the soil quality and depth BMP be appropriate and beneficial to the plant cover to be established. Likewise, it is important that imported topsoils improve soil conditions and do not have an excessive percent of clay fines. This BMP can be considered infeasible on till soil slopes greater than 33 percent. Design Soil retention. Retain, in an undisturbed state, the duff layer and Guidelines native topsoil to the maximum extent practicable. In any areas requiring grading remove and stockpile the duff layer and topsoil on site in a designated, controlled area, not adjacent to public resources and critical areas, to be reapplied to other portions of the site where feasible. • Soil quality. All areas subject to clearing and grading that have not been covered by impervious surface, incorporated into a drainage facility or engineered as structural fill or slope shall, at project completion, demonstrate the following: 1. A topsoil layer with a minimum organic matter content of 10% dry weight in planting beds, and 5% organic matter content in turf areas, and a pH from 6.0 to 8.0 or matching the pH of the undisturbed soil. The topsoil layer shall have a minimum depth of eight inches except where tree roots limit the depth of incorporation of amendments needed to meet the criteria. Subsoils below the topsoil layer should be scarified at least 4 inches with some incorporation of the upper material to avoid stratified layers, where feasible. 2. Mulch planting beds with 2 inches of organic material 3. Use compost and other materials that meet these organic content requirements: a. The organic content for "pre -approved" amendment rates can be met only using compost meeting the compost specification for Bioretention (BMP T7.30), with the exception that the compost may have up to 35% biosolids or manure. The compost must also have an organic matter content of 40% to 65%, and a carbon to nitrogen ratio below 25:1. The carbon to nitrogen ratio may be as high as 35:1 for plantings composed entirely of plants native to the Puget Sound Lowlands region. b. Calculated amendment rates may be met through use of composted material meeting (a.) above; or other organic materials amended to meet the carbon to nitrogen ratio requirements, and not exceeding the contaminant limits identified in Table 220-13, Testing Parameters, in WAC 173- 350-220. The resulting soil should be conducive to the type of vegetation to be established. • Implementation Options: The soil quality design guidelines listed above can be met by using one of the methods listed below: 1. Leave undisturbed native vegetation and soil, and protect from compaction during construction, 2. Amend existing site topsoil or subsoil either at default "pre - approved" rates, or at custom calculated rates based on tests of the soil and amendment. 3. Stockpile existing topsoil during grading, and replace it prior to planting. Stockpiled topsoil must also be amended if needed to meet the organic matter or depth requirements, either at a default "pre -approved" rate or at a custom calculated rate. 4. Import topsoil mix of sufficient organic content and depth to meet the requirements. More than one method may be used on different portions of the same site. Soil that already meets the depth and organic matter quality standards, and is not compacted, does not need to be amended. Planning/Permitt Local governments are encouraged to adopt guidelines and ing/Inspection/Ve procedures similar to those recommended in Guidelines and rification Resources For Implementing Soil Quality and Depth BMP T5.13 in Guidelines & WDOE Stormwater Management Manual for Western Washington, Procedures This document is available at: http://www.soilsforsalmon.orgZpdf/Soil BMP Manual.pdf Maintenance • Establish soil quality and depth toward the end of construction and once established, protect from compaction, such as from large machinery use, and from erosion. • Plant vegetation and mulch the amended soil area after installation. • Leave plant debris or its equivalent on the soil surface to replenish organic matter. • Reduce and adjust, where possible, the use of irrigation, fertilizers, herbicides and pesticides, rather than continuing to implement formerly established practices. Runoff Model Areas meeting the design guidelines may be entered into approved runoff Representation models as "Pasture" rather than "Lawn." Flow reduction credits can be taken in runoff modeling when BMP T5.13 is used as part of a dispersion design under the conditions described in: BMP T5.1 OB Downspout Dispersion BMP T5.11 Concentrated Flow Dispersion BMP T5.12 Sheet Flow Dispersion BMP T5.18 Reverse Slope Sidewalks BMP T5.30 Full Dispersion (for public road projects) MULCH with visible dark organic matter Figure 5.3.3 — Planting bed Cross -Section (Reprinted from Guidelines and Resources For Implementing Soil Quality and Depth BMP T5.13 in WDOE Stormwater Management Manual for Western Washington, 2010, Washington Organic Recycling Council) SEC 16 AND 17, TWN. 30 N•, RNG. 1 W., W.M. JJEFFERSON COUNTY, WASHINGTON (JEFFERSON COUNTY BLA REFERENCE NO'S: S UB20-00018/MLA20-00152) �.�►� 3 . M I DD1lI i OF ASI�; Al 0 so •,,I o�' ' ZONAL Z W Z O tL O CL O O N i O U) O N -J J Z ¢ CL O O co ¢ J Q nn O�W QD Sc t W CL O ¢ U tL l� U Ld ti C.) Z O (3 co d- o I 46 V)Nt �LO Q W� C 00 ti00 U rn tL ¢ Zt. ^ N O q zi O v ti Q w 0 0 z Q DA TE 31812021 DRAWING NO. TP3 9441 BASE SHEET 3 OF 3