HomeMy WebLinkAboutBLD2013-00135 Stormwater I
I ¢gON c
w4� °%1, JEFFERSON COUNTY
0
-3 4 DEPARTMENT OF COMMUNITY DEVELOPMENT
621 Sheridan Street • Port Townsend • Washington 98368
' yS, NGee O 360/379-4450 • 360/379-4451 Fax
http://www.co.jefferson.wa.us/commdevelopment/
STORMWATER SITE PLAN SUBMITTAL TEMPLATE
1
MLA# PROJECT/APPLICANT NAME: Robert and Fran Heinith
Please answer all of the following questions to the best of your ability. Where the question calls for depiction on a site map, the
applicant may choose to either incorporate the elements into the general plot plan for the Master Land Use Application or to submit a
separate stormwater site plan map.
Project Overview
' 1. Describe the proposed developed conditions of the site. Indicate position and relative size of proposed improvements on the
site map.
The proposed development includes the construction of a single-family residence,
garage/shop and a bathhouse on a 5.01-area parcel
Existing Conditions Summary
2. Describe the existing topography. Indicate contours on the site map.
The site slope is parcel slope ranges between 10%and 50%site slopes moderately at 1-3%
3. Describe the existing vegetation. Indicate native vegetation areas on the site map.
Parcel has a mix of indigenous mature trees, understory vegetation and grasses. Building site(s)are
generally cleared except for grasses and weeds.
4. Describe the existing soils. Indicate soil type on the site map.
' Cassolary sandy loam (CfD), Hoypus gravelly loamy sand (HuD),and Tukey gravelly loam (TuD)
' 5. Describe the existing site hydrology(i.e., drainage; behavior of water on the site—above, below, and on the ground). Indicate
existing stormwater drainage to and from the site on the site map. Depict separate drainage basins on the site map, if
applicable, and indicate acreage of each.
Stormwater infiltrates; no indications of seeps or perched water was observed.
' 6. Describe any excess levels of noise generated by the proposed use or activity:
It is anticipated that noise levels typical of a residential construction site will be present during building
activities.
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stormwater site plan template doc-rev 10/12/2003 5
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1
13. Describe the water quality system.
Runoff from driveway and parking areas will be bio-retained in vegetation and forest duff.
14. Describe the conveyance system analysis and design.
Roof downspouts convey runoff via closed conduit(4" roof leaders and 6-inch PVC)to a organic
debris trap then to a standard drywell
15. Describe the source of fill material, physical characteristics of fill material, and depositionofex
cess p material.
Import sand and gravel as needed under footings and structures;and crushed surfacing will be
' imported for drives and parking areas.
16. Proposed methods of placement and compaction consistent with the applicable standards on Appendix Chapter 33 of the
Uniform Building Code.
A backhoe with front end loader will be used for earthwork. A small vibratory compactor will
' be used to where materials required compaction.
17. Describe the proposed surfacing material.
Crushed surfacing will be used for driveway and parking area surfacing.
18. Describe methods for restoration of the site.
Owner/contractor will be required to provide final stabilization of all disturbed areas. This will
' include seeding and mulching along with the placement of gravel surfacing. Disturbed areas within
buffers will be temporarily seeded and then left along to be repopulated with indigenous plants
naturally.
' 19. An Operation and Maintenance Manual is required for each flow control and treatment facility. [This is normally required for
"large"projects only and only those for which facilities are required to control flow or treat runoff.] If included, list the Manuals
here.
i
N/A
20. List here and include any special reports or studies conducted to prepare the Stormwater Site Plan.
The adequacy of the on-site soils was determined through review of OSS soil profiles,field
observations and with the use the web based NRCS Soil Survey
21. List other necessary permits and approvals as required by other regulatory agencies. If those permits or approvals include
conditions that affect the drainage plan or contain more restrictive drainage-related requirements, describe those conditions or
restrictions here.
' A Geotechnical Report was submitted and approved for the site.The recommendations provided
in that report are incorporated where applicable.
stormwater site plan template.doc-rev.10/12/2003 7
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12 Required Elements-Construction SWPPP(continued)
8. Stabilize Channels and Outlets.
N/A
9. Control Pollutants.
Given the small size of the project,only minor drips that are normal to the equipment are expected.
Contractor/operator will be responsible for maintaining a clean site.
10. Control De-Watering(the act of pumping groundwater or stormwater away from an active construction site).
De-watering will be required.
11. Maintain Best Management Practices(BMPs).
Appropriate BMP's are incorporated into site plans and details.
' 12. Manage the Project.
The project will be managed jointly by the owner and contractor.
2. Adjacent Areas.
a. Description of the adjacent areas that may be affected by site disturbance (e.g., streams, lakes, wetlands, residential
areas, roads).
' The site is well isolated with vegetated strips/forest between the work and off-site/critical areas
and appropriate BMP's are to be used; no or negligible affects are expected.
' b. Description of the downstream drainage path leading from the site to the receiving body of water(minimum distance of 400
yards).
The the parcel has 2 flow paths:One is northward to a old logging road then to a wooded undisturbed
ravine that flows westward approximately 700-ft through an undeveloped parcel and discharges to
Discovery Bay.The other is southwestward through approx 230-ft of forest duff on a developed
single-family parcel,then dispersed and through an undeveloped forested parcel to Discovery Bay.
' 3. Environmentally Sensitive Areas.
a. Description of environmentally sensitive areas that are on or adjacent to the site.
I The site,-'peg tfie'Jeff irsori Count map server,is located In'The folfowirig areas: Coastal Seawater
Intrusion ro ion one, n ica qui r ec arge rea, ore me ope a i rea uns e
and stable), and in a Landslide and Erosion Geologically Hazardous Areas. a server a so erroneou ly
shows a Type"Ns"stream owwing the parcel. Please see Ross Goodwin (WA DNR) letter dated
_ 8/29/05 in Appendix G and/or MLA07-00467 Jefferson County DCD.
stormwater site plan template.doc-rev.10/12/2003 9
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SECTION II—EROSION AND SEDIMENT CONTROL PLAN
Sediment and erosion control measures may be depicted on the master land use application plot plan, a stormwater site plan,and/or a
separate Construction SWPPP site plan. This is a checklist to ensure that the following are depicted on a site plan:
1. General.
a Vicinity Map
b. Jefferson County Approval Block
c. Erosion and Sediment Control Notes
' 2. Site Plan.
a. Legal description of subject property.
b. North arrow.
c. Indicate boundaries of existing vegetation(e.g.,tree lines, pasture areas,etc.).
d. Identify and label areas of potential erosion problems.
e. Identify FEMA base flood boundaries and Shoreline Management boundaries(if applicable).
f. Show existing and proposed contours.
' g. Indicate drainage basins and direction of flow for individual drainage areas.
h. Label final grade contours and identify developed condition drainage basins.
i. Delineate areas that are to be cleared and graded.
j. Show all cut and fill slopes indicating top and bottom of slope catch lines.
1 3. Conveyance Systems.
a. Designate locations for swales, interceptor trenches, or ditches.
b. Show all temporary and permanent drainage pipes,ditches, or cut-off trenches required for erosion&sediment control.
c. Provide minimum slope and cover for all temporary pipes or call out pipe inverts.
d. Shows grades,dimensions,and direction of flow in all ditches,swales, culverts and pipes.
e. Provide details for bypassing off-site runoff around disturbed areas.
' f. Indicate locations and outlets of any dewatering systems.
4. Location of Detention Best Management Practices(BMPs). Identify location of detention BMPs.
5. Erosion and Sediment Control Facilities.
' a. Show the locations of sediment trap(s), pond(s), pipes and structures.
b. Dimension pond berm widths and inside and outside pond slopes.
c. Indicate the trap/pond storage required and the depth, length, and width dimensions.
' d. Provide typical section views through pond and outlet structure.
e. Provide typical details of gravel cone and standpipe, and/or other filtering devices.
f. Detail stabilization techniques for outlet/inlet.
g. Detail control/restrictor device location and details.
h. Specify mulch and/or recommended cover of berms and slopes.
i. Provide rock specifications and detail for rock check dam(s), if applicable.
j. Specify spacing for rock check dams as required.
' k. Provide front and side sections of typical rock check dams.
I. Indicate the locations and provide details and specifications for silt fabric.
m. Locate the construction entrance and provide a detail.
6. Detailed Drawings. Any structural practices used that are not referenced in the Ecology Manual should be explained and
illustrated with detailed drawings.
7. Other Pollutant BMPs. Indicate on the site plan the locations of BMPs to be used for the control of pollutants other than
sediment(e.g., concrete wash water).
t8. Monitoring Locations. Indicate on the site plan the water quality sampling locations to be used for monitoring water quality on
the construction site. Sampling stations should be located upstream and downstream of the project site.
stormwater site plan template.doc-rev.10/12/2003 11
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� APPENDIX B
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I SON
beV JEFFERSON COUNTY
IDEPARTMENT OF COMMUNITY DEVELOPMENT
621 Sheridan Street• Port Townsend •Washington 98368
$ °14:41NO`s 360/379-4450 . 360/379-4451 Fax
I http://www.co.jefferson.wa.us/commdevelopment/
IStormwater Calculation Worksheet
MLA# PROJECT/APPLICANT NAME: Robert and Fran Heinith
IDETERMINING STORMWATER MANAGEMENT REQUIREMENTS:This stormwater calculation worksheet should be completed first
to classify the proposal as"small,""medium,"or large." The size determines whether a Stormwater Site Plan is required in conjunction
I with a stand-alone stormwater management permit application, building permit application, or other land use approval application that
involves stormwater review. The basic information will also be helpful for completing a Stormwater Site Plan,if required.
PARCEL SIZE(I.E.,SITE)
I Size of parcel 5.01 acres An acre contains 43,560 square feet. Multiply the acreage by this figure.
Size of parcel in square feet 218,445 sq/ft
I
Land-disturbing activity is any activity that results in movement of earth, or a change in the existing soil cover(both vegetative and
I non-vegetative) and/or the existing soil topography. Land disturbing activities include, but are not limited to clearing, grading, filling,
excavation,and compaction associated with stabilization of structures and road construction.
Native vegetation is vegetation comprised on plant species,other than noxious weeds,that are indigenous to the coastal region of the
I Pacific Northwest and which reasonably could have been expected to naturally occur on the site. Examples include species such as
Douglas fir,western hemlock,western red cedar,alder,big-leaf maple,and vine maple;shrubs such as willow,elderberry,salmonberry,
and salal;herbaceous plants such as sword fern,foam flower,and fireweed.
ILAND DISTURBING ACTIVITY,CONVERSION OF NATIVE VEGETATION,AND VOLUME OF CUT/FILL
Calculate the total area to be cleared,graded,filled, Answer the following two questions related to
excavated,and/or compacted for proposed development conversion of native vegetation:
I project. Include in this calculation the area to be cleared for:
4964 Does the project convert Y.acres or more of
Construction site for structures sq/ft native vegetation to lawn or landscaped areas?
IDrainfield,septic tank,etc. sq/ft Circle: Yes No)
Well,utilities,etc. sq/ft Does the project convert 2%acres or more of
native vegetation to pasture?
1 Driveway, parking,roads,etc. 2105 sq/ft
6950 Circle: Yes �No)
Lawn,landscaping,etc. sq/ft
IOther compacted surface,etc. sq/ft Indicate Total Volumes of Proposed:
Total Land Disturbance 17019 sq/ft Cut 40 Fill 60 (culyd)
I [over]
Istormwater caic worksheet-REV.2/20/2008
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1 Impervious surface is a hard surface that either prevents or retards the entry of water into the soil mantle as under natural
conditions
prior to development. A hard surface area which causes water to run off the surface in greater quantities or at an increased rate flow
Ifrom 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.
ISTORMWATER CALULATIONS—IMPERVIOUS SURFACE
NEW EXISTING
IStructures(all roof area) 4964 sq/ft Structures(all roof area) sq/ft
Sidewalks sq/ft Sidewalks sq/ft
I
Patios sq/ft Patios sq/ft
Solid Decks sq/ft Solid Decks sq/ft
(without infiltration below) (without infiltration below)
IDriveway,parking,roads,etc 7150 sq/ft Driveway,parking,roads,etc q 2573 s /ft
Other sq/ft Other sq/ft
Total New 9541 sq/ft Total Existing 2573 sq/ft
TOTAL NEW+TOTAL EXISTING* 12114
sq/ft "This amount will be used to check total lot coverage.
The following questions will help determine whether the proposed project is considered development or redevelopment.p e opment.
IDEVELOPMENT v.REDEVELOPMENT
Divide the total existing impervious surface above by the size of the parcel and convert to a percentage: 16 %
Does the site have 35%or more of existing impervious surface? Circle: Yes (No)
FURTHER INSTRUCTIONS: If the answer is yes, the proposal is considered redevelopment and the attached Figure 2 should be
I used to determine the applicable Minimum Requirements. If the answer is no, the proposal is considered new development and the
attached Figure 1 should be used. At this juncture,the applicant should refer to the applicable Flow Chart to determine the Minimum
Requirements for stormwater management. DCD staff will help verify the classification of the project and the application requirements.
For proponents of "small" projects who must comply only with Minimum Requirement #2—Construction Stormwater Pollution
I Prevention—an additional submittal is not required. The proponent is responsible for employing the 12 Elements to control erosion and
prevent sediment and other pollutants from leaving the site during the construction phase of the project. Pick up the Construction
Stormwater Pollution Prevention (SWPP) Best Management Practices (BMPs) Packet. Proponents of"medium"projects—those
that must meet only Minimum Requirements #1 through #5—and for large" projects—those that must meet all 10 Minimum
I Requirements—are required to submit a Stormwater Site Plan. DCD has prepared a submittal template of a Stormwater Site Plan,
principally for rural residential projects. Complete the template in the Stormwater Site Plan Instructions and Submittal Template or
prepare a Stormwater Site Plan using the step-by-step guidance in the Stormwater Management Manual.
APPLICANT SIGNATURE
I
By signing the Stormwater Calculation Worksheet, I as the applicant/owner attest that the information provided herein is true and
correct to the best of my knowledge. I also certify that this application is being made with the full knowledge and consent of all
Iowners of the affected property.
10/4/2012
(LANDOWNER OR AUTHORIZED REPRESENTATiSIGNATURE) (DATE)
I
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41' , 'Fc..Likts r i xts6,,--'7(k ;ia;....,.P ,s19 ti l • a.1 -" . °di7LT,,.__? ' t.t.: __..,.,.z ?r,. __._tl fil
I stormwater calc worksheet-REV.2/20/2008
2
� APPENDIX C
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FIGURE 1 : NEW DEVELOPMENT
IStart Here
IDoes the site have Yes
See Redevelopment
35% or more of Minimum
Iexisting impervious Requirements and
coverage? Flow Chart
(Figure 2)
I
No Does the project convert 3/4
acres or more of native
vegetation to lawn or
I Does the project add 5,000 square feet or Nob. landscaped areas, or
convert 2.5 acres or more
more of new of native vegetation to
I
impervious surfaces? pasture?
65 Yes No
I
Does the project have
♦
2,000 square feet or
I
"LARGE" PROJECT more of new, replaced,
All Minimum Requirements or new plus replaced
apply to the new impervious impervious surfaces?
surfaces and converted
Ipervious surfaces. Yes No
•
I "MEDIUM" PROJECT Does the project have
Minimum Requirements #1 land-disturbing
through #5 apply to the new I f Yes activities of 7,000
and replaced impervious square feet or more?
surfaces and the land
disturbed. No I
"SMALL" PROJECT
I See Minimum
Requirement#2,
Construction Stormwater
I
Pollution Prevention
I
IBased on Fig.2.2from 2001 EcologyStormwater Management Manual for Western
slern Washington
� APPENDIX
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CRITICAL AQUIFER RECHARGE AREA
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ISEAWATER INTRUSION PROTECTION ZONE
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1 xx
1
SEISMIC HAZARD AREA
1
1
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' SHORELINE SLOPE STABILITY
DNR STREAM
This stream and its buffer are shown on the plans as
a reflection of the public record. However, this stream
does not exist as noted in the 8/29/05 letter by Ross
Goodwin (WA DNR). A copy of the letter is provided
in Appendix G and/or can be found in MLA07-00467
Jefferson County DCD.
GC 30
LANDSLIDE HAZARD
� APPENDIX E
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Western Washington Hydrology Model
PROJECT REPORT
IIProject Name: Heinith (ld)
Site Address:
I
City
Report Date : 10/4/2012
Gage Port Angeles
Data Start 1948/10/01
I Data End : 1993/09/30
Precip Scale: 0.80
WWHM3 Version:
1
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PREDEVELOPED LAND USE
Name Road
Bypass: No
IGroundWater: No
I
Pervious Land Use Acres
C, Forest, Mod 1.69
Impervious Land Use Acres
II
IElement Flows To:
Surface Interflow Groundwater
Name Roofs to infiltration
Bypass: No
I
GroundWater: No
IPervious Land Use Acres
Impervious Land Use Acres
ROOF TOPS FLAT 0.11
IElement Flows To:
Surface Interflow Groundwater
Standard WSDOT Drywell, Standard WSDOT Drywell,
I
Name Standard WSDOT Drywell
II
I2.533 0. 001 0.001 0.000 0.003
2. 600 0.001 0.001 0.000 0.003
2. 667 0.001 0.001 0.000 0. 003
II
2.733 0. 001 0.001 0.000 0.003
2.800 0.001 0.001 0.000 0. 004
2.867 0. 001 0.001 0.000 0.004
I
2 . 933 0. 001 0. 002 0.000
0. 000 0.004
3.000 0.001 0.002 0. 004
3.067 0. 001 0.002 0.000 0.004
3. 133 0.001 0.002 0.000 0.004
I
3.200 0. 001 0.002 0.000 0. 004
3.267 0. 001 0.002 0.000 0.004
3.333 0.001 0.002 0.000 0.004
I
3.400 0. 001 0.002 0. 000 0.004
3. 467 0.001 0.002 0.000 0.004
3.533 0.001 0.002 0.000 0. 004
3. 600 0. 001 0.002 0. 000 0.004
II 3. 667 0.001 0.002 0.000 0.004
3.733 0.001 0.002 0.000 0. 004
3.800 0. 001 0.002 0. 000 0.004
I 3.867
0.001 0.002 0.000 0.004
3. 933 0.001 0.002 0.000 0.005
4 . 000 0.001 0.002 0.000 0.005
4 .067 0. 001 0.002 0. 000 0.005
I
4 . 133 0.001 0.002 0.000
0.000 0. 005
4 .200 0. 001 0.002 0. 005
4.267 0.001 0.002 0.000 0.005
4 . 333 0. 001 0.002 0. 000 0.005
II
4 .400 0. 001 0.002 0. 000 0. 005
4 .467 0.001 0.002 0.000 0.005
4.533 0.001 0.002 0. 000 0.005
II 4 . 600 0. 001 0.002 0.000 0. 005
4 . 667 0.001 0.002 0.000 0.005
4 .733 0. 001 0.002 0. 000 0.005
4 . 800 0. 001 0.002 0. 000 0.005
I
4 .867 0.001 0.003 0.000 0.005
4 . 933 0. 001 0.003 0.000 0. 005
5.000 0. 001 0.003 0.000 0.005
I 5. 067
0. 001 0.003 0.000 0.006
5. 133 0. 001 0.003 0.000 0. 006
5.200 0. 001 0.003 0. 000 0.006
5.267 0. 001 0.003 0.000 0. 006
I 5.333 0. 001 0.003 0.000
0.000 0. 006
5.400 0. 001 0.003 0.006
5. 467 0. 001 0.003 0.000 0. 006
I 5. 533
0. 001 0.003 0.000 0. 006
5. 600 0.001 0.003 0.000 0.006
5. 667 0. 001 0.003 0.000 0. 006
5.733 0.001 0.003 0.000 0.006
I
5.800 0.001 0.003 0. 000
0.000 0.006
5.867 0.001 0.003 0. 006
5. 933 0. 001 0. 003 0.002 0.006
6.000 0. 001 0. 003 0.013 0.006
I
6.067 0.001 0. 003 0.028 0.006
6. 133 0.000 0.000 0.046 0. 000
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II
I1980 0.000 0.005
1981 0.005 0.015
1982 0.003 0. 017
' 1983 0.008 0.007
1984 0.006 0. 012
1985 0.000 0.004
I
1986 0. 007 0. 007
1987 0.017 0.023
1988 0.006 0.007
1989 0.002 0.006
II 1990 0.002 0.005
1991 0.004 0.005
1992 0.008 0.017
1993 0.009 0. 013
II1994 0.000 0.004
I
Ranked Yearly Peaks for Predeveloped and Mitigated. POC #1
Rank Predeveloped Mitigated
1 0.0169 0.0228
2 0.0129 0. 0221
II
3 0.0099 0.0196
4 0. 0094 0. 0194
5 0.0093 0.0193
II
6 0.0086
0. 0086 0. 0185
7 0. 0172
8 0.0083 0.0166
9 0. 0080 0.0161
II
10 0.0078
0. 0076 0.0150
11 0. 0128
12 0.0069 0.0124
II
13 0. 0064 0.0113
14 0.0057 0.0105
15 0. 0057 0.0082
16 0.0048 0.0077
' 17 0. 0046
0.0044 0.0074
18 0. 0072
19 0. 0039 0.0067
20 0.0034 0. 0057
II
21 0. 0033 0.0056
22 0. 0021 0. 0053
23 0. 0019 0. 0053
' 24 0.0018
0. 0017 0. 0052
25 0. 0052
26 0. 0017 0.0052
27 0. 0017 0. 0051
II
28 0.0015 0.0051
29 0. 0014 0. 0048
30 0.0010 0.0048
II 31 0.0010 0. 0046
32 0. 0010 0.0046
33 0.0009 0. 0045
34 0. 0008 0. 0042
II
35 0.0006
0. 0005 0. 0041
36 0.0041
37 0.0005 0. 0041
I
38 0.0004 0. 0040
II
I 0.0157 10 37 370 Fail
0. 0161 9 34 377 Fail
0.0164 8 30 375 Fail
II 0.0168 3 27 900 Fail
0.0171 0 24 n/a Fail
0.0175 0 21 n/a Fail
0. 0178 0 18 n/a FailII .
C. 0181 0 16 n/a Fal
0.0185 0 15 n/a Fail
0. 0188 0 12 n/a Fail
0.0192 0 11 n/a Fail
11 0.0195 0 7 n/a Fail
0.0198 0 6 n/a Fail
0.0202 0 6 n/a Fail
I
0. 0205 0 5 n/a Fail
0. 0209 0 4 n/a Fail
0. 0212 0 4 n/a Fail
0.0215 0 4 n/a Fail
II 0.0219 0 2 n/a Fail
0.0222 0 1 n/a Fail
0.0226 0 1 n/a Fail
I
0.0229 0 0 n/a Pass
0.0233 0 0 0 Pass
0.0236 0 0 0 Pass
0.0239 0 0 0 Pass
I
0.0243 0 0 0 Pass
0.0246 0 0 0 Pass
0.0250 0 0 0 Pass
I
0.0253 0 0 0 Pass
0.0256 0 0 0 Pass
0.0260 0 0 0 Pass
0.0263 0 0 0 Pass
I
0. 0267 0 0 0 Pass
0. 0270 0 0 0 Pass
0.0274 0 0 0 Pass
I0. 0277 0 0 0 Pass
0. 0280 0 0 0 Pass
0.0284 0 0 0 Pass
0.0287 0 0 0 Pass
I
0.0291 0 0 0 Pass
0.0294 0 0 0 Pass
0.0297 0 0 0 Pass
0.0301 0 0 0 Pass
II
0. 0304 0 0 0 Pass
0. 0308 0 0 0 Pass
0. 0311 0 0 0 Pass
I
0. 0315 0 0 0 Pass
0.0318 0 0 0 Pass
0. 0321 0 0 0 Pass
0.0325 0 0 0 Pass
I 0.0328 0 0 0 Pass
0.0332 0 0 0 Pass
0.0335 0 0 0 Pass
I
0.0338 0 0 0 Pass
0.0342 0 0 0 Pass
0.0345 0 0 0 Pass
0.0349 0 0 0 Pass
I
I
0.0000 0 0 0 Pass
0.0000 0 0 0 Pass
0.0000 0 0 0 Pass
0. 0000 0 0 0 Pass
II
0.0000 0 0 0 Pass
0.0000 0 0 0 Pass
0.0000 0 0 0 Pass
IC. CCR �= s
0.0000 0 0 0 Pass
0.0000 0 0 0 Pass
0.0000 0 0 0 Pass
I
0.0000 0 0 0 Pass
0.0000 0 0 0 Pass
0.0000 0 0 0 Pass
I
0.0000 0 0 0 Pass
0.0000 0 0 0 Pass
0.0000 0 0 0 Pass
0.0000 0 0 0 Pass
I
0.0000 0 0 0 Pass
0.0000 0 0 0 Pass
0.0000 0 0 0 Pass
I
0.0000 0 0 0 Pass
0.0000 0 0 0 Pass
0.0000 0 0 0 Pass
0.0000 0 0 0 Pass
I
0. 0000 0 0 0 Pass
0.0000 0 0 0 Pass
0.0000 0 0 0 Pass
0. 0000 0 0 0 Pass
II
0.0000 0 0 0 Pass
0.0000 0 0 0 Pass
0.0000 0 0 0 Pass
I
0.0000 0 0 0 Pass
0. 0000 0 0 0 Pass
0.0000 0 0 0 Pass
0.0000 0 0 0 Pass
I
0.0000 0 0 0 Pass
0.0000 0 0 0 Pass
0.0000 0 0 0 Pass
I
0. 0000 0 0 0 Pass
0.0000 0 0 0 Pass
0.0000 0 0 0 Pass
0.0000 0 0 0 Pass
I
0.0000 0 0 0 Pass
0. 0000 0 0 0 Pass
0.0000 0 0 0 Pass
I0. 0000 0 0 0 Pass
0.0000 0 0 0 Pass
0.0000 0 0 0 Pass
0. 0000 0 0 0 Pass
II 0.0000 0 0 0 Pass
0.0000 0 0 0 Pass
0. 0000 0 0 0 Pass
0.0000 0 0 0 Pass
II
0.0000 0 0 0 Pass
0. 0000 0 0 0 Pass
0.0000 0 0 0 Pass
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IAPPENDIX F
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IOperation & Maintenance Plan of Stormwater Facilities
Location I
Robert & Fran Heinith Residence
Cape George Road
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Jefferson County, WA
Introduction
I The roof drainage system protects your foundations, landscape, and the
environment. Periodic maintenance is required to promote performance and
longevity.
IDo not connect additional surface or foundation drains to this system.
Drainage from / along gravel areas should be allowed to disperse into the forest
duff or vegetation.
Responsibility
IThe owner is responsible for providing inspections and maintenance of the
drainage facilities in a manner that promotes functionality consistent with the
Idesigned installation.
Hazardous materials
The drywell discharges to groundwater and the gravel areas discharge to
surface water. The discharging hazardous materials or liquids into them will
contaminate the soil around and "downstream" of them. Some of the subsoil is
Isandy gravel which could facilitate the spread of a contaminate.
Please protect the environment by:
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- Clean-up small spills immediately
- Report large spills and spills to the fire department
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- Dispose of all debris and waste appropriately
Inspections
IFollowing major storms or snowfalls inspect system and address any issue
before it gets worse.
IAnnual inspections and maintenance should be completed prior to the
beginning of the rainy season. It is recommended that inspections begin on or
about August 1 to provide time for maintenance and repair and stabilizing
Idisturbed soil prior to the rainy season.
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IMaintenance
Roof gutters:
I Disconnect downspouts to prevent debris from entering the conveyance system.
Clean litter from gutters and test downspouts with water from garden hose. Do
not connect downspout to roof leaders yet.
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Conveyance System:
Open Organic Litter Trap and secure a piece of garden fabric over the inlet of
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the pipe flowing to the drywell. Using flow from a garden hose, flush the system
at each roof leader.
Clean debris from Trap and dispose of appropriately.
IConnect all the downspouts to the roof leaders.
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Organic Litter Trap:
This traps leaf litter and other debris - preventing it from entering the drywell. It
should be inspected, cleaned, and repaired as needed. As a minimum this
Ishould be done prior to the raining season each year.
Failure to clean and maintain the Trap could seriously affect the longevity of the
dry well.
IDry Well:
I CAUTION! The dry well is a "closed container" and should not be entered
without appropriate safety knowledge, equipment and procedures;
which include a capable monitor/ assistant.
IMaintenance will likely be infrequent if the Trap is maintained. However,
organic material will accumulate in it over-time. When the accumulation is 1-ft
thick it should be removed.
IThis work should be done by an experienced, licensed contractor.
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APPENDIX G