The URL can be used to link to this page

Home My WebLink AboutBLD2007-00201 Geotechnical Report • • ALLEN L. HART ENGINEERING GEOLOGIST 1720 NORTH OAKES,TACOMA,WASHINGTON 98406 (253)752-8963 March 28, 2009 Project No. 0701003 Paul and Janice Coover 55 Beach Drive .I4(LIA1%� AJ Quilcene, Washington 98376-9681 Site Visit Report AN — 2 2013ki Coover Residence 55 Beach Drive �} n pI Quilcene,Jefferson County,Washington r i Qr'i 1 n- s'l COUNTY Q D Parcel Number 701344049 Permit Number 07-00202 At your request, this report follows my visit to the referenced site on March 27, 2009 for the purpose of confirming that the completed of the site work has been done in general conformance to the recommendations contained in the geotechnical report for the project dated March 13, 2007. This inspection addresses item 1 listed on the Jefferson County Department of Community Development Inspection Results form dated February 7, 2008. To aid in expediting the project a copy of this report has been e-mailed to Jeremy Vance,your contractor. Geotechnical Report Referenced "Report of Soil and Slope Survey and Geotechnical Engineering Study, Proposed Single Family Residence, 55 Beach Drive, Quilcene, Jefferson County, Washington, Parcel#701344049", by Allen L. Hart Engineering Geologist for Paul Coover. Report dated March 13, 2007. Area Covered By This Report The area covered by this report extends around the residence structure and other adjacent facilities not covered by the previous inspection completed on February 13, 2008. The previous inspection on February 13, 2008 covered portions of the project generally from the driveway to the north property line and from roughly 50 feet east of the residence structure to Beach Drive, including the detached garage with satellite bedroom structure. The February 13, 2008 inspection was previously reported on the report dated February 14, 2008. Conclusions Based on my observations made during this site visit, review of pictures provided by the contractor, and review the geotechnical report and associated project drawings, it is my opinion that the completed site work on the property identified above is in compliance with the recommendations of the March 13, 2007 geotechnical report and project drawings and acceptable. Within the above identified area structures/facilities have been properly installed and erosion protection provided in all areas of disturbed GEOLOGIC AND GEOTECHNICAL CONSULTING Project No. 0701003 • • Site Visit Report Coover Residence,Permit#07-00202 March 28,2009 Page No.2 soil. Intercepted and collected storm water is directed away from slope areas and buildings for disposal. No evidence of surface erosion was observed in or around designated areas of water infiltration or dispersion.No evidence of off-site water flow was noted. Based on my observations it is my opinion that the geologic/geotechnical site development recommendations have been followed and no additional inspections for compliance with those recommendations are required. Report Limitations This report has been prepared for the exclusive use of Paul and Janice Coover and their agents for use in considerations regarding the subject property. The forgoing comments and conclusions are based on my visual observations made on March 27, 2009 and a review of the March 13, 2007 geotechnical report and associated materials noted above. The conditions described in this report and the conclusions contained in this report are provided for the specifically identified portion of the site only and should not be expanded for use on adjacent sites or properties without additional exploration and review of those sites by this firm. The results of this review are intended for the use of the original client only. Use of this report in whole or part by third parties will require a written agreement be in place between the consultant and the third-party. Within the limitations of scope, schedule, and budget for this work, it is warranted that the work has been done in accordance with generally accepted practices followed in this area at the time this report was made. No other warranty, expressed or implied is made. Should you have any questions or if I may be of additional assistance,please call my office at(253)752- 8963. of W _Sh,'� '+Sincerely , -e "',TO.• - 0,. 1 n . H PG, RG EG, LG k' 4 4 �� ,wri ' * Licensed Engineering Geologist • Enylr,eedng Geologist ,� �' 542 - 17Sed -°\°'/ / 7.;' -Ti -7.7 ,(--17-:, T-7 77--n I...._...L HA T , ��jjjj��G APR LUG. .J41-EUS t CUUF1 0C1! ALLEN L.HART ENGINEERING GEOLOGIST 1720 North Oakes,Tacoma,Washington 98406 • ID 1 C( (T) - :DD I 0 ALLEN L. HART ENGINEERING GEOLOGIST 1720 NORTH OAKES,TACOMA,WASHINGTON 98406 (253)752-8963 February 14, 2008 Project No. 0701003 -11? Rob Thomas " - 4 1T - ' ,rThomas Construction 1 t� P.O. Box 998 ..? . � � r �, Kingston, Washington 98346 4. �: 2. ,3 Site Visit Report `'°•' ; l t t;:r,,., Coover Residence tel .,,, 55 Beach Drive Quilcene,Jefferson County,Washington Permit Number 07-00202 At your request, this report follows my visit to the referenced site on February 13, 2008 for the purpose of confirming that the completed portions of the site work have been done in general conformance to the recommendations contained in the geotechnical report for the project dated March 13, 2007. This inspection addresses item 1 listed on the Jefferson County Department of Community Development Inspection Results form dated February 7, 2008. Geotechnical Report Referenced "Report of Soil and Slope Survey and Geotechnical Engineering Study, Proposed Single Family Residence, 55 Beach Drive, Quilcene, Jefferson County, Washington,Parcel#701344049",by Allen L. Hart Engineering Geologist for Paul Coover. Report dated March 13, 2007. Area Covered By This Report The area covered by this report extends from the driveway to the north property line and from roughly 50 feet east of the residence structure to Beach Drive and includes the detached garage with satellite bedroom structure. The residence structure and adjacent facilities are not covered by this report and will require an additional inspection when completed. Conclusions Based on my observations made during this site visit and those made during a site visit in August 2007, it is my opinion that the completed site work on the portion of the property identified above is in compliance with the recommendations of the March 13, 2007 geotechnical report and project drawings and GEOLOGIC AND GEOTECHNICAL CONSULTING r Project No. 0701003 . I Site Visit Report Coover Residence,Permit#07-00202 February 14,2008 Page No.2 acceptable. Within the above identified area structures/facilities have been properly installed and erosion protection provided in all areas of disturbed soil. Intercepted and collected storm water is directed away from slope areas and buildings for disposal. No evidence of surface erosion was observed in or around designated areas of water infiltration or dispersion. No evidence of off-site water flow was noted. Report Limitations This report has been prepared for the exclusive use of Thomas Construction and Paul Coover for use in considerations regarding the subject property. The forgoing comments and conclusions are based on my visual observations made on February 13, 2008 and those made previously in August 2007 and a review of the March 13, 2007 geotechnical report and associated drawings. The conditions described in this report and the conclusions contained in this report are provided for the specifically identified portion of the site only and should not be expanded for use on adjacent sites or properties without additional exploration and review of those sites by this firm. The results of this review are intended for the use of the original client only. Use of this report in whole or part by third parties will require a written agreement be in place between the consultant and the third-party. Within the limitations of scope, schedule, and budget for this work, it is warranted that the work has been done in accordance with generally accepted practices followed in this area at the time this report was made. No other warranty, expressed or implied is made. Should you have any questions or if I may be of additional assistance,please call my office at(253)752- 8963. eof ,. ,'� / Sincerely, �,` A �- , en L. Hart, CPG, RG/CEG E^sne G'0loeut .` Licensed Engineering Geologist i� st2 -/�'. / la° IMERIMEMIAll ALLEN L.HART ENGINEERING GEOLOGIST 1720 North Oakes,Tacoma,Washington 98406 • I Stormwater Maintenance Manual Coover Site Development Beach Drive Dabob Peninsula, Jefferson County Prepared by A.D.A. Engineering, LLC P.O. Box 847 Poulsbo, WA 98370 (360) 779-6633 Stormwat Require APPROVED STORMWATER PLAN JEFF RS ,' '0 N Y DFPT OF C A ' I F .DPW NT SIONAflllRF _�__. • • Manual Purpose: The purpose of this manual and the enclosed inspection sheets is to provide a maintenance plan to ensure the continued proper operation of all stormwater facilities associated with your property. Lack of maintenance could lead to local flooding, water damage and costly repairs or replacements of these or other infrastructure. Project Description: The stormwater system that serves this site was designed to accommodate: 0.16 Acres of Impervious Surface 0.10 Acres of Landscaped Area 0 Acres of Natural Vegetation Stormwater System Description: The stormwater system consists of the following items that are labeled on the enclosed site drawing with the following symbols: CB: Catch Basin LS: Level Spreader Maintenance Intervals: Project Construction Information: Contractor: Address: Phone No.: Date of Construction: Emergency Operations: 24-hour contact Name: Phone: . . • • Date of Inspection: Inspector. Maintenance Checklist for Oil/Water Separators Definition: Separators are designed to remove oil and sediment from water before the water is discharge to the storm drainage or sewer system. it is an underground structure with above ground access for maintenance. It may have baffles (vertical plates) or absorbent pads to retain floating oil. You need to identify which type of oil water separator you have and if it discharges to stormwater or sanitary sewer. Frequency Drainage Conditions requiring Results Expected After Systems Maintenance(cleaning) Maintenance Performed i Feature Quarterly Any o/w Structure is riot separating oil Separator repaired or replaced and after separator from water or is ejecting oil so that oil is beingremoved J 9 each oil spill back into stormwater system from stormwater Quarterly Spill control After each spill All oil removed • and after o/w each oil sill se.arator ! Quarterly Spill control When oil accumulation All oil removed and after o/w exceeds 1/2 inch in the first each oil spill separator chamber or aiy visible oil in the second or third chamber. Quarterly API o/w When oil accumulation All oil removed and after separator exceeds '/ inch in the first • each oil spill chamber or any visible oil in the second or third chamber. Quarterly API olw When the sediment level All sediment remove and after separator reaches 6 inches it should be each oil spill removed. J Quarterly Coalescing When oil accumulation All oil removed and after plate exceeds 1/2 inch in the first each oil spill separator chamber or any visible oil in the second or third chamber Quarterly Coalescing When the sediment level All sediment removed and after plate reaches 6 inches it should be each oil spill separator removed. V • • Date of Inspection: Inspector. Maintenance Checklist for Catch Basins Definition: These structures are located beneath many, but not all storm drain grates. They are underground boxes designed to pass water through an outlet pipe while trapping sediment that settles to the bottom. Type I: An underground concrete water-receiving inlet, rectangular in shape (approximately 3'X 2'X 4'deep)with a slotted iron grate on top to inlet water or a solid rectangular cover. Water may also enter/exit through culverts visible in the sidewalls of basin. Type II: A round concrete underground basin (4'-8' in diameter; 6'deep or deeper); may contain FROP (Flow Restrictor Oil Pollution control device). These basins are also required when larger diameter culverts are used. Frequency Drainage Conditions requiring Results Expected After Systems Maintenance (cleaning) Maintenance Performed Feature Twice per Ladder Ladder is unsafe due to Ladder meets with design Year Rungs missing rungs, misalignment, standards and allows (Type It only) rust or cracks maintenance persons safe access. Twice per Trash or Sediment level is 6 inches or All sediment, trash, and debris Year Debris greater removed (including sediment**) **NOTE: If using a vendor, ensure that the vendor properly disposes of sediment. If not using a vendor, call the Bremerton Kitsap County Health District Environmental Health Section at(360) 337-5285 for information on how to dispose of sediment. • i Date of Inspection: Inspector. Maintenance Checklist for Dispersion Trenches Definition: Dispersion Trenches are rock filled devices used to spread water from a collection source over a wide area to encourage gradual infiltration over a large area. Larger trenches may contain catch basins and boards to assist in spreading the water. Frequency Drainage Conditions requiring Results Expected After Systems Maintenance (leaning) Maintenance Performed Feature Twice per Distribution Sediment**exceeds 10% of Sediment, trash and debris Year Catch Basin storage depth or if any at any cleaned out location the depth exceeds 15%of the storage depth Twice per Distribution Evidence that water flows out Clean system and contact year Catch Basin of catch basin instead of design engineer to determine pipe/trench whether redesign or rebuild is necessary Twice per Pipe Over %of perforations are Pipe cleaned or replaced Year Perforations plugged Twice per Erosion Evidence of channetized Trench Redesigned or rebuilt to Year discharge (ruts at outlet, etc.) produce sheet flow See also Catch Basin Checklist if Trench design contains catch basin **NOTE: If using a vendor, ensure that the vendor properly disposes of sediment. If not using a vendor, call the Bremerton Kitsap County Health District Environmental Health Section at (360) 337-5285 for information on how to dispose of sediment. . • 0 Date of Inspection: Inspector. pipe O.D. .i...L9 i /. -0 ..... mitt f'mid end cap or pkrg tow to second r-=r";• dispersal bench p• clean out wy from pipe *necessary --. * • pi ti o' % R, • 4"or6"perforated pipe h..d fiatllevQl not bed °r o o• glade board �` -,� a 2'x 2`nothcs ti v4 4'%type l C B*Aso id cover(lacking) i8'O.C. A dAL II 4 Wsnt pe (mx ds r4 • Q° ,, flow t0.6CFS per trench) tn. V. p• ,4 • clean outr'from pipe ;.-a• lbw b other PLAN bran hingCB's a5 retry I 18'O.C. J galvanised bolts pi.O.D. 4:: ::? :=4.12.gad' 2„ 1'•0 1'-0 p ie scure 1 .r.de,ty,t_152 ' 6 a . baud notches 2" cared l}' ( • e t• ^,::4'or6'perfaaead board "r,_ .., o v °c pi;*tail fist NOTES: 4"X 4'support post _'. ek 'r Ckan 1.This trench shall be constructed so °,-< 14hk'-ar4"Wadwd rook as torg prevent point disc hae andb r 4'M. •q•r Nt'• erasion. filter fabtb 2.Trenches may be placed no closer than 50 feet t one&rotteer.(100 feet talc rnexirs tam ccrkaYWater q-+d�Y along 1ba4r ) treat rrer't In tutet areas. 3.Trench and grade board rust be level At n to 1d bw co rrooursof she. SECTION A-A 4.Support post spacingas required by NTS soil oo nd ltbrts to ensure grade board remains bevel. Flow Dispersal Trench • I STORM DRAINAGE REPORT Coover Site Development Owner: Paul Coover 2545 NE Kevos Pond Dr Poulsbo WA 98370 (909) 994-9001 l N. AR, ; Apri13,2007 ��,¢ `��'� � , - r z 0. SIONAL Et`° Prepared By: ADA ENGINEERING P.O. Box 847 APPROVED Poulsbo, WA 98370 STORMWATER PLAN Phone: 360-779-6633 Bainbridge Is. Phone: 206-842-6123 St0rnw3ter ; \Aiss JEFFERSON N iced II DFPT OF('O ' Vf l.) NAPNT SI Requ GNAT( RF 410 • TABLE OF CONTENTS DESCRIPTION PAGES Narrative 1-2 Site Map(s) 3-6 Basin Map(s) 7-8 Soils Classification 9-15 Hydrological Analysis 16-22 Downstream Analysis 23-24 • • Introduction The project site is located on the west side of Dabob Peninsula which is on the east side of Jefferson County. It is in the SE of Section 34, Township 25 N, Range 1 W, WM, Jefferson County. The subject property is Lot 2 of the Kennard Short Plat (SUB95- 0031). Access to the site is via Beach Drive. This drainage report details the location and distribution of stormwater resulting from development. Pre-Development Condition In the pre-development state the project site totaled 2.65 Acres of mostly gradually sloping terrain with established second growth timber. The drainage path for the site is downhill to the west, the north, and the east. Stormwater runoff flows north to an unnamed creek in which it flows west into Dabob Bay. As to the properties surrounding, they all contain established 2nd growth, although the land to the north contains a clearing and the land to the east contains a small lake. The stormwater runoff from upstream is minimal because of topography(slopes drop off on three sides of this land). Post-Development Condition The proposed development for this project is the construction of a private residence, a small detached building, a driveway connecting these structures to Beach Drive. Stormwater mitigation facilities for this development are also proposed. The stormwater runoff from the building roofs is to flow to level spreaders through pipes. Since only an insignificant gutter system is to be provided, the stormwater is to fall off of the roof into trenches in the ground which are to contain perforated pipes. The level spreaders are to disperse the stormwater down the slope to the north. The stormwater runoff from the private driveway is to be conveyed to the ditches that are to be placed along the sides of the driveway. The stormwater in the ditches is to flow into tightline through a CB on the east side of the driveway. This tightline is to convey the stormwater to yet another level spreader for the purpose of dispersion to the north. The CB mentioned above is to contain an oil/water separator for the containment of possible oil spills. As for areas in Lot 2 not affected by the proposed development, they will be left undisturbed along with the native vegetation except during the installation of level spreaders. Theory of Analysis The enclosed drainage computations were calculated using the Western Washington Hydrology Model version 2.5f as required by the Stormwater Management Manual for Western Washington. Pre-developed and post-developed areas are shown in Exhibit A. Pre-development site conditions are established secondary growth timber with slope ranging from 0% to 55% (70 ft top of bank setback has been applied). Minimum Requirements #1. Preparation of site plans Required #2. Construction of Stoiiiiwater Pollution Prevention Required #3. Source Control of Pollution Required #4. Preservation of Natural Drainage Systems and Outfalls Required #5. On-site Stoiiiiwater Management Required #6. Runoff Treatment < 5000 SF PGIS, < 3/4 acre PGPS #7. Flow Control < 3/4 acre lawn/landscape, < 2.5 acres pasture, < 10000 SF effective Impervious Area, < 0.1 cfs increase in 100 year flood frequency #8. Wetlands Protection No Wetlands #9. Basin/Watershed Planning Provided by Jefferson County #10. Operation and Maintenance Manual • EXHIBIT A SITE MAP(S) • 110 2 Cu a Sd 33 o N ° A n° PN° d_ II r N = U Z Z o a ati ., Jw .r/ °AN im N zUz:" F1- CI) �Z� =Q, LLm m S -2s' S6'E ,�4 f�J< H>"d � ' Y` 3 _ o=2 0/ Jg a Lw dam• . hoo° / aOCn ¢e_n „. / Doo\ .7, 88 %f, rA� 1 0 'If.) e w„$N Y l 1 = t / N K. NI N ✓ -- F°I x e d I/ 1 Z` e N 18 o N ' 0}� o� X x X 7 n y�a_ n l _ x 0 C i-WNJ 4 I X X 0 m m0 "'*L6 od P � J '° I a 6 c:ya� 1- L i 7 i 2'4' �I ? N N of'€^ohs J ii y -C` WI aj , mono::I- '7 ,„7 , u` y ` nN yAO i-V_ m A W mnN co r1 c Z 0 RI N h w O ` a e - u - C ` Li m CO \ 0 Ce O eQ „J N z o J 4 \ o - Cr) ` " O C !Iw y< J < \ Cu < _--J 0 N aW - O1 _ ° _ y - ^ a O f- • z u= J W CO G N vC ` -< N3d p ,y J_,,_am. ' " �. D 2 L LD -NZ 3_m(.0:.tNf 3.m0.Ot.IN N+ N3/i ZZ0 tJJ O ON �Qd_ _0_ 29'661 -I— N. > J o HLz cJ t-- •= Q „ o O ~ N . tit J-4'~d I v y uj9 W o - U < G Wy K zT '61- _ J O Z �_� 2 �3 al CFO <J i It II cm f'D O .d 8—•� t V cj 6 J' Ow °Q N LL o r �N -s LJ QI 1 21: QQ 211. OyN IZi .. 0LL r� I. ' ' C i d O y O • W �jI �•--��—_i �I z t'J Q N~ F N a �. v 3 z � • i ° h d wo WF J° d��I— LL CD J ; :Yr, (n aoN aiJ0U L. 2 0 _i �x 'rm 4LN IPI' N Wwa F� w 2 I w ilc i, .....! . In _ pv e,> 0 uul _ < t. p s0 al O _aa aQ{- coo a�-,2-71 I Wu asJoa*i t_pQ�o lb�d Ati, o8b0 gQ-11 ZCC Oay...n a.L r 7 ?b/sw rvi dS --- _ j W(1N'7NIMVHI i d38Wf1N`JNIMVtlO a31 tl39