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HomeMy WebLinkAboutBLD2003-00428 GeoTech Report Review - GEO General - 5/15/2003 MASON COUNTY PUBLIC WORKS DIRECTOR/COUNTY ROAD ENGINEER Shelton,Washington 98584 DATE: May 15t", 2003 INTER-DEPARTMENTAL COMMUNICATIONS TO: Scott Longanecker, DCD -Planner FROM: Alan A. Tahja, P/W- Co. Hydr. Engr. WO#PLG-03 SUBJ: Geo-Tech Report Review NAME: Perkins SFR(C17, Colony Surf BL12003-00428 Scott, The geotechnical report and addendum prepared for the proposed residential development at N 80 Pacific Vista, Lilliwaup,has been received and reviewed by Public Works. The report appears to satisfactorily address County requirements for geotechnical reporting. Recommendations contained in the report should be made conditions for permit approval and incorporated into the site's development. Contact me at County extension 461 if you have any questions regarding these comments, or if you feel any features need further discussion or attention. Si cerely, Alan A. Tah' File: H:\WP\GHO\Reviews\Perkins.doc PERMIT# Co3— 2�—z Number. i , Requested by: S—c—E Authorized by: y Date: Type of Work: CHARGE TO: ID NAME c3 AGENCY/COMPANY _ 117 ' - ca BILLING ADDRESS _ n- PHONE _ X12- =~ z (e) Pub. Works Person In Charge: (c) Project Time Line. (from-to dates) TO oProject Stet date: �> �$ Estimated FfNsh Date. Q - — Approxhate hoes: ESTIMATED TOTAL VS: COST ESTIMATE (D) Rik 9"90rrie IE] : Him SyMoW Fdnm% TOTAL= E s>I�¢ l3AIE TOTAL$13 EQUIPMENT USED: MATERIAL USED. :J-:.. :^s>:-.a..<.:..dC-'. -:.v. .SSp:�'. .:i:✓:::'!•'.;V`^" :."` •'A;,':_.GAY...:..,y...,. �.... -.....r:--::•t-:r S'J::•.it-:..-..• :.....:. y' .,y+.CZiC. `^^..`i`." ..,Y,'.`:::-: v..-:::.-. ....... +v.:- 4iv::.. ... .•...-:vi:::.v:rv.}:.. •{]/�x�/��y� �C'�� ^:->::iiv,•?iK:.y.:«.:t::.nn}-v.'.•...r.. �SWC!NFCODG(OlfltyGP?M.AMC.V>.��MR�J.�t•MSS}p00tgMC]irl�MlC�rOLC.VOK!EQ:1000HIYiGCO:.:KMt�HM\"vA.", !1.a�A. J.�S�.r, w.... KOri. � !v.:T•.. (F) Actual Cost : . BARS: PROJ 9: DATE Employee Narm Flours SUtKoW FrInoe% TOTAL$ EQUIPMENT USED: TOTAL f'S MATERIAL USED: TOTAL ALL (G) BILLED DATE INV 9 PAID DATE RECI CKX THOMAS E. RICHL,P.E. 2119 No, 92id Street Seattle, WA. 98103 1-206-524-4819 Fax 1-206-524-4406 or POB 21 Lilliwaup,WA. 1-360-877-5545 Fax 1-360-877-0748 Mobile 1-206-930-5624 January 31, 2003 Mr. and Mrs. Howard Perkins 324 28 h Avenue S.E. Puyallup, WA 98374 Reference: Colony Surf Property located at N 80 Pacific Vista Lilliwaup, WA 98555 Parcel #32309-53-01010—Lot 10 Block 1 Division 3. Subject: Geotech Report on the referenced property. Dear Mr.and Mrs. Perkins: Mr. Rick Bohanon,of Shamrock Builders,contacted me by phone and asked me to do a Geotech Report on your Colony Surf property. I said I would and Mr. Bohanon and myself met on January 20, 2003 at your lot. We walked over the property and discussed where you wanted to build your house which will have a daylight basement on the South and East. Itook some photographs. I went to your property again on 1-24-2003 to review my dimensions and validate my sketches. I took some additional photographs. In the meantime Mr.Bohanon had layed out the approximates location of your proposed house. Your property is basically flat where you plan to build your house but the level area is very limited to the Southwest part of the lot. There is a 45 degree plus/minus slope on the South and East which is noted on my Site Plan,see sheets 4 and 5. Some trees will have to be removed for the daylight basement on the East and for the house on the Southwest. The septic system is in place and approved. The East and South downslopes are heavily vegetated and lush with native brush, shrubs and trees and are stable. All trees are growing vertically. There is power and water available on the.Pacife Vista acces§road There are no slides either past or present that I observed in the surrounding area. Your lot 10 is a large rectangular piece ofland in Colony Surf Block 1 Division 3. The flat building area is on the Southwest corner near Pacific Vista cul-de-sac. Your entrance to your property is a 27.11-feet opening.to Pacific Vista-cuI de-saa The flat building area is almost upon the edges of the downslopes on the South and East. The daylight basement below the existm&gmde help&this condition,see Site Plan on sleets 4 and profiles on sheet 5. The runoff from the proposed roof may be diverted to either the South or East downslope. Sheet 1 of 11 Sheet 2 of 11 Geotech Report to H. Perkins from T. Richl dated 1-31-2003. The soils in this area are of the Hoodsport Series. The Hoodsport gravelly sandy loam 30 to 45 percent slopes(Hf). These soils are well drained, reddish soils on the uplands. These soils have.developed from granitic till that is highly stained by iron and that contains considerable metamorphosed and basic igneous gravel and stone. This parent material originated from local till and from glacial till from the Vashon Glacier. The rainfall is 70 to 100 inches a year, vegetation is a dense forest of Douglas-fir, Hemlock, cedar,andalder_ The understory consists of native-shrubs and brush such as wild huckleberry, vine maple and small trees. The hoodsport soils are shallower, stonier and more acid than other soils,in addition they have developed under heavy rainfall. This soil occupies the deep and precipitous canyons between the plateau and the deeply entrenchedSknkomish and Ham maHammaRivers and Hood Canal. The soil develops slowly on these moderately Steep slopes. This soil differs from the other Hoodsport soils in having-many large irregular stones_and boulders scattereriover the surface and in the soil and parent material. Below this surface soil are intermittent layers of cemented gravel_and sand(hardpan)_ This type of soil is.best kind for supporting a footing/structure. This undisturbed soil is capable of supporting loads in excess of 2000 lbs/sq.ft. AP1ntPlan_is.shamon_sheet 3.. A.Site_Plan_isshavra.on.sheet 4. Profiles of the downslopes are shown on sheet 5. The photographs on sheets 6 and 7 show the building site. The photographs on sheet 8 and 9 show the East and South downslopes. The photographs on sheet 10 show the heavily lush vegetation on the South and East slopes. A penetration test.is shown on the photographs on sheet 11. Thomas E. Richl,P.E. File: PerkinsWAS Job# 103-1 cc: Mr. Rick Bohanon(3 copies) �. ONE Sheet 2 of-11 � v °° Y J i to t Qt Z 0 J L li- a K1 i o / s % a � tq �; Ln S Y r ttL n VI UN vc r fl -701 roVE cZ O i -IRA m 3; . _ _ r- c� V � to Z � v M vi coL +w. Ol ,� 4 a 1 E�� o W LU a � Q ® o K 0 4 s ow r 1 a a tit L! tl �p• pRpP. UqE LirJC CID o® M1M �EfYbVE.Bf-1NK ATDA�lLl6NT BSM� ® STADLE HANK L.U3H Vr-GETATiom © AAA L►r-KT v-.DSMT ® 'tlnC%C FRAME 500n-\ 'EAST WAILS dVEC2NiaNCs —.�IIEW LOOK%pr. WEST L\NE I ®� ED\zo as: MIN• \ SF.GT l O V tEW LOOK�I3G 1.1oQTH— t 11+ oC) TRwK L JAM�1y.2 ao3 5NEE1' o� i Io BARB sERT YAS. 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Ir �=fi���r. f .?!�ri;z7r_ .r c•--'i^i—'''yi- --.� -1 rs�s?'" T y` - L y`fA '` 3 i _i! ��T�vf-,'l Y [- �r�.J.♦�.� .d� %"'•?•'f_f..i,�� „� *Yi.,,.r"tc3+--.''`ice�. � '"."•M'1+1,.,� 't'r.tom s,..��+ it - _ .� �' ,-: � :•x,�,v t, �i-}�r- ->�.y+'���.�.x '�"-R'..ii`'N�li Lam. �� f - Y w..'7 "� 'ag {�">.,r" �,�,.--ay�Y�%,��+/7��y�,�J�:.. s-_``'�"w J!t•�-,�E• r t`1�. �K'� � •. � s THOMAS E. RICHL,P.E. 2119 No, 92na Street Seattle,WA. 98103 1-206-524-4819 Fax 1-206-524-4406 or POB 21 Lilliwaup, WA. 1-360-877-5545 Fax 1-360-877-0748 Mobile 1-206-930-5624 May 3, 2003 Mr. and Mrs. Howard Perkins 324 2e Ave. S.E. Seattle, WA 98374 Reference: Geotech Report dated 1-31-2003 -Job# 103-1 for Colony Surf Property Located at N 80 pacific Vista, Lilliwaup, WA 98555—Lot 10 Block 1 Division 3 Parcel#32309-53-01010. Subject: Additional information required by Mason County—BLD2003-00428. Ltr dated 4-29-2003 from land use planner. Dear Mr. and Mrs. Perkins: Mr. Rick Bohanon of Shamrock Builders faxed to me Mason County's comments on my geotech report dated 1-31-2003, Job# 103-1 . I submit the following as answers to fulfill this request. Mason County has designated many acres of hills and slopes as landslide hazardous areas. Colony Surf development falls between the two major slides which covered Highway 101 North of Lilliwaup during the heavy rains of 1996 and 1997. Item 5 of Mason County Ordinance section 17.01.10013 Section 5. There are no slides that I know of, in Colony Surf proper, as a result of these heavy rains in past years. The soils on the Perkins property consists of the Hoodsport Series soils. These soils are composed of sand, gravel,rocks and boulders with a small amount of clay as a binder. Below the surface are intermittent layers of cemented till (hardpan). These layers of cemented till make this soil stable so that slides are not apt to occur. This soil has the capability of an angle of repose of 75 to 80 degrees from the horizontal. The static loading of this soil is capable of resisting downloads in excess of 2000 lbs h st As for seismic loading conditions, all of Colony Surf properties survived the February 21, for earthquake without damage. 2001 As a personal note, I own 5 lots below the Perkins property in Colony Surf. I was in my house when the earthquake struck. It felt quite severe but my property sustained no damage. Sheet 1 of 2 Sheet 2 of 2—Follow-on report dated 5-3-2003 from T. Richl to H. Perkins As I have previously noted, a formal seismic evaluation is expensive and I do not see the need for one. From past experience I had a slope stability anal ysis done on the same t Of soil with a similar slope. In my opinion, it would yield a factor of safety at least 2.0e This previous program was by MC Squared in Olympia, WA using a program by Tensar Corporation,April 1986, Tensco 1 Program, Version 2.1 (August 1989). Item 7—Only those trees on the East slope will be removed which are in the footing area over the bank. Some trees will have to be removed on the entrance to the roe g Pacific Vista. Vegetation is minimal in the building area.on the East. However off Perkins plan on planting native shrubs and plants on the exposed slopes after a the construction. Item 8 —A silt fence will have to be used on the slopes to stop erosion. Item 9—The houses on both sides are at least 200 feet away from this construction. The house on the South is still under construction. There will be no impact on neighbors. No residences are on the East. A residence is across the Pacific Vista road to theWest. Item 10-Runoff from the residence may be diverted over the heavily vegetated bank. Buffer widths have been observed. Erosion control will be from exposed slope plantings after construction. The property owners on each side of thisProposed vegetated slope. The roe house are built on the lip of this same uth is North 70 Pacific Vista Lilies up, WA 98555the ling addresMr. ands Mrs. s73oe Caston guay at S.E. Olympia, WA 98513. The Property 4 Glacier Viewlane p PAY owned on the North is a Ms Catherine Rodes at 10840 Forest Avenue S. Seattle, WA 98178. Vista Lilliwaup,WA 98555. Her property, at Colony Suri, is N 90 Pacific Thomas E. Richl,P.E. e�r''' "" Job# 103-IC cc: Mr. Rick Bohanon '��•i wasp , f File: HoPerkins Attachments: Sheet 2 of 2 1781685 Page: 1 of 3 05/14/2003 08:33A PERKINS COV 21.00 Mason Cc, WA When Recorded, Return to: Mason County Planning Department P. O. Box 578 Shelton, Washington 98584 LANDSLIDE LARD COVENANT Grantor: 1)Howard T. Perkins Barbara J. Perkins 2) Additional on page Grantee: 1) Mason County 2) Additional on page LEGAL DESCRIPTION(Abbreviated): Lot lO,Block 1,Division 3 ,Colony Surf @ N. 80 Pacific Vista, Lilliwaup,WA 98555 Additional on page- Assessors Tax Parcel ID# 32309-53-01010 Reference Nos. of Documents Released or Assigned: 1 of 3 LANDSLIDE HAZARD COVENANT This covenant executed this date in favor of the Mason County Planning and Building Department(herein"County"), by the undersigned Owners) Grantor(s)of within/described real property, WITNESSETH WHEREAS, the undersigned is(are)the owners(s) of or has (have) a substantial beneficial interest in the real property addressed in the records of the Mason Planning and Buildin Department as N,80 Pacific Vista,Lilliwaup,WA 98555 g Described in Exhibit"A"(legal description) attached, and WHEREAS, owners)has(have) obtained approval of land use and buildin Property from the County(# BLD2003-00428 g permits for the , and WHEREAS, the property is located in a" landslide hazard area"as defined in section 17.01.100 of Mason County Resource Ordinance#88-00, and WHEREAS, section 17.01.100(p), of Mason County Resource Ordinance#88-00,condition of the issuance of land use and building acknowledged, and recorded in the records of Mason County, this covenant requires as a be signed, NOW, THEREFORE, Owner(s) agree(s) as follows: (1) Owner(s) will inform his/her successors and assigns of the property described in Exhibit A" that the property is in a" landslide hazard area", that there may be risks associated with development theron, of any conditions or prohibitions on development imposed by the County, and of any features in this design which will require maintenance or modification to address anticipated soils changes. (2) Owner(s) on his/her own behalf and on behalf of his/her heirs, successors and assigns hereby waives (waive) any right to assert any claim against the County, its officers and employees, for any loss, or damage to people or property either on or off the site, resulting from soil movement by reason of or arising out of issuance of the Permit(s) by the County for development on the property, except only for such losses that may directly result from the sole negligence of the County. 2 of 3 1781685 05/14/2003 08:33A PERKINS COV 21.00 Mason Co, WA 1781685 Papa: 3 of 3 05/14/2003 08:33A PERKINS COV 21.00 Mason Co, WA Related to land use and building pets # BLD2003-00428 --------------- DATED this 8 day of May 20 0 3 P� OWNER/GRANTOR OWNER/G R State of Washington ) ss. County of Mason ) On this day personally appeared before me (and) r individuals) described in and to me who executed the within and fore oknown to be the and acknowledged that he/she the g mg instrument, (they) signed the same as his/her(thee-) free volunt ary act and deed, for the use and purposes therein mentioned. Given under my hand dayof ��� 20p:3 . SSI :' U: NOTARy�'� r i PUBLIC OT Y PUBLIC IN AND FOR THE ,4os 27•-"*'o� STATE OF WASP NGTON RESIDING IN SHELTON 3 of 3 NOTICE OF DEVELOPMENT APPLICATION May 9, 2003 RE: BLD2003- 00428, Mason County Building Permit Application for residence at 80 N. Pacific Vista Dr., Lilliwaup WA., Lot 10, Block 1, Div. 3 of Colony Surf. Parcel# 32309-53-01010. Notice is hereby given that Howard Perkins, the owner of the described property has filed an application for a Mason County Building Permit for the purpose of constructing a single family residence within the 50 foot buffer of a landslide hazard area on the above mentioned property. The application was filed on 4/14/2003. It is the intent of the Mason County Planning Department to approve this building permit application based upon the findings of a Geo-technical Report and Mason County engineering review that was performed as part of the permit requirements. It is the requirement of the Mason County Development Code and the Landslide Hazard Areas Chapter 17.01.100 that public notice be given when an application is made to reduce the 50 foot buffer of a landslide hazard area"for the purpose of constructing a single family residence ...." "The Director shall approve such a reduction only on finding that the approval is conditioned as necessary to be consistent with the recommendations contained within the Geotechnical Report or Geological Assessment..." Building Permit#BLD2003-00428 will be approved by the Mason County Planning Department pending public comments/appeals made regarding this development. Written comments on this building permit application must be received by 05/23/03, and should be sent to Bob Fink, Planning Manager, Mason County Department of Community Development, PO Box 279, Shelton WA 98584. Please contact Scott Longanecker of Mason County Department of Community Development with any questions or clarifications on this development and/or permit, at (360) 427-9670 ext. 286, E-mail scottlC;co.mason.wa.us, or at the above address. Scott Longanecker, Senior Planner Mason County Department of Community Development, Planning Division