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Home My WebLink About501041038 Geotech Assessment (2007)GEOTECH CONSULTANTS, INC. Celebrating 2l1 Ye~c~s 198b-2006 1325b Northeast 20th Street, Suite lb Bellevue, Washington 9$005 (425) 747-5b18 FAX (425) 747-85b1 1 ~ ~ ,~_ ~,, ~ ~ ~- :~ Bosworth Hoedemaker LLC ~ 408 North 45th Street Seafitle, Washington 98103 Attention: Jessie Temple Proposal: Review 0f Civil Engineering Drawings Proposed Coyle House. 549 Thousand Trails Road Jefferson County, Washington Dear Mr. Temple: r4. Y,. l iI ,J I ~;. 8 June 6, 2007 JN o~2s9 via email: Jessie a~boswvrthhoedemaker. com we have com feted a review of the geotechnical aspect of the civil engineering As requested, p r the ro Deed Co [e House to be constructed in Jefferson County. For our review we drawings fo p p Y with the three sheets of civil engineering drawings prepared by Browne Engineering, were provided Inc. dated May 25, 2007. review of the drawin s all water collected from roof and impervious areas will be Based on our g o dischar a at a dis ersion basin located at the toe of the steep slope. Can the steep t~ghtl~ned t g p i e will be laid on the surface of the slope, This prevents the need for slope itself, HDPE p p and has a !ow excavatin a trench into the face of the steep slope. This type of pipe is strong 9 .. ' ~ llama ell in the event that it is undermined by future soil movement on the steep potent~a[ for bung g slope. ovided tans are enera[ly consistent with our recommendations and Based on our review, the pr p g ~ n es that we tations for this site. We do have two minor comments regarding cha g our expec ' im octant to revent water from following the trench line between the suggest for the plans. It is p p the ~ e trench use and the to of the steep slope. As a result we recommend that p p proposed ho p ~ the etas slo a be bac[~filled entirely with compacted on3s~te silty wdth,n at least ~0 feet of the pop of p p .. 50-foot ree-drainin ravel bedding should not be used for the pipe within this min:mum sand. F 9 9 }! oured in the i e trench on the stretch of the trench. Additionally, a concrete dam should be p ~ p p nchor CB. This concrete "dam should be poured under and downstream, western, side of the A would be d extend to within a roximately 2 feet of the f~nai ground surface. It , around the pipe an pp nch so that there ~s direct im octant that an loosened soil be removed from the bottom of the tie p y ~ rbed soil. contact between the concrete "dam" and the und~stu GEOT~CH CONSULTANTS, lNC. JUG 1 T.1U`: Bosworth Noedemaker June 6, 2007 05289 Page 2 Please contact us if you have any questions regarding this letter or if we can be of further assistance. Respectfully submitted, GE~TECH CONSULTANTS, INC. yra~.u~,. ~, 'r gib' ,,,~,~`aT 'r . , ~ , ~'' ;~'; . yt~ ~,~. ";~,~, ~ .~ ,+.: f: ;Tb~,_CG~ ~~.~i4irj~ V ~,~ ~' ., ~ . ~~~ ~ ~ ~. ~. ~. V ~- ~ v Marc R. McGinnis Principal MRM:jyb ~ r~.r~ ~ ~ f ~ v ~~ ~ ~ ~ ~. ~ ~ ~ ~ I i ~r.,1 ~ ~ .r ~ ~~. ~ ~ ~ ~~i: 1 /~ '~ I„ ,r r~ 'L,, ~'~U ~ '~ '", GEOTECH CONSULTANTS, INC.