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Home My WebLink AboutGeoTech Final Inspection for BLD2010-00478 - BLD Engineering / Geo-tech Reports - 12/20/2010 �wv�rotech �wg%weer%wg ceotechv��cal Ewvtrov�w�ewtal G Dratwage G Roadway December 20, 2010 Bruce Larson PO Box 606 Tracyton, Washington 98393 RE: Geotechnical Final Inspection for Property Located at Tax Parcel Number 32236 75 00060, Mason County, Washington Dear Mr. Larson, Envirotech Engineering (Envirotech) completed a site visit and conclusions for the completed construction of a new single family residential structure located at the referenced tax parcel number. Multiple site visits were conducted for this project, with the most recent on December 17, 2010. Information pertaining to the project was provided by Mr. Larson, owner of the referenced property. Information collected from site observations, and field testing was completed by Michael Staten, P.E. with Envirotech. This inspection letter is to certify that all recommendations were adhered to as presented in the Geotechnical Report for this property that was prepared by Envirotech, dated May 19, 2010. Foundation certification was previously provided by Envirotech in a letter dated July 29, 2010. This letter included certifying adequate earthwork construction, and the proper placement of structural footings. Temporary and permanent erosion control appears to meet the intent of the geotechnical report. Although the cut slope behind the residence is exposed, the area is relatively small, the surface soils are coarse which inhibit erosion, and the areas downslope are adequately stabilized to prevent sediments from leaving the property. Building setbacks and vegetation buffers conform to the direction of the geotechnical report. Buildings were not constructed, or the removal of vegetation was not completed on slopes exceeding 40% grades. Drainage recommendations appeared to be adequately addressed for this property. Two infiltration trenches for roof and foundation runoff appear to be sized and placed in accordance with the geotechnical report. 74 NE Ht rd Road ge�fa%r, was11%vu�tov�,98528 off: 360-2YE5_93'-4 Cell.: 3rv0-c g9-6045 FOX: 300-275-4729 ewv%rotecti@aeotech vuca li,v�,f o.cows. Envirotech concludes that the intent of the aforesaid geotechnical report has been adequately followed. If you have any questions or need any further assistance, please contact Michael Staten at 360-275-9374. Sincerely, Envirotech Engineering CLYDE S ST O� 43045 cv� ASSr�NA(,E��'` Michael Staten, P.E. Project Director Pagc 2of 2 t _ 1 S ' . # �In,v%rotecl� �In,giln,eer�ln,g - ,reoteol vdr,al o Ev�,,Arovuvu.evktal o DKC?uLage Roadway July 29, 2010 Bruce Larson PO Box606 1�. TracytGn, Washington RE: Foundation Bearing Assessment for Property Located at Tax Parcel Number 32236 75 00060, Mason County, Washington Dear Mr. Larson, Envirotech Engineering (Envirotech) completed a site visit and conclusions for the planned foundation bearing strata for a typical single family residential structure located at the referenced address. The site visit was conducted on July 29, 2010 in order to observe the soil conditions, and assess the suitability of the founding soils for use as bearing strata. Information pertaining to the project was provided by Mr. Larson, owner of the referenced property. Information collected from site observations, and field testing was completed by Michael Staten with Envirotech. The foundation bearing soils appear to be entirely on relatively undisturbed native soils. These soils were primarily a Silty Sand with Gravel (SM) and Poorly Graded Sand with Gravel (SP) as determined in the geotechnical report for this property. The bearing stratum was field measured to be dense. Relative density was assessed by measuring the resistance of hand tools within several locations of the planned building pad. It is concluded that the existing bearing soils and conditions are suitable for a structural pressure of no more than 1500 psf for continuous foundation widths of at least 16 inches. The foundation system may undergo a maximum of 1.0 inch total settlement, and a maximum differential settlement of 0.75 inch. The conclusions presented above were derived from engineering judgment using geotechnical standards in conjunction with the information collected from the site visit and owner of the Project. Excessive free moisture should be prevented from entering the foundation excavation prior to the placement of concrete. If excessive moisture is permitted within the excavation, or the founding subgrade is significantly disturbed prior to constructing the concrete footings, an additional geotechnical inspection is required. 74 NE Ffkrd Road gelfalr, waskCv,gtov�98528 f f.c 360-27 5-9374 Cell: 36D-689-60¢5 FOX: 360-27.5-4y'89 evvv�ratech@Qeotech vuca l�v�,fo.cow� S If you have any questions or need any further assistance, please contact Michael Staten at 360- 275-9374. Sincerely, Envirotech Engineering CLYD�S 7/29PO +0�+0 kF 43045 A GIs �sSjoNAt Michael Staten, P.E. Project Director Page 2of 2 �wv�rotech �wg%weer%wg - ceotecllwicaL° Ewvirowwiewtal °DYa%wage ° R.Oadwal� July 29, 2010 Bruce Larson PO Box 606 `7 5`/ Sig 1 c_► : Tracyton, Washington 983W, RE: Foundation Bearing Assessment for Property Located at Tax Parcel Number 32236 75 00060, Mason County, Washington Dear Mr. Larson, Envirotech Engineering (Envirotech) completed a site visit and conclusions for the planned foundation bearing strata for a typical single family residential structure located at the referenced address. The site visit was conducted on July 29, 2010 in order to observe the soil conditions, and assess the suitability of the founding soils for use as bearing strata. Information pertaining to the project was provided by Mr. Larson, owner of the referenced property. Information collected from site observations, and field testing was completed by Michael Staten with Envirotech. The foundation bearing soils appear to be entirely on relatively undisturbed native soils. These soils were primarily a Silty Sand with Gravel (SM) and Poorly Graded Sand with Gravel (SP) as determined in the geotechnical report for this property. The bearing stratum was field measured to be dense. Relative density was assessed by measuring the resistance of hand tools within several locations of the planned building pad. It is concluded that the existing bearing soils and conditions are suitable for a structural pressure of no more than 1500 psf for continuous foundation widths of at least 16 inches. The foundation system may undergo a maximum of 1.0 inch total settlement, and a maximum differential settlement of 0.75 inch. The conclusions presented above were derived from engineering judgment using geotechnical standards in conjunction with the information collected from the site visit and owner of the Project. Excessive free moisture should be prevented from entering the foundation excavation prior to the placement of concrete. If excessive moisture is permitted within the excavation, or the founding subgrade is significantly disturbed prior to constructing the concrete footings, an additional geotechnical inspection is required. 74 NE I}urd Road gelfnLr, wash%wutov�y8s28 off: 360-275-9374 Cell.: 360-689-604.5 FOX: 360-275-478 y e�.v�ratech@aeotechvu.cali,vi,fo.cow�. If you have any questions or need any further assistance, please contact Michael Staten at 360- 275-9374. Sincerely, Envirotech Engineering CLYDg S WAS Tq�� 43045 �iD FC/ST- �S810NAI-' G` Michael Staten, P.E. Project Director Page 2of 2