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Roject No. 1281 <br /> I lOct01 <br /> detention vault, and small open-cell detention ponJ are proposed m this location. A <br /> concrete retaining wall (maximum height of 4 feet) will support parkmg lot 611s. The <br /> detention pQnd bottom will be constructed at Elev. 61. Pond construction includes <br /> maximum cuts and berm fills ranging to about 4 feet and 7 feei, respectively_ A 6-foot <br /> high (maximum) concrete retaining wall is proposed adjacent to the southeastem edge of <br /> the new parl.ing arca. <br /> 7'he recorr�mendations in the following sections of this repori are based on oiv <br /> understand'mg of the project's de�ign features. We should review final design drawings <br /> and specifications to verify that our recommendations hav� bcen properly interpreted and <br /> incorporated intn project design. <br /> 3.0 PREVIOUS EXPLORA770NS <br /> The following arc previous explorations used in cur analyses that were completed on or <br /> in the immcdiate vicinity oCthe project property: <br /> • Garih Consultants, Inc., "Geotechnical Fngineering Study Proposed COSTCO <br /> Retail Gasoline Facility,"dated 13Jan99. <br /> • GeoEngineers, lnc., "Rcpori, Geotechnical Engineering Services, Proposed <br /> COSTCO Wholesale Warchouse, Gverett, Washington,"dated 29Jun93 <br /> L'xplorotion logs (TP-2 and TP-9) from the GeoEngineers report that wete near the <br /> projecl areas are presented in Appendix B. TP-2 and TP-9 are shown on Figures 2A and <br /> 2[3, and were approximatcly located on our site plan by scaling thc locations of£of the <br /> GcoEngineers drawing. <br /> 4.0 SCOPE OF SERVICES <br /> (hu scope of work for this project included drilling 3 hollow-stem auger test borings, <br /> laborato.ry testing on select wil samples, completing analyses based on the site <br /> conditions, and providing geotechnical engineering recomtnendations for the proposed <br /> stormwater improvements project. Spccifically, this report addresses: <br /> • Site clearing, grading, and subgrade preparation <br /> • Structural fill considcrations <br /> • Geotechnical parameters for detention vault and pond design and cons�ruc.�ti�n <br /> • Retaining wall design parameters <br /> • Excavations <br /> • 1'avements <br /> • Subsurfacc drainagc <br /> • Erosion control <br /> Gwtechnical and'I'unncl Fs�ncers � <br /> 3050125°iAvcNG phme(425)869-5778 Z <br /> 13cllcwr,WA9S005 Page2 Fu (�I25)861-0677 <br />