Laserfiche WebLink
1 <br /> ' 14 February 2003 <br /> . AGE-NC Project No 98-0432 <br /> ' Page 2 of 6 <br /> ' Soil samples were collected ahead of the drill bit using a California modified split-spoon sampler <br /> loaded with three pre-cleaned 2-inch by 6-inch brass sleeves The samples were collected from <br /> monitoring well pilot borings MW7 and MW8 at five-foot intervals, beginning at 5 feet below <br /> ' surface grade (bsg) in well MW-8 and 10 feet bsg in well MW-7, using a 140-pound hammer to <br /> advance the sampler The number of blows required to advance the sampler over each 6-inch <br /> increment of the 18-inch sampling interval was recorded on the boring logs Sampling equipment <br /> was washed in an Alconox solution and rinsed with water prior to each sampling run to minimize <br /> cross-contamination <br /> For each sample,both ends of the leading or other selected sleeve were covered with Teflon sheets, <br /> capped and sealed with tape The samples were properly labeled and stored, but were not required <br /> for laboratory analysis <br /> 212 Logging <br /> Soil was extruded from a second brass sleeve and was then visually described in accordance with <br /> 0 the Unified Soil Classification System (see Appendix A) <br /> 1 2 1 3 Well Completion and Well Head Survey <br /> Pilot borings MW7 and MW8 were completed as ground water monitoring wells using two-inch <br /> diameter PVC casing with 0 020-inch slotted screen installed from approximately 10 feet to 30 feet <br /> bsg, with blank casing extended to the surface The filter pack(No 3 Lonestar sand)was installed <br /> from approximately 8 feet to 30 feet bsg in the well borings A nominal 1 or 2-foot bentonite chip <br /> plug was installed above the filter pack and hydrated The wells were then grouted to near the surface <br /> with portland cement,and water-tight,traffic-rated well boxes were installed over the wells As-built <br /> y <br /> well diagrams are depicted on the boring logs in Appendix A <br /> ' On 22 November 2002, a California state-licensed survey engineer from Baumbach&Piazza, Inc <br /> surveyed the elevation at the top of the well casing of monitoring wells M W 5 through MW8 to the <br /> ' nearest 0 01-foot relative to City of Manteca Bench Mark#63, surveyed at 33 76 feet above mean <br /> sea level(MSL) The results of the monitoring well survey are contained in Table 1 The surveying <br /> report (Baumbach &Piazza, Inc) is presented in Appendix B <br /> 1 <br /> ' Advanced GcoEnvironmental,Inc <br /> 1 <br />