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05 February 2001 <br /> AGE-NC Project No. 98-0468 ; <br /> ' Page 2 of 7 i <br /> using a 140-pound hammer to advance the sampler. The number-of blows required to advance the <br /> ' sampler over each 6=inch increment of the 18-inch sampling interval was recorded on the boring <br /> logs. Sampling equipment was washed in an Alconox solution and rinsed"with water prior to each <br /> tsampling run to minimize cross-contamination: ; <br /> For each sample,both ends.of the leading,or other selected sleeve were covered with Teflon sheets, <br /> j capped and sealed with tape. The sampleswere labeled, stored on ice and transported under chain-of- <br /> custody to McCambell Analytical,Inc. (MAI), a State of California Department of Health Services <br /> (DHS)-certified analytical.laboratory. ; <br /> 2.2. LOGGING <br /> ' Soil was extruded from a second•brass sleeve or from the p <br /> un reserved portions of.the soil in the core <br /> P <br /> barrel samples.and were screened for the presence of organic vapor using an organic vapor meter <br /> (OVM) equipped with,,a photo-ionization detector-(PID: Thermo Environmental 580A, 10.0 eV, <br /> calibrated to isobutylene),and the OVM readings were recorded on,the boring log. The soil was then <br /> visually described in accordance with the Unified Soil.Classification System (see Appendix A). <br /> 2.3. WELL AND'BORING COMPLETION. <br /> Boring MW6 was completed as a depth discrete ground water monitoring-well MW-6,'using two- <br /> inch diameter PVC casing with 0.020-inch slotted screen installed from approximately 35 feet to 40 <br /> ' feet bsg and with blank.casing.extended t_. urfacehe_filter pack..- o:2112 Lonestar sand)'was. <br /> installed in the soil boring fro dT0 feet to approximately 32 feet bsg. A nominal 2-foot bentonite <br /> chip plug was then installed above the filter acrla--nUWy—&­Rred. <br /> Borings MW7 and MW8 were completed as ground water monitoring wells-MW-7 and MW-8 using . <br /> ' .two-inch'diameter.PVC casing with 0.020-inch slotted-screen installed from approximately 5 feet <br /> to 20 feet bsg and with blank casing'extended to-the surface. The filter pack(No: 2/12 Lonestar sand) <br /> was installed in each soil boring from 4 feet to approximately.-20 feet bsg. A,nominal 2-foot <br /> ' bentonite chip plug was'then installed above the f lter pack and hydrated. <br /> The wells were then grouted to near the surface with Portland cement. Water-tight, traffic-rated.well, <br /> ' boxes were then installed over the e wells. As-built well diagrarns are depicted on the boring logs in, <br /> Appendix A. <br /> ''. Advanced GeoEnvironmental,Inc. <br /> 1 <br />