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`I A,. <br /> • 30 July 2003 y <br /> AGE-NC Project No.'-98-0504 <br /> -Page 4 of 7 <br /> 5 1', <br /> Soil samples were collected from the soil borings of five=foot iitervals <br /> -, . . begiuiing at 5 feet bsg. m .`.. <br /> borings MW-1 throu MW-3The samples.were collectedwith aCaliforma-riiodifed.split soon <br /> { <br /> sainpler.loaded with three clean, 2-inch by 6-inch'btass sleeves.A 140-p9und hammer was,used to , <br /> advance the_sampler_18-inches;_the_number-'of blows,requir'd"foiadvance'the sampler over each <br /> 6-inch increment was recorded on the boring <br /> -logs. Sam lin 'e ui'ment was washed in an Alconox <br /> . g P gqP <br /> solution and rinsed with water prior to each sampling run to'minimize cross contamination. <br /> For,each,sample,both ends,ofthe leading oT other selected sleeve were covered with Teflon sheets, <br /> capped and sealed with tape. .. <br /> E , , 32 SOIL,LOGGING ' <br /> After sample'preservation;,soil was extruded' from,the remaining sleeves .and screened'for the <br /> presence of organic vapor using an organic vapor analyzer(OVA)equipped with a photo-ionization <br /> ' <br /> detector.(PID: Thermo Environmental 580B, 10.0 eV, calibrated to isobutylene). The soil was also <br /> described in accordance with the Unified Soil Classification System.Soil boring logs exhibiting'soil <br /> profiles are depicted in Appendix A. �� rte �e 'ri of.i vl d-ual+- :ri' <br /> 64-43 <br /> 3.1' MONITORING WELL INSTALLATION AND DEVELOPMENT. <br /> Pilot borings MW-I through MW-3 were completed as.ground water monitoring wells using ' <br /> two-inch diameter PVC casing with 0.020-inch slotted screen installed from 25 to 45 feet bsg in <br /> borings MW-I-through,MW-3 with blank casing extended-to the surface.•A filter pack (No. 3 <br /> Lonestar"sand)was installed from approximately 23 to 45 feet bsg in wells MWA through MW-3. <br /> A nominal 2- to 37foot bentonite chip plug was then installed above'the filter pack and hydrated., <br /> Afterwards,.the remaining annular space was backfilled to within-six inches of surface grade with <br /> portland cement,•and a traffic-rated well box'(8-inch diameter).was installed over` each well in <br /> accordance with San Joaquin County regulations.Monitoring well design specifications are depicted' <br /> in Appendix A. y <br /> Main <br /> ;r� S. r., o,► <br /> 3A. GROUND WATER DEVELOPMENT AND SURVEY ACTIVITIES V m <br /> ' On 07April 2003, ground water well development activities were performed'at the site in order to <br /> increase water flow into the well andlto minimize the,amount of fine-grained sediment drawn into ..� <br /> the well during pumping or bailing. <br /> Advanced GeoEnvironmenial,Inc., <br />