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11 February 2002 <br /> AGE-NC Project No 99-0559 <br /> Page 5 of 10 <br /> pellets were placed above the filter pack to the next screen Interval This process was continued to <br /> above the last screen Interval, the remaining annular space was filled to the ground surface with a <br /> cement grout The grout mixture consisted of Type I/H portland neat cement with not more than 6 <br /> gallons of water per 94-pound sack of cement The grout was placed by pumping through the center <br /> of the hollow stem augers <br /> Each of the CMT monitoring wells (MW-5 through MW-8) was completed utilizing the same <br /> construction procedures for each Individual well A generalized design of the CMT wells is <br /> presented in Figure 7 and Appendix B <br /> 2 7 DEVELOPMENT AND SURVEY OF MULTI-LEVEL MONITORING WELLS <br /> On 12 October 2001, AGE personnel developed CMT monitoring wells MW-5 and MW-6 On 15 <br /> October 2001, AGE personnel attempted to developed CMT monitoring well MW-8,but failed to <br /> ifinish the development, prior to the sampling event <br /> Development of CMT monitoring wells MW-5 and MW-6 was performed by purging three times <br /> the well casing volume of ground water for each individual well Purge water was extracted by <br /> lowering and raising a 318-mch outer diameter, length-discrete polyethylene hose equipped with a <br /> ball-valve water tip through the top chamber Into the water-charged screen section All purge water <br /> was containerized in properly labeled DOT-approved 55-gallon drums,and stored on-site in an area <br /> lacking public access <br /> On 24 October 2001, a California state-licensed survey engineer from Baumbach & Piazza, Inc <br /> surveyed a reference point on the casing tops of wells MW-5 to MW-8 to the nearest 0 01-foot <br /> relative to the City of Stockton Bench Mark Datum BM # 361 (elevation 33 79') The surveying <br /> report (Baumbach & Piazza Job No 9797) is presented in Appendix B <br /> 3.0. FINDINGS <br /> Computer generated CPT soil descriptions augmented with previously obtained soil sample <br /> descriptions were utilized to construct the vertical and lateral geologic model, laboratory analysis <br /> of soil and ground water samples was utilized to assess the hydrocarbon-impact on the two media <br /> 31 STRATIGRAPHY <br /> . Based on the findings from the CPT soil bonngs CPT I, CPT2 and CPT3, MW5 and previous soil <br /> boring logs, interpretive cross sections C-C' and D-D' were constructed to depict general lithology <br /> Advanced GeoE nvi ron mental,Inc <br />