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1 � ' 20 December 2002 AGE-NC Project No 95-0185 ' Page 5 of 7 ' The remaining annular space was filled to within one and one-half foot of the ground surface with a cement grout The grout mixture consisted of type VII portland neat cement and not more than six gallons of water per 94-pound sack of cement As-built ozone-sparge point/monitoring well- construction diagrams are included in Appendix C ' 2 3 5 Equipment Decontamination The hollow stem augers were steam cleaned prior to each bore-hole advancement Sampling tools ' and brass sleeves used for sample collection were thoroughly washed with a solution of Alconox, and were thoroughly rinsed with clean tap water prior to each sampling run Following drilling activities, nnseate generated from decontaminating the equipment was placed in properly labeled ' DOT-approved model 17H 55-gallon drums and was stored on-site In an area lacking public access ' 2 3 6 Well Elevation Survey On 22 November 2002, a California state-licensed survey engineer from Baumbach&Piazza,Inc ' surveyed a reference point on the casing tops of the monitoring wells to the nearest 0 01-foot relative to San Joaquin County Bench Mark Datum BM # LM-38 6 The results of the monitoring well ' survey are contained in Table 1 The surveying report (Baumbach & Piazza Job No 9797) is presented in Appendix D 1 3.0. FINDINGS ' The stratigraphy and ground water elevation, gradient and flow direction were determined from the field data Contaminant impact to soil and ground water were assessed by laboratory analysis ' 31 STRATIGRAPHY ' The soil consisted predominantly of tan-brown silt from a depth of approximately 5 feet to 20 feet bsg Tan silty sand was encountered at depths of 5 and 25 feet bsg, and poorly graded saturated sand was encountered at the total depth of soil boring MW-5 (30 feet bsg) Soil boring logs and well construction diagrams are depicted in Appendix C 1 ' Advanced GeoEnVLronmental,Inc