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' 15 January 2002 AGE-NC Project No 96-0232 ' Page 10 of 16 ' MW-12A, MW-13A and MW-13C contained significant diesel range compounds, the laboratory indicated the sample chromatogram from MW-13A contained significant oil range compounds and heavier gasoline range compounds ' Benzene was detected in a water sample collected from well MW-13A at a concentration of 17µg/l, toluene was from well MW--12A at a concentration of 0 55 µg/1 No other BTEX compounds were ' detected in any of the samples collected during December 2001 MTBE (utilizing EPA Method 8020) was detected in water samples collected from wells MW-7, MW-9A, MW-11A, MW-11B, MW-11D,MW-12A,MW-13A, EW-4,EW-5,EW-9, EW-10 and RDW-1 at concentrations as lugh ' as77'20µg/l (MW-11B) ' MTBE(utilizing EPA Method 8260)was detected in water samples collected from monitoring wells MW-7, MW-9A, MW-11A, MW-11B, MW-1113, MW-12A, MW-13A and RDW-1 at concentrations as high as 120 µg/1 (MW-I IB), isoconcentration maps displaying the estimated ' extent of dissolved MTBE in First Zone and Second Zone aquifer are depicted in Figures 7 and 8 MTBE was detected in water samples collected from extraction wells EW-4, EW-5, EW-6, EW-8, EW-9 and EW-10 at concentrations as high as 53 ,ug/l (EW-4), an isoconcentration map displaying liethe estimated extent of dissolved MTBE in the area of the ground water extraction wells is depicted in Figure 9 ' No other constituents of concern were detected above laboratory reporting limits in the water samples collected during the third quarter 2001 sampling event Site investigation and the current fourth quarter 2001 analytical results of ground water monitoring well samples are summarized in Tables 5 and 6 The laboratory reports (McCampbell Analytical Inc I D Nos 86096 through 86122, 86486 through 86501, 86931 and 86932) and chain-of-custody forms are presented in Appendix H 4.0. SUMMARY OF FINDINGS FROM QUARTERLY ACTIVITIES Previous soil characteristics data obtained by a CPT investigation enabled AGE to define five informal hydrologic units (Final Remediation Plan, dated 31 August 2000) The informal hydrogeologic wets are defined as Fust Zone(5-35 feet bsg), Second Zone(40-60 feet bsg),Rocky's Upper Zone (65-75 feet bsg), Secondary Aquifer Zone (85-105 feet bsg), and Primary Aquifer Zone (130-150 feet bsg) The Rocky's Upper Zone is the shallowest ground water zone screened in the Rocky's domestic drinking water well A fourth quarter 2001 update letter(Fourth Quarter Update on Annexation to Community Service Area No 31, dated 15 January 2002)has been prepared by Rishwain & Rishwain, attorneys for the Bokides Family Limited Partnership, concerning the progress of the annexation of the Rocky's Restaurant property into San Joaquin County Community Service Area No 31 (Appendix J) Advanced GeeEnvironmental,inc