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i I31 August 2000 AGE Project No 96-0232 Page 5 of 25 ' well serving Rocky's Restaurant The video probe revealed perforated well screen between 67 and 76 feet bsg, between 87 and 104 feet bsg and between 130 and 142 feet bsg, the bottom of the water well casing below 142 feet bsg was filled with silt Two ground water I pumps were removed from the well pnor to video camera probing activities, the bottom of the first pump(fire water)was set at 84 feet bsg and the bottom of the second pump (potable water) was set at 105 feet bsg AGE has been informed that the sanitary seal of the well is ' set at 50 feet bsg and that a gravel pack around the casing extends from 50 feet bsg to total depth of the well A report of findings(Quarterly Report-First Quarter 2000, dated 01 May 2000) documenting investigation activities performed in March 2000 was prepared by AGE ' and submitted to the PHS-EHD and the RWQCB • 28 March 2000- A six-inch diameter ground water extraction well (EW-1)was installed on- site to a depth of 33% feet bsg, neither soil nor ground water samples were collected during installation of EW-1 A report of findings (Quarterly Report-First Quarter 2000, dated 01 May 2000) documenting investigation activities performed in March 2000 was prepared by AGE and submitted to the PHS-EHD and the RWQCB • 28, 29 and 30 March 2000- Five soil bonngs (P 13, P 14, P 15, P 16 and P 17) were advanced on-site utilizing cone penetrometer testing (CPT) technology to characterize the geological 10 and hydro-geological framework and to assess preferential migration pathways Based on soil composition data obtained from the CPT soil borings, cross sections C-C', D-D'and E-E' I (Figures 5, 6 and 7) were constructed and cross sections A-A' and B-B' (Figures 3 and 4) were revised depicting the general subsurface soil composition on-site and off-site Based on the CPT soil characteristics data collected from P13, P14, P15, P16 and P17 AGE I identified five potential hydrologic units between surface grade and 150 feet bsg The hydrologic units were generally defined as the intervals from 5 to 35 feet bsg (First Zone), 40 to 60 feet bsg(Second Zone), 65 to 75 feet bsg(Rocky's Upper Zone), 95 to 105 feet bsg ' (Secondary Aquifer Zone), and 130 to 150 feet bsg (Primary Aquifer Zone) A report of findings (Quarterly Report- First Quarter 2000, dated 01 May 2000) documenting investigation activities performed in March 2000 was prepared by AGE and submitted to the ' PHS-EHD and the RWQCB • 28 March 2000- Ground water monitoring and sampling was performed on wells MW-1, ' MW-2,MW-4,MW-5,MW-6 and MW-7 General ground water flow direction was reported north-northeast and north-northwest at a general gradient of 0 003 Laboratory analysis of ground water samples detected MTBE at concentrations as high as 400 ,ug/l, BTEX ' compounds were detected in samples collected MW-1, MW-2, MW-6A and MW-6B at concentrations as high as 2 3 1,zg/1, TAME and ETBE were detected in samples collected from MW-1 and MW-2 at concentrations as high as 1 2 µg/1 Ethanol was detected in ' samples collected from MW-1,MW-2, MW-6A and MW-6B at concentrations as high as 50 yg/l,methanol was detected in the sample collected from MW-6A at a concentration of 420 yg/l A grab ground water sample collected from RDW-1 detected MTBE at a concentration I Advanced GeoEnvironmentaI,Inc