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13 July 2001 • AGE-NC Project No 96-0232 ' Page 11 of 15 I second quarter 2001 analytical results of ground water morutonng well samples are summarized in Tables 5 and 6 The laboratory reports (McCampbelI Analytical Inc I D Nos 69751 through 69776 and 69938 through 69958) and chain-of-custody forms are presented in Appendix H I 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 units are defined as First 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 second quarter 2001 update letter(Second Quarter Update on Annexation to Community Service Area No 31, dated 06 July 2001) has been prepared by Rishwain & Rishwam, attorneys for the Bokides Family Limited Partnership, concerning the progress of the annexation of the Rocky's lie Restaurant property into San Joaquin County Community Service Area No 31 (Appendix J) According to the second quarter 2001 update letter, Mr Tom Gau of San Joaquin County Public Works is currently looking into the possibility of connecting to water services without formally connecting to sewer services The results of pump and treat ground water remediation between 01 April and 30 June 2001 are as ' follows • Approximately 2,395,645 gallons of MTBE-impacted ground water were selectively ' extracted from wells EW-2, EW-4, EW-5, EW-6, EW-7, EW-8, EW-9 and EW-10, which are completed in the First Zone aquifer ' • A total volume of approximately 5,875,416 gallons of MTBE-impacted water has been treated at the site since the start-up period in November 2000 • Laboratory analysis of four grab water samples collected at the effluent-end of the pump and ' treat system did not detect any constituents of concern • Dissolved MTBE was detected (utilizing EPA Method 8260M) in water samples collected ' from the extraction wells at concentrations between 1 1 and 140 yg/l, for two consecutive ground water monitoring events,the greatest MTBE-impact water was detected at extraction well EW-4 near the southwest portion of the site I • Dissolved MTBE was detected from grab samples collected at the influent-end of the itreatment system at concentrations between 28 and 140µg/1 IAdvanced GeoEnvsronmental,Inc I