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p 1 i Quarterly Report - First Quarter 2003 NOMELLINI CONSTRUCTION CO. 1045 West Charter Way, Stockton, California ' 1.0. INTRODUCTION ' Advanced GeoEnvironmental, Inc (AGE)has prepared flus quarterly report for 1045 West Charter , Way(the site), Stockton,California The scope of work included performance of a quarterly ground ' water monitoring event and preparation ofthis report The objectives were to monitor concentrations ' of petroleum hydrocarbons in ground water and to characterize ground water flow direction and gradient at the site The site setting is illustrated in Figure 1 Site structures and monitoring well locations are depicted in Figure 2 ' In accordance with a telephone conversation with Mr Mike Infurna of the San Joaquin County Environmental Health Department(SJCEHD) on 03 June 2003, a work plan addendum is included ' with this report in Appendix A to further assess the lateral and vertical extent ofpetroleum-imp acted soil and ground water at the site ' This report is prepared in accordance with guidelines issued by the California Regional Water Quality Control Board-Central Valley Region(RWQCB)for investigation of underground storage tank (UST) sites Background information is summarized in the AGE-prepared Revised Remedial Action Work Plan, dated 15 April 1997 Ground water analytical data acquired to date is included in this report I 2.0. PROCEDURES On 07 March 2003, ground water monitoring was performed at the site on wells MW-1 through MW-7, ground water monitoring well MW-8 was buried and could not be located As-built I monitoring well construction details are summarized in Table 1 Ground water monitoring procedures for the site were outlined in the AGE-prepared Interim Work Plan, dated 10 July 1995, and approved by San Joaquin County Environmental Health Department(SJCEHD)by letter dated 17 July 1995 2 1 WELL MONITORING AND PURGING Depth to ground water was measured in each well from the top of the well casing to the nearest 0 01-foot utilizing a Solinst water level meter The ground water elevation in each well was calculated by subtracting the measured depth to ground water from the surveyed casing elevation (Table 2) Ground water elevations were plotted and contoured on a scaled site map (Figure 3) • After water levels were measured, approximately 11 to 17 gallons of ground water(a minimum of ' three casing-water volumes per well) were purged from wells MW-1 through MW-7 utilizing Advanced GeoEavironmental,Inc.