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I IQuarterly Report - Third Quarter 2003 CALIFORNIA FUELS CARDLOCK STATION I2402 Pacific Avenue, Stockton, California 1.0 INTRODUCTIION I At the request of Mr David Atwater, Advanced GeoEnviromnental, Inc (AGE) has prepared this quarterly report documenting the procedures and results for third quarter 2003 ground water monitoring event performed at 2402 Pacific Avenue(the site), Stockton, California,the report also I documents June,July,August and September 2003 progress of the in-situ air sparging(IAS)and soil vapor extraction (SVE) recovery system The objectives of the site activities were to monitor dissolved petroleum hydrocarbon concentrations in ground water, to assess ground water flow direction and gradient and to monitor the progress and effectiveness of SVE and IAS remediation at the site The site setting is illustrated on Figure 1 Site structures and monitoring well locations are depicted on Figure 2 This reporthas been prepared in accordance with guidelines issued by the California Regional Water Quality Control Board(RWQCB)-CentraI Valley Region for investigation of underground storage tank(UST)sites A summary of previous investigations at the site was included in the AGE-prepared Corrective Action Plan-May 1998,dated 05 May 1998 Analytical data acquired to date is included in this report I 2.0. GROUND WATER MONITORING AND SAMPLING PROCEDURES On 23 September 2003, ground water monitoring was performed at the site on single-level wells MW-1 through MW-12, multi-level well MW-13 (A, B and C) and air sparge wells AW-1 (A and B) and AW-2 (A and B) Ground water monitoring procedures for the site were outlined in Work Plan Addendum, dated 16 May 2000 and conform to ground water monitoring guidelines issued by I the San Joaquin County Environmental Health Department(SJCEHD) As built construction details of all monitoring wells are summarized in Table I ' 2 1 WELL MONITORING AND EVACUATION PROCEDURES The depth to ground water was measured at each well from the tops of the well casings to the nearest 0 01-foot,utilizing a Solmst water level meter Ground water elevation at the site was calculated by subtracting the measured depth to ground water from the surveyed well casing elevations(Table 1) ' Ground water elevations were plotted and contoured on a scaled site map (Figure 3) After water levels were measured,approximately 2 to 9 gallons of groundwater(a mimmurn of three casing-water volumes per well)were evacuated(purged) from single-level monitoring wells MW-1 through MW-12,and air sparge wells AW-1 A and AW-2A utilizing disposable polyethylene bailer Temperature, pH and conductivity of purged water were measured from each well for stabilization I I