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F <br /> Date: December 27, 1999 <br /> Quarter: 3Q99 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No.: 4493 Address: 205 North Center Street, Stockton, CA <br /> ARCO Environmental Engineer: Chuck Carmel <br /> Consulting Co./Contact Person: SECOR International Incorporated/Rusty Benkosky <br /> Consultant Project No.: 077.41819.002 <br /> Primary Agency/Regulatory ID No.: San Joaquin County Environmental Health Department <br /> Assembly Bill 681 Status: Property Owned by City of Stockton <br /> WORK PERFORMED THIS QUARTER (Third Quarter— 1999): <br /> 1. Performed third quarter groundwater monitoring event. <br /> 2. Prepared and submitted second quarter 1999 groundwater monitoring report. <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth Quarter- 1999): <br /> 1. Prepare and submit third quarter 1999 groundwater monitoring report. <br /> 2. Perform fourth quarter groundwater monitoring event. <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project: Monitoring/Assessment <br /> Frequency of Groundwater Sampling: MW-1 throughMW-4 are sammled quarterly. <br /> Frequency of Groundwater Monitoring: Quarterly <br /> Is Free Product(FP)Present On-Sits: No <br /> Current Remediation Techniques: Natural Attenuation <br /> Approximate Depth to Groundwater: 12.24 to 12.72 <br /> Groundwater Gradient: NA <br /> DISCUSSION: <br /> TPH-g,benzene,and MtBE were reported in one(MW4)of the two wells sampled this quarter at a concentrations <br /> of 4,880 ppb, 173 ppb,an 670 ppb,respectively. TCE was detected in both wells samples at concentrations of 54.4 <br /> ppb(MW-2) and 8.44 ppb(MW4). PCE was not detected in either well this quarter. Concentrations were <br /> consistent with historical data. Only two of the four wells were sampled this quarter. Stockpiled soil from <br /> construction activities on adjacent sites covered wells MW-1 and MW-3 and made them inaccessable. ARCO <br /> station demolition activities were completed in April 1999 and this site is currently vacant. <br />