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Date: May 17,2004 <br /> Quarter: l5t Quarter,2004 <br /> • ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No.: 548 <br /> Address: 1612 Hammer Lane, Stockton, CA <br /> ARCO Environmental Engineer: Paul Supple <br /> Consulting Co./Contact Person: URS/Vernon Elarth <br /> Consultant Project No.: 38466395.01-058 <br /> Primary Agency/Regulatory ID No.: Lori Duncan, San Joaquin County Environmental Health <br /> Department <br /> WORK PERFORMED THIS QUARTER (First 2004): <br /> 1. Performed quarterly groundwater monitoring and sampling. <br /> 2. Prepared and submitted quarterly groundwater monitoring report. <br /> 3. Performed operation and maintenance of the SVE and AS systems. <br /> WORK PROPOSED FOR NEXT QUARTER (Second 2004): <br /> 1. Perform quarterly groundwater monitoring and sampling. <br /> 2. Prepare and submit quarterly groundwater monitoring report. <br /> 3. Perform operation and maintenance of the SVE and AS systems. <br /> QUARTERLY RESULTS SUMMARY (First 2004): <br /> Current Phase of Project: Remediation <br /> Frequency of Groundwater Sampling: Wells MW-1 through MW-6 and VW-1 through VW-4, <br /> VW-5S, and VW-51D sampled Quarter) <br /> Frequency of Groundwater Monitoring: Quarter) <br /> Is Free Product(FP) Present Onsite: No <br /> FP Recovered this Quarter: None <br /> Cumulative FP Recovered to Date: 7 gallons <br /> Current Remediation Techniques: Soil vapor extraction and airs ar ing <br /> Approximate Depth to Groundwater: 10.27 to 30.66 ft <br /> Groundwater Flow and Gradient: Southeast @ 0.006 ft/ft <br /> ANALYTICAL DATA REVIEW: <br /> Please note that during 2003, the laboratory has changed Total Petroleum Hydrocarbons as Gasoline (TPHg) to <br /> Gasoline Range Organics (GRO). The resulting data may be impacted by the potential inclusion of non-TPHg <br /> analytes within the requested carbon range resulting in a higher concentration being reported. Where the resulting <br /> GRO concentration is based on a single analyte(i.e.,a non-TPHg analyte or a single TPHg analyte),the analyte will <br /> be identified if possible. <br /> K:%Wproc ssU5 BP ARC010054MQ.Wr rly5l QTR 04\548 cWMR 1 Q04.&c <br /> Page 1 <br />