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Date: May 10,2004 <br /> Quarter I"Quarter,2004 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 02093 <br /> Address 3425 Tracy Blvd , Tracy, California <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person URS/Vernon Elarth <br /> Consultant Project No 38466457 OL058 <br /> Primary Agency/Regulatory ID No Sart Joaquin County Environmental Health Department SJCEHD <br /> Assembly Bill 681 Status Property owned by Atlantic Richfield Company <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 on AS systems <br /> 4 Groundwater Extraction Well TEX-1 was destroyed January 26,2004 <br /> 5 Morrow Surveying surveyed site monitoring wells February 9,2004 <br /> 6 Well Destruction Report for TEX-1 was submitted to SJCEHD February 19,2004 <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 on AS system <br /> QUARTERLY RESULTS SUMMARY (First 2004). <br /> Current Phase of Project Mon itonn /Remediation <br /> Frequency of Groundwater Sampling ATR-2, ATR-4, ATR-5,ATR-7,ATR-8, and ATR-12 <br /> sampled quarterly, ATR-1,ATR-3, ATR-6, ATR-9, ATR-10, <br /> and ATR-11 sampled 1" and 3'd quarters only <br /> Frequency of Groundwater Monitoring Quarter! <br /> Is Free Product (FP) Present on Site No <br /> FP Recovered this Quarter None <br /> Cumulative FP Recovered to Date <1 gallon <br /> Current Remediation Techniques _ Air Sparging (SVE system currently off) <br /> TPHG removed by SVE this Quarter None <br /> Cumulative TPHG Removed 3,616 6 lbs <br /> Approximate Depth to Groundwater 8 79 tol 2 84 ft <br /> Groundwater Flow and Gradient Northeast to East at 0 005 to 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 /> isanalytes within the requested carbon range resulting in a higher concentration being reported Where the resulting <br /> K IWp--ssV5 SP ARCUM0931Quar=erly\1 QTR 04\2093 GWMR IQ04 doc Page 1 <br />