Laserfiche WebLink
Date December 22,2004 <br /> 4 <br /> Quarter' 4's Quarter,2004 <br /> . ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 11194 <br /> Address 2375 Tracy Blvd, Tracy, CA <br /> ARCO Environmental Engineer Kyle Christie <br /> Consulting Co/Contact Person URS/Jeff re Brooks <br /> Consultant Project No 38466552 OL058 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health Department <br /> Assembly Bill 681 Status Property owned by Conoco Phillips <br /> WORK PERFORMED THIS QUARTER (Fourth 2004): <br /> 1 Performed quarterly groundwater monitoring and sampling according to modified schedule <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> WORK PROPOSED FOR NEXT QUARTER (First 2005): <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> QUARTERLY RESULTS SUMMARY (Fourth 2004): <br /> • Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling MW-4, MW-6, MW-7, AMW-3, AMW-5, and AMW-6 <br /> sampled Quarterly, MW-1, MW-2, MW-3, MW-5, MW-8, <br /> AMW-1,AMW-2, and AMW-4 Annually 3'd Quarter <br /> Frequency of Groundwater Monitoring All Wells Quarterly <br /> Is Free Product (FP) Present on Site No <br /> FP Recovered This Quarter NA <br /> Cumulative FP Recovered to Date NA <br /> Approximate Depth to Groundwater 4 48 to 7 49 feet below ground surface (bgs) <br /> Direction of Groundwater Flow Northwest - <br /> Groundwater Gradient 0 006 feet/foot ft/ft <br /> ANALYTICAL DATA REVIEW: <br /> Based on the review of the analytical and hardcopy data (chain-of-custody records, blanks, dilutions, holding times, <br /> LCS/LCSD results,MS/MSD results, and surrogate recoveries),the data are acceptable as reported by the laboratory <br /> with the following]mutations <br /> • The reported result for gasoline range organics(GRO) in sample MW-6 may be biased high as demonstrated by <br /> a high surrogate recovery due to matrix interference <br /> • The elevated reporting limits were the result of dilutions performed by the laboratory in order to quantitate a <br /> target analyte <br /> • <br /> K%WPTOCeSSV5BPARCO1111941QuanerlyV00414QTR 04\11194GWMR4QO4dm Page 1 <br />