Laserfiche WebLink
• <br />L� <br />Date: October 31, 2003 <br />Quarter 3'4 Quarter, 2003 <br />ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br />Facility No <br />Address <br />Environmental Engineer <br />Consulting Co /Contact Person <br />Consultant Project No <br />Primary Agency/Regulatory ID No <br />Assembly Bill 681 Status <br />4493 <br />205 N Center St , Stockton, CA <br />Paul Supple <br />URSNernon Elarth <br />38466267 0L058 <br />San Joaquin County Environmental Health Department <br />(SJCEHD) <br />Property owned by City of Stockton <br />WORK PERFORMED THIS QUARTER (Third 2003): <br />1 Performed quarterly groundwater monitoring and sampling <br />2 Prepared and submitted quarterly groundwater monitoring report <br />WORK PROPOSED FOR NEXT QUARTER (Fourth 2003)- <br />1 Conduct quarterly groundwater monitoring and sampling <br />2 Prepare and subnut quarterly groundwater monitoring report <br />3 Conduct an investigation to assess the vertical migration of petroleum in the source area and the lateral extent <br />down gradient <br />QUARTERLY RESULTS SUMMARY (Third 2003): <br />Current Phase of Project <br />Frequency of Groundwater Sampling <br />Frequency of Groundwater Monitoring <br />Is Free Product (FP) Present Onsite <br />Current Remediation Techniques <br />Approximate Depth to Groundwater <br />Groundwater Flow and Gradient <br />ANALYTICAL DATA REVIEW: <br />Mon storing/Assessment <br />MW -1 through MW -11 D sampled quarterly <br />Quarterly <br />No <br />Natural attenuation <br />13 53 to 21 20 ft <br />Northeast @ 0 015 ft/ft <br />Based on the review of the electronic 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 limitations <br />• The reported results for total petroleum hydrocarbons as gasoline (TPHg) in sample MW -11M is due to a <br />discrete peak at C5 (probably MtBE) and has been refected <br />K �WP--ssV5 BP ARC01044934Quarterly'l3 QTR 0344493 GWMR 3Q03 dm <br />Page 1 <br />