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V <br /> Date: April 22, 2003 <br /> Quarter 15' Quarter, 2003 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 6080 <br /> Address 85 Louise Avenue, Lathrop, CA <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person URSNernon Elarth <br /> Consultant Project No 38466093 00436 <br /> Primary Agency/Regulatory ID No San Joaquin County <br /> WORK PERFORMED THIS QUARTER (First 2003): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report. <br /> WORK PROPOSED FOR NEXT QUARTER (Second 2003): <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> QUARTERLY RESULTS SUMMARY (First 2003): <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling MW-1 through MW-3 sampled quarterly <br /> Frequency of Groundwater Monitoring Quarterly _ <br /> Is Free Product(FP) Present Onsite No <br /> Current Remediation Techniques Natural attenuation <br /> Approximate Depth to Groundwater 9 15 to 9 92 feet below ground surface <br /> Groundwater Flaw and Gradient Northeast cQ 0 001 feet/foot ... <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 <br /> laboratory <br /> DISCUSSION: <br /> Total petroleum hydrocarbons as gasoline (TPHg), methyl tert-butyl ether (MtBE), and 1,2-dichloroethane (1,2- <br /> DCA) were reported in groundwater samples collected from site wells this quarter Analyte concentrations were <br /> generally consistent with historic data All other analytes were reported as below laboratory detection hrmts <br /> Groundwater elevations in site wells increased relative to the previous quarter The inferred direction of <br /> groundwater flow was to the northeast with an average gradient of 0 001 ft/ft, which is consistent with historic data <br /> This report is based on data, site conditions, and other information that are generally applicable as of the date of the <br /> report,and the conclusions and recommendations herein are therefore applicable only to that time frame <br /> K U5 BP ARC0%0WW\Quaacr1y51 QTR 03%6080 GWMRIQ03 doc Page 1 <br />