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Date May 9,2003 <br /> Quarter ? Quarter,2003 <br /> • ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 0434 <br /> Address 501 W Kettleman Lane, Lodi, CA <br /> ARCO Environmental Engineer Paul Supple - <br /> Consulting Co/Contact Person URSNernon Elarth <br /> Consultant Project No 38466099 00636 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health Services <br /> SJCEHS <br /> Assembly Bill 681 Status Property owned by Mr Mark A Garibaldi and Ms Deanne L <br /> Garibaldi <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 W-1 A, W-2,W-2A, W-213,W-3,W-9 sampled quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Is Free Product(FP) Present on Site No <br /> FP Recovered this Quarter NA <br /> Cumulative FP Recovered to Date NA <br /> Current Remediation Techniques Natural attenuation <br /> Approximate Depth to Groundwater 56 52 to 58 43 feet below ground surface <br /> Groundwater Gradient SW-NE @ 0 0009 to 0 006 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 /> LCSILCSD 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) and benzene were reported in samples collected from site wells <br /> this quarter All other analytes were reported as below laboratory detection limits Analyte concentrations were <br /> generally consistent with historic data Groundwater elevations across the site increased relative to the previous <br /> reporting period The inferred groundwater flow direction across the site ranged from southwest to northeast at an <br /> average gradient of 0 0009 to 0 006 ft/ft Wells W-2 and W-2A, clustered in the southeast portion of the site have <br /> . overlapping screen intervals but exhibit significantly different water levels The water level obtained from well W- <br /> 2A was not used in contouring on Figure 1 because it appears to be anomalous when compared with water levels <br /> K V5 BP ARCD5004341Qumerrlyli QTR 031434 GWMR IQ03 do Page 1 <br />