ARCHIVED REPORTS XR0001817 - Laserfiche WebLink

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!1 rl Date March 12, 1997 . ARCO QUARTERLY GROUNDWATER MONITORING REPORT Facility No 00760 Address 225 South Cherokee Lane, Lodi, California ARCO Environmental Engineer Paul Supple Consulting Co/Contact Person EMCON/Jay R Johnson Consultant Project No 20805-142 005 Primary Agency/Regulatory ID No Linda Turkatte, San Joaquin County Public Health Services WORK PERFORMED THIS QUARTER (Fourth 1996)- 1 EMCON performed quarterly groundwater sampling 2 EMCON compiled and evaluated groundwater monitoring data WORK PROPOSED FOR NEXT QUARTER (First 1997) 1 During the meeting in May 1996, the San Joaquin County Public Health Services authorized semi- annual groundwater sampling Therefore, ARCO will continue to perform groundwater monitoring on a semi-annual basis The next sampling event is tentatively scheduled for May 1997 2 EMCON will submit a Problem Assessment Report/Site Closure Report evaluating the extent and mass of petroleum hydrocarbons and recommendations for site closure Current Phase of Project Remedial Alternatives Being Evaluated Frequency of Groundwater Sampling Semi-Annual Frequency of Groundwater Monitoring Semi-Annual Sampling Date November 25, 1996 Is Free Product (FP) Present On Site No FP Recovered this Quarter NA Cumulative FP Recovered to Date NA Approximate Depth to Groundwater 59 24 to 60 49 Groundwater Flow Direction South Groundwater Gradient 0 002 DISCUSSION Results of this monitoring event indicated that levels of dissolved gasoline hydrocarbons are consistent with levels detected during previous sampling events Groundwater gradient is consistent with previous sampling events Groundwater elevation decreased approximately 2 46 feet from the previous sampling event (May 1996) MTBE was below laboratory detection limits in groundwater samples collected from all monitoring wells • SA(_W\,PJM805\08051420 5 A 97\prz l