ARCHIVED REPORTS XR0009983 - Laserfiche WebLink

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. Date January 30, 2001 ARCO QUARTERLY GROUNDWATER MONITORING REPORT Facility No 2130 Address 7906 EI Dorado Street, Stockton, California ARCO Environmental Engineer Paul Supple Consulting Co/Contact Person Delta Environmental Consultants, Inc I Jay R Johnson Consultant Project No D000-328-1 Primary Agency/Regulatory ID No Mike Infurna, San Joaquin County Public Health Services WORK PERFORMED THIS QUARTER (Fourth 2000) 1 Groundwater samples were collected from monitoring wells MW-1 through MW-7 and MW-10 and submitted for laboratory analysis 2 Delta compiled and evaluated groundwater monitoring data WORK PROPOSED FOR NEXT QUARTER (First 2001) 1 Delta will continue to perform routine quarterly groundwater monitoring on behalf of ARCO The next sampling event is tentatively scheduled for March 2001 2 Groundwater samples from wells MW-1 through MW-7 and MW-10 will be collected and analyzed for total petroleum hydrocarbons as gasoline (TPHG) using U S Environmental Protection Agency (USEPA) Method 8015, for benzene, toluene, ethylbenzene, and total xylenes (BTEX), and methyl tertiary-butyl ether (MTBE) using USEPA Method 8020, and for oxygenates tertiary-butyl-alcohol (TBA), MTBE, di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETRE), and tertiary amyl methyl ether (TAME) using USEPA Method 8260 3 Initiate air bubbling of ambient air at low flow rates into select wells Current Phase of Project Monitoring/Remediation Frequency of Groundwater Sampling All Monitoring Wells=Quarterly Frequency of Groundwater Monitoring ^Quarterly Sampling Date December 19,2000 Is Free Product (FP) Present on Site No FP Recovered This Quarter NIA Cumulative FP Recovered to Date NIA Current Remediation Techniques SVEIAir Bubbling (SVE system down since 11124197) _ - - - Approximate Depth to Groundwater 36 63 to 38 72 ft bgs Groundwater Flow Direction Southeast Groundwater Gradient 0 0012 ft/ft 400 Delta 1ARC0121301 TRLY1200012130 C Q Q 1130101