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til {r <br /> t� Date June 17, 1999 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 02168 Address 441 Charter Way, Stockton, California <br /> ARCO Environmental Engineer Kyle Christie <br /> Consulting Co/Contact Person Pinnacle/Jay Johnson <br /> Consultant Project No 20805-146 013 <br /> Primary Agency/Regulatory ID No Ron Rowe, San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (First 1999) <br /> 1 Groundwater samples were collected from monitoring wells MW-1 through MW-7 and submitted for <br /> laboratory analysis <br /> WORK PROPOSED FOR NEXT QUARTER (Second 1999) <br /> 1 Pinnacle will continue to perform quarterly groundwater monitoring for ARCO The next sampling <br /> event is tentatively scheduled for May 1999 Groundwater samples will be collected and analyzed for <br /> total petroleum hydrocarbons as gasoline (TPHG) using U S Environmental Protection Agency <br /> (USEPA) Method 8015, for benzene, toluene, ethylbenzene, and total xylenes (BTEX), and methyl <br /> tert-butyl ether (MTBE) using USEPA Method 8020, and for oxygenates using USEPA Method 8260 <br /> Current Phase of Project Monitonng <br /> Frequency of Groundwater Sampling MW-1 through MW-7= Duartedi <br /> Frequency of Groundwater Monitoring Quarterly <br /> Sample Date February 17, 1999 <br /> Is Free Product (FP) Present on Site No <br /> FP Recovered This Quarter NA <br /> Cumulative FP Recovered to Date NA <br /> Approximate Depth to Groundwater 18 79 to 22 65 <br /> Direction of Groundwater Flow Southeast <br /> Groundwater Gradient 0 002 <br /> CP lE 1ARCO\21681QTRL,Y12168Q 199 DOC-9811sg 1 <br />