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Date March 16, 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 20805-146 011 <br /> Primary Agency/Regulatory ID No Ron Rowe, San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (Fourth 1998) <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 (First 1999) <br /> 1 Pinnacle will continue to perform quarterly groundwater monitoring for ARCO The next sampling <br /> event is tentatively scheduled for February 1999 Groundwater samples will be collected and analyzed <br /> for 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 tert- <br /> butyl ether (MTBE) using USEPA Method 8020, and for oxygenates using USEPA Method 8260 <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling MW-1 through MW-7= Quarterly <br /> Frequency of Groundwater Monitoring Quarters <br /> Sample Date November 9, 1998 <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 19 68 to 23 42 <br /> Direction of Groundwater Flow East-southeast <br /> Groundwater Gradient 0 003 <br /> CF1 E 1ARC0121681QTRLY12168Q498 DOC-98\1sg 11 �� <br />