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Date September 18, 2000_ <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 Delta Environmental Consultants, Inc /Jay R Johnson <br /> Consultant Project No D000-329-1 <br /> Primary Agency/Regulatory ID No Ron Rowe, San Joaquin County Public Health Seances <br /> WORK PERFORMED THIS QUARTER(Second 2000) <br /> 1 Performed quarterly groundwater monitoring and sampling for second quarter 2000 Groundwater <br /> samples were collected from monitoring wells MW-1 through MW-7 and submitted for laboratory <br /> analysis <br /> WORK PROPOSED FOR NEXT QUARTER (Third 2000) <br /> 1 The next sampling event is tentatively scheduled for September 2000 Groundwater samples will be <br /> collected and analyzed for total petroleum hydrocarbons as gasoline (TPHG) using U S <br /> Environmental Protection Agency (USEPA) Method 8015, for benzene, toluene, ethylbenzene, and <br /> total xylenes (BTEX) using USEPA Method 8020, and for 5 oxygenates (MTBE, ETBE, DIPS, TAME <br /> and TBA) and 1,2, DCA using USEPA Method 8260 <br /> 2 Delta will direct the drilling and installation of 2 on-site monitoring well clusters to provide vertical <br /> assessment of petroleum hydrocarbons in sod and groundwater Wells will be developed and <br /> sampled following the soil and groundwater investigation The new monitoring wells will be included in <br /> the third quarter groundwater monitoring event <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling MW-1 through MW-7= Quarterly <br /> Frequency of Groundwater Monitoring _ Quarterly <br /> Sample Date June 22, 2000 <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 17 99 to 21 97 ft <br /> Direction of Groundwater Flow East <br /> Groundwater Gradient 0 0047 ft/ft <br /> •I <br /> C\aRCO\2169�QTRLY\2000�2168Qz00 DOC Delta <br /> 09/18/00 <br />