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iul <br /> t <br /> (7 Date- �r September 19, 2000 <br /> ja <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 2130 Address 7906 EI Dorado Street, Stockton, California <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person Delta Environmental Consultants, Inc 1 Jay R Johnson <br /> Consultant Project No D000-328-1 <br /> Primary Agency/Regulatory ID No Mike Infuma, San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (Second 2000) <br /> 1 Groundwater samples were collected from monitoring wells MWA through MW-7 and MW-10 and <br /> submitted for laboratory analysis <br /> 2 Delta compiled and evaluated groundwater monitoring data <br /> 3 Delta conducted routine operation and maintenance of the air bubbling system to increase dissolved <br /> oxygen (DO) levels in the wells at the site to help promote biodegradation of hydrocarbon-impacted <br /> groundwater <br /> 4 Soil Vapor Extraction (SVE) system was not operated during second quarter 2000 <br /> WORK PROPOSED FOR NEXT QUARTER (Third 2000) <br /> 1 Delta will continue to perform routine quarterly groundwater monitoring on behalf of ARCO The next <br /> sampling event 1s tentatively scheduled for September 2000 Groundwater samples from wells MW-1 <br /> through MW-7 and MW-10 will be collected and analyzed for total petroleum hydrocarbons as <br /> gasoline (TPHG) using U S Environmental Protection Agency (USEPA) Method 8015, for benzene, <br /> toluene, ethylbenzene, and total xylenes (BTEX), and methyl tert-butyl ether (MTBE) using USEPA <br /> Method 8020, and for oxygenates tert-butyl-alcohol (TBA), MTBE, d1-isopropyl ether (DIPS), ethyl <br /> tertiary butyl ether (ETBE), and tertiary amyl methyl ether(TAME) using USEPA Method 8260 <br /> 2 Delta will continue to operate the air bubbling system to increase DO levels at the site The low flow <br /> system will operate on a continuous basis <br /> C IARC0121301QTRLY1200012130g200 doe Delta <br /> 09/19/00 <br />