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SDate August 9, 2004 i ARCO QUARTERLY GROUNDWATER MONITORING REPORT Facility No 6100 Address 25775 Patterson Pass Road, Tracy, CA _ ARCO Environmental Engineer Paul Supple Consulting Co/Contact Person Stratus Environmental, Inc 1 Jay R Johnson, R G Consultant Project No U6100-14-4 Primary Agency/Regulatory ID No Nuel Henderson / San Joaquin County Environmental Health Department/ 1708 BRIEF HISTORY Four gasoline UST's, one waste oil UST, and associated product piping were replaced in 1987 Between 1991 and 1995 a total of 31 soil borings were drilled to depths between 26 and 115 feet below ground surface (bgs) Twenty vapor extraction wells (VW-1 through VW-20) were installed in selected borings Pinnacle Environmental Solutions, Inc submitted a request for "No Further Action" to the RWQCB on February 1, 2000 The RWQCB denied the request, and requested a groundwater investigation One soil boring (B-32) was drilled at the site to a depth of approximately 200 feet bgs in August 2000 Groundwater monitoring well MW-1 was installed in this boring to a depth of approximately 115 feet bgs Following construction of the well, free product was observed in the well Floating product has been . removed manually from the well on a weekly basis since September 2000 f During August and September 2001, Delta advanced six onsite mud rotary soil borings (B-33 through B-38) to depths up to 140 feet bgs In each boring, soil samples were collected continuously and an open hole geophysical log completed An air rotary casing hammer rig was used to install a well (B-2 through B-9) adjacent to each of the soil borings The dispensers and product piping were replaced during the first quarter 2002 Delta collected compliance soil samples between January 18 and February 11, 2002 Lateral conveyance piping was installed to selected vapor and monitoring wells for future use in soil vapor extraction Piping was stubbed up in the northwest corner of the property which is the proposed future location of the treatment system compound Upon approval of RAP, Stratus installed two SVE systems to facilitate soil vapor extraction from wells VW-1, VW-3, VW-4, VW-6, VW-7, VW-8, VW-11, VW-12, VW-13, VW-14, VW-16, and MW-2 through MW-9 The SVE system was started for continuous operation beginning March 15, 2004 in accordance with San Joaquin Valley Air Pollution Control District's (SJVAPCD) authority to construct (N-5026-1-0 & N-5026-2-0) WORK PERFORMED THIS QUARTER(Second 2004) 1 A Stratus technician conducted eleven site visits during the second quarter 2004 to conduct operation and maintenance of the two SVE systems, to remove floating producting from well MW-1, if present, and to collect compliance discharge samples 2 Stratus monitored all vapor extraction and monitoring wells for the presence of water and free product on June 21, 2004 Groundwater samples were collected on June 22, 2004 from wells MW-1, MW-2, MW-10, MW-12, MW-13, MW-15, VW-1, VW-2, VW-3, VW-4, and the domestic P\BP-Arco for URS\6100\Quarterly\2004\Arco_6100_2Q04 doc 57RA7115