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I <br /> �� EMCOR <br /> IU 1433 North Market Boulevard + Sacramento California 95834-1943 + (916)928-3300 • Fax(916)928-3341 <br /> D� <br /> I ga December 16, 1994 <br /> DEQ 2 19 Project 0805-146 01 <br /> I �N P�MMf s R <br /> Mr Kyle Christie <br /> ARCO Products Company <br /> I P O Box 5811 <br /> San Mateo, California 94402 <br /> IRe Thud Quarter 1994 Status Report for ARCO Service Station No 2169, 441 Charter Way, <br /> Stockton, California <br /> IDear Mr Christie <br /> I At the request of ARCO Products Company (ARCO), EMCON Associates (EMCON) is conducting <br /> an environmental investigation at the subject site (see Figure 1) We have prepared this status report <br /> based on the work conducted during the third quarter 1994, which included groundwater monitoring <br /> and sampling <br /> I BACKGROUND <br /> RESNA Industries (RESNA) of Rancho Cordova, California observed drilling of four soil borings (B-1 <br /> I through B-4) at the site in July 1991 during a preliminary tank replacement assessment investigation <br /> Residual gasoline hydrocarbons were detected in soil samples collected from the borings The site was <br /> added to the San Joaquin County Public, Health Servu.es, Environmental Health Division pilot program <br /> on August 5 1991 <br /> In April and May 1992, 11 SNA observed drilling of eight additional soil borings (B-5 throughB. 12) <br /> and installation of three✓✓groundwater monitoring wells (MW-1 through MW-3) and three vapor <br /> extraction wells (VW-1 through VW-3) Well locations are shown on Figure 2 Gasoline hydrocarbons <br />' were detected in samples collected from the borings Total oil and grease (TOG), halogenated volatile <br /> organic compounds, and polychlonnated biphenyls were not detected in the samples analyzed, <br /> however, total extractable hydrocarbons were detected During drilling on April 28, 1992, <br />' approximately 5 gallons of gasoline were released from a fractured product line between the dispenser <br /> islands and the underground tank cavity Results of the initial assessment of the release were reported <br /> in RESNA's second quarter 1992 status report and addendum workplan (RESNA, August 11, 1992, <br />' Report 31009-6) <br /> . Dissolved gasoline hydrocarbons were detected in water samples collected from the three wells. <br /> Purgeable halocarbons were not detected, except for 1,2-dichloroethane which was detected in <br /> (�2 i-DC14 �Z <br /> SAC/PJM805\08051460 IAS-94 PAS 2 <br /> I <br />