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Conoco, Inc., East Washington Street, Stockton, California SECOR Project No. <br /> II. SITE CHARACTERISTICS <br /> A. Facility Description (Identify structures, buildings, pits, impoundments, and work <br /> area ) The work acmducted by SECOR occurs at and in tbt- immediate-, Yicinity of <br /> B. Site Status: <br /> Occupied (YES/NO). _M If YES, describe current activities The Site indudes <br /> -buddings with arliace t parking ' ts. The Site bag foot and <br /> vehicle traffic. I I <br /> C. Unusual Site Features (water supply, telephone, radio, powerlines, traffic patterns, <br /> gas lines, water mains, terrain, vacant lots, debris, other physical hazards, etcThe Siti- utilities enter the property via above-, <br /> ). <br /> D. Site Map (See Attachment 6) <br /> E. Contaminant Description: <br /> iThe following is a list of chemicals detected during annual groundwater monitoring The <br /> chemicals presented on the list below have steadily decreased in concentration since system <br /> start-up <br /> Source of Source of Sample Environmental <br /> Substance Contamtnatton Sample Concentration Regulatory <br /> (May 1995 Action Level <br /> LWbenzene <br /> st Storage and Dispensing Operations Groundwater < 50 b 50 <br /> st Stora a and Dis nstn O rations ppb <br /> GroundwaEer <0 5 b 1 b <br /> st Stora a and Dts ensm O rations Groundwater <0 5 b 40 b <br /> t Stora a and Dis ensin O rations Groundwater <0 5 b 20 b <br /> t Storage and Dispensing Operations I rGroundwater <1 5 ppb 30 ppb <br /> On a quarterly basis, SECOR collects air samples at the influent and effluent of the <br /> treatment system (summarized in Attachment 11) No analytes exceeded the PELs or TLVs <br /> published for the individual components. Based on this information and no potential for <br /> new sources in the immediate vicinity, SECOR will not conduct air monitoring during <br /> system O&M or groundwater monitoring <br /> f lconocolatockto.%&sWockton o&m 12/18/95 4- <br />