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r <br /> Shaw Environmental, Inc. <br /> 4005 Port Chicago Highway <br /> Concord, CA 94520 <br /> Phone: 925288.9898 <br /> Fax: 925.288.0888 <br /> tShaw® Shaw Environmental, Inc. <br /> April 13, 2004 <br /> Shaw Job Number 102067.21 <br /> �I 1 <br /> MC�� <br /> Mr. Mike Infurna <br /> San Joaquin County Environmental Health Department APR 1 6 2004 <br /> 304 East Weber Avenue -1 HEALTH <br /> ENVIRONMENT NMEPJ <br /> Stockton, California 95202 PERMIT/SERVICES <br /> SUBJECT: Letter Work Plan for Proposed Well Destruction Activities <br /> SBC (former Pacific Bell) Facility <br /> 10 East 12th Street <br /> Tracy, California <br /> Dear Mr. Infurna: <br /> Shaw Environmental, Inc. (Shaw) was retained by SBC to generate a work plan for the <br /> destruction of three groundwater monitoring wells at the above-referenced site (Figure 1). This <br /> work planhas been prepared in response to a written request from the San Joaquin County <br /> Environmental Health Department (SJCEHD) as part of the Case Closure Requirements <br /> (Attachment 1). <br /> SITE BACKGROUND <br /> In February 2002, a 500-gallon heating oil UST was encountered on the southeastern portion of <br /> the site during grading. The age of this UST is unknown; however, it is believed the UST was <br /> used to supply fuel for the heating system of a former residential structure on the site; hence tank <br /> installation likely occurred one-half century or more ago. This UST was removed in early 2002. <br /> No petroleum hydrocarbon analytes were detected in a soil sample collected from the base of the <br /> UST excavation. Approximately 31 cubic yards of fill material generated during removal <br /> activities were transported off-site for disposal. <br /> h � <br /> In March 2002, a 2,000-gallon diesel UST was removed from the site. The UST was located <br /> about 120 feet from the former heating oil UST and had contained fuel for an emergency backup <br /> power generator. During removal activities, groundwater was encountered at a depth of <br /> approximately 12 feet below surface grade (bsg). Soil samples collected from the excavation and <br /> pipeline trench contained 1.3 and 5.0 parts per million(ppm) of total petroleum hydrocarbons as <br /> L� diesel (TPH-D), respectively. A groundwater sample collected from the excavation contained <br /> 130 parts per billion (ppb) of TPH-D. Stockpiled soils were used to backfill the UST excavation <br /> following removal activities. <br /> 1 <br /> lJ <br /> 0:SHARDUSW4-01 s8.aoc A Shaw Group Company <br /> 1 <br />