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1 <br /> Shaw Environmental, InC <br />' 4005 Port Chicago Highway <br /> Concord, CA 94520 <br /> Phone 925 288 9898 <br /> Fax 925 288 0888 <br /> Shaw" Shaw Environmental, Inc m E C IJ IE 0 <br /> I JUN 0 8 2004 <br /> ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br />' May 28, 2004 <br /> Shaw Job Number 102067 21 <br />' Mr Mike Infurna. <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue <br /> Stockton, California 95202 <br /> SUBJECT: Letter Report for 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 destroy three groundwater monitoring <br /> wells at the above-referenced site (Figure 1) Well abandonment activities were conducted on <br /> April 26, 2004 at the request of the San Joaquin County Environmental Health Department <br /> (SJCEHD) prior to issuing case closure for the site <br /> SITE BACKGROUND <br /> In March 2002 a 2,000-gallon diesel UST was removed from the site Soil samples collected <br /> from the tank excavation and pipeline trench contained 1 3 and 5 0 parts per million(ppm) of <br />' total petroleum hydrocarbons as diesel (TPH-D), respectively A groundwater sample collected <br /> from the excavation contained 130 parts per billion (ppb) of TPH-D <br />' In September 2002, six direct-push soil borings were made adjacent to the former UST <br /> excavation and fuel piping system, and in the direction of groundwater flow Analysis of the soil <br /> samples detected TPH-D in one boring at a concentration of 2 7 ppm No benzene, toluene, <br />' ethylbenzene, and xylenes (BTEX) constituents or methyl tertiary butyl ether (MTBE) were <br /> detected in any of the soil samples TPH-D was detected in groundwater samples at <br /> concentrations ranging from 50 ppb to 390 ppb in three of the borings No BTEX constituents or <br />' MTBE were detected in the samples <br /> • In July 2003, Shaw installed three monitoring wells at the site No petroleum hydrocarbon <br />' analytes were detected in any of the soil samples collected from the wellbores No analytes were <br /> detected in groundwater samples from the wells during two consecutive quarters No field <br />' 0 SHAREWSP04-0165 doc A Shaw Group Company <br />