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MOVE-04-99 12 :37 PM � • " <br /> r p <br /> G RI DI Associates es 08M)gL-Arand fnvlrwMantei const&ft services <br /> November 4. 1999 <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E. Weber Avenue, 31 Floor <br /> Stockton, CA 95202 <br /> Attention', Margaret Legmio <br />�f <br /> Subject: Workplan To Conduct Soil and Groundwater Investigation <br /> .Reid Plastics UST Site <br /> 75 Nest Valpico Road, Tracy,,California <br /> GA Project No. 129-05-01 <br /> Ladies and Gentlemen: <br /> Oribi Associates is pleased to present this workplan on behalf of Reid Plastics Group for the <br /> underground storage .tank (UST) site located at 75 West Valpico Road in Tracy, California (sce <br /> Figure l and Figure 2). This workplan proposes the drillingand sampling of two soil borings at the <br /> site using direct-push coring equipment. The goal of this investigation will be to characterize soil <br /> a.nd groundwater quality in the vicinity of the former fuel dispenser in order to attempt to obtain . <br /> regulatory closure for this UST site. <br /> SITE BACKGROUND <br /> f <br /> One 12,000-gallon single-walled steel diesel UST was removed. from the site by Bowen <br /> Construction-Engineering on January l S, 1999. Three soil samples(one sample taken beneath each <br /> d and one sample taken beneath the middle of the tank collected by Mr. Jiro Gribi, PIG,!at <br /> tank en p ) <br /> a deptb of about 14 feet below surface grade in native soils contained no detectable levels of Total <br /> Petroleum Hydrocarbons as Diesel (TPH-D); Benzene, Toluene, Ethylbenzene, and Xylenes <br /> BTEX or Meath l t but 1 Ether TBE Two soil samples were collected beneath the removed <br /> fuel dispenser island. One of these samples collected at about three feet in depth contained 2,300 <br /> parts per million (ppm) of TPI-[-D and no detectable BTEX or MTBE constituents. One sample <br /> collected at about five feet in depth beneath the removed dispenser contained 1,900 ppm of TPH-D• <br /> and no detectable BTEX or MTBE constituents. One soil sample collected at about four feet in <br /> depth beneath removed product delivery piping contained no TPH-D,BTEX,or MTBE constituents. <br /> Approximately 155 cubic yards of soil excavated during UST removal activities were stockpiled in <br /> four stockpiles (Stockpiles A through D on Figure l)based on obvious evidence of hydrocarbon <br /> contamination. Stockpiles B and D exhibited obvious evidence of hydrocarbons,and soil sample& <br /> collected from these stockpiles contained elevated levels of TPH-D, with no sipificant detection <br /> o'PBTEX or 1VITBE.oonstituents. With the exception of one Boil sample that contained 1,200 ppm <br /> o;f TPH-D, five soil samples collected from,Stockpiles A and C contained no significant levels of <br /> i=A=yes Stv&4 Scope G14 v&nrkk Ca4fe mO.94510 ftwe(70.1) S-7745 0 Fax(7p7)748-7763 <br />