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U 1'4 vi f <br /> Ehnivr4E.NMENIAL EALTH <br /> 304 Weber Ave.Third FlooDIVISIONr <br /> P.O. Box 383,stockton,CA 95201-0388 <br /> Phone: (209)468-3420 <br /> ved <br /> �Plilpprove(,.1 v;!it1-1 rtianges. See Remarks <br /> ,��wvo <br /> FJ LN;SapV"'1,^)ved: See Renlafts <br /> plans extf_v cn1yt0thfkt <br /> anr'4 des"'. <br /> -Ze <br /> GRIBI Associates Geological an WEnironmen1tal Consultkig S4iuic!s';l ithori Or 'V'-T, sY <br /> a -.0n of requirennow.'s 01 taW iWei;� ur <br /> 0,�Zli na rice S. <br /> November 4, 1999 <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E.Weber Avenue,3rd Floor <br /> Stockton,CA 95202 <br /> Attention: Margaret Legorio <br /> Subject: Workplan To Conduct Soil and Groundwater investigation <br /> Reid Plastics UST Site <br /> 73 West Valpico Road,Tracy,California <br /> GA Project No. 129-05-01 <br /> Ladies and Gentlemen: <br /> Gribi 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(see <br /> Figure I and Figure 2). This workplan proposes the drilling and 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 /> and 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 /> One 12,000-gallon single-walled steel diesel UST was removed from the site by Bowen <br /> Construction-Engineering on January 18,1999. Three soil samples(one sample taken beneath each <br /> tank end and one sample taken beneath the middle of the tank)collected by Mr.Jim Gribi,RG,at <br /> a depth 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 Methyl-t-butyl Ether(MTBE). 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 TPH-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 1)based on obvious evidence of hydrocarbon <br /> contamination. Stockpiles B and D exhibited obvious evidence of hydrocarbons,and soil samples <br /> collected from these stockpiles contained elevated levels of TPH-D,with no significant detection <br /> of BTEX or MTBE constituents. With the exception of one soil sample that contained 1,200 ppm <br /> of TPH-D,five soil samples collected from Stockpiles A and C contained no significant levels of <br /> 1350 Hayes Street,Suite C-14 *Benicia VUlfornia 094510 OPhone(707)748-7743 dPFax(707)748-7763 <br />