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���' .. V S rev. •v n. _ r �.. +N"•:mss�2� £ I _ _ Ewa�i�ca.x�aa _ rT.rsYs F L� i`i _ <br /> r <br /> 'r <br /> TANK Quin REPORT <br /> 7700 MorW&nd Court,Stockton,Callfornla <br /> Delta Project No.40.88-140 <br /> Page 4 <br /> 5.0_(EAUTUISHUM <br /> 4t ArL-Descrintlojl of Remoml Process <br /> L. Triangle Construction Inc., and its subcontractors exposed and removed the three underground <br /> storage tanks on December 27, 1989. The tanks were exposed,and purged with dry ice in order to <br /> facilitate safe removal and transport, Charles Hunt of San Joaquin County, Environmental Health <br /> Department, issued a permit and marked each tank with the number 39-1819. The tanks were <br /> transported to Triangle Construction Inc., in Sacramento.California,for their final designation. <br /> F 5.Z Sell Cendltloaa <br /> A Delta representative was present during the excavation of the underground storage tanks to ensure <br /> all soils being excavated were contained on site for proper disposal. Samples of the backfill material <br /> covering the tanks were collected and screened with a portable photoionixation detector. The <br /> backfill was not noticeably discolored around the fill ports of the tanks. <br /> ' <br /> 5.3 Fortner Tank Exggradoa Sampling t <br /> A total of seven soil samples were taken from the bottom of the former na.nk excavation at tha <br /> request of San Joaquin County,Environmental Health Department. The soil samples were analyzed <br /> for BTX,TPH,EDB.and organic lead. A summary of the chemical analyses is presented in Table 2. <br /> { Soil sample identification and locations are shown in Figure 2. and laboratory data sheets are <br /> - XF <br /> presented in Appendix A. Concentrations of TPH were nondetectable in all samples, except TS-2, <br /> which had a TPH value of 1,030 ppm. Concentrations of BTEX in soil sample TS-2 were<0.025, <br /> 6.37, 21.4, and 4.76 ppm, respectively. <br /> Approximately 400 cubic yards of designated cIeaa soil excavated from the area of the new tank <br /> r location was used to backfill the formers <br /> t <br /> tank excavation. Before placement of the backfill,the tank , <br /> e excavation was lined with gravel is order to delineate the placed backfill from the natural soils. <br /> 5.4_ Product Llne Excalation and Sampling <br /> t? Two product tines supplied the east and west fuel islands and were located on the inside of each fuel 1 <br /> y 's island. On January 3, 1989, the product lines-were excavated, and six soil samples were obtained <br /> from the product line trench for chemical analysis. Chemical analysis-of these soii._samplas_.are <br /> presented in Table 3. Soil sample identification and Iocations are shown in Figure 2 and laboratory <br /> . data sheets aro presented in Appendix B. <br /> s ��b <br /> f <br /> r <br />