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AW" <br /> AM <br /> April 7, 1992 �AW�A <br /> ARCO Service Station No. 760, Lodi, California <br /> 1 <br /> personnel, the higher detection limit was a result of matrix interference TPHg and BTEX <br /> concentrations were below 1.0 ppm and 0 005 ppm in the other native soil samples collected <br /> P under the former product lines Totai lead was detected in soil sample S-3-PL7 at 15 1-ppm; r <br /> however,-the soluble concentration- was 0 97 ppm, which-is below the STLC outlined in Title <br /> 22, California Code of Regulations, Section 66699 <br /> 1 Residual hydrocarbons were not detected in the soil sample collected from under former <br /> tank T9 (Table 9), except for 120 ppm of TOG Analytical results indicated total <br /> concentrations of chromium and zinc were below TTLC, total cadmium and chromium VI <br /> 1 were not detected Total lead was detected at a concentration of 5 9 ppm <br /> Installation of Conductor Casings-in New Tank Cavity <br /> 1• <br /> Before the installation of the new tanks, the contractor installed six 12-inch-diameter <br /> conductor casings between the new tanks Conductor casings were installed to allow soil <br /> borings to be drilled between the new tanks if warranted in a future investigation The <br /> 1 location of the conductor casings are shown on Plate 3 <br /> Installation of Gasoline Tanks and Product Lines <br /> 1 <br /> On June 25, 1991,RESNA forwarded laboratory results of soil samples collected from under <br /> former tanks T1 through T3, from below the new tanks T4 through T7 and tank T8 to the <br /> SJCPHS-EHD (RESNA Industries, June 25, 1991) asking for authorization to install four <br /> 1 new 10,000-gallon tanks in the newly excavated tank cavity RESNA received verbal <br /> authorization to install the tanks from the SJCPHS-EHD on June 26, 1991 The tanks were <br /> installed by Golden West on June 28, 1991 <br /> 1 . <br /> 38048-5 12 <br /> r <br />