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CLEARWATER <br /> G R O U P, I N C. <br /> In addition to the above analytes, two soil samples will be analyzed for TPH as <br /> diesel fuel (TPHd; EPA Method 8015 Modified) to confirm the presence or <br /> absence of diesel fuel compounds in the native soil. The two samples will be <br /> selected on the basis of field observations (diesel odor or visual evidence of <br /> diesel contamination). If none of the samples appear to be contaminated with <br /> diesel fuel, the two soil samples with the highest concentration of TPHg shall <br /> also be analyzed for TPHd. <br /> Groundwater samples will be analyzed for TPHg, TPHd, and BTEX. <br /> Analytical detection limits for the analytes listed above will be equal to or <br /> lower than the following: <br /> • TPHg: 50 parts per billion (ppb) in water and 1 ppm in soil <br /> • BTEX: 0.5 ppb in water and 0.005 ppm in soil <br /> • TPHd: 50 ppb in water and 1 ppm in soil. <br /> 2.4 Sampling and Analysis of Stockpiled Soil <br /> Ms. Margaret Lagorio of the San Joaquin County PHS estimates that no more <br /> than 100 cy of stockpiled soil remains at 1111 North Union Street. In a letter <br /> dated January 25, 1996, Ms. Lagorio indicated that one discrete soil sample <br /> should be collected from the middle of the soil stockpile. <br /> The stockpile sample should be collected in a stainless steel sampling tube, <br /> and sealed and transported in the manner described in Section 2.2 of this <br /> workplan. The sample will be analyzed for the following compounds, in <br /> accordance with PHS directives stated in a January 12, 1995 letter: <br /> • TPHg (EPA Method 8015) <br /> • BTEX (EPA Method 8020) <br /> • TPHd (EPA Method 8015 Modified) <br /> • Chlorinated solvents (EPA Method 8010) <br /> • Metals (cadmium, chromium, zinc, lead; and nickel by EPA Methods <br /> 6010/7421). <br /> D108 WP(revised)1/96 7 <br />