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03.12/97 WED 13:53 FAX 510 812 6915 CPL HELP H.O. 002 <br /> [neon <br /> Chevron <br /> March 12, 1997 CAarran Pipe lino Compaay <br /> 4000 Executive Parkway.Suite 400 <br /> San Ramon,CA 94583 <br /> P.O.Box 5059 <br /> San Ramon,CA 94583.0959 <br /> Michael J. Infurna Jr. <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 388 <br /> Stockton, California 95201-0388 <br /> Hanson Property <br /> San Joaquin County APN No.252-040-02 <br /> 7750 West Shulte Road <br /> Tracy, California 95376 <br /> Dear Michael: <br /> In response to your comments on the December 11, 1996 Geomatrix Consultants, Inc.report <br /> titled Soil Assessment Results Hanson Property, 7750 West Shulte Road, Tracy California, <br /> Chevron Pipe Line Company (CPL)proposes addition soil and groundwater sampling at the <br /> subject site. The additional soil and groundwater sampling will be conducted to confirm that the <br /> subsurface "pipe wrap"material has not adversely impacted soil beneath the site and is not <br /> providing a source of petroleum hydrocarbon constituents to groundwater. <br /> CPI,proposes advancing one boring in the location of boring SB-1 (Figure 1). A soil sample <br /> will be obtained at the depth which exhibits the greatest evidence of petroleum impacted soil, as <br /> determined through field observations. If there is no evidence of petroleum impacted soil the <br /> sample will be obtained at a depth of 5 feet below ground surface. A groundwater sample will be <br /> collected from temporary well casing. <br /> The soil sample will be analyzed for benzene, toluene,ethylbenzene and total xylenes (BTEX) <br /> using Method 8020,polyaromatic hydrocarbons (PAHs) using method 8310 and total extractable <br /> petroleum hydrocarbons (TEPH) using Method 3550/3620/8015M quantified against crude oil. <br /> The groundwater sample will be analyzed for BTEX using Method 8020,PAHs using method <br /> 8310, total purgable petroleum hydrocarbons (TPPH) using Method 5030/8015M quantified <br /> against gasoline and TEPH using Method 3550/3620/8015M quantified against diesel. <br />