SITE INFORMATION AND CORRESPONDENCE

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Chevron Chevron March 12, 1997 Chevron Pipe line Company 4000 Executive Parkway,Suite 400 San Ramon,CA 94583 P.O.Box 5059 San Ramon,CA 94583-0959 Michael J. Infurna Jr. San Joaquin County Public Health Services Environmental Health Division P.O. Box 388 Stockton, California 95201-0388 Hanson Property San Joaquin County APN No. 252-040-02 7750 West Shulte Road Tracy, California 95376 Dear Michael: In response to your comments on the December 11, 1996 Geomatrix Consultants, Inc. report titled Soil Assessment Results Hanson Property, 7750 West Shulte Road, Tracy California, Chevron Pipe Line Company (CPL) proposes additional soil and groundwater sampling at the subject site. The additional soil and groundwater sampling will be conducted to confirm that the subsurface "pipe wrap" material has not adversely impacted soil beneath the site and is not providing a source of petroleum hydrocarbon constituents to groundwater. CPL proposes advancing one boring in the location of boring SB-1 (Figure 1). A soil sample will be obtained at the depth which exhibits the greatest evidence of petroleum impacted soil, as determined through field observations. If there is no evidence of petroleum impacted soil the sample will be obtained at a depth of 5 feet below ground surface. A groundwater sample will be collected from temporary well casing. The soil sample will be analyzed for benzene, toluene, ethylbenzene and total xylenes (BTEX) using Method 8020, polyaromatic hydrocarbons (PAHs) using method 8310 and total extractable petroleum hydrocarbons (TEPH) using Method 3550/3620/8015M quantified against crude oil. The groundwater sample will be analyzed for BTEX using Method 8020, PAI-Is using method 8310, total purgable petroleum hydrocarbons (TPPH) using Method 5030/8015M quantified against gasoline and TEPH using Method 3550/3620/8015M quantified against diesel.