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a� <br /> Chevron <br /> June 9, 1998 Chevron Pipe Line Company <br /> 4000 Executive Parkway,Suite 400 <br /> San Ramon;CA 94583 <br /> P.O.Box 6059 <br /> San Ramon,CA 94583-0759 <br /> Mr. Michael J. Infurna, Jr. <br /> San Joaquin County Public Health Services <br /> Environmental Health Division PAYMENT <br /> P.O. Box 388 RECEIVED <br /> Stockton, CA 95201-0388 JUN 2 2 1 <br /> 998 <br /> Surland Homes Property SAN JOAQUIN COUNTY <br /> PUBLIC HEALTH San Joaquin County APN No.238-020-11 ENVIRONMENTAL HEALTH SERVIUIV DIVISION <br /> Tracy, California <br /> Dear Michael: <br /> Chevron Pipe Line Company (CPL) proposes to advance three borings in the locations 1 <br /> shown on the attached figure to determine if CPL'S historical pipeline operations in the <br /> area have adversely impacted site soil and groundwater in the subsurface. Soil samples <br /> will be obtained at the depth which exhibits the greatest evidence of petroleum impacted I 0 <br /> soil, as determined through field observations. In addition, a grab groundwater sample <br /> will be collected from a temporary well casing in each boring location. If there is no <br /> evidence of petroleum impacted soil at the site, soil samples will be obtained at a depth of <br /> 5 feet below ground surface, and no grab groundwater samples will be collected. <br /> As per CPL'S Technical Approach to Site Evaluation and Decision-Making, Old Valley <br /> Pipeline Sites - Central Valley (March 20, 1997; "Consistent Approach"), the soil and <br /> groundwater samples will be analyzed for the following constituents as described below: <br /> • The soil samples will be analyzed for benzene, toluene, ethylbenzene, and total <br /> xylenes (BTEX) using U.S. Environmental Protection Agency (EPA) Method 8020, <br /> polyaromatic hydrocarbons (PAHs) using EPA Method 8270 SIM, and total <br /> extractable petroleum hydrocarbons (TEPH) using EPA Method 8015M quantified <br /> against crude oil. <br /> • The groundwater samples will be analyzed for BTEX using EPA Method 8020, PAHs <br /> using Method 8270 SIM, total purgable petroleum hydrocarbons (TPPH) using EPA <br /> Method 8015M quantified against gasoline, and TEPH using EPA Method 8015M <br /> quantified against diesel. <br />