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i <br /> Chpy "`!a <br /> Ch <br /> evron <br /> t rF dT SI,yI�� <br /> September 14, 1998 Chevron Pipe Line Company <br /> 4000 Executive Parkway,Suite 400 <br /> San Ramon,CA 94583 <br /> P.O:Box 6059 <br /> Mr. Michael J. Infurna, Jr. San Ramon,CA 94583-0759 <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P. O. Box 388 t <br /> Stockton, CA 95201-0388 I� <br /> 44 <br /> Work Plan for Field Investigation 4 <br /> Mansfield Property <br /> 13880 W. Grant Line Road, Tracy,CA 95376 I <br /> Dear Michael: <br /> I <br /> Enclosed please find a completed Master File Record Information form (i.e.,,Green Form andpi '-a"'. <br /> check for$234.00 for the purpose of opening a San Joaquin County Public Health Services— <br /> Environmental <br /> ervices—Environmental Health Division(PHS-EHD) account for the subject property. The'purpose for <br /> opening an account with PHS-EHD is that Chevron Pipe Line Company (CPL) proposes to <br /> advance one soil boring, B-1, in the approximate location shown on the attached Figure 1 to <br /> ascertain if CPL's historical pipeline operations in the area have adversely impacted site soil and <br /> groundwater in the subsurface at the location of the proposed boring. <br /> i <br /> If no evidence of petroleum impacted soil is observed in the soil core collected from the boring, <br /> one soil sample will be collected at a depth of approximately 5 feet below ground surface, and no <br /> grab groundwater sample will be collected. The soil sample will be analyzed for benzene, <br /> toluene, ethylbenzene, and total xylenes (BTEX)using U.S. Environmental Protection Agency <br /> (EPA) Method 8020, polyaromatic hydrocarbons (PAHs)using EPA Method 8270 SIM, and <br /> total petroleum hydrocarbons (TPH)using EPA Method 8015M quantified against a crude oil <br /> standard (C8 to C36 carbon range). , <br /> If petroleum impacted soil is observed, then CPL proposes to implement the Technical.Approach j <br /> to Site Evaluation and Decision-Making, Old Valley Pipeline Sites—Central Valley (March 20, <br /> 1997; "Consistent Approach"). The number of soil borings required to define the vertical and <br /> lateral extent of the affected soil will be agreed to between CPL and PHS-EHD's representatives <br /> in the field; at least three additional borings will likely be required. Similarly,the location and <br /> ter samples to be collected to ascertain impact to groundwater will be <br /> number of roan <br /> dwa <br /> numb g p <br /> agreed to between CPL and PHS-EHD representatives in the field. The soil and groundwater <br /> samples will be analyzed for the following constituents as described below: <br /> j • The soil samples will be analyzed for BTEX using EPA Method 8020, PAHs using EPA <br /> Method 8270.SIM, and TPH using EPA Method 8015M quantified against a crude oil <br /> standard (C8 to C36 carbon range). <br />