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09/23/98 WED 16:29 FAX 415 434 1365 GEOMATRIX SF �JQO1 <br /> September 14, 1998 Chevwon Pipe tine 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 94563 0759 <br /> San Joaquin County Public Health Services <br /> Environmental Health Division past-Ir Fax Note 7671 Dato 9 z3 $ page.D' ` <br /> P. O. BOX 388 To Mt ke �� w./� f— _ <br /> Stockton,CA 95201-0388 E;-M—w Co. <br /> pftne X Phone N <br /> Work Plan for Field Investigation 3 sex« <br /> Mansfield Property3 <br /> 13880 W.Grant Line Road,Tracy,CA 95376 <br /> Dear Michael: <br /> Enclosed please find a completed Master File Record Information form(i.e.,Green Form)and a <br /> check for$234.00 for the purpose of opening a San Joaquin County Public Health Services– <br /> 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 /> 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(Cg to Cab carbon range). <br /> If petroleum impacted soil is observed,then CPL proposes to implement the Technical Approach <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 /> number of groundwater samples to be collected to ascertain impact to groundwater will be <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 /> V 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 />