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r• s,3�- <br /> r 'Chevron <br /> 97Or,T I ' AM II: 32 <br /> October 9, 1997 <br /> Chevron Pipe line Company <br /> 4000 Executive Parkway,Suite 400 <br /> San Ramon,CA 94583 <br /> P.O.Box 6059 <br /> Mr.Michael L Infwua,Jr. San Ramon,CA 94583-0759 <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 388 <br /> Stockton,CA 95201-0388 <br /> Cintra Group Property <br /> San Joaquin County APN No.238-030-22 <br /> Tracy,California 95376 <br /> Dear Michael: <br /> As discussed during your October 1, 1997 meeting with Ms.Elizabeth Lu,representing Chevron <br /> Pipe Line Company(CPL),Mr. Hagop Manuelian,and Mr. Phil Bodem of Morrison Homes,CPL <br /> proposes to advance three borings in the locations shown on the attached figure to determine if <br /> CPL'S historical pipeline operations in the area have adversely impacted site soil and groundwater <br /> in the subsurface. Soil samples will be obtained at the depth which exhibits the greatest evidence <br /> of petroleum impacted soil,as determined through field observations. If there is no evidence of <br /> petroleum impacted soil,the soil sample will be obtained at a depth of 5 feet below ground <br /> surface. A grab groundwater sample will be collected from temporary well casing in each boring <br /> location. <br /> As per CPL'S Technical Approach to Site Evaluation and Decision-Making,Old Valley Pipeline <br /> Site-Central Valley(March 20, 1997;"Consistent Approach'),the soil and groundwater samples <br /> will be analyzed for the following constituents as described below: <br /> • The soil samples will be analyzed for benzene,toluene,ethylbenzene, and total xylenes <br /> (BTEX)using U.S. Environmental Protection Agency(EPA)Method 8020,polyaromatic <br /> hydrocarbons (PAHs)using EPA Method 8310 or 8270, and total extractable petroleum <br /> hydrocarbons (TEPH)using EPA Method 8015M quantified against crude oil. <br /> • The groundwater samples will be analyzed for BTEX using EPA Method 8020,PAHs using <br /> Methods 8310 or 8270,total purgable petroleum hydrocarbons (TPPH)using EPA Method <br /> 8015M quantified against gasoline,and TEPH using EPA Method 8015M quantified against <br /> diesel. <br /> In addition to the analyses listed for groundwater samples in our Consistent Approach,CPL will <br /> have the groundwater samples analyzed for methyl tertiary butyl ether(MTBE) as requested by <br />