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Chevron <br /> Chevron Pipe line Company <br /> June 9,1998 acro En.vnw Pmrx .supe 400 <br /> San Ramon,CA 94563 <br /> P.O.Box 6059 <br /> San Ramon.CA 945E3.0759 <br /> Mr.Michael J.Infuma,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 2199E <br /> Surland Homes Property su+. 114 co:hm <br /> San Joaquin County APN No.238020-11 E>mRo�M HH�T + <br /> Tracy,California <br /> Dear Michael: <br /> Chevron Pipe Line Company(CPL)proposes to advance three borings in the locations <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 impactedfie✓/ <br /> soil,as determined through field observations. In addition,a grab groundwater sample �irrp'i <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 Sire Evaluation and Decision-Making,Old Valley <br /> Pipeline Sias-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,ethylbetizene,and total <br /> xylenes(BTER)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 Crede oiL <br /> • The groundwater samples will be analyzed for BTE%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 /> SAN jOAQUEN COUNTY <br /> EN1,!! aNMENTAL HEALTH DIVISION <br /> 304 E. Weber Ave.Third Floor <br /> P.C. Box 388, Stockton, CA 95201-0388 <br /> Phone: (209) 408-3420 <br /> 13 Approved <br /> Approved with changes: See Remarks <br /> ❑ Disapproved: See Remarks <br /> Remarks— <br /> vc� <br /> Approval of these plans exte s only to that <br /> which is shown ad described hereon but <br /> does not authorize or approve any omission <br /> or deviation of requirements of State laws or <br /> Loc::4l Ord;nancos-. <br />