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��; � NG, l t .'Z1 '7�51U 12 1f,4:5U 111E1 1'li'l�: LAIf I0'1U1 5 [Neuron August 22, 1996 Chevron Michael J. Infurna Jr. Chevmn Pipe time Company San Joaquin County Public hSan Ramon,ealth Services 4000 ,C Parkway.$UItQ 400 t;A 945tH Envirvnmienial I Icalth NvIslon t'o.Box 5059 P.O. [lox 388 $nn neuron,CA 94501.0959 Stockton,California 95201-0388 Sousa Property (APN 238-080-01) l,annmerin & Myron Road,Tracy, California Dear Mr. Infurna: Chevron Pipe Line Company (CPL)would like to confirm with the San Joaquin County Public Health Services Environmental Health Division (SJC-EIW) that no envirorunuental investigations, remediation,or other efforts are required to be conducted by CPL cn the Sousa Property, located at the intersection of Larnmcrs and Byron Road,Tracy Califomia. The property is located south(across Byron Road)of We Dividend Property, where Cl'L's has conducted cnviroamental investigations in the past and is currently negotiating closure with the Central Valley regional Water Quality Control Board (CVRWQCD). Previous work at the subject site was conducted by Mill Creek Associates (MCA)on behalf of other parties. Please reference the attached MCA letter to the SJC-EIID dated February 16, 1995. This work was also transmitted to the CVRWQCB in Mill Creek Associates letter dated February 13, 1996(attached). Outlined below is a summary of this work and the rational for concluding that CPL,operations, or operations of their predecessors, have not irupacted the subject property: • The subject property is at approximately 1000 feet south of the Dividend Property and is not adjacent to CPL's pipeline right of way, which runs parallel to Byron Road (MCA Site Plan, Figure 1). • The groundwater gradient, as shown in MCA groundwater gradient map (Figure 2), is to the north, thus placing the subject property up-gradient to any potential CPL sources. Decent groundwater sampling at the Dividend Property confirms a northerly gradient for the area. • Only one soil sample exhibited detectable concentration of hydrocarbons (Sample MW-3-1 at 60 mg/kg) using EPA Test Method 418.1; a screening method that is non-analyte specific and subject to many positive interferences from non-petroleuw sources. Laboratory analysis of soil samples using more specific methods(UPA Test Method 8015 modified for gasoline, diesel, and kerosene) exhibited non-detectable concentrations of petroleum hydrocarbons. • 'Fhe lack of detectable levels of petroleum hydrocarbons in the groundwater. • All soil and groundwater samples exhibited non-detectable levels of benzene, toluene, ethlybenzene,and xylenes.