SITE INFORMATION AND CORRESPONDENCE

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STATE OF CALIFORNIA ENVIRONMENTAL PROTECTION AGENCY DEPARTMENT OF TOXIC SUBSTANCES CONTROL In the Matter of: ) Docket No. _HSA-A 99/00-022 Old Valley Pipeline Right of Way ) Voluntary Cleanup Agreement located on Mansfield Property ) Tracy, California ) Project Proponent ) Health and Safety Code Chevron Environmental Management ) Section 25355.5(a)(1)(C) Company ) 6001 Bollinger Canyon Road ) San Ramon, California 94583 ) I. INTRODUCTION 1.1 Parties. The California Environmental Protection Agency, Department of Toxic Substances Control (DTSC) enters into this Voluntary Cleanup Agreement (Agreement) with Chevron Environmental Management Company (Proponent). 1.2 SAa. The property which is the subject of this Agreement (Site) is located at 13880 West Grant Line Road, Tracy, San Joaquin County, California, 95376. The Site consists of the Old Valley Pipeline Right-Of-Way located on the Mansfield Property. The Site property consists of 17-acres and is identified by Assessor's Parcel Number(s) San Joaquin County APN 209-260-30, Tracy, California. A diagram of the Site and a location map are attached as Exhibit A and Exhibit B. 1.3 Jurisdiction. This Agreement is entered into by DTSC and Proponent pursuant to Health and Safety Code (H&SC) section 25355.5(a)(1)(C). This section authorizes DTSC to enter into an enforceable agreement with Proponents to oversee the characterization and cleanup of a Site. 1 .4 Purpose. The purpose of this Agreement is for the Proponent to obtain DTSC's oversight in reviewing and obtaining comments to the "Soil and Groundwater Investigation and Screening Health Risk Assessment of the Old Valley Pipeline Right- of-Way," dated September 1999. The purpose of this Agreement is also for DTSC to obtain reimbursement from the Proponent for DTSC's oversight costs. II. BACKGROUND 2.1 Ownership. The Site is owned by Mr. Richard and Mrs. Darlene Mansfield.