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Chevron Chevron Pipe Line Company _� 555 Market Street, San Francisco, California Mail Address: P.O.Box 7141,San Francisco,CA 94120-7141 Tracy, California December 2, 1987 ENVIRUME:�TAL HEALTH FER!AIT/SERVICES ALDEN PARK NEWSLETTER # 6 Dear Alden Park Area Homeowner: Holiday greetings! Once again, we want to update you on our work and clean up plans in the Alden Park Area. Over the next few months, you will see various activities in the park which are described later in this newsletter. Summary of Site Assessment Activity The environmental consulting firm of Dames and Moore completed their site assessment of the Alden Park Area and two copies of the report are in the reference section of the Tracy Library for you to read. Some of the highlights of the site assessment are: The remains of the circular concrete reservoir were found beneath most of Alden Park approximately six feet below ground. The location and extent of oily dirt was determined at 2, 4 and 8 foot depths around the park. Except for the northeast side of the park, clean soil was observed in soil borings within 300 feet of the park edge. Liquid oil was observed in four of the 17 groundwater monitoring wells installed in and around the park. The liquid oil appears to be highly insoluble (won't dissolve) in ground water, and due to its viscuous (sticky) nature, has not migrated very far from Alden Park. The results of the analytical testing of the oily soil and groundwater indicate that neither would be classified as hazardous according to California Department of Health Services criteria. Preliminary Mitigation (Clean Up) Plan Meeting On Thursday, November 12, 1987, we presented our preliminary mitigation plans to the City of Tracy and involved regulatory agencies. The plans are preliminary until we complete some field tests of two possible clean up technologies.