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MEMORANDUM CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD - CENTRAL VALLEY REGION 3443 Routier Road, Suite A Phone: (916) 361-5600 Sacramento, CA 95827-3098 ATSS Phone: 8-495-5600 TO: ANTONIA K.J. VORSTER� G!/ ' FROM: ROBERT A. EVANS Senior Engineer Area Engineer DATE: 17 October 1990 SIGNATURE: SUBJECT: 21 AUGUST 1990 MEETING, TRACY ESTATES, SAN JOAQUIN COUNTY On 21 August 1990, I met with C & L Tracy Group Partnership (TGP) (see attached attendance list) to discuss the field work completed for the Problem Assessment Report, Potential Soil and Ground Water Contamination, Phase II - Sung 5 Property (1 August 1990) in Tracy, CA. Although the overall investigation is being conducted to determine the extent of soil and ground water contamination at the site, the field work was conducted in the area to be ceded to the city of Tracy for a city park. The report states that the ground water immediately below the contaminated soils may contain low concentrations of total petroleum hydrocarbons derived from crude petroleum. Results indicate that the contaminated soil is confined to the area designated for the City Park. All evidences indicates that petroleum was discharged from historic use of subsurface pipelines throughout the Tracy area, specifically along the railroad right-of-way. The Report also states that ground water contamination has been more difficult to confirm due to unreliable laboratory data. However, reliable data indicates that non- detectable to low levels of petroleum constituents can be found in the ground water. TGP proposes to monitor and sample ground water in September and December 1990 to conform previous monitoring data collected. The Report states that the hydraulic gradient is 0.002 feet per foot. I recommend that we approve proposed development at the site in which residential housing will be built on the non-contaminated portion of the property and a city park will built on the portion where soil contamination has been found. The developer and the City of Tracy have agreed not to develop the city park in such a manner which would prevent future investigations or remedial actions. Additionally, the site should be referred to the Spills/Leaks Investigation and Cleanup Unit at the Regional Board for all further oversight and coordination with DHS. TGP will complete a Preliminary Endangerment Assessment (PEA) for the Department of Health Services (DHS) . The PEA will address the risk presented by contamination and remedial activities necessary to protect public health. DHS has informed TGP that oversight by DHS will not be possible until January 1991 . Therefore, TGP request approval to proceed with developing the site since development in the area with soil contamination will not prevent future investigation or remedial efforts for soil and ground water. Additionally, TGP recommends that the area-wide soil contamination should be addressed on a regional basis rather than a site-by-site basis. RAE Attachment