SITE INFORMATION AND CORRESPONDENCE

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Wendy L. Cohen -2- 4 January 1994 This site assessment failed.to fully define the lateral and vertical extent of the soil and ground water contamination. Therefore, the consultant suggested additional borings southeast of the plume to further define the lateral extent. MGI submitted a report dated 9 December 1987 entitled Results of Additional Site Characterization. This work included seven new borings and two new monitoring wells (N15 and N16), and fully defined the lateral extent of both soil and ground water contamination. MGI estimated that an area of approximately 20,000 ft2 had been affected. The vertical extent of contamination in the ground water still was not fully defined, and soil contamination reached completely to the ground water table. OTHER CORRESPONDENCE IN BOARD FILES 3 April 1989- The environmental consultant for SPPL, Levine-Fricke, submitted an application for an NPDES permit for discharge of treated ground water to Trapper Slough. 27 April 1989- Board staff memo comments on the situation at the time. The memo, by David Brent, confirmed a southeast ground water gradient and characterized the leak as both gasoline and jet fuel. The memo stated that Levine-Fricke submitted a Remedial Action Plan in August 1988 which is not in the Board's files. Mr. Brent noted that extraction wells already had been installed and stated that more work needed to be done before remediation efforts could proceed. Among the additional work was to: 1) define the full extent of the contamination and produce a better ground water gradient map; 2) design a comprehensive monitoring well system; and 3) design and submit details for the treatment system. 5 May 1989- A letter from SPPL to the Board says that the remediation project is on hold until around June 1989 when a lease agreement is expected. SPPL also conf=s that three recovery wells have been installed and that the electrical system has been upgraded to facilitate the remediation system. Construction also has begun on a platform for the system hardware. 25 May 1989- A memo from Mr. Brent describes his meeting with Mr. Walter Risch of SPPL on 3 May 1989. He notes that the Arcady mud site has contributed metals to the ground water and that sampling of Trapper Slough would be needed in order to determine background water quality before discharging treated ground water. He notes again the need to better define the plume with additional wells. They agreed on a time schedule which included free product removal commencing in July 1989, and the ground water treatment beginning in November 1989. He wrote that failure to comply with the time schedule should result in the issuance of a Cleanup and Abatement Order (C&O).