SITE INFORMATION AND CORRESPONDENCE

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0 INFORMATION SHEET Re-Manufacturing Ltd., Rental Machinery Co., and Stanley S. Moore Closure of Surface Impoundment as Class I Landfill San Joaquin County Stanley Moore owns and operates the Moore Industrial Complex, which comprises of Re- Manufacturing Ltd. and Rental Machinery Co., at the northeast corner of Charter Way and Beighle Street, in the City of Stockton. The facility steam cleans, chemically strips paint, and sand blasts trucks and machinery for repainting purposes. Liquid waste, consisting of solvents, acids and other industrial chemicals from the manufacturing processes were disposed to an unlined surface impoundment at the site from approximately 1970 until 1988. In 1987 sampling of the liquid from the surface impoundment revealed hazardous levels of lead. Discharge of liquid hazardous wastes or hazardous wastes containing free liquids to surface impoundments after 1 January 1985 was regulated by the Toxic Pits Cleanup Act(TPCA). In 1989 the Regional Board issued a Cleanup and Abatement Order requiring the Discharger to remove all hazardous materials from the surface impoundment and to submit a hydrologic assessment report for the facility. As part of the site investigation, the Discharger installed 3 ground water monitoring wells to assess the extent of lead contamination in ground water. The Discharger initiated cleanup activities in 1991. Contaminated surface impoundment materials were excavated from the surface impoundment and transported to a Class I landfill. Confirmation sampling of the soils under and adjacent to the surface impoundment indicated hazardous levels of lead extended beyond the surface impoundment unit. The source of the hazardous levels of lead in adjacent soil is possibly due to previous landfilling practices. The closure plan submitted by the Discharger indicated that only surface impoundment materials would be removed. Concentrations of lead above the soluble limit threshold concentration (STLC) for lead remain in place, thus the surface impoundment was not clean closed. Therefore, the surface impoundment was closed as a Class I landfill with remaining hazardous wastes to be left in place. The waste management unit was closed with an engineered clay cap and a gravel drainage layer. A final report and certification for the cap construction has not been submitted by the Discharger. These closure and post closure WDRs are needed for the completion of closure requirements (to include engineering certification) and to implement a quarterly ground and surface water monitoring to measure the effectiveness of the closure activities with respect to water quality protection.