SITE INFORMATION AND CORRESPONDENCE

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WASTE DISCHARGE REQUIREMENTS -2- RE-MANUFACTURING LTD, RENTAL MACHINERY CO., INC., AND STANLEY S. MOORE CLOSURE OF SURFACE IMPOUNDMENT AS CLASS I LANDFILL SAN JOAQUIN COUNTY Cleanup Act(TPCA), the surface impoundment was ordered to be closed. Active disposal of waste to the impoundment was discontinued in 1988. 6. In August 1990 Administrative Civil Liability Order No. 90-236 was issued to the Discharger ordering the Discharger to pay a$128,500 administrative civil liability for violations, to submit a Hydrogeologic Assessment Report, and to submit and implement a closure plan in accordance with the TPCA program. WASTES AND THEIR CLASSIFICATION 7. The Discharger has discharged industrial liquid waste including a variety of solvents, petroleum wastes, acids, and other industrial chemicals for disposal in the unlined waste management unit as shown on Attachment B. These wastes are classified as hazardous liquid and solid waste. The waste management unit has no leachate collection and removal system (LCRS). No additional wastes are proposed for disposal at the facility. Although surface impoundment wastes have been removed, the subgrade soils contain chemical constituents at concentrations which render the soils hazardous. Lead concentrations in the waste were found to exceed the soluble threshold limit concentration (STLC) for lead of 5.0 mg/l. The maximum soluble concentration of lead in the impoundment and surrounding soils is 21 mg/l. The Discharger closed the existing surface impoundment as a landfill in 1992. SITE DESCRIPTION 8. The topography of the site is nearly flat. The elevation of the site is approximately 20 feet above mean sea level (MSL). 9. Land within 1000 feet of the facility is used for commercial businesses, light industry, and housing. 10. The soils immediately underlying the WNW are predominately silt with sand and lean clay (MH and CL in the Unified Soil Classification System). Lenses of sand and silt intermix with the clays to 18 feet below ground surface. Below 18 feet soils grade to silty sands and sandy silts and then to coarser fine and medium grained sands with intermixed silts and clays. 11. There are no known Holocene faults near the Re-Manufacturing facility. The closest active fault is the Greenville fault which is approximately 26 miles southwest of the site. A maximum credible earthquake in the area will produce a ground acceleration of 0.2 g at the facility. 12. Ground water level elevations vary between 56 feet and 62 feet below ground surface. The hydraulic gradient direction is towards the northeast and Mormon Slough. Aquifer conductivity in the silty fine sand and the fine to medium sand (at 66 feet below ground level) varies from 4x 10-6 to 1 x 10-3 cm/sec.