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California Regional Water Quality Control Board Central Valley Region ,Vinston H.Hickox Robert Schneider,Chair Gray Davis Secretary for Sacramento Main Office Governor Environmental Internet Address: http://www.swrcb.ca.gov/—rwgcb5 Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 Phone(916)255-3000•FAX(916)255-3439 TO: Wendy Cohen, Chief FROM: Devra Lewis Private Sites Cleanup Unit Environmental Scientist DATE: 18 July 2002 SIGNATURE: ` . n L � SUBJECT: NO FURTHER REMEDIAL ACTION REQUEST, TRIPLE E PRODUCE, TRACY, SAN JOAQUIN COUNTY I have reviewed the 15 May 2002 Triple E Produce Facility Groundwater Remediation Program Site Closure Request(Closure Request) submitted by Condor Earth Technologies, Inc. on behalf of Triple E Produce(Triple E) for the fresh tomato packing facility at 8690 West Linne Road in Tracy(site). The Closure Request is based on the remediation work performed at the site. The groundwater became polluted with chloroform at concentrations up to 1,900 micrograms per liter (µg/l) from the discharge of wash water from the processing plant to an infiltration pond, which is the source area. From 1996 to 2000, Triple E extracted groundwater and discharged it to the infiltration pond. In June 2000, Triple E shut down the groundwater extraction system with concurrence from Board staff because the discharge to the infiltration pond was continuing to flush chloroform into the groundwater, which is at about 65 feet below ground surface (bgs). Only one of the nine site monitoring wells is on Triple E property. In March 2002, Triple E abandoned seven of the offsite monitoring wells due to construction activities for a new housing development. Triple E is requesting no further action status for the site and lists the following as rationale for this request: 1. Triple E has voluntarily investigated the site since 1989 with no enforcement orders. 2. The chloroform plume is delineated and decreasing, which is evident by decreasing concentrations in the furthest downgradient monitoring well, MW-7, and by concentrations decreasing from a high of 1,900 µg/l in April 1990 to 17 µg/1 in March 2002 in monitoring well MW-4A. 3. Triple E extracted groundwater for four years until Board staff concurred with its shutdown due to increasing chloroform concentrations in monitoring well MW-1, which was from the discharge to the infiltration pond. 4. The site is under Waste Discharge Requirement Order No. 99-123 (WDR) for the process wastewater discharge, which requires annual sampling of monitoring well MW-1. 5. There are no surface water bodies nearby. 6. Concentrations in monitoring wells are below health risk assessment numbers as calculated using the Tier I and Tier H Risk Based Corrective Action Human Health Risk Analysis and compared to the Office of Environmental Health Hazard Assessment no significant risk levels. 7. The deep aquifer, about 100 to 130 feet bgs, is not polluted. California Environmental Protection Agency 0 Recycles!Paper