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A r ,A OF 7 DEPARTMENT OF HEALTH SERVICES - FACT SHEET, AUGUST 1989 C, LIKA CORPORATION REMEDIAL ACTION FOR CONTAMINATED MATERIALS AT 2041 NAVY DRIVE, STOCKTON Summary The Department of Health Services (DHS) has approved a Final Remedial Action Plan for cleanup of contaminated materials at LIKA Corporation's former Navy Drive circuit board manufacturing facility. Contaminated concrete and soil will be excavated and disposed off-site, as explained below. This remedial action was selected after public review and comment on a draft Remedial Action Plan that was circulated in August and September, 1988, and discussed at a public meeting on September 28, 1988. Copies of the Final Remedial Action Plan are available for public review at the Stockton Library, 605 N. El Dorado Street, and at LIKA's present facility at 1443 Navy Drive. Contaminants Elevated levels of lead and copper are present in soils and concrete at the site. Lead and copper were also detected at elevated levels in groundwater in 1985 and 1986; samples in 1988 showed much lower levels of the metals. Chemicals used in the etching and plating process were the sources of the lead and copper. Concrete and soils were contaminated through leaks in the concrete sump in the "wet room," spills across an outside concrete sidewalk, and drainage from an outdoor concrete sump. Cleanup Levels The site is presently in an industrial setting. However, taking a conservative approach, LIKA used DHS calculations for acceptable cleanup levels based on the exposure of children to soils in a residential setting. They determined that soil cleanup leaving a mean residual level of 46 parts per million (ppm) of lead would not threaten the health of children or adults even if the site becomes residential in the future. DHS found that copper is not a concern at this cleanup level for lead, because cleaning up for lead will remove copper to concentrations that pose no health risk. Cleanup Procedures Contaminated concrete and soil with lead concentrations above 1000 ppm or copper above 2500 ppm will be excavated and disposed at the Kettleman City "Class I" landfill in Kings County. Wastes with concentrations above these levels are classified as "hazardous wastes" under California law. Class I landfills are designed to receive materials classified as hazardous wastes. Soil with mean lead concentrations below 1000 ppm but above 46 ppm will be treated by mixing with cement and other additives to fix or immobilize the metals. Treated soils will be tested for certification as "nonhazardous." After certification, they will be disposed at the Foothill "Class III" landfill in Linden, San Joaquin County. Class III landfills are designed to receive nonhazardous wastes. Clean soil will be used to backfill the excavation, and a concrete or asphalt cap will be placed over the top of the excavated area. Any water that is pumped from the excavation during cleanup will be stored and sampled to verify that it meets discharge standards for the Stockton Municipal Treatment Plant. If pretreatment is necessary to meet standards, the water will be transported to LIKA's 1443 Navy Drive facility and pretreated before discharge.