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` U"T I!' <br /> Department of Toxic Substances Control -� <br /> aMaureen F. Gorsen, Director >. <br /> Linda S.Adams 5796 Corporate Avenue Arnold Schwarzenegger <br /> Secretary for Cypress, California 90630 Governor <br /> Environmental Protection nn <br /> June 15, 2007 <br /> JUN 2 i 2007 <br /> SAN JOAQUIN COUNTY <br /> Mr. Glen Foster, Manager ENVIRONMENTAL HEALTH DEPT. <br /> Environmental Health and Safety <br /> M.S. 140-42 <br /> Tyco Electronics Corporation <br /> P.O. Box 3608 <br /> Harrisburg, PA 17105-3608 <br /> APPROVAL OF THE REVISED FINAL PRELIMINARY ENDANGERMENT <br /> ASSESSMENT REPORT, AND ACKNOWLEDGMENT OF SATISFACTION FOR <br /> TYCO ELECTRONICS CORPORATION, EPA ID NUMBER CAD982370629 <br /> Dear Mr. Foster: <br /> The Department of Toxic Substances Control (DTSC) has reviewed the document <br /> entitled Revised Final Preliminary Endangerment Assessment Report-(PEA Report) <br /> d May 2007 for Tyco Electronics Corporation (Tyco) locate(f at 184$ 0d <br /> eld Avenue, Stockton, California 95203 (site). The PEA {2eport`was required in <br /> pliance with the requirements of. the Corrective Action Consent Agreement Docket <br /> Number SRPD 03/04 SCC-4313 (Consent Agreement). <br /> The PEA Report investigated fourteen Areas of Concern (ADCs) at the site for metals, <br /> volatile organic compounds (VOCs), semi-volatile organic compounds (SVOCs), and <br /> Total Recoverable Petroleum Hydrocarbons (TRPH) in soil and groundwater. Soil gas <br /> sampling was also conducted in order to determine VOC vapor intrusion into indoor air. <br /> The investigation found that except for lead (315 mg/kg) metal concentrations in soil <br /> were within background. An Interim Measure was conducted at the site by excavating <br /> and disposing offsite approximately 28 cubic yards of contaminated soil. After <br /> excavation, confirmatory soil sampling was conducted and the remaining lead <br /> concentration in soil is 57 mg/kg which is below the residential California Human Health <br /> Screening Levels (150 mg/kg). The low levels of VOCs, SVOCs and TRPH detected at <br /> the site were all below the human health screening levels, and all metals in groundwater <br /> were below the Maximum Contaminant Levels. <br /> Based on the PEA Report, the estimated risk of the chemicals of potential of concern <br /> in soil, soil gas and groundwater under the residential land use scenario using the <br /> ® Printed on Recycled Paper <br />