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®:M PEA Work Plan .•a H.e R H a Martin Metals Finishing Inc. (Former) Stockton, California sludge and slough soil samples near the outfall. The PA found that groundwater and surface water at the Site do not pose a threat to human health or the environment because groundwater in the Site area is deep and not used for drinking, food, or recreational purposes and the nearest surface water body is greater than 2 miles from the Site. The PA also found that potential contamination in soil at the Site did not pose a threat to human health or the environment because the Site is paved, Site access is restricted, and no schools, residences, or daycare centers were within 200 feet of the Site.On March 25, 1999, USEPA Region IX approved DTSC's PA and prepared the Remedial Site Assessment Decision that states the Site does not require further action under CERCLA and is not eligible for CERCLA because of limited receptors and target population (USEPA, 1999). The PA does note that the Site has been under State and local oversight. The Site is currently under DTSC oversight and is listed on the DTSC Envirostor database under two IDs: the most recent entry lists the Site as active with a voluntary agreement(Envirostor ID: 60003373), and the historic entry lists the Site as inactive and needing evaluation (Envirostor ID: 39300004). No Site closure documents have been identified. Below is a simplified chronology of reported violations and environmental assessments for the Site (DTSC, 1998): • March 22, 1984:the City issued a violation notice to Martin Metals for illegal discharge to Mormon Slough. • March 23, 1984: the City notified the Central Valley Regional Water Quality Control Board (CVRWQCB)of the illegal discharge. • May 18, 1984: CVRWQCB requested that MMF submit a sampling plan to define the lateral and vertical extent of contamination in Mormon Slough (CVRWQCB, 1984). • September 22, 1987: California Department of Health Services (CA DHS, predecessor to DTSC) issued a Report of Violation and Schedule for Compliance due to hazardous waste violations(CA DHS, 1987). • February 22, 1989: CA DHS issued a field notice of violation due to hazardous waste violations. • May 3, 1989: CA DHS issued Report of Violation and Schedule of Correction (CA DHS, 1989). • December 28, 1990: CA DHS Site Screening recommended a PEA due to chromium in sediment. • 1997: USEPA Region IX performed a Site Screening (EPA ID CAD982029928) under CERCLA. Chromium, copper, lead, toluene and zinc quantified or suspected due to plating waste disposal to trench and Mormon Slough. USEPA recommended further Site investigation under State lead. • March 2, 1998: DTSC published the PA(DTSC, 1998). • October 16, 1992: The Site is listed on USEPA's Comprehensive Environmental Response, Compensation, and Liability Information System (CERCLIS). • March 25, 1999: USEPA Region IX approved DTSC's PA. The document notes that State and local oversight is occurring (USEPA, 1999). CDIM-Fairgrounds Industrial Park Page 4