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• 14 I(LEINFELDER 1 INTRODUCTION 8, SUMMARY This document Kleinfelder's Draft Prelimina Presents (PEA) Workplan for the Delta Plating facility located at 818 S. tanislaus Street in Stockton, California (Plate 1 and 2, ry Endangerment Assessment Delta Platin Appendix A). It is Kleinfelder'ssunderstanding that Department g Inc. has signed a Corrective Of Toxic Substances Action Consent Agreement with the SRPD04/05SCC-4324 and the EPA ID Control (DTSC). Number is CAD068845254,Docket Number is This workplan was prepared and the proposed investigation will be conducted in accordance with the general guidelines of the Cal/EPA DTSC Preliminary Endangerment Assessment Guidance Manual (January 1994, second 1999). Printing June DTSC performed a Phase I Assessment "Checklist Verification Inspection" of the site on May 20, 2004. The findings are presented in a document titled 'Phase I Assessment; Delta Plating, Inc., Stockton, California 95206 EPA ID Number CAD068845254", dated June 22, 2004. The primary Areas of Concern (AOC) to be addressed were identified as the Main Plating Room and Wastewater Treatment Area. The Constituents of Potential Concern (COPC) were identified as acids/bases, chromium III, Chromium VI, nickel, copper, cyanide and aluminum. 1.1. SUMMARY OF BACKGROUND INFORMATION The following background information was primarily derived from DTSCs inspection conducted on May 20, 2004 and site observations by Kleinfelder. Delta Plating includes approximately eight buildings on 0.56 acres in a commercial setting located at 818 Stanislaus Street. The Atchinson Topeka and Santa Fe Railroad border the site to the north, residential housing to the south, Stanislaus Street and commercial/industrial area to the west and a vacant field to the east. Primary activities at the site was reported as repairing damaged bumpers followed by chrome plating. Plating operations have occurred at the site for approximately the past 30 years since approximately April of 1974. The site stopped operations in 2005. The main plating room (Plate 2) is approximately 50 by 30 feet with concrete flooring and contained approximately 21 bath tanks using various metals including acids/bases, Chromium Vl, nickel, copper, cyanide, rinse tanks, and former hazardous storage area. A wastewater treatment area is located north of the plating room receiving waste water from the plating operations. This area is located on concrete with both plastic lined concrete vaults and above ground storage tanks (ASTs). Secondary containment was generally noted or reported with the ASTs and process equipment. Treatment I equipment included clarifiers, filter press, holding tanks, acid pH adjustment tanks, sodium hypochlorite tanks, sodium metabisulfite tank, polymer tanks, batch tanks, and Page 1 of 29 5T252.T02IST05F?M DH:Iv September 1,2005 0`1�05�e!doi,h,