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URS SOO Nwo� July 26, 2012 Mr. James Barton, PG Engineering Geologist Regional Water Quality Control Board 11020 Sun Center Drive#200 Rancho Cordova, CA 95670 Subject: Work Plan for Site Investigation Activities at the Newark Group, Inc., Petroleum Site, 800 West Church Street, Stockton, CA Dear Mr. Barton: On behalf of The Newark Group, Inc., (Newark), URS Corporation (URS) has prepared this Work Plan for Site Investigation Activities at 800 West Church Street in Stockton, California (the Site) (see Figure 1 for Site Location). This Work Plan has been prepared to further assess petroleum impacts in the southern portion of the Site as directed by the Regional Water Quality Control Board (RWQCB) in their ,letter dated June 7, 2012. Work will be conducted in accordance with guidelines established by federal, state, and local regulatory agencies and URS' Standard Operating Procedures (S.OPs) (Appendix A). UTILITY LOCATING Boring locations will be field located and marked prior to mobilizing drilling and sampling equipment. An independent utility location contractor will be retained to evaluate subsurface conditions, such as buried metallic objects and underground utilities, at each boring location. The contractor is expected to use metal and magnetic object detectors and radio detection equipment to detect both existing electrical frequencies and contractor induced electrical frequencies, if required. Additionally, the Underground Service Alert will be notified at least 48 hours prior to the commencement of field activities. Prior to any subsurface activities each location will be hand auger to a depth of approximately 5 feet below ground surface (bgs) for utility clearance. All field activities will be performed in accordance with a site-specific Health and Safety Plan (HSP) which will be available on-site during field activities. DRILLING AND SOIL SAMPLING To further characterize petroleum impacts in the areas of boring B-7 (southwest portion of the site), boring B-14 (southeast portion of the site), and boring B-15 (southeast portion of the site), eleven (11) geoprobe soil borings (SB-1 and SB-11) will be advanced in areas with a history of known impacts at the Site (see Figure 2). Ten of these borings (SB-1 through SB-10) will be drilled to a total depth of approximately 20 feet bgs, or first encountered groundwater. Borings will be continuously cored using clear acetate liners. Soil samples will be retained and submitted for possible analysis at five-foot intervals beginning at five feet bgs and continuing until groundwater is encountered. Samples will also be retained from soils having petroleum staining or odors and from lithological changes. Soil samples will be screened using a photo-ionization detector (PID) and