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ENVIRON , February 10, 2012 San Joaquin County Environmental Health Department 600 East Main Street Stockton, CA 95202-3029 Re: Work Plan for Limited Phase II Investigation Ro-Lab American Rubber Company 8830 and 8872 West Linne Road, Tracy, California To Whom It May Concern: This work plan was prepared to meet the requirements for obtaining a drilling permit from the San Joaquin County Environmental Health Department (SJCEHD). This letter describes the rationale and scope of work for a limited Phase II investigation at Ro-Lab American Rubber Company (RLA), located at 8830 and 8872 West Linne Road in Tracy, California (the "site", Figure 1). Phase I Environmental Site Assessments were completed at the site by Transaction Management Corporation, Inc. (TMC) in October 2008 and by ENVIRON International Corporation (ENVIRON) in late 2011. ENVIRON'S Phase I ESA identified four septic systems and associated leach fields at the site that are reported to receive only sanitary wastewater. This limited Phase II investigation is intended to investigate soil conditions in the vicinity of the septic system leach fields, as well as groundwater quality downgradient of the main chemical use areas. Background RLA leases and operates a rubber and urethane parts and components manufacturing facility located at 8830 and 8872 West Linne Road in Tracy, California. The approximately 9.7-acre, irregularly-shaped property is developed with five one-story buildings, including four industrial buildings and one office building, totaling approximately 76,650 square feet. Other site structures include a water tank, two three-sided storage structures along the western side of the site, three pad-mounted transformers, and a rail spur along the western edge. The facility also maintains two on-site water wells, both on the southeastern corner of the site. Two storm water infiltration ponds are located on-site, on the northeastern and southwestern ends. Based on the 2011 Phase I ESA, portions of the site buildings were constructed in the 1930s or 1940s associated with tomato packaging activities performed on-site at that time. RLA began leasing a portion of the site for rubber and urethane parts and components manufacturing operations in about 1978, and at that time a different portion of the site was occupied by a tire retreading operation. The current site owner (also the President of RLA) acquired the property in about 1980, shut down the retreading operation in about 1981, and expanded RLA's leasehold to the entire site. 175 North Corporate Drive,Suite 160, Brookfield,WI 53045 w .environcorp.com Tel:+1262.901.0099 Fax:+1262.901.0079 h 1wmU12t1969a da mNhne iAbmng pemat epplicabcftork plan.docx