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DWorkplan- . i Moffat Boulevard Property . August 8,2013 SITE DESCRIPTION AND BACKGROUND The approximate 1.1-acre subject site is located within a mixed agricultural and commercial/light-industrial area of Manteca, San Joaquin County, California. The subject property is identified by the San Joaquin County Assessor's Office as parcel number(APN) 228- 050-05 and is currently addressed as 1813 Moffat Boulevard. The site is currently unoccupied and supports an office/warehouse building, a shed-like structure, and associated pavements. Our Phase I research indicates that the site was developed in the mid-1960s; from that time until the late 1990s, the subject property was used as a facility for the fabrication, refurbishing, and repair of tanks and truck trailers for the commercial trucking industry. Superior Stainless reportedly occupied the site from the 1960s until the late 1970s and Beall Trucking occupied the site from the late 1970s until the late 1990s. Readily available information regarding on-site activities prior to the late 1990s is very limited. It is indicated that, an on-site septic disposal system was installed beneath the property at the time of initial site development, and a subsurface waste water collection sump was installed near the septic system by Superior Stainless sometime in the late 1960s or early 1970s. It is our understanding that the sump was used by both Superior Stainless and Beall Trucking for the collection of waste water generated during industrial cleaning activities, including the steam cleaning of tank interiors. Our research did not reveal any specific information regarding the sump use/waste water discharged during Superior Stainless' occupancy of the subject site. Reportedly, the majority of the tanks cleaned by Beall Trucking were used for storage of food products such as wine, milk, and vegetable oil. However, it is indicated that some of the tanks cleaned by Beall Trucking had been used for transporting corrosive chemicals (and possibly petroleum products and/or fertilizers). Our research and reconnaissance did not reveal any substantive information regarding the configuration of the waste water sump and it is unclear if the sump is designed to be an oil-water separator, whether the sump is connected to the nearby septic system, or if/where the sump ultimately discharges. From the late 1990s until earlier this year, the subject property was occupied by a fork lift sales, leasing, and repair business (Watts Equipment). On-site repair activities performed by Watts Equipment included the use and storage of hazardous materials including, oils/lubricants, coolants, and solvents. Reportedly, Watts Equipment removed the steam cleaning equipment from the vicinity of the sump and it is indicated that Watts' activities did not include the discharge of waste water to the subsurface sump. Reportedly, Watts Equipment recently vacated the subject property, and the site has been unoccupied and unused since May 2013. The subject property was used for commercial/light-industrial purposes (including the on-site use/storage of hazardous materials) for nearly 50 years. Operations have included the on-site use of a subsurface sump that was historically used to collect waste water generated during industrial cleaning activities and an on-site septic disposal system. In our experience, subsurface features such as waste water collection sumps and septic systems used at commercial/industrial sites can facilitate the discharge of hazardous substances to the subsurface. As such, our referenced Phase I study concluded that the potential exists that that the long term light-industrial use of the subject property may have resulted in the discharge of hazardous materials to the subsurface, particularly in the vicinity of the sump and septic system.