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CAdIIIIIIIIIIIQL�_ �Pp =014 PEA Work Plan N G I a 1 R I N G Martin Metals Finishing Inc. (Former) Stockton, California 2 PROJECT BACKGROUND 2.1 Purpose The Owner is identifying options for future disposition of the Site along with the eight other parcels comprising Fairgrounds Industrial Park (FIP). This PEA Work Plan has been prepared per the Preliminary Endangerment Assessment Guidance Manual (DTSC, 1994). The purpose of this PEA Work Plan is to describe procedures for collecting data of known quality to address data gaps from previous Site investigations and to collect data representative of current Site conditions, the objective of which is to evaluate the ongoing impact of historical MMF activities on the Site and in Mormon Slough and any necessary remediation or mitigation to achieve Site closure certification from the DTSC. The data generated when implementing this Work Plan will be used to prepare a PEA. 2.2 Site Description and Use The Site occupies a portion of the 6.65-acre San Joaquin County Assessor's Parcel Number(APN) 155- 120-07 within FIP, a multi-tenant industrial business park, which is zoned as Industrial-General (I-G)/ Industrial- Limited (I-L). The Site is an approximately 8,500 square foot unit (Building B-12 of FIP) within an approximately 120,000 square foot warehouse structure of stucco and wood frame construction, and paved parking area (Figure 2). The MMF operations occurred in the easternmost 150 feet of the warehouse and the associated parking area. The Site is surrounded by industrial businesses within FIP,which is bounded to the south by East Charter Way(also known as East Doctor Martin Luther King Jr. Boulevard)and the San Joaquin Fairgrounds, to the north by Mormon Slough, to the west by South Wilson Way, and to the east by other industrial properties. The San Joaquin County Fairgrounds, land zoned for public facilities, is located approximately 300 feet south of the Site, and residential areas are found approximately 600 feet north of the Site. A six-foot chain-link fence with locking gates surrounds FIP and the Site. Since MMF departed the Site in 1990, numerous industrial and light industrial businesses have occupied the Site. It is currently occupied by an industrial business that performs welding and assembly of steel beams. Limited hazardous material use occurs on Site; current Site use does not involve subsurface activity. Figure 3 contains photographs of the existing Site conditions, including the building, concrete drainage trench, drainage pipe, and outfall to Mormon Slough. Operations adjacent to the Site within FIP include sign and panel manufacturers, a garage door supplier, a rubber and gasket company, van transportation storage, architectural stone storage, warehousing, and outdoor storage of truck bodies. The current and proposed future Site use is industrial, and the future Site owner may redevelop the Site for commercial or industrial use. No residential land use is proposed for the Site. 2.3 Site Geology and Hydrogeology The general topography at the Site is flat with a gentle slope to the north towards Mormon Slough.Surface elevation at the Site is approximately 20 feet above mean sea level (ft amsl). The Site lies on the northern portion of San Joaquin County and within the Great Valley geomorphic province. Geologic formations underlying the Site include layered alluvial fan deposits consisting of gravelly loam (silt-clay materials) and sandy loam from granitic CDIM—Fairgrounds Industrial Park Page 2