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• • • Phase lI ESA Work Plan San Joaquin Regional Rail Commission Page 2 • 1102 E. Weber Ave. (90 feet east of the Site)is the former location of a bulk fuel storage facility that operated for several decades around the 1950s. According to file review at the San Joaquin County Environmental Health Department(SJCEHD), 15 USTs were recently removed from this property. Groundwater at this location may be impacted by petroleum hydrocarbons. • 936 E. Weber Ave. (200 feet west of the Site) is the location of a former leaking gasoline UST. According to SJCEHD files, petroleum hydrocarbon-impacted soil and groundwater remains at this location. • 931 E. Weber Ave. (350 feet west of the Site) is the location of the nearest groundwater boring conducted during a Phase II ESA in 2003. Groundwater contained tetrachloroethylene (PCE), a chlorinated solvent and several SVOCs. • 800 E. Main St. (700 feet west of the Site) is the location of a former service station. Groundwater is impacted by petroleum hydrocarbons at this location. An assumed easterly groundwater gradient direction was utilized when assessing the potential risk posed to the Site from off-site locations. This assumed groundwater gradient is based upon previous groundwater monitoring reports for nearby properties. It should be noted, however, that groundwater gradients in this area have fluctuated significantly over time, and current gradient directions may not represent historic gradients. 3.0 FIELD PROCEDURES 3.1 SOIL SAMPLING PROCEDURES Two soil sampling locations are planned near the former Western Pacific railroad tracks on the east side of the property, six sample locations around the perimeter of the train depot, and four sample locations from the former rail spur areas on the western portion of the Site (Figure 3, Appendix A). Soil samples will be collected from the surface [0 to 6 inches below ground surface (bgs)] and from the subsurface (2.0 to 2.5 feet bgs). Surface soil samples will be collected by removing surface debris; loosening the soil with a stainless steel shovel,and transferring the soil into 9-ounce (oz.)laboratory-supplied glass jars. Subsurface samples will either be transferred into 9 oz. laboratory-supplied glass jars, or collected in brass tubes using a slide- hammer (AST locations). Samples collected in brass tubes will be capped and sealed with Teflon tape and end caps. Each sample container will be labeled for sample identification and placed in a cooler chilled with ice. The sampling equipment will be decontaminated by washing with a solution of laboratory-grade, non-phosphate detergent and double-rinsed with distilled water prior to use at each sample location. The samples will be shipped under chain-of-custody procedures via courier to McCampbell Analytical, Inc. a California-certified laboratory (DHS #1644) located in Pittsburgh, California for analysis. 3.2 DIRECT PUSH BORING FIELD PROCEDURES This section includes a description of the site preparation and groundwater sampling procedures. 3.2.1 Site Preparation Condor will complete the boring permit applications and obtain the required permits prior to initiating field work. The proposed boring locations will be marked with white paint and underground services alert (USA) will be notified at least 48 hours in advance to identify utilities in and near the work area.