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Work Plan—Site Sampling Page 4 West Weber Site-Stockton GPE Project 536.2 7. BrinelChromium Release Prior to 1988, Building One of the Stockton Cold Storage facility was also the site of an ammonia cooling system that also operated with a brine solution that acted as a secondary refrigerant. The solution included chromic acid, a chromium-based additive as a corrosion inhibitor. In BSK's Phase I ESA (1999), leakage and corrosion were noted in the area of the in a room adjacent to the transfer pumps. It is not known if soil under the area may have been impacted by chromium. 8. Adjacent NPL Site The former wood treating facility of McCormick and Baxter lies across the Old Mormon Slough from the West Weber site(U.S. EPA, 1999&2000). The facility is a U.S.EPA"Superfund"site and is the target of a remedial investigation for releases of various heavy metals and semi-volatile organic contaminants that have impacted the soil and groundwater. The U.S.EPA has conducted investigations to determine the extent of contamination and this work has included collecting soil and groundwater samples under the slough and the from the subject West Weber site. The soil data indicated contamination is not present in the soil or shallow groundwater under the W. Weber site, although the deep groundwater has not hey been adequately investigated. Two parcels belonging to the McCormick and Baxter site are directly adjacent to the east side of the Stockton Cold Storage property. These parcels are part of what EPA has designated as"Subarea X, and they were used to store treated wood. EPA soil sampling has found evidence of shallow soil contamination resulting from the wood storage. The contamination is largely restricted to the upper one foot of soil, and the primary contaminant is arsenic. The EPA Record of Decision (ROD) pertaining to the McCormick and Baxter site indicates the impacted soil will be excavated and placed on the main area (Subarea Y) of the McCormick and Baxter site. The Conceptual Site Model Diagram (Figure 9) provides a summary of the potential contaminant pathways and receptors. 1.5 Scope of Work This Work Plan describes a group of soil gas samples, shallow soil samples, and soil boring samples that will be collected and tested for the possible presence various chemicals. The chemicals to be tested include 17 contaminant heavy metals (CAM-17), semi-volatile organic chemicals (S-VOCs), organo-chlorine pesticides, and extractable petroleum hydrocarbons. The sample points will include the following groups: • 12 soil gas sample points from the three former leaking underground tank sites, • 59 targeted and 13 random shallow sample points (144 total samples) as follows: Rail spurs—46 sample points Brine Release Site— 1 sample point Fill material spreading field— 13 sample points Semi Volatile Organic of Uncertain Origin, 6 sample points Stockton Cold Storage— Shop, 6 sample points • 58 screening shallow sample points (116 total samples),,in a grid of two points per acre, and • 14 soil borings (14 groundwater and 33 soil), as follows: 2937 Veneman Avenue, Suite B240 Geo-Phase Environmental Inc. Phone: (209)569-0293 Modesto, Ca 95356 Fax: (209) 569-0295