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Blue Star - 5 - 25 October 2013 <br /> 4040 E. Main St. <br /> Stockton, San Joaquin Country <br /> Recommendations <br /> Based on available data, the Site meets the criteria for closure under the State Water Board's <br /> Low Threat Closure Policy. Remedial actions included soil excavation and natural attenuation. <br /> Mass estimates were not provided by GHD. Groundwater concentrations appear to be stable to <br /> declining. Staff estimates less than 1 Ib. of TPH remains in groundwater, and that WQO will be <br /> reached in less than 10 years. Remaining Site wells will be destroyed prior to case closure No <br /> Further Action Required. <br /> Attachments: <br /> Figure 1 — Site Location Map <br /> Figures 2A and 2B — Site Plan (GHD) and Extended Site Plan (ATC) <br /> Figure 3 — Potentiometric Surface Map (55-75 feet bgs) <br /> Figure 4 —TPH-g Isoconcentration (55-75 feet bgs) <br /> Figure 5 —Well Survey Locations 2,000 foot Radius <br /> Figure 6 —Soil Gas Sample Locations and Results (5 feet bgs) <br /> Table 1 — Groundwater Flow and gradient Data <br /> Table 2 — Cumulative Analytical Results — Groundwater Well <br /> Table 3 —Well Construction Data <br /> Table 4 — Cumulative Analytical Results - Soil <br /> Table 5 — Summary of Soil Vapor Analytical Results <br />