Laserfiche WebLink
L <br /> Property at 30600 South Corral Hollow Road <br /> Tracy, California <br /> Exploratory Excavation for Re-Sample <br /> Work Plan <br /> L <br /> 1.0 PROJECT IDENTIFICATION <br /> This work plan has been developed to investi ate a former underground storage tank <br /> P P $ 8r 8 <br /> facility 30600 South Corral Hollow Road in Tracy, California (Figure 1). The scope of <br /> work proposes to explore the vertical and lateral extent of diesel, gasoline and petroleum <br /> constituents having been released to the soil in the vicinity of the recently removed <br /> underground storage tanks and associated piping. The objective of the proposed work is <br /> to capture all of the contaminated soil using equipment better suited for excavations <br /> beyond the tank removal phase. <br /> 1.1 Site History <br /> Shortly before the requirements for double walled tanks, eight single walled <br /> underground storage tanks were installed at this facility. The tanks were in <br /> operation from about 1985 to 1994. <br /> LOn or about March 18, 1998, SEMCO obtained a tank closure permit and <br /> removed all eight, 12,000 gallon underground storage tanks from the subject <br /> property. Soil samples were obtained at various depths (15 feet maximum) from <br /> under the tanks, piping and dispenser islands (Figure 2). The soil samples taken <br /> under the tanks and dispensers near the southeast portion of the facility disclosed <br /> the highest concentrations of petroleum hydrocarbons (Appendix A). <br /> 2.0 SITE WORK PLAN <br /> SEMCO, with the assistance of M.J. Kloberdanz & Associates, proposes to enlarge the <br /> previously excavated area, around the former fuel tanks and dispenser islands, in an <br /> attempt to define andpQ jdrX remove the petroleum contaminated soil. The approximate <br /> extent of the area to be excavated is shown in Figure 3. The depth of the excavation is <br /> L expected to be limited to 25 to 30 feet. Soil samples will be screened with a portable PID <br /> during excavation, with laboratory samples taken of the floor and side walls once a clean <br /> interface is reached. The soil sampling will be conducted in accordance to appropriate <br /> ! sampling protocols, and samples will be sent to a State certified lab. The soil type will be <br /> L• logged during the excavation by qualified personnel working under the direction of a <br /> registered geologist. <br /> L <br />