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{" 9 Petroleum Tanker Spill Response,S, ,xcavation,and Confirmation Soil Sampling Result Rer__� a Williams Tank Lines Fuel Tanker Spill,22934 E.Mariposa Road,Escalon,California Page 2 emergency stops and rain water drainage from the traveled road way. The shoul r that was'MENIAL .. . R; excavated is the property of San Joaquin County (Figure 2). When the tanker came to rest,the impact caused an unknown volume of unleaded fuel to leak from the ruptured bulkheads of the tanker compartments to site soils (Figure 2). EMERGENCY RESPONSE AND SITE CHARACTERIZATION ACTIVITIES The unleaded gasoline released during the accident burned for approximately 4 hours before being extinguished. The spill area which is the property of San Joaquin County is depicted on Figure 2. The owner of the residence at 22934 E. Mariposa Road adjacent to the excavation site allowed Apex and crews to enter the property and stockpile any contaminated soil on visqueen until proper arrangements could be made for the disposal. On September 6, 2013,Apex advanced six soil borings (B-1 through B-6) at the locations shown on Figure 2. To further define the area that had been impacted with unleaded fuel and quantify the amount of soil that was needed to be excavated. The soil borings were advanced at the locations where the highest contaminant concentrations were detected with the use of a photo ionization detector(PID). Soil borings B-1 and B-4 were advanced to a total depth of 15 feet below ground surface(bgs) and soil borings B-2,B-3, B-5, and B-6 were advanced to a total depth of 4 feet bgs. Groundwater was not encountered in any of the soil borings advanced. Prior to drilling, permits were obtained from the SJCEHD and the public works department for the advancement of soil borings B-1 through B-6. Underground Service Alert was contacted for identification of buried utilities at or entering the project site from the public right-of-way. Soil Sampling Soil samples were collected continuously to total depth at soil borings B-1 through B-6. All soil samples were screened in the field with the use of a photo ionization detector(PID), and were classified using the Unified Soil Classification System(USCS). All fieldwork was conducted in accordance with Apex standard operating procedures (SOP). Samples submitted for analysis from soil borings B-1 and B-4 included the samples from 15 feet bgs, the samples that exhibited the lowest PID reading. Samples submitted for analysis from soil borings B-2,B-3, B-5, and B-6 included the samples from 4 feet bgs, the samples that exhibited the lowest PID reading. Samples were submitted, under chain-of-custody(COC) documentation, to a state-certified laboratory for the analysis listed below. The laboratory analytical results are summarized in Table 1.