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available is adequate, an opinion will be rendered regarding the ability to conduct further <br /> excavation of the pit sidewalls near the building , or the deepening of the excavation. If the <br /> data is not adequate a number of geotechnical borings may be necessary to develop the <br /> needed information. Borings would also be utilized for definition of TPH distribution. <br /> 3.4 Stockpiled Soil Sampling <br /> Soil samples will be collected from the stockpile and analyzed for TPH as gasoline and diesel <br /> and BTEX. Samples will be collected from a grid, which will be laid out on the newly <br /> graded soil pile. One sample will be collected from approximately each fifty (50) cubic <br /> yards of material. Samples will be collected using a modified California sampler of <br /> equivalent, using cleaned brass liners. The brass sleeves will be capped with teflon, sealed, <br /> labeled in accordance with EPA protocol, recorded on a chain of custody form, placed in a <br /> cooler at 4 degrees Centigrade or less, and transported to a California certified analytical <br /> laboratory for the specified analyses under proper chain of custody documentation. <br /> Sidewall and pit bottom samples will be collected using a backhoe. Due to the depth of the <br /> excavation and the vertical sidewalls, no personnel can enter the excavated pit unless <br /> shoring is installed. Sample locations will be as agreed to by the client and the appropriate <br /> regulatory agency representative. The SJC/EHD will be notified at least 48 hours in advance <br /> of the sampling of the stockpiled soils in order to obtain concurrence with all sampling <br /> locations and depths. <br /> 3.5 Field Screening of Soil Samples <br /> Soil samples collected for laboratory analyses will be field screened for health and safety <br /> reasons. One brass sleeve will be used for field screening of samples. The material will be <br /> collected from the backhoe bucket. A brass liner will be pushed into the soils to minimize <br /> the potential for volatilization of volatile compounds. As earlier site work has documented <br /> that BTEX and gasoline are not present in significant concentrations, this methodology <br /> should result in representative samples being collected. A portion of the sample will be <br /> placed into a jar to fill it to approximately fifty percent capacity, shaken, and allowed to <br /> stand for approximately five minutes. A standard headspace reading will be collected using <br /> a Foxboro organic vapor analyzer (OVA) or equivalent field instrument. Results will be <br /> recorded on the field log. <br /> 3.6 Soil Analyses <br /> Soil samples will be analyzed for Total Petroleum Hydrocarbon (TPH) as gasoline and diesel <br /> and benzene, toluene, ethylbenzene and total xylenes (BTEX) using Methods modified 8015 <br /> and 8020. <br /> 5003J1 4 <br />