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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. Samples <br /> will be analyzed for TPH as gasoline and diesel and BTEX using modified 3044-and 8020, <br /> respectively. 3o l-s <br /> 3.4 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 ajar 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 /> 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. <br /> 3.5 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, respectively. <br /> 4.0 QUALITY ASSURANCE PLAN <br /> The following sections describe field and analytical quality assurance procedures to be <br /> followed during this investigation. <br /> 4.1 Sample Collection and Handling Protocol <br /> Proper sampling and handling are essential to assure the quality of the data obtained from a <br /> sample. Each sample will be collected in a brass tube, preserved correctly for the intended <br /> analysis, and stored for no longer than the permissible holding time prior to extraction and/or <br /> analysis. <br /> 500311 4 <br />