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------------------- <br /> .Site C'haracrerization and Sar. _mediation Plan: 7300 iFest Eleventh Street, Tract, Page 13 <br /> Fr.•. <br /> laboratory certified to perform the specified analyses by the California <br /> :. •f}l <br /> Environmental Protection Agency (Cal-EPA), where they will be held in cold <br /> storage. (Nate: It is anticipated that all soil and groundwater samples covered <br /> by this Work Pian will be analyzed by Chromalab, Inc.'s [Chromalab] <br /> laboratory in Pleasanton, California, which is so certified.) Each sample that <br /> the engineer directs to be analyzed will be analyzed for the following-. <br /> Analyte Method of Analysis <br /> Total Petroleum Hydrocarbons EPA Method 5030/8015 <br /> (quantified as Diesel) <br /> Total Petroleum Hydrocarbons EPA Method 8020A/8015 <br /> (quantified as Gasoline) <br /> Benzene EPA Method 8020 <br /> Toluene EPA Method 8020 <br /> Ethyl benzene EPA Method 8020 <br /> Total Xylene Isomers EPA Method 8020 <br /> At exploration points where a groundwater sample is obtained via a hydro- <br /> punch, the water pumped from the probe will be directed into clean, <br /> laboratory-supplied glassware until the vessels are completely full. The sample <br /> ;J containers will then be labeled for identification, placed on chemical ice, and <br /> in a similar fashion to the core soil samples, transported to Chromalab within <br /> 24 hours for analysis <br /> 1 <br /> -' Selecting Locations for Groundwater-quality Monitoring Wells <br /> When all of the field and laboratory data from the initial phases of the <br /> `-� investigation have been compiled and evaluated, and a hydrostratigraphic and <br /> geochemical model of the subsurface has been developed, they will be used to <br /> select the optimal locations for installation of groundwater-quality monitoring <br /> wells. Figure 10 shows tentative locations for a total of eight such wells. <br /> Again, the symbology used on the figure indicates that the well locations <br /> shown are tentative. The actual number and locations of wells will be <br /> determined based on a synthesis of all of the information available at that stage <br /> of the site characterization program. However, general geotechnical <br /> engineering and hydrogeological principles have been used to select the <br /> tentative well locations shown on Figure 10: <br /> ❑ Monitoring well MW-1 is intended as an up-gradient <br /> groundwater-quality monitoring well, based on the general <br /> sic <br />