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W01 <br /> � <br /> M <br /> � 9� ,� uk�'�f•"'� �� ,a�— sr <br /> Mt <br /> .� � � �N r W 1 1� ;#{ r ,�. •°,r �� -� .,� i.. - <br /> F uwr <br /> G PROJECT. REGAL 60.3 <br /> 2-10-89 <br /> EPA method 8015 for TPH,EPA. methods 8020 and 602 for BTEX and EPA <br /> method 7420 for total lead. Results arc in micro grams/gram (uglg)which is <br /> ppm or in micro grams/liter (ug/L.)which is parts per billion(ppb). The <br /> lower detection limits ranges are as follows; <br /> TPH 10 to 1000 pp:n in soil <br /> 5 to 50 ppm in water <br /> BTEX 0.02 to 2 ppm:in soil <br /> 50 to 500 ppb in water <br /> Total lead 3.0 ppm for soil <br /> 0.5 ppm for water <br /> Note: Variations in the reported lower detection limits are a result of <br /> differ-nt dilution factors required for each individual sample. <br /> The TPH and BTEX concentrations for samples collected by WEGE can be <br /> found on Table 2 and are represented in ppm. All of Lie Organ`,--Lead,Total <br /> Lead and Ethylene Dibromide sample res!-.Its can be found on Table 3. <br /> 2_2 LOCAL GEOLOGY AND HYDROGEOLOGY <br /> The excavation created during tank removal revealed a relatively flat lying <br /> sequence of clay,clayey sandy silt,and silty sands to a depth of 22 feet <br /> below the surface. Exploratory borings performed on si::investigated the <br /> subsurface to 65 feet below the surface. These borings revealed a <br /> moderately sorted quartz sand Ices which was approximately five feet thick <br /> at 25 feet below the surface in the eastern half of the site. Another quartz <br /> sand lens that is approximately five fed thick is found to exist south of the <br /> excavation (Boring 3)at approximately 40 feet below the surface and seems <br /> to be localized to this area. Ground water was encountered in a more <br /> massive sand deposit at approximately fifty feet below the surface. This <br /> sand exisft to the 65 foot depth (see figures 9 and 10). <br /> Ground water was encountered in all of the borings at approximately fifty <br /> feet below the surface. The ground water depth was measured from the <br /> surface in the borings, and from the top of the casing in the monitor wells. <br /> Ground water flow directions were interpreted from the ground water <br /> gradient that was produced from measurements taken from tlw monitor <br /> wells. The local gradient follows what was described earner in.)anal <br /> Geology-and Hydrogeology in that it flows to the southeast,towards <br /> downtown Stocldon (see figures 7,8,and 9). <br /> 17.. <br />