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Ms. Vicki McCartney Project No.: 88O.O4O.1A.O11O <br /> May 23, 2003 <br /> Page 7 <br /> the CPT hole). Groundwater samples will be collected by pushing the groundwater <br /> sampling device to the desired depth. The sampler will be pulled back approximately <br /> two feet, exposing the temporary well to the water-bearing zone. A groundwater sample <br /> i <br /> will then be collected using a 0.5-inch diameter bailer. Groundwater samples will be <br /> transferred from the bailer into the appropriate laboratory-supplied containers, labeled, <br /> and transferred directly to a State-certified laboratory for analysis. <br /> After the sample is collected, the probe will be removed from the borehole. The probe <br /> casing, probe tips, screen, and bailers will be decontaminated by steam cleaning or triple <br /> washing (Alconox rinse, deionized water) between each sample. Subsequent <br /> pushes will be made through the existing borehole and will continue to the bottom of <br /> successively deeper water-bearing zones. <br /> i <br /> Following the last sample, either an expendable Hydropunch° (or equivalent system) tip <br /> will be ejected and the hole grouted with bentonite slurry, from the bottom up, during <br /> removal of the probe casing. Alternatively, the casing will be removed, and a temporary <br /> polyvinyl chloride tremmie pipe will be inserted to the total depth, and the hole will be <br /> grouted with bentonite slurry from the bottom of the hole to the surface- 6w- <br /> Groundwater <br /> wGroundwater Analyses <br /> Groundwater samples will be submitted to a California State-certified Hazardous <br /> Material Testing Laboratory-for chemical analysis for the'following: <br /> i <br /> ➢ Total Petroleum Hydrocarbons as gasoline by U. S. Environmental <br /> Protection Agency (EPA) Method 8015 <br /> ➢ Benzene, toluene, ethylbenzene, and xylene by EPA Method 8260 <br /> ➢ Five fuel oxygenates, 1,2-dicloroethane, and ethylene dibromide by EPA <br /> Method 826OB <br /> Data Analysis and Reporting <br /> At the conclusion of the CPT/Hydropunch® investigation, a report will be prepared that <br /> . i <br /> documents the results. CPT profiles and boring log information will be evaluated and <br /> i <br /> compared to existing stratigraphic and hydrogeologic information to refine the <br /> i <br /> SHAW ENVIRONMENTAL,INC. <br /> NAsacDP\2003\Prj\880\8800401 A.3 ac.doc <br /> i <br />