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r <br /> Ms. Lori Duncan <br /> August 10, 2000 <br /> Page 3 of 4 <br /> the surface with a locking cap and water tight, traffic rated well box, or above ground steel well <br /> monument. <br /> Drilling and well installation will be conducted under the supervision of California Registered <br /> Geologist. The borings will be sampled at 5-foot intervals for soil classification and possible analytical <br /> testing. All soil samples will be classified in accordance with ASTM Designation D2488-90, which is <br /> equivalent to the Unified Soil Classification System. Up to three soil samples per boring, dependent <br /> upon field evidence of contamination and/or changes in lithology, will be submitted for laboratory <br /> analysis. Soil samples selected for analysis will be immediately capped, labeled and placed in an ice <br /> chest for transport to the laboratory. <br /> Soil samples selected for analysis will be submitted to a State-certified laboratory under chain of <br /> custody protocol. The samples will be analyzed for total petroleum hydrocarbons as gasoline (TPHg) <br /> using EPA Method 8015; and benzene, toluene, ethylbenzene, xylenes (BTEX), and methyl tert butyl <br /> ether (MTBE) using EPA method 8020. Any positive results for MTBE will be confirmed by re- <br /> analyzing the soil sample for oxygenated gasoline additives using EPA Method 8260. <br /> Drill cuttings will be placed on and covered with plastic sheeting or placed in DOT approved 55-gallon <br /> drums. Water generated from equipment decontamination will be contained in labeled DOT approved <br /> drums. The soil and/or drums will be stored on site pending laboratory results and the development of <br /> disposal options. <br /> Well Development, Surveying and Groundwater Sampling <br /> The elevation of the top of the casing in each well will be surveyed to an accuracy of 0.01 feet. A <br /> minimum of 24 hrs after completion, an experienced field technician will measure static depth to water <br /> and then develop the wells by pumping and surging until turbidity is minimized. A minimum of five <br /> casing volumes will be purged from each well. <br /> Groundwater samples will be collected after pH, temperature, and electrical conductivity have <br /> stabilized and the wells have recharged to minimum of 80% of static levels. Groundwater samples will <br /> be immediately placed in an iced cooler and submitted to a State-certified laboratory under chain of <br /> custody protocol for analysis of TPHg (EPA 8015m), BTEX (EPA 8020), and oxygenated gasoline <br /> additives(EPA 8260). The EPA 8260 scan will be expanded to include ethylene dibromide (EDB) and <br /> 1,2-dichloroethane(1,2-DCA) pursuant to Regional Board requirements. <br /> Water generated from well development and sampling will be contained in labeled DOT approved <br /> drums. The drums will be stored on site pending laboratory results and the development of disposal <br /> options. <br /> Reporting <br /> Following the receipt of analytical results, a technical report describing the methods and results of the <br /> investigation proposed herein will be submitted to PHS/EHD. The report will describe, to the degree <br /> possible, the nature and extent of contamination and will contain recommendations for additional work <br /> F:1Data1GROUNDZE1TuffBoy\Reports\WORKPLANMWS.doe <br />