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long axis of the tank will be drilled at both ends of the e tank. Two soil samples will be <br /> collected.from each borehole. One sample will be collected midway between the top and <br /> bottom of the tan^e other sample will be collected approximately to Ifeet:below the <br /> bottom of the tank.:: 1 5 c +11_1�- �,-I- b04�int I'e_ f , <br /> k" <br /> The'�e dW`ar►ditt6liued boreholes will be drilled with a skid mounted Mobile B-N drill rig <br /> .using hollow stem:augers to commencing initial drilling operations, and subsequent <br /> to drilling additional boreholes, the drill rig, tools, hollow stem augers and any other <br /> downhole tools or equipment, thoxoughly:steam'cleane&-to.-prevent borehole.cross <br /> eont , 44on." ae wafter will be collected and stored onsite. All drill cuttings will be <br /> collected,and stored onsite. A sample of the rinsate water, and a composite sample of the <br /> drill cuttings, X911ected and analyzed for the same chemical constituents as the soil , <br /> samples...°Oollecterh; Final disposition of the rinsate waters and drill cuttings will be <br /> dependent on the.ehep yses conducted; either transport and disposal as hazardous <br /> t. <br /> W Xspo5a1 die`r :fiats'waters into tfie storm drain system, and using the drill <br /> cuttings to backfiili.,:the excavation at Tank A. Should the rinsate and drill cuttings be <br /> determined to be hazardous wastes, The accumulated rinsate and drill cuttings will be <br /> transported by a State of California licensed hazardous waste hauler (AEMC) under <br /> hazardous waste manifest to a TSD facility for disposal. <br /> Soil samples will be collected using a thin walled Shelby Tube fitted with an internal brass <br /> liner. Soil samples will be collected in advance of the auger drill bit at the head of the <br /> hollow stem auger string. When the desired depth is reached, the Shelby Tube will be fitted <br /> with an internal brass liner and attached to the end of a string of drill pipe. The assembly <br /> will then be lowered through the hollow stem auger string. The Shelby Tube will then be <br /> pushed hydraulically in advance of the auger bit. The Shelby Tube will be advanced <br /> sufficiently so as to completely fill the brass liner with soil, and allow no headspace"in the <br /> brass liner. The Shelby Tube will then be retrieved hydraulically. Following retrieval, the <br /> sample filled brass liner will be removed from the Shelby Tube. Both ends of the brass <br /> liner will be covered with aluminum foil, securely capped with polyethylene end caps, the <br /> end caps taped with silver duct tape, labeled, and placed in an ice chest containing dry ice <br /> and kept frozen for transport to the analytical laboratory for chemical analyses, <br /> rl` 2) Page S <br /> r��=,y'Jr'.qtr.'°s�.>F'je�'s�lit.i.�'�s�►t�:�t.aator - - <br />