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1 <br />' the cost to the responsible party low. If clay beds are <br /> found, which might be aquicludes (barriers to vertical water <br /> migration and presumably hydrocarbons) , then additional <br /> sampling might be warranted just below the potential <br /> "capping" bed. <br />' The monitor wells are located in a manner that places two <br /> wells in a "down dip" water table location, at distances <br /> that will permit an accurate water table slope determin- <br /> ation. Past sampling showed that contamination had reached <br /> at least -29 ' bgl , only 18 ' above the 1986 water table at <br /> the site location. <br />' PROGRAM <br /> All equipment used must be brought to the site in a clean, <br />' steam cleaned condition. Any equipment used more than once <br /> must be either steam cleaned or washed at the drill site in <br /> a TSP or similar solution and double rinsed before using a <br />' second time. <br /> Bore and sample three monitor wells as noted above using a <br /> hollow auger rig and sample using a 2" X 18" or 24" spilt <br /> spoon sampler. ' 'to be bored using a nominal 10" OD <br /> flight size, to about 90 ' bgl , about 13 ' into the <br /> water table . WeAjms„v2Wandw34ware to be bored using an 8" OD, <br /> 4 9EF"Now"N ,®maip,Pr%poK-m"eA%yaw6he acme—de"pbh. <br /> Samples will be taken as noted above, using a California <br />' type, split spoon sampler with an 18" to 24" long <br /> collection chamber, holding 2" X 3" or 4" brass collection <br /> tubes . <br />' All samples will be collected and described by a registered <br /> geologist. Sterile brass tubes and water sample bottles <br />' supplied by a certified California laboratory will be used. <br /> The brass samples chosen by the collector will be capped <br /> with either foil or Teflon, capped with an end cover, sealed <br /> with duct tape, labeled and placed in an ice chest until <br /> taken to the laboratory. Chain-of-Custody forms will be <br /> used. The EHD will be informed prior to any field work being <br /> - done . <br />' After the holes are bored, screw type, interior flush <br /> _PVC pipe will be inserted into hole MW 1 ndO"D, 3 crew <br /> type, interior flush PVC pipe inserted into 2 an l <br />' rffi),_��(see Fig. 10) . The wells will then be gravel-packed, p <br /> cemented and completed as shown In general , �S o� <br /> O�►perrforated pi *ew*11bb u+s'ed w t�h a�bou a 10' pane �r titin erhe hole will be gravel packed with <br /> the perforated well casing and gravel extt3e~n`ding ;r o� <br /> above the top o 'thewate"rtabi e . The grave 1 wa 1 be capped <br /> with about 3 ' of bentonite clay and hydrated. Concrete will <br />,' 4 <br />