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state of California Department of Health Services <br /> Memorandum <br /> James L. Tjosvold, 19 August 1988 <br /> TO Senior Waste Management Engineer Date <br /> 2041 Navy Dr. <br /> Subject: Workplan <br /> From Lee Taubeneck <br /> Associate Waste Management Engineer <br /> I have reviewed the Workplan for the installation of two <br /> additional wells at the subject facility. The wells will be <br /> installed by the dual-tube percussion method of drilling. <br /> This method will effectively seal off shallow groundwater- <br /> bearing zones from deeper groundwater bearing zones. <br /> The two wells will be paired with existing wells screened at <br /> more shallow intervals . Over time, this will allow for an <br /> analysis of the vertical groundwater flow component. One <br /> well will be sited downgradient of the sources of <br /> groundwater contamination (south etching room, western <br /> sidewalk, and chemical storage yard sump) , and one well will <br /> be sited upgradient. <br /> To allow for better groundwater quality samples a <br /> gradational analysis will be performed prior to determining <br /> the screen size and filterpack material . Soils will be <br /> classified at depths greater than 30 ' (bgs) . Soil samples <br /> will also be collected for sieve analysis below this depth. <br /> The monitoring portion of the workplan is specified as <br /> agreed to in the Conference Call of 7 July (cf. staff letter <br /> to Christopher Vais dated 21 July) . There is however past <br /> evidence of shallow groundwater contamination by nickel and <br /> copper. These analytes should be added to the list of <br /> chemicals to be screened in the first round of "deep" <br /> groundwater sampling. <br /> Recommendation <br /> The Task I portion of the workplan appears sound. Task II <br /> should be modified to include the two additional analytes <br /> nickel and copper. <br />