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between the two extraction wells. Extraction well EU-4 would continue to operate at 30 <br /> gpm during the shutdown of well EU-3. <br /> Using the numeric groundwater flow model developed for the site, Figure 4 is a plot of <br /> the predicted area of hydraulic capture under conditions of groundwater extraction from <br /> EU-4 at (30) gpm, and with well EU-3 turned off. <br /> Additional water level monitoring and groundwater sampling will be conducted during <br /> this period to assess the impact of the temporary shutdown of well EU-3. Groundwater <br /> samples will be collected from treatment system influent and nearby monitoring wells <br /> (including new monitoring well M-50A, located directly downgradient of EU-3) and <br /> analyzed for TCE and its daughter products on a weekly basis. Drawdown <br /> measurements in nearby monitoring wells, and sampling for TCE and TCE daughter <br /> products collected during the test, will be assessed and discussed with the RWQCB <br /> after 30 days of modified system operation. If it is agreed that the data collected thus far <br /> do not suggest the existence of a stagnation zone between the two wells, the test will be <br /> terminated early and pumping rates at well EU-3 and EU-4 returned to rates of 30 gpm <br /> each. <br /> We appreciate your review and response to this proposed change in the operation of the <br /> Industrial Ave. (TRAP) groundwater extraction system. ECM will contact RWQCB <br /> following your receipt of this letter to discuss implementing this proposed temporary <br /> change in system operation. Please do not hesitate to contact Brent Searcy (415-282- <br /> 1979) or Binayak Acharya (661-255-1693) with any questions or concerns. <br /> Best regards, <br /> Brent Searcy,, P.E. Binayak Acharya <br /> CC: Mike Desso, NUSA <br /> Distribution List <br /> 3 <br />