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2013 Semiannual Groundwater Monitoring and Evaluation Report <br /> Full-Scale In Situ Hexavalent Chromium Reduction Treatment Implementation <br /> Former Marley Cooling Tower Site,Stockton,California August 2013 <br /> well MW-211 are potentially anomalous; Dudek is investigating the reason for higher water level <br /> measurements at this location. The average linear velocity of groundwater in the Intermediate <br /> Zone was estimated using: <br /> • A hydraulic conductivity of 85.3 ft/day, which was averaged from hydraulic <br /> conductivities estimated from aquifer tests conducted at wells I-7, I-8, MW-211, <br /> MW-320, and MW-212 (H+A, 1989a and 1989b) <br /> • An effective porosity of 7 percent(H+A, 1990) <br /> • The hydraulic gradient calculated between wells MW-211 and MW-322 <br /> The average linear velocity of groundwater in the Intermediate Zone across the source area was <br /> approximately 0.37 ft/day in January 2013 and 0.44 ft/day in April 2013. <br /> (a MWH,, <br /> 3-6 <br />