WORK PLANS CASE 2 - Laserfiche WebLink

Home Browse Search

k`■ KLEINFELDER located at the Sharpe Army Depot cannot be discounted. Groundwater flow direction has been shown to fluctuate at the northern portion of the site, and even split into two directions in the McKinley Avenue recharge area. The dominant flow direction over the majority of the site has been shown to be flowing onto the northern portion and McKinley Avenue area from the west. Kleinfelder's initial location of an upgradient monitoring well was at the McKinley Avenues recharge areas western boundary in a limited area that has not historically had process water applied to it. Further evaluation of the groundwater flow in the area of the McKinley Avenue recharge area shows mounding of the entire area at times. In those instances, there would be no upgradient well placements available. Considering the limited nature of coverage that the placement of the proposed monitoring well would afford and the limitations created by the railroad easements, Kleinfelder recommends that the upgradient monitoring well for the McKinley Avenue recharge area either be placed west of the Union Pacific Railroad tracks along 7th Street approximately 300 feet west of the application area or in the McKinley Avenue easement east of W-4. Please see the attached proposed monitoring well location map with the optional monitoring well locations. Kleinfelder recommends that the Louise Avenue monitoring well location not be installed at this time as proposed in the workplan because the extent and location of the proposed application waters has not been established yet. Monitoring well L-1 is centrally located at the proposed Louise Avenues area's eastern boundary and essentially upgradient of the proposed application area. Kleinfelder's initial proposed additional monitoring well was next to L-1, which we felt was technically unsound to have two monitoring wells just feet apart. If kept properly clear of application waters the existing well would serve as an appropriate upgradient monitoring point to the area because no application water has been applied to the site yet. It is Kleinfelder's recommendation to CNP that no application water be applied to the area near L-1, and the area with an approximately 50 foot radius west of L-1 be bermed in an attempt to keep runoff from flowing toward L-1 and that L-1 be utilized as the background well. Item No. 3 If conditions in the borehole allow, it is recommended that the sand pack be surged prior to installing the bentonite seal consistent with SJCEHD Well Standards Section 13.10.8. Like our previous installations of the site, if conditions allow in the borehole the sand pack will be surged to settle the pack prior to the installation of the bentonite seal in accordance with the SJCEHD Well Standards 13.10.8 recommendation. Item No. 4 The workplan states groundwater samples will be analyzed in accordance with the current Monitoring and Reporting Program requirements; collection of samples for trihalomethanes analysis is also required on an annual basis in the first quarter. C20-4587-O1.MNl /ST021,200 Page 3 of 4 Copyright 2002,Kleinfelder,Inc. September 20,2002