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v [ <br /> STATS OF CALIFORNIA . GEORGE DEUKMEJIAN,Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD <br /> SACRAMENTO,CA 95827-3098 - rr+y� <br /> 24 April 1989 ! R 2 6 X89 <br /> ApNMENj VIGE�ZH <br /> Mr. David Bates EN PERM,, I SER <br /> Marley Cooling Tower Company <br /> 500 Foxridge Drive <br /> Mission, Kansas 66201 <br /> SURFACE IMPOUNDMENT CLOSURE PLANS AND SPECIFICATIONS, MARLEY <br /> COOLING TOWER COMPANY, STOCKTON, SAN JOAQUIN COUNTY <br /> We have reviewed the construction plans and specifications, <br /> including the Quality Assurance Plan (QAP) dated March 1989 for <br /> the closure of the surface impoundment. Overall, the plans and <br /> specifications appear to be sufficiently detailed to ensure the <br /> successful closure of the site. However, we do have some <br /> suggestions that you may wish to consider. These are as follows: <br /> 1. The proposed leachate collection and leak detection system is <br /> designed to cover/monitor the entire burial chamber. Closure <br /> requirements that will be issued by this Board will likely <br /> include contingency plans in the event liquids accumulate in <br /> the leachate collection system and/or the leak detection <br /> system during the post-closure period. In the unlikely event <br /> that significant quantities of contaminated liquids are <br /> detected within the leak detection system, the contingency <br /> plan will probably require an assessment of the liner leak <br /> that may result in the repair of the liner. <br /> It may be beneficial to redesign the burial chamber to provide <br /> separate leachate collection/leak detection systems for <br /> discrete portions of the chamber. The chamber could be <br /> divided into halfs or quadrants. Hence, if a significant leak <br /> in the liner occurs, then the general location of the leak can <br /> be ascertained. <br /> 2 . The proposed design positions the riser pipes within the <br /> interior of the burial chamber. The plans and specifications <br /> state that special pipe supports and waste placement and <br /> compaction procedures should be used in the vicinity of the <br /> riser pipes, however, no details are given. If interior riser <br /> pipes are used, then the special pipe supports and <br /> construction procedures should be specified. <br /> 3 . The installation of the interior riser pipes will be labor <br /> intensive. The inspector will have to closely observe the <br />