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Mr. Gary J. Schnettgoecke <br /> Page 2 <br /> October 3 , 1989 <br /> practices used on the actual clay barrier layer. <br /> However, use of both methods is noted only during <br /> discussion of the actual clay barrier layer <br /> construction (reference page 2 of the cover letter) . <br /> Both testing procedures shall be performed on both <br /> the test clay barrier layer and the actual clay <br /> barrier layer. <br /> B. In regard to laboratory certification, it may be <br /> beneficial to modify the last sentence to read: The <br /> laboratory shall be certified in California and <br /> provide verification of equipment calibration. <br /> C. Provisions shall be made for Department personnel to <br /> witness the laboratory testing, perhaps by adding: <br /> The Contractor shall arrange authorization for DHS <br /> representatives to observe laboratory permeability <br /> testing. <br /> If you have any questions regarding the above, please contact <br /> Duane A. Gelster, at (916) 739-3145. <br /> Sincerely, <br /> Charles A. White, P.E. <br /> Chief, Permitting Unit <br /> Region 1 <br /> cc: Mr. David Bates <br /> Marley Cooling Tower Company <br /> 5800 Foxridge Drive <br /> Mission, KS 66202 <br /> Mr. Gary Reents <br /> Central Valley Regional Water <br /> Quality Control Board <br /> 3443 Routier Road <br /> Sacramento, CA 95827-3098 <br />