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S'PYUE OF CALIFORNIA Aga GEORGE DEUKMEJIAN.Governor <br /> CALIFORNIA REGIONAL WATT QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD <br /> SACRAMENTO,CA 95827-3098 <br /> 25 May 1988 MPS 2b ���tN <br /> James <br /> Harvey <br /> Safety andPollution Control Officer �NVQ(`RMjNf �cR�\G <br /> Dallas Corporation <br /> 6750 L&7 Freeway <br /> Dallas, TX 75240 <br /> REVIEW OF HAR FOR OVERHEAD/LODI DOOR CO. , SAN JOAQUIN CO. , <br /> TPCA # 05114 <br /> Enclosed are our comments on the Hydrogeological Assessment <br /> Rerort (HAR) for the Dallas Corporation, dba, Overhead/Lodi Door <br /> Co. (O/LDC) surface impoundment. <br /> Much of the work necessary to satisfy HAR requirements in Section. <br /> 25208. 8 of the California Health and Safety Code has been <br /> completed. The comments in the attached memorandum must be <br /> addressed, and additional work performed to complete the HAR, <br /> including but not limited to the following: <br /> 1. Obtain valid analytical results for major ionic constituents <br /> from all wells. <br /> 2. Investigate the entire vertical extent of the upper aquifer. <br /> 3 . Determine the nature of interconnection between the <br /> uppermost water-bearing zone and deeper aquifers. <br /> 4 . If a lack of interconnection cannot be adequately <br /> demonstrated, investigate the effect of the impoundment on <br /> deeper water-bearing zones. <br /> 5. Install additional wells to more accurately monitor down- <br /> gradient water quality. <br /> 6. Determine the magnitude of vertical gradients in the <br /> uppermost water bearing zone. <br /> 7 . Obtain accurate estimates of aquifer properties by <br /> performing aquifer hydraulic tests. <br /> In addition to the work necessary to complete the HAR, the <br /> lateral and vertical extent of ground water ;which has been <br /> affected by leachate migration must be investigated, and <br /> remediation alternatives assessed. It would be advantageous to <br /> coordinate these two goals. <br />