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,Re <br /> / • iF.OE A4.PK` * <br /> �ONIf!//QIBGLCP ly?7 <br /> July 27, 1990 <br /> Mr. Greg K. Vaughn y <br /> Senior Engineer, TPCA Unit AUG 4 <br /> California RWQCB <br /> ENV IRON MEix, 1 Ai. rit rNLl ti <br /> Central Valley Region <br /> 3443 Routier Road PERM IT/SER-i i�E-S <br /> Sacramento, CA 95827-3098 <br /> Re: Surface Impoundment Closure <br /> Overhead/Lodi Door Company <br /> Lodi , California <br /> Dear Mr. Vaughn: <br /> This letter is my response to your request that we address your concerns <br /> about the adequacy of a pump test that was conducted at the above site <br /> on March 26, 1990. <br /> The pump test was conducted by Remedial Services, Inc. , Pleasanton, <br /> California and the results were interpreted by Mr. David C. Glick, a <br /> registered engineering geologist who works for BSK & Associates, in <br /> Pleasanton, California. I have recently received input from Mr. Glick <br /> concerning your expressed concerns, and I have reviewed applicable parts <br /> of J. H. Kleinfelder's original Hydrogeological Assessment Report (HAR) <br /> dated November 9, 1987. With input from these two sources, I have <br /> addressed your concerns below: <br /> Concern #1 <br /> The well was pumped at a rate of ten gallons per minute. The flow-rate <br /> may not have been large enough to stress the aquifer. How did RSI <br /> choose the flow-rate? Did they perform a step-drawdown test prior to <br /> the pumping test? <br /> Answer #1 <br /> The pump test was performed on monitoring well #6, which was installed <br /> by BSK during December, 1988. BSK's report on the well installation <br /> indicates that the well was developed by pumping at a rate of 10 gallons <br /> per minute. It was further noted that, "The water level in well #6 <br /> decreased rapidly from 49.73 feet when the pump was turned on and <br /> appeared to stabilize at 76.65 feet after 20 minutes of pumping" . A <br /> step-drawdown test was not performed prior to the pumping test, but BSK <br /> believed that a 17 foot drawdown would be more than adequate to <br /> determine whether or not a monitoring well 10 feet away would be <br /> affected. <br /> Overhead Door Corporation 6750 LB]Freeway 75240 P.O.Box809046 Dallas,Texas 75380-9046 214-233-6611 Fax214-233-0367 <br />