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STATE OF CALIFORNIA-Environmental Protecglhg0ency PETE WILSON Governor <br /> CALIFOR}VIA REGIONAL WATER QUAL CONTROL BOARD <br /> CENTRAL VALLEY REGION <br /> 3443 Routier Road, Suite A <br /> Sacrarnwto, CA 95827.3098 <br /> PHONE: (916)255-3000 <br /> DOD FAX: (916)255-3052 <br /> lA7a ,aa <br /> n, ry <br /> 2 December 1992 <br /> DEC 1®® <br /> Mr. Marshall Cloud <br /> R! IrlotVJr Alz <br /> 5:9lTry <br /> Environmental Protection Office <br /> Bldg. S-108, Sharpe Site <br /> Defense Distribution Region West <br /> P. 0. Box 960001 <br /> Stockton, CA 95296-0710 <br /> WELL SAMPLE RESULTS FOR TURBIDITY, DEFENSE DISTRIBUTION REGION WEST (DORN), <br /> TRACY, SAN JOAQUIN COUNTY <br /> Elevated metals concentrations have been found in some of the ground water <br /> samples at the DDRW, Tracy site. The issue of whether these elevated <br /> concentrations are due to turbidity, or whether these concentrations represent <br /> metals ground water contamination, has not been resolved. In an attempt to <br /> provide an independent resolution of this issue, the Regional Board collected <br /> and analyzed ground water samples from five well pairs. In the 14 to 15 <br /> October 1992 Project Manager's Meeting, we stated that we would send out the <br /> available laboratory results of ground water samples collected by the Regional <br /> Board prior to the 10 December 1992 meeting on the well monitoring program. <br /> The Regional Board collected samples from the following well pairs: <br /> Well Pair Number Wells <br /> 1 LM-1, LM-75 <br /> 2 LM-2, LM-61 <br /> 3 LM-25, LM-85 <br /> 4 LM-28, LM-62 <br /> 5 LM-32, LM-58 <br /> These well pairs were selected because the wells are screened in the same <br /> horizon and monitor the same waste management unit or area and because the <br /> pair consists of an older and newer well . The ground water samples were <br /> analyzed for the total and dissolved metals, standard minerals, turbidity and <br /> suspended solids. The following metals were included in the analyses: <br /> aluminum, arsenic, barium, boron, chromium, cobalt, copper, lead, manganese, <br /> mercury, nickel and vanadium. <br /> We have enclosed copies of all available analytical results for these well <br /> pairs. We have not yet received the analytical results for samples from other <br /> wells. If these data are available by the 10 December 1992 Project Manager's <br /> Meeting, we will provide copies of the analytical results at that time. <br />