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DEPARTMENT OF THE ARMY <br /> SHARPE ARMY DEPOT $ <br /> �( "'NNNVVV111y LATHROP, CALIFORNIA 95331 <br /> Yvysr r{J <br /> LsREPLY TO <br /> ATTENTION OF APR 2 3 1n^a <br /> March 22, 1990 <br /> iII'ONMENTAL HE' <br /> Environmental Program OfficeE . <br /> liT/,�, RVI�t <br /> SUBJECT: Use of Well AG-12 for Emergency Water <br /> F( V E <br /> SANITARY ENGINEERING <br /> s�OU70M <br /> Mr. Larry Ed. Burgess, Sr. <br /> APP 101990 <br /> Modtech, Inc. <br /> Post Office Box 1240 <br /> Perris, California 92370 <br /> Dear Mr. Burgess: <br /> In a meeting on March 21 , 1990, the proposal by BMG2 to close wells AG-9 <br /> and AG-5 and use AG-12 for emergency use does not appear to pose any adverse <br /> impacts to the Remedial Investigation work underway at Sharpe Army Depot. <br /> AG-12 is about 900 feet from the edge of a TCE plume in the C-zone aquifer. <br /> Well cluster 510 is between the TCE plume and AG-12. Well number 510 is <br /> clean. Although continued use of AG-12 could accelerate the northwest <br /> migration of the plume, the two-hour pump test proposed by BMG2 should have <br /> little or no impact on plume migration. The high rate of pumpage proposed, <br /> 2,500 gallons per minute, is not a problem provided the pump test duration <br /> remains low. It is possible that AG-12 will not produce 2,500 gallons per <br /> minute. BMG2 might then propose to use AG-5 or AG-9. Both these wells are <br /> very close to TCE plumes and should not be used. Sharpe Army Depot will not <br /> oppose the BMG2 proposal . However, Sharpe Army Depot should make it clear <br /> that use of AG-5 or AG-9 could cause serious problems and must be closed. <br /> This proposal has been discussed with the technical staff at U.S. Army <br /> Toxic and Hazardous Materials Agency. <br /> If you have any questions, please contact me. at (209) 982-2097. <br /> Sincerely, <br /> i <br /> Rbe] W. Haines, P.E. <br /> Environmental Program Manager <br />