SITE INFORMATION AND CORRESPONDENCE_1988-1991

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Sharpe Depot - CLEANUP cleanup cuts Continued from B-t 275parts per,billion in 1987 down contacoy�+ny.�.�'natioy� y r, to 225 parts per billion last mination year, said John Guzman, an envi- ronmental engineer at the depot .,,,The: TICE levels are measured a By Art Lozano .rhe water enters the treatmen The Stockton Record ;plant from all of the extractio "wells. Blowing air through contaminated The state's acceptable level o groundwater appears to be working in TCE in drinking water is five part Sharpe Army Depot's ongoing effort to per billion, but the federal Envi remove a suspected carcinogen., ^tronmental Protection Ageny, th „ state Health Services Departmen Since 1987, an air-stripping water ..and state Regional Water Quali treatment plant on the southern end of "Control Board require the,depo the depot has been pumping water From remove all traces of the chemica before the water is released int 15 extraction wells that range in depth ` from 30 to 270 feet. The water then has -the San Joaquin River. been running through what seems to be the last report, they ( Yrtonitoring agencies)though[that a relatively simple process. TGE levels were decreasing," said i Jack Haines, the depot's environ- Water is allowed to flow down a 25 mental program manager. fool cylindrical rocket-like apparatus The relatively simple proce- while air is pumped upward through the —dut a is costly. The Army has water. The process appears effective innt $13 million since the dis- removing Irichloroethyial in tests of con- o"very of TCE in the groundwater taminated water that ran as high as 1,000w fh 1980.1t expects to spend a total i parts per billion in some areas.The aver- i 'of$35.4 million through 1997 by t age figure has declined from 250 to ' !:doubling its cleanup effort,with f Sae CLEANUP,B-3 F.,�-tkie opening of another water 1.t'1'eiitment plant in the northern Mart of the depot in October.