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STATE OF CALIFORNIA — ENVIRONMENTAL PR JTION AGENCY '�► PETE WILSON, Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION � <br /> 3443 ROUTIER ROAD, SUITE A <br /> SACRAMENTO, CA 95827.3098 0+ <br /> Fq DU.L(M <br /> PHONE: (916) 255-3000 <br /> FAX: (916) 255-3015 <br /> RSI26 January 1993 l� <br /> JAN 2 9 1993 <br /> ENVIRONMENTAL HEALTH <br /> I ERMIfi/�Oftta <br /> Mr. Nathan Esformes <br /> Triple E Produce Corporation <br /> P.O. Box 239 <br /> Tracy, CA 9537E <br /> GROUND WATER REMEDIATION PLAN, TRIPLE E PRODUCE, TRACY, SAN JOAQUIN COUNTY <br /> I have reviewed the 20 November 1992 report entitled "Transmittal of Ground <br /> Water Remediation Plan, " submitted by Weston for the Triple E Produce facility <br /> at 8690 West Linne Road in Tracy. The proposed remediation plan will help <br /> control the source of the highest concentrations of chloroform, but will not <br /> capture all the known ground water contamination. <br /> Ground water contamination is known to exist at least as far to the northwest <br /> as MW-7. The chloroform levels in this well (8.7 and 9.2 ug/1 ) exceed the 4.5 <br /> ug/l which you agreed in your 3 April 1991 letter is a reasonable cleanup <br /> goal . The proposal to extract ground water only from MW-4A will not capture <br /> this contamination, or any contamination beyond this. Even the combined <br /> pumping from MW-6 and MW-4A will not capture the contamination in MW-7. <br /> As stated in my 28 January 1992 letter, contaminant boundaries are defined by <br /> nondetectable levels of contaminants. The chloroform levels in MW-7 show that <br /> the northern extent of the chloroform contamination has not been determined. <br /> Additional monitoring well (s) are needed to further determine the lateral <br /> extent of the contamination. <br /> In addition, the results of the ground water model are questionable. The <br /> model indicates an 800-foot capture zone pumping at a constant rate of 15 <br /> gallons per minute (gpm) , yet the aquifer test in which constant rate pumping <br /> at 15 gpm reaches steady state in 47 hours did not produce any observed effect <br /> in MW-2, only about 450 feet away. <br /> The proposal to use the existing treatment system at the plant is acceptable <br /> if the capacity of that system is not exceeded. Once a system is proposed to <br /> capture all of the ground water contamination, the treatment system' s capacity <br /> will likely need to be increased to meet the needs of the expanded ground <br /> water extraction system. <br /> Additional investigation/remediation needs include determining the lateral <br /> extent of the contamination and proposing an extraction system which will <br /> capture all the contamination and a corresponding treatment system with a <br />