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STATE OF CALIFORNIA - Environmental PrcJ&�n Agency _ _ • PETE WILSON, Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION <br /> 3443 Routier Road, Suite A p <br /> Sacramento, CA 95827-3098 ' <br /> PHONE: (916) 255-3000 <br /> FAX: (916) 255-3015 <br /> 22 January 1997 <br /> Mr. Joe Ramage <br /> IT Corporation <br /> 3634 BacksoaWr StreetS�- <br /> Math CA 95655-4108 <br /> REV EW OF DRAFT WORKPLAN: CAL FARM SUPPLY <br /> Thank you for submitting the Proposal - Environmental Corrective Action Services for the Cal Farm <br /> Supply facility on W. Washington Street, Stockton. As we discussed earlier, the Board considers <br /> this proposal to be a draft workplan. I have reviewed this document; my comments are as follows: <br /> Scone of Work <br /> The facility is next to, not within, the Port of Stockton. <br /> Geoprobe Groundwater Survey <br /> 1. The Board is overseeing groundwater investigations at two sites adjacent to Cal Farm Supply <br /> (Koppel Stockton Terminal and Cargill Feed Facility). Because of questions as to which site(s) is <br /> responsible for the nitrates found in the groundwater, I think it's very important that sampling be <br /> coordinated between all three sites. During the geoprobe survey, I'd like to have Cal Farm's wells <br /> sampled and the groundwater gradient determined, and if at all possible, the wells at Koppel and <br /> Cargill also sampled and gradient measured. Koppel will be conducting water level measurements <br /> in March and April, and water quality measurements in May. Cargill will be sampling in March. <br /> If it's not possible to mesh the schedules of all three sites, then the Board may be able perform <br /> some of the work/analysis. <br /> 2. The location of the deeper boring should be identified. The boring should be advanced into the <br /> next lower water-bearing zone. <br /> 3. I'm not sure if any of the soil samples need to be analyzed for pesticides or herbicides. Prior <br /> analytical data should be reviewed. It may be possible to decrease the soil analysis and increase the <br /> number of hydropunch samples. <br /> 4. The analytical program should be more specific: the geoprobe location should be matched to the <br /> analytical methods. <br /> Monitoring Well Installation <br /> 1. At least one well should be downgradient of the plume. <br /> 2. The new wells should be constructed in a similar manner to the existing wells. <br />