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06/26/96 12:24 FAX 916 920 8463 9112M HILL IQ002/002 <br /> STATE OF CALIFORNIA—ENVIRONMENTAL FR ION AGENCY PETE WILSON, Gaiev,,a, <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <br /> AR ROAD. 52117E A <br /> Sq � <br /> SACC RAMENTAMENT O. CA 958273098 bb ,rp <br /> PHONE; (916) 255-1000 <br /> FAX. (916) 255-3015 <br /> 23 May 1996 <br /> Mr. Jim Hartley IgInyx <br /> CH2M HillIIT <br /> 2485 Natomas Park Drive, Suite 600 <br /> Sacramento, CA 95833 JUN 2 5 1996 <br /> KOPPEL STOCKTON TERMINAL ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> Thank you for submitting the Work Plan for the Environmental Investigation at the Koppel <br /> Stockton Terminal on behalf of your clients, Munco, Cargill, and Chevron Chemical Company. I <br /> have reviewed the workplan, and find it to be well-written and through. The workplan is <br /> approved with the following comments: <br /> . The workplan states that groundwater from monitoring well KP-I will be considered <br /> representative of background quality. However, staff will not consider KP-1 to represent <br /> background conditions if it is downgradient of a source area (a disposal trench). <br /> . Before collecting additional water samples from KP-1 to characterize ambient background <br /> quality, I'd suggest that you take water elevation measurements to determine if KP-1 is really <br /> upgradient. If it turns out that KP-2 or KP-3 is upgradient, you'd want to take the additional <br /> samples from the appropriate well. <br /> . As we discussed, a bailer should be used to collect the volatile organics samples (EPA 8010 <br /> and 8020), while a low-flow pump can be used for the rest of the samples. <br /> . We also discussed the reasons for field filtering the water samples, and I'm not sure if this <br /> step is really necessary. You may wish to collect duplicate nitrate or ammonia samples, and <br /> field filter oruy one of them. This would show if there is any analytical difference, and if the <br /> cost of field filtering is justified in the future. <br /> Please keep me informed as to your schedule for field work, so that I meet you onsite to <br /> determine the location of monitoring well KP-1. I can be reached at (916) 255-3104. <br /> w vy") <br /> WENDY WYELS <br /> Ag Regulatory Unit <br /> cc: Ms. Leah Goldberg, McDonough, Holland & Allen, Oakland <br /> Ms. Annemarie Torrez, Chevron Corporation, San Francisco <br /> Ms. Karen Baril, Cargill, Minneapolis <br />