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�S <br /> Van Den Bergh Foods :N ' <br /> 1400 Waterloo Road, Stockton <br /> Site Code: 22073 r <br /> Meeting Notes <br /> (Continued) <br /> R <br /> i <br /> M: (reviews Porter-Cologne & directive to protect groundwater.) You must remediate any <br /> potential threat to groundwater, and groundwater. This does!not mean cleanup to ND, but <br /> requires removing most contamination in the soil zone, andl?all contamination below the <br /> highest recorded site water level. <br /> F: What is the soil cleanup level ? <br /> M: There's no single number. Models often are used to!Idevelop numbers. Central Valley <br /> T RWQCB has a rough, very conservative-guideline they sometimes use For soil, it is-10 <br /> times the drinking water MCL. If that is unachievable them closure is granted. <br /> D: Is there an MCL for TPHd ? <br /> M: Yes. The secondary California MCL for TPHd is Taste and Odor Nuisance, and is 100 <br /> ppb. <br /> rE <br /> i' <br /> F: Have you worked on other sites with diesel problems"'at sudIh great depth ? <br /> M: No. Your consultant needs to determine the depth! and degree of cleanup required. <br /> Bioventing may work. <br /> L: The depth of the lower diesel, tightness of the soils, and high moisture content because <br /> of the water table elevation will make bioventing difficult: Can we consider natural <br /> attenuation in soil and groundwater as one of the alternatives ? <br /> M: Frank, "natural attenuation" isn't the low-cost panaceathat some consultants say it is. It <br /> t <br /> l requires, among other things, years of monitoring. The long' term costs often exceed the <br /> j short-term cost savings. <br /> D: Mary, we know that. Assuming that we address the.true +c st of monitoring, etc, with <br /> natural attenuation, can we use it as an alternative ? <br /> (Discussion of ideas. Magnesium Peroxide socks discussed for water. Mary says RWQCB <br /> favors them. Suggestion made to pressurize the deeper wells, to cause air to enter formation and <br /> help biodegradation.) <br /> M: Please follow guidance in preparing feasibility study (FS) work plan and CAP. You may <br /> incorporate the FS work plan into the next QMR, which I will expect on 1/15/96. <br /> Please review SWRCB Policies and Procedures 92-49 and 88,-16 and UST regs (Title 23, <br /> chapter 16) in preparing plans. '' <br /> MZ/11-10-951VDBF/95-0041 3 ;� <br />