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Mr. Mike Desso • . 14 November 2006 <br /> i <br /> Regional Water Board Comments on the Final Work Plan <br /> Regional Water Board staff has follow-up comments regarding Nestle's response to Items 9 <br /> and 10 of our 3 October 2006 review letter. <br /> 9) Nestle has decided to increase the frequency of monitoring and sampling of well M- <br /> 23D to quarterly, but has decided not to increase the frequency for well M-21 D. <br /> However, Nestle should implement quarterly monitoring of M-21 D soon because the <br /> leading edge of the VOC plume emanating from the Industrial Avenue source area <br /> appears to have reached this well; concentrations of cis-1,2-DCE in 2006 have been <br /> detected in M-21 D and in Ripon supply well MW-11, which is located near M-21 D. <br /> So far, these concentrations have been below the California Health Services <br /> maximum contaminant level and the Office of Environmental Health Hazard <br /> Assessment Public Health Goal. <br /> 10) Nestle has decided to monitor Fox River wells down-gradient of Ripon municipal <br /> supply well MW-9 as a means of evaluating the affect that pumping of MW-9 has on <br /> the potentiometric surface of the Intermediate Aquifer. The Fox River wells are <br /> likely too far from MW-9 for this purpose. Nestle should evaluate whether or not the <br /> Fox River wells are too far away to be useful for the system monitoring. If so, Nestle <br /> should install monitoring wells or piezometers in the Intermediate Aquifer closer to <br /> MW-9. <br /> If you have any questions, please contact Jim Brownell at (916) 464-4675, or by email at <br /> jbrownell@waterboards.ca.gov. <br /> James R. Brownell, M.S., P.G. <br /> Engineering Geologist <br /> cc: Distribution list <br />