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Mr. Mike Desso - 2 - . 18 August 2010f <br /> Nestle USA Inc. <br /> Contingency Plan (Replacement Plan), dated 15 May 2007. The Replacement Plan defines <br /> three categories for domestic water supply wells that have been confirmed to contain <br /> contaminants that are a result of TCE releases at the former Nestle coffee decaffeination <br /> facility: <br /> • Potentially Threatened Well <br /> • Threatened Well <br /> • Impacted Well <br /> The following table lists the concentration of TCE that determines the category in which any <br /> private potable well is to be placed: <br /> May 2007 Water Replacement Contingency Plan Trigger Concentrations <br /> (micrograms per liter) <br /> Potentially Threatened Well Threatened Well Impacted Well <br /> 0.1 1.7 5 <br /> The domestic well at 1051 Robert Avenue is categorized as a Potentially Threatened Well. <br /> Upon confirmation that a domestic well is Potentially Threatened, the Replacement Plan <br /> requires Nestle to notify the well owner and the Central Valley Water Board of the laboratory <br /> analyses results within 24 hours and begin monitoring the well on a monthly basis. The <br /> Replacement Plan requires Nestle to continue monitoring at this frequency until <br /> concentrations of contaminants, in this case TCE and cis-1,2-DCE, are less than <br /> 0.1 micrograms per liter. <br /> ECM recently identified the well at 1051 Robert Avenue and another at 802 Vera Avenue by <br /> comparing addresses of Ripon residences with addresses that the City of Ripon mails water <br /> utility bills to for municipal water supply system service. By 31 August 2010 Nestle shall <br /> submit a letter to the Central Valley Water Board documenting the sensitive receptor surveys <br /> performed in the 1980s and 1990s, including actions taken to locate water supply wells <br /> potentially contaminated by TCE and its breakdown products. If applicable, the letter must <br /> include additional actions Nestle intends to take to assess whether other unidentified wells or <br /> sensitive receptors are present. <br /> If you have any questions, please contact me at (916) 464-4675, or by email at <br /> jbrownell@waterboards.ca.gov. <br /> James R. Brownell, P.G. <br /> Associate Engineering Geologist <br /> cc: Mr. Ken Burton, 1051 Robert Avenue, Ripon, CA 95366 <br /> Distribution List <br />