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Mr. Mike Desso - 2 - 18A ugust 2010,,b,, <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 decaffeination 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 802 Vera Avenue is categorized as an Impacted Well. Upon <br /> confirmation that a domestic well is impacted, the Replacement Plan requires Nestle to <br /> provide the residence with bottled water within 24 hours, establish bottled water delivery <br /> service within 72 hours, and wellhead treatment within 7 working days. Therefore, Nestle <br /> was required to provide bottled water on 12 August, establish bottled water delivery by <br /> 14 August, and install a wellhead treatment system by the end of day on Friday, <br /> 20 August 2010. <br /> ECM recently identified the well at 802 Vera Avenue and another at 1051 Robert 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 /> Nestle must notify the Central Valley Water Board staff by telephone or email regarding <br /> compliance with the Replacement Plan schedule by 20 August 2010. If you have any <br /> 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. John Deegan, 802 Vera Avenue, Ripon, CA 95366 <br /> Distribution List <br />