SITE INFORMATION AND CORRESPONDENCE

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w Mr. Mike Desso • - 3 - • 3 October 2006 t 6. Potentially impacted agricultural well. The Draft Plan should be revised to indicate that a potentially impacted well will be defined as one in which the initial sample COC concentration is above the PHG, or if a PHG has not been established for the constituent, the MCL. 7. Threatened agricultural well. The Draft Plan should be revised to indicate that a threatened well will be defined as one in which the confirmation sample COC concentration is between the QL and the PHG, or if a PHG has not been established for the constituent, the MCL; and the sample concentration has been presented to Regional Water Board staff for review of other considerations. Other considerations would include the affect pumping of the well has on migration of contaminants in the subsurface. 8. Impacted agricultural well. The Draft Plan should be revised to indicate that an impacted well will be defined as one in which the confirmation sample concentration is above the PHG, or if a PHG has not been established for the constituent, the MCL; and the sample concentration has been presented to Regional Water Board staff for review of other considerations. Other considerations would include the affect pumping of the well has on migration of contaminants in the subsurface. Responses Presented in the Draft Plan The Draft Plan establishes protocols to implement specific response actions when a contaminant has been detected and confirmed in a domestic, agricultural, or municipal supply well. The following is a list of responses presented in the Draft Plan: • Domestic supply well immediate response, • Domestic supply well interim response, • Domestic supply well long-term response, • Agricultural supply well initial response, • Agricultural supply well long-term response, • Municipal supply well initial response, and • Municipal supply well long-term response. In addition to domestic, agricultural, and municipal supply wells, all other types of supply wells threatened or impacted by CDCs emanating from the former facility should be included in the response plans. Comments on Responses Nestle should: 9. Domestic supply well immediate response. The Draft Plan should be revised to indicate that if the confirmation sample verifies that a concentration of a COC is between the QL listed in the MRP and the PHG, the well will be sampled monthly until four (4) consecutive well water samples are below the QL. Also, the Draft Plan should be revised to indicate that bottled water will be supplied within 24 hours after