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California Integrated -2- Waste Management Board Response: The deficiencies cited have been corrected as shown on the attached revised resolution adopted by our County Board of Supervisors on September 25, 1990. 3. On page 4, in the third paragraph under Ground Water, you state that G-1 is the up gradient ground water monitoring well. You go on to say the background well, G-3, will be tested for baseline water quality. Please address this inconsistency. Response: The reference to G-3 as the background well is an error. The background well is G-1. Plan holders will be notified of the error. 4. On page 13, the first paragraph states that the permanent drainage control facilities within the landfill will have the capacity to carry peak flow from a 100-year occurrence storm. The Waste Discharge Requirements, Discharge Specification B.12 states: "Precipitation and drainage control systems shall be designed and constructed to accommodate the anticipated volume of precipitation and peak flows from surface runoff under 100-year, 24-hour precipitation events. " Response: The County Storm Drain Design Manual standards referred to in the project RDSI, page 41, meet the WDR requirements for the site drainage facilities. A Copy of the County Standards are enclosed in support of this determination. Additionally, the 100-year frequency curve is enclosed and is to be used instead of the 10 year curve. 5. On page 16, in the second paragraph, it is anticipated that only two additional ground water monitoring wells will be needed in the future to effectively monitor the facility. This site will consist of approximately 185 acres of landfilled area. These monitoring wells will monitor modules 1 and 2. Once waste is placed in module 11, monitoring well G-1 will no longer be a background well.