CORRESPONDENCE_1971-1981 - Laserfiche WebLink

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FOM"•OOA CONTINIIATIOM * • Kw num Aomom T mrn RaGULATU MS WITH TML SLCRLTARY Of STATS (►wwoi1 N Oworoom Colo 3 W- 11390.1) (d) Inundation of disposal areas shall not occur until the site is closed in accordance with requirements of the regional board. (e ) Disposal areas shall not be subject to washout. (f) Leachate and subsurface flow into the disposal area shall be contained within the site unless other disposition is made in accordance with requirements of the regional board . (g) Sites shall not be located over zones of active faulting or where other forms of geological change would impair the competence of natural features or artificial barriers which prevent continuity with usable waters . (h) Sites made suitable for use by man-made physical barriers shall not be located where improper operation or mainte- nance of such structures could permit the waste , leachate , or gases to contact usable ground or surface water. (i ) Sites which comply with(�; (j�, Cc", Ce,), Cf), g and �',Y but would be subject to inundation by a tide or a flood of greater than 100-year frequency may be considered by the regional boardLIP U as a limited Class I disposal site . eA 2511 . Class II Disposal Sites. Class II disposal sites " LA are those at which protection is provided to water quality from F Group 2 and Group 3 wastes. The types of physical features and Z the extent of protection of groundwater quality divides Class II W sites into the two following categories: 9: Class II-1 sites are those overlying usable groundwater 3 oand geologic conditions are either naturally capable of preventing wlto Z lateral and vertical hydraulic continuity between liquids and o gases emanating from the waste in the site and usable surface or ° ground waters, or the disposal area has been modified to achieve : . such capability. Class II-2 sites are those having vertical and lateral hydraulic continuity with usable groundwater but for which C&-- w ~ geological and hydraulic features such as soil type , artificial , � barriers, depth to groundwater, and other factors will assure protection of the quality of usable groundwater underneath or boti adjacent to the site . The following criteria must be met to qualify a site as Class II: (a) Disposal areas shall be protected by natural or arti- ficial features so as to assure protection from any washout and from inundation which could occur as a result of tides or floods having a predicted, frequency of once in 100 years . -3-