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Honorable Pete Hoffinann, Chair And Members of the County Council HAWAII COUNTY COUNCIL County of Hawaii Page 3 January 22, 2007 drywells or other approved infiltration devices, up to the anticipated one-hour, ten year storm event. This will cover all new subdivisions. The proposed amendments to Chap. 25 would require that most new developments that need "plan approval" would have to first get a "site drainage plan" approved by DPW. "Plan approval" is a review by the Plazming Department that is required of new construction, except in RS, RA, A, FA, and IA zones, and single-family dwellings in all zones. So, for example, a new apartment building, hotel, industrial building, or commercial building would need plan approval. The CZARA does not cover agricultural uses, but the proposed Chap. 25 amendments include a new requirement that "major agricultural products processing facilities" receive plan approval. Although these aze allowed in A zones as a matter of right, they are often more like industrial buildings, and it would be more in keeping with the spirit of the CZARA to include such buildings under the requirements. A few types of uses that require plan approval will not need the "site drainage plan", such as the change in use of existing buildings (sec. 25-2-71(b)). The requirements of the "site drainage plan" are contained in the proposed amendments to sec. 27-20. Chap. 27 is the county's flood control code, and technically, the Planning Commission does not need to review changes to Chap. 27. The proposed amendments, however, aze a package and have to be looked at in combination with the changes to sec. 27-20. The site drainage plan also requires that the developer provide a stormwater system that contains rainwater onsite up to the one-hour, ten year storm, and discharge it into a drywell or other infiltration device. The Department of Public Works also has a set of amendments to Chap. 27 that is being forwarded to the Council under a separate cover letter. These amendments are meant to comply with requirements of the Federal Emergency Management Administration, and are mainly related to flood control issues. This bill from the Department of Public Works will probably be assigned to the Council Committee on Public Works and Inter- governmental Relations, while this proposed ordinance making changes to Chap. 23, 25, and 27 will probably be assigned to the Council Committee on Planning. We would