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ATTACHMENT "A" Systems that do not qualify as a Public Local Groundwater Supply System, including, but not limited to individual water supply wells. 7. Public Well — A water well providing piped water for human consumption and defined as a "Community Water System" or a "Public Water System" under Chapter 290 of the Texas Administrative Code. 8. Rainwater Harvesting System — An individual potable water supply system approved by the Department and having rainwater as its source and designed to provide for any or all of the domestic water requirements, including irrigation. D. Facility Planning All of the terms and provisions of 30 TAC §285.4 are incorporated within the Rules of Hays County except as expressly amended below. 1. Land Planning, Site Evaluation and Minimum Lot Sizing. The following requirements shall apply to all lots on which an OSSF is to be utilized: (A) A platted or unplatted single family residential lot shall have a surface area of at least the acreage designated in Table 10 -1 below. (B) Small Multi -Unit Residential Developments. Multi -unit residential developments with four or fewer individual dwelling units, including duplexes, may utilize lots smaller than the acreages set forth in Table 10 -1, provided: (1) site specific evaluation materials, for a central system or individual systems, are prepared by a Texas licensed professional engineer or a Texas registered professional sanitarian and submitted to the Department for review and approval; and, (2) there is no more than one (1) dwelling unit for each TCEQ minimum lot acreage and no more than two (2) dwelling units for each minimum lot size as designated in Table 10 -1 below. (C) Other Multi -unit Residential Developments and Non - Residential Developments. Platted or unplatted lots used for multi -unit residential developments with more than four dwelling units, including apartment complexes, groups of rental dwelling units and lots used for non - residential purposes (e.g. office, commercial, industrial or institutional uses) producing domestic wastewater: (1) shall have a minimum lot size of 1.0 acres and a total surface acreage of at least one (1) acre for each dwelling unit equivalent (DUE) per day; and, (2) the on -site sewage facilities for these developments shall be designed based on site specific evaluation materials. (D) OSSFs serving Manufactured Home Rental Communities and Recreational Vehicle Parks where spaces are rented or leased and are not subdivided for