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approval is issued for a gray water system, or at any time during the construction thereof:" (17) Amending Section 1604.0 (A). Section 1604.0 (A) is amended to read: "(A) Plot plan drawn to scale and completely dimensioned, showing lot lines and structures, direction and approximate slope of surface, location of all present or proposed retaining walls, drainage channels, water supply lines, wells, paved areas and structures on the plot, number of bedrooms and plumbing fixtures in each structure, location of private sewage disposal system [and 100 percent expansion ar a] or building sewer connecting to the public sewer, and location of the proposed gray water system." (18) Amending Section 1607.0. Section 1607.0 is amended to read: "1607.0 Required Area of Subsurface Irrigation/Disposal Fields (See Figure 16 -5.) The authority having jurisdiction may require that each [Each] valved zone shall have a minimum effective irrigation area in square feet as determined by Table 16 -2 for the type of soil found in the excavation, based upon a calculation of estimated gray water discharge pursuant to Section 1606.0 of this chapter, or the size of the holding tank, whichever is larger. The area of the irrigation/disposal field shall be equal to the aggregate length of the perforated pipe sections within the valved zone multiplied the width of the proposed irrigation/ disposal field. Each proposed gray water system shall include at least three (3) valved zones, and each zone shall be in compliance with the provisions of the section. No excavation for an irrigation/disposal field shall extend within [five (5)] three (3) vertical feet of the highest known seasonal groundwater, nor to a depth where gray water may contaminate the groundwater or ocean water. The applicant shall supply evidence of groundwater depth to the satisfaction of the authority having jurisdiction." (19) Amending Section 1608.0. Section 1608.0 is amended to read: "1608.0 Determination of Maximum Absorption Capacity. (A) Wherever practicable, irrigation/disposal field size shall be computed from Table 16- 2[-]and Table 16 -3, or Water Demand based on Evapotranspiration (ET) data. (B) In order to determine the absorption quantities of questionable soils other than those listed in [Table] Tables 16 -2[ and 16 -3, the proposed site may be subjected to percolation tests acceptable to the I' i!L' ' ol 1 'nr.,c,i (7r /mime! ri) 2006 1 1'c ' u.N /)rr ill (;i!l