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estimated gray water discharge pursuant to Section 1606.0 of this chapter, or the <br /> size of the holding tank, whichever is larger. The area of the irrigation/disposal <br /> field shall be equal to the aggregate length of the perforated pipe sections within <br /> the valved zone multiplied the width of the proposed irrigation/ disposal field. <br /> Each proposed gray water system shall include at least three (3) valved zones, <br /> and each zone shall be in compliance with the provisions of the section. No <br /> excavation for an irrigation/disposal field shall extend within three (3) vertical <br /> feet of the highest known seasonal groundwater, nor to a depth where gray <br /> water may contaminate the groundwater or ocean water. The applicant shall <br /> supply evidence of groundwater depth to the satisfaction of the authority having <br /> jurisdiction." <br /> (19) Amending Section 1608.0. Section 1608.0 is amended to read: <br /> "1608.0 Determination of Maximum Absorption Capacity. <br /> (A) Wherever practicable, irrigation/disposal field size shall be computed from <br /> Table 16 -2 and Table 16 -3, or Water Demand based on Evapotranspiration <br /> (ET) data. <br /> (B) In order to determine the absorption quantities of questionable soils other <br /> than those listed in Tables 16 -2 and 16 -3, the proposed site may be <br /> subjected to percolation tests acceptable to the authority having jurisdiction. <br /> (C) When a percolation test is required, no gray water system shall be permitted <br /> if the test shows the absorption capacity of the soil is not acceptable as <br /> determined by the authority having jurisdiction or is less than eighty -three <br /> hundredths (0.83) gallons per square foot (33.8 L /m or more than five and <br /> twelve hundredths (5.12) gallons per square foot (208.5 L /m of leaching <br /> area per twenty -four (24) hours. <br /> (D) The following formula can be used to estimate the square footage of <br /> landscape to be irrigated based on ET data: <br /> LA = GW <br /> ETx PF x 0.62 <br /> Where: GW = estimated gray water produced (gallons per week) <br /> LA = landscaped area (ft <br /> ET = evapotranspiration (inches per week) <br /> PF = plant factor, based on climate and type of plants <br /> 0.62 = conversion factor (from inches of ET to gallons per week)." <br /> 7 <br />