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known seasonal groundwater, nor to a depth where gray water may contaminate <br /> the groundwater or ocean water. The applicant shall supply evidence of <br /> groundwater depth to the satisfaction of the Health Officer." <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 Health Officer or is less than eighty -three hundredths <br /> (0.83) gallons per square foot (33.8 L /m or more than five and twelve <br /> hundredths (5.12) gallons per square foot (208.5 L /m of leaching area per <br /> 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 /> (20) Amending Section 1611.0. Section 1611.0 is amended to read: <br /> "1611.0 Irrigation/Disposal Field Construction. (See Figure 16 -5.) <br /> The Health Officer may permit subsurface drip irrigation, mini -leach field or <br /> other equivalent irrigation methods which discharge gray water in a manner <br /> which ensures that the gray water does not surface. Design Standards for <br /> subsurface drip irrigation systems and mini -leach field irrigation systems are as <br /> follows: <br /> 9 <br />