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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 Health Officer." (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 Tables 16 -2 and 16 -3, the proposed site may be subjected to percolation tests acceptable to the authority having jurisdiction. (C) When a percolation test is required, no gray water system shall be permitted if the test shows the absorption capacity of the soil is not acceptable as determined by the Health Officer or is less than eighty -three hundredths (0.83) gallons per square foot (33.8 L /m or more than five and twelve hundredths (5.12) gallons per square foot (208.5 Lim') of leaching area per twenty -four (24) hours. (D) The following formula can be used to estimate the square footage of landscape to be irrigated based on ET data: LA = GW ETx PF x 0.62 Where: GW = estimated gray water produced (gallons per week) LA = landscaped area (ft ET = evapotranspiration (inches per week) PF = plant factor, based on climate and type of plants 0.62 = conversion factor (from inches of ET to gallons per week)." (20) Amending Section 1611.0. Section 1611.0 is amended to read: "1611.0 Irrigation/Disposal Field Construction. (See Figure 16 -5.) The Health Officer may permit subsurface drip irrigation, mini -leach field or other equivalent irrigation methods which discharge gray water in a manner which ensures that the gray water does not surface. Design Standards for subsurface drip irrigation systems and mini -leach field irrigation systems are as follows: 9