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authority having jurisdiction. <br />(C) When a percolation test is required, no gray water system shall be <br />permitted if the test shows the absorption capacity of the soil is not <br />acceptable as determined by the authority having jurisdiction or is <br />less than eighty -three hundredths (0.83) gallons per square foot (33.8 <br />z <br />L /m) or more than five and twelve hundredths (5.12) gallons per <br />2 <br />square foot (208.5 L /m) of leaching 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 <br />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 <br />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 authority having jurisdiction may permit subsurface drip irrigation, <br />mini -leach field or other equivalent irrigation methods which discharge <br />gray water in a manner which ensures that the gray water does not <br />surface. Design Standards for subsurface drip irrigation systems and <br />mini -leach field irrigation systems are as follows: <br />(A) Standards for a subsurface drip irrigation system: <br />(1) Minimum 140 mesh (115 micron) filter with a capacity of 25 <br />gallons per minute, or equivalent, filtration, sized appropriately <br />to maintain the filtration rate, shall be used. The filter back- <br />wash and flush discharge shall be caught, contained and <br />disposed of to the sewer system, septic tank, or with approval of <br />the authority having jurisdiction, a separate mini -leach field <br />sized to accept all the back wash and flush discharge water. <br />Filter backwash water and flush water shall not be used for any <br />purpose. Sanitary procedures shall be followed when handling <br />filter back -wash and flush discharge of gray water. <br />(2) Emitters shall have a minimum flow path of 1200 microns and <br />ul 17 <br />Ko,,,\c_i ci. lur/no/ I nt r,clnr, „1 !u 2006 ( I'( u,c i)rr,riclrci i„ /3i/1 269 <br />