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PAGE 4 <br /> VII . SOIL PROFILE AND PERCOLATION TEST: <br /> SEVERAL SOIL PROFILE AND PERCOLATION TESTS WERE PERFORMED FOR THE <br /> SITE AS FOLLOWS; <br /> A) REF; TO 06/22/98 LETTER TO MS. LINDA TURKATTE (APPENDIX <br /> "E" ) ITEM #1 FOR THE NITRATE TESTING AND THE PERCOLATION <br /> TESTING FOR ( 5) LOCATIONS IN THE DEVELOPED AREA. <br /> B) REF; TO NEIL O. ANDERSON & ASSOC. 12/10/98 PERCOLATION <br /> TEST REPORT (APPENDIX "F" ) WITH RESPECT TO THE SOIL PROFILE <br /> AND PERCOLATION TEST OF THE PROJECT'S NEW LEACH LINE SYSTEM. <br /> C) THE EXISTING TERRAIN OF THE SITE SLOPES TO THE SOUTH <br /> TOWARD THE RIVER. <br /> D) THE EXISTING SOLID PROFILE CONSISTED OF FINE TO MEDIUM <br /> SAND WITH SOME SILT WITH A MINIMUM OF 13 . 4 MIN./IN. <br /> PERCOLATION RATE. <br /> VII . CALCULATIONS: <br /> THE FOLLOWING EQUATIONS WERE DERIVED FROM THE "PREDICTING GROUND- <br /> WATER NITRATE-NITROGEN IMPACT" REPORT BY HANTZSCHE & FINNEMORE <br /> (REFER TO APPENDIX "K) . THESE EQUATIONS WERE USED IN FINDING THE <br /> FOLLOWING; <br /> 1 . NITRATE BY PRODUCT OF THE SEPTIC SYSTEM. <br /> r. 2 . DWELLING UNITS PER ACRE ALLOWED ON SEPTIC SYSTEMS IN <br /> ORDER TO MAINTAIN CURRENT WATER QUALITY. <br /> A) NITRATE CONTRIBUTION; TO WATER TABLE WITH EXISTING AND <br /> PROPOSED SEPTIC STRUCTURES: <br /> N= AWM( 1-D)+n(r) <br /> ------------------- EQUATION ( 1 ) . <br /> AW + r <br /> WHERE: <br /> N= CALCULATED NITRATE CONCENTRATION IN GROUND WATER <br /> RESULTING FROM DOMESTIC SOURCES AND PRECIPITATION. <br /> A= NUMBER OF BUILDINGS USING SEPTIC SYSTEMS PER ACRES. <br /> ( 3 . 0 BUILDINGS) <br /> W= ANNUAL WASTE WATER LOADING PER DWELLING UNIT ACRE <br /> ( 2 . 0 INCHES) BASED ON ACCEPTED VALUE OF <br /> 150 GPD/BUILDING. <br /> M= NITRATE CONCENTRATION OF NITRIFIED LEACHFIELD <br /> EFFLUENT. (60 mg/1) BASED ON ACCEPTED VALUE OF 40 <br /> mg/l TO 60 mg/l DEPENDING ON SOIL CONDITIONS. <br /> D= PERCENT OF DENITRIFICATION OF LEACHFIELD EFFLUENT <br /> ( . 25) BASED ON ACCEPTED VALUE FROM . 10 TO . 25 HIGHER <br /> HIGHER VALUES FOR MORE SANDY SOILS. <br /> r= ANNUAL PERCOLATION OF PRECIPITATION ( 2 . 35 INCHES) <br /> REFER TO SECTION V ABOVE. <br /> n= BACKGROUND NITRATE CONCENTRATION OF DEEP PERCOLATING <br /> PRECIPITATION. ( 1 . 0 mg/1 ) ACCEPTED VALUES FROM . 50 <br /> mg/l TO 1 . 0 mg. <br />