SU0002228 SSNL - Laserfiche WebLink

Home Browse Search

PAGE 5 FROM THE ABOVE EQUATION, IT WAS FOUND THAT 36 . 81 mg/l WOULD BE PRODUCED BY THE SEPTIC SYSTEMS OPERATING AT 203 GALLONS PER DAY. THE SEPTIC SYSTEM WHICH IS EAST OF THE RESIDENCE IF REMOVED IN 2010, AS PLANNED, WOULD DECREASE THIS VALUE TO 28 . 72 mg/l . B) FOR WATER QUALITY REASONS AS VERIFIED BY MS. LINDA TURKATTE (APPENDIX "E" ) A VALUE OF 150 mg/l IN THE WATER IS ACCEPTABLE FOR THE TYPE OF DEMAND AND USE OF THE WATER. THIS VALUE WAS THEN TAKEN AND USED IN THE EQUATION BELOW TO FIND THE AMOUNT OF ACRES PER DWELLING UNIT NEEDED TO MAINTAIN THIS WATER QUALITY. A= 0. 01344W[M-DM-150 ] -------------------- EQUATION ( 2 ) . R( 150-N) WHERE: A= CALCULATED GROSS ACREAGE PER STRUCTURE USING SEPTIC SYSTEM W= AVERAGE DAILY WATER FLOW TO SEPTIC SYSTEM ( 203 GALLONS) SEE APPENDIX "K" FOR FORMULA. M= NITRATE CONCENTRATION OF NITRIFIED LEACHFIELD EFFLUENT. (60 mg/1) BASED ON ACCEPTED VALUE OF 40 mg/l TO 60 mg/l DEPENDING ON SOIL CONDITIONS. �- D= PERCENT OF DENITRIFICATION OF LEACHFIELD EFFLUENT ( . 25) BASED ON ACCEPTED VALUE FROM . 10 TO . 25 HIGHER HIGHER VALUES FOR MORE SANDY SOILS. R= ANNUAL PERCOLATION OF PRECIPITATION ( 2 . 35 INCHES) REFER TO SECTION V ABOVE. N= BACKGROUND NITRATE CONCENTRATION OF DEEP PERCOLATING PRECIPITATION. ( 1 . 0 mg/1) ACCEPTED VALUES FROM . 50 mg/l TO 1 . 0 mg. IT WAS FOUND THROUGH THIS EQUATION THAT FOR EVERY 0 . 81 ACRES, ONE DWELLING USING A SEPTIC SYSTEM MAY EXIST AND NOT AFFECT THE WATER QUALITY. IF 150 IS REPLACED WITH 10 , THE COMMON ACCEPTED VALUE FOR STANDARD RESIDENTIAL HIGH DEMAND DRINKING WATER, A FINDING RESULTS RESTRICTING A DWELLING USING SEPTIC SYSTEMS TO HAVE 4 . 5 ACRES FOR EVERY SEPTIC SYSTEM IN ORDER TO MAINTAIN WATER QUALITY. THE PROPOSED AND EXISTING SYSTEMS EXISTING ON A LOT OF 46 . 79 ACRES WOULD BE ADEQUATE TO MAINTAIN WATER QUALITY IN BOTH SCENARIOS.