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PROJECT : Ahern Road Fueling Station February 28, 2022 <br /> Job No : 20=544 Ross P. Shoaf, Civil Engineer <br /> Nitrate Reduction Calculations <br /> These calculations are being based on an assumed Total Nitrate (TN ) loading of 100 m / I rather <br /> than the 85 m / I used in the Nitrate calculations done by Live Oak Geo Environmental , INC . . The <br /> filter sizing is also based on the BODS loading ( assumed 650 m / 1 ) . The sizing will be based on <br /> the larger required area of filter surface . <br /> The system is also being designed to achieve a greater than 50% reduction of Nitrate as <br /> outlined in the State OWTS manual section 10 . 9 . The addition of a Pre - anoxic and post- anoxic <br /> tank with Chemical feeders will be added to accomplish this . <br /> The Formula Used for Nitrate Sizing of the Filter /area is A = (TN /TNLR ) <br /> TN in lbs . = 100 X . 00000834 X 3225 ( avg . daily Load ) = 2 . 68965 lbs ./day <br /> A = 2 . 68965/ . 014 ( allowable sf loading rate ) = 192 sf of filter area needed <br /> The Formula Used for BODS ( OLR ) Sizing of the filter Area is A = BODS / OLR <br /> BODS in lbs . = 650 X . 00000634 X 3225 = 17 . 482725 lbs . /day <br /> 17 . 482725/ . 04 = 437 sf of filter area needed <br /> The Primary Filter bank will be sized according to the BODS Loading Rate <br /> Nitrate reduction from the Primary Filter bank coupled with the Pre -Anoxic tank is based on the <br /> anticipated reduction factor of 70% . Therefore, Nitrate output from the first stage of treatment <br /> should be 100mg/ I X ( 1 - . 70 ) = 30 mg/ l . The Second stage ( Post-Anoxic ) of treatment should <br /> reduce that figure by another 70% to a level well below 30 % of the original load . <br /> Page 5 Of 11 <br />