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April,13, 2000 <br /> Job Number: W00-114 <br /> Pagel <br /> Denitrification.is an important process that mostly occurs in the septic system leach line",. <br /> whereby certain bacteria utilize the oxygen in the nitrate(NO3) and release nitrogen-gas (NZ)to ' <br /> the atmosphere. D614rification is expressed as a percentage,;and the normally accepted range is <br /> b` <br /> 10%0 2.5%. $oils with higher clay content;moist soil conditions,`high pH, and organic.-material <br /> denitrify.about 25% or more but soils with <br /> very,high sand.content and 'fast,peculation rates are <br /> "estimated to denitrify'at a lower rate, about 10%to 15%. Due to the presence.of brown sandy . <br /> clay surface.layer, theldenitrification factor is estimated to be about:25 %. <br /> . In our approach to estimate the quantity of eluent, we'used the following information for <br /> 'our calculation: Fifteen(15)gallons per day per employee and seven and one-half(7.5)'gallons <br /> - per'day per truck driver since they.will.be present•only at-the beginning and end of the work day- <br /> The average nitrate concentration of the waste stream ranges between 35 to 45 <br />. mgA-N a so conservatively 45 mg/1-N was used. <br /> Table: Total Estimated Effluent <br /> (see worksheets inAppendix for calculations) <br /> ' Category 'Effluent -People' Weekly effluent quantity.per category <br /> 1 E. estimation ._. i <br /> Monday to Friday 15 gallons '6 15 gallons x 6 people x 5 days=450 gallons/week <br /> Office Staff (Monday through Friday) <br /> Monday to Friday, 15 gallons 6 15 gallons x 6 persons x 5 days=.450 gallons/week � <br /> Maintenance Staff . : _ (Monday through Friday) <br /> Monday to Friday 7.5 gallons 40 7:5 gallons x 40 people•x.5 days 1500 gallons/week <br /> Truck drivers _ (Moriday through Friday) <br /> 2400 gallons per week/70ays per week <br /> Total: 343 gallons effluent per day(average) <br /> *Each driver works off site except for beginning and end of work day. Estimate.7.5 gallons per day per employee ! <br /> for this category. , <br /> U.S.Enviroinmental-Protection Agency(EPA).;1980: Design._Manual:On-Site Wastewater Treatment. h <br /> and Disposal Systems.Report No. EPA-025/'1-80-012:'390-pp. <br /> • - - Ih'. ., - •} _ -. - - - �ft OGS* _ _ IT <br />