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Apri1,13, 2000 a . <br /> Job Number:L000-114 <br /> r , Page 7 <br /> r Dt:iiitnficationlFis an unportant process that mostly occurs in the septic system leach line... <br /> y ` •' whereby certain bacteria utilize the oxygen in the nitrate(NOO and release nitro en as to <br /> the atmosphere Denitrification is expressed as a percentage, and the normally accepted range is <br /> 10%to 25%" Soils with higher clay content,.moist soil conditions, high pFL and organic-material <br /> denitrify, 25% or more but soils with very,high sand content and fast,peculation rates are <br /> 'estimated to denitrify'at a lower rate, aboiit.1. 'Yo to 15%. Due to the presence.of brown sandy . <br /> clay surfaceaayer,the denitrification factor is estimated to be about 25.%. ` <br /> th our approach to estimate the quantity of effluent, 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 driv�er since.they.will.be present.only at the begutning and end of the work day: <br /> The average nitrate cAncentration of the waste stream ranges between 35 to 45 <br /> mg/1N 4 so conservatively 45 mg/1 N was used <br /> Table: Total Estimated Efnluent <br /> .(see worksheets in Appendix for calculations) <br /> (" Category Effluent '• People Weekly effluent girantity.per category <br /> ' estimation <br /> Monday to Friday 15 gallons '6 15 gallons x 6 people x S days=450 gallons/week <br /> Office Staff (Monday thrudgh Friday) <br /> Monday to Friday, 15 gallbus 6 15 gallons x 6 persons x 5 days=.450 gallons/week <br /> Maintenance Staff . (Monday through Friday) <br /> Monday to Friday. Z.5 gallons ' 40 7:5 gallons x 40 people x 3 days=1500 gallons/week <br /> " Truck drivers (Monday through Friday) <br /> 1k 2400 gallons per week/'7days per week <br /> rTotal: 343 gallonsc&hiew pit day(average) <br /> Ij <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 /> L' �U.S.Enviro ntalProtection4ncy{EPA)..1080 Design Manual:0a-SiteWastewaterTreatmeitt. <br /> and bisposal Systems.R4mt No. EPA-625 <br />