SU0004864 SSNL - Laserfiche WebLink

Home Browse Search

V. CALCULATED IMPACT FROM NITRATE-NITROGEN LOADING- ,. NLS 3.1 3. ,3.4 The calculated-or estimated nitrate impact to the soil and ultimately to the groundwater from this project is difficult to determine due to the number of variables'involved. , The two sources`of nitrate loading origination in-this'locale are agricultural inputs (organic matter' decomposition and fertilizers), and on-site septic systems from present and future development.. Of- primary consequence of the development of this property will be nitrogen fertilizers applied to the remaining acreage if placed under agricultural acreage. This is due to the fact that in comparison to the land base area, the future septic system area will be significantly smaller than the agricultural acreage. Y NLS§ 3.4 he primary variables involved in quantifying nitrate impact to the underlying groundwater are Total Nitrogen concentrations, volume of yearly wastewater flows, extent of denitrification, evapotranspiration potential, and nitrogen fertilizer applications. Denitrification capabilities of the indigenous clayey surface and shallow subsurface soils are expected to assist in decreasing nitrate loading potential. Ammonium retention in the clay soils should also be a factor, as has been observed in other projects with similar soils. Evapotranspiration was not factored in. the nitrate loading calculations; however, it may be a significant part of wastewater management and consequently nitrate-nitrogen loading. In addition, future.agricultural production that may occur.on each individual Parcel has not been taken into consideration since it is unknown at this time. Domestic wastewater flows have been studied for decades with data published in the scientific literature, specifically Reference No. 15: Small and Decentralized Wastewater Management S sy terms. The total daily water use-is a combination of household and personal uses, as itemized below: Z(25 'HOUSEHOLD f� PERSONAL USE gal for:dish dry 2 gal for drinking and cooking 10 gal forwashing _ 3 gal for oral hygiene U for use gal for bathing 16 ga for toilet flushing/sin ashing /FLOW RATE in galslhome/day= 40 gals/householdlday+(35 gal/person/day x number of persons home). Assuming the average household within the ro'ect will have 4_persons per house (husband, wife and two children), the daily wastewater flow_ rate ca_n_be estimated at: 40 gals + 35 gals x 4 eo le/home = 180.gals/day for an average flow per resident of 45 gals. Although the residential structures must be built with water saving devises and fixtures, as a safety factor, the average flow per-resident will be increased by 2x to 90 gals/resident/day(4 people x 90 gals/day= 360 gals/house/day. The peaking factor for individual residences on septic tanks will vary with.the day of the week and usage. Peak hourly rates are normally associated with the discharge of clothes wash machines, dishwashers and shower/bath water. The ratio of the peak day tot-average day can vary depending upon the time of the year and usage,but is usuallyo�dl.l Page-9- .. Chesney Consulting