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f SSS§ 6.7 For this project, it is imperative.that:.1'.) The 1 e gineer/designer of the k residential structures, 2.) The plumber, 3.).The sep ' tem contra or, and 4.) The landscaper or f r7landscape architect; must coordinate their service simultaneously f r each individual Parcel. The architect/engineer/designer must orientate the hou M-the_Par- taking into consideration the size of the house and location of t septic system di a. a/she must coordinate with the f plumber to bring the influent to t e proper location in retati to the septic tank(s) location. The septic system contractor must co ect-the-s em othe plumber's piping and install the disposal area under.EHD guidelines. The landscaper must work with, and around the location of the tanks F and disposal areas. f NITRATE-NITROGEN IMPACT MITIGATION NLS§ 4.1',4.2 For maximum-nitrate impact reduction, conventiona eachlines will manage a small pereentage of effluent. Since theupper soils are composed of clay, ffiis-wild attenuate nitrate formation and denitrify nitrate molecules that have formed. The clay strata down below will also have this same_effect.- w Deep-rooted grasses may be planted over the disposal area to aid in evapotranspiration and take-up nitrogen in the form of nitrate and ammonium: Deciduous and evergreen plants may be planted no closer than 15 feet from any leachline to prevent root infiltration. The scientific literature suggests that denitrification may be enhanced by placing discharge piping higher in elevation toward the soil surface,particularly since the surface'soils contain approximately 20% clay. SSS§ 6:8 Depending upon the final.E--HD,-design criteria for effluent manage ;and h number of bedrooms each potential house may have, consideration should be given t}- enlaa septic system- as sal areas from the initial sizing parameters due to the clay oils enered and {the"shallow p�olation test results. lt'is.imperative to recognize that.all septic systems hav�a This lifespan is dependant on several factors.and is therefore difficult to determine. Lifer§pa s may be measured in months or years. Due to the indigenous claoardpan surface soils over the project site, most of the effluent volume will be managed by the deeper septic system structures, provided that "conventional" (leachlines and seepage pits) septic systems are installed: Consequently,three critical issues must be addressed: The first issue is limiting water use throughout any future homes as much as possible._As calculated on Page 6 of this report,the household usage for this Study has been determined to be 68 gals/resident,.and should not exceed this volume. Restricting water use also - includes checking for waterleaks in toilets, dripping faucets, etc. on a regular monthly basis. The second factor in extending the lifespan of each system is not installing garbage grinders, commonly called sink disposals. Food products ground-up by a disposal should be handled as a solid waste. Garbage disposals would increase the organic loading in the effluent leading to substantial biomat (clogging mat) formation. Thirdly,water softeners should also not be installed in the subdivision 4 because the sodium from water softeners may bind the clay soil and destroy permeability. Although this phenomenon is debated in the scientific literature, it is my opinion that it is a distinct z possibility and should be avoided since it could lead to a decrease in disposal area longevity. Page -9- Chesney Consulting