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i CC 7Nr8.6 ppm as nitrate-nitrogen (NO3-N) or 38.1 ppm as nitrate (NO3) ition to the above reductions in nitrate-nitrogen loading, further decrease in Ioading may occur from leachfield landscaping. The leachfield area is to be planted-in grass and landscape ^plants anc! c area. These plants will uptake nitrogen as ammonium and nitrate emanating from the effluent. IV. CONCLUSIONS AND RECOMME iJ -TIONS The nitrate loading calculations suggest the recharge effluent poten ial should not exceed the Drinking Water Standard/Maximum Contaminant Levels of 10 pp . nitrate-nitrogen, or 45 ppm nitrate. The percolation rates obtained from the perc testing procedures indicate an atxceptionAl soil permeability. Depending upon the final design imposed by the Environmental Health Department for effluent management, the leachfield criteria could be based upon the following: 1.) The leachfield area based upon the percolation rate obtained, 2.) The leachfield area based on the permeability of the soil eventually reaching a long term application rate (LIAR) of approximately 0.5 gals/ft'/day due to biomat formation, or 3.) The leachfield area calculated from the lineal foot required. As demonstrated in our report, it is our opinion that the leachfield area should be based upon the lineal feet of leachline calculated, but may be a combination of the three design criteria listed above. It is imperative that a 100%replacement area be designated in the event a repair is needed or an additional system installed. This replacement area is proposed to be directly south of the primary leachfield. At the time of this study and reporting, the domestic well to serve the Eagal Lake project had not been drilled. When t am leted the water must be sam led r cam�nl with Environmental Health Department regulations If a failure should occur with the proposed septic system leachfield, rehabilitation of they. 1 hfield with h dro etc. should be considered. If there is a failure, it is recommended to install a wastewater flow meter so that adjustments can be made to the existing system. However, it may be a Health De _artnq�pLtl�at_a wast Ovate e installed initially. In addition, all appurtenances must be low flow or ultra low flow devises. o within the Ski Shop should be on timers. I' Showers � It is recommended that effluent should remain in the second tank to maintain microbial activity during the winter months and not be pumped out and replaced with water. Retaining effluent throughout the winter in the second septic tank should be based on the certification that the septic tanks are water tight. E High elevation or shallow leachfields will take advantage of the grass and landscape plants proposed for the "picnic area," The denitrification potential of the referenced clay stratum in combination with landscape plants (grasses, shrubs and trees) in the leachfield area should reduce nitrate impact another 20 to 30 percent. However, leachli nes within landscaped areas should be k 9 Vaffey Aresearch