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w �y <br /> 3)cccmtrr 16,2002 <br /> Job Dumber. t.(__:02-2t3 <br /> fi F gc 11 <br /> Table ti. <br /> �. Sutumary of Nitrate -Mass Balance Analysis: <br /> Result Acres Ate, Effluent DvPitrificata►n (d) Deep Percolation <br /> (Ne.) (A) Daity Concentration of RainiJti (R) <br /> G: (Plate 9) Flow Q) (N'A [Plate H) <br /> (7'ahte 6) <br /> 4.4 mg.L•-N' 15.7 657 gpd 45 mgt_.N? E6°rG slot in '-- <br /> ' NoiCi MUM=writaminate Teti-ct(NIC-.)for Nitrate is 10 mgiL-N and 45 rnpVL as NO-, Picase w4c that Nc► <br /> [nitrate%as'le levcl of usva;c)4 45 mg;L-N is a_iA retalad to the nitrate 6 eking water MCL of 45 rngq-m:N(,'. <br /> J <br /> VUL CONCLUSIONS AND RL;CC)4tMENDATTONS <br /> In conclusion,a rapid percolation rate of le�us than 1.7 mtnfinch was measurod within tl e <br /> Percolation test boring. Our office c )untered loose sandy soils to a total h of to fed <br /> during our field investigation. The depth to ground watcr-at the.sitc was 23 feet according to tate <br /> rmast recent ground water depth traps.The nitrate lavcl m�msured from the onsite domestic well <br /> l - indicated high c mmitrations in the ground.wator The nitrate level measured in the well was <br /> collected and-tested two{2)diffavlat times and was found to be-77 and 120 mg,/L as NO_,. The <br /> Environmental Protcuion Agewy maximum contaminalc level fur drialdrig water for nitrate:as <br /> NO3 is 45 mg,'l.for 10 cngR,as nitrogen N). A nitrate plume in the ground water appears to exist <br /> *ithin the local area which probably criginated from the use.of septic systems,agricultural <br /> r fertilizers, or possibly dairy activities ora combination of the uses. <br /> The geologic mt~ p gad sail leaps of the local area indiuete the sandy conditions also <br /> exim thrhughoot the arm- The ground water map indicates that shallow ground water exists <br /> throughout the area- It is well.lcnown that for sande snits of high perTne ability wrobrincd With the <br /> shallow depth to ground water, the shallow aquifer is susceptible to nitrate i"Vacts from human <br /> . activities. <br /> r <br /> [�[Ewad_ing <br /> cause of the sandy conditicotis.the rapid percolation rate measured,the shallo'kv depth <br /> *atcr,acid tho pre-existing nitrate condition of the grott r!water, we reCornmen the <br /> r engineered se. tic system to reduce nitrai� a et1lueiTi. Since the nitrate <br /> [" mice indicated minimal long term impac,�ts duc mainly to the size of the property. weieve that long tenn verification monitoring is warrantied for this prrojecL Thendations for the prejrut arc as follows: <br /> e � <br /> t <br />