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11✓02/Gr FRI 10:50 FAX Nn049 <br /> "f 4 KL€INFELDER <br /> II <br /> gpdhesidence) <br /> NNitrate concentration of nitrified leachfield effluent(mg/1) =45 mg/1 typical(Ugntzsche and <br /> lyirmemom(1992)) <br /> D = Percent deatrificstion of leanhfield effluent = 0.3 percent (Selected since the near-surface <br /> soils are reporhrd to eo>rsist of firne clays acct silts that tend to increase denitrification) <br /> r = Annual deep percolation of precipitation(inches)= 13.5 inches <br /> Nh = Background nitrate concentration of the deep percolating precipitation—mgll 0 4.5 mg/1 as N <br /> our calculations are as frallgws: <br /> Single Home <br /> N. — .44( (45)(1.—0.3)+4.5 (13.5) = 27.7+60.8 6.15 mg/1 as N <br /> .44(2)+3 0.89+13.5 <br /> TWO Homes <br /> Nc _ .89 2 45 1 —0.30 +4.5 13.5 = 56.1 +650:8 — 7.64 mo as N <br /> .89(2)+13.5 1.78+13:5 <br /> In suinrna y, the Hantzsche. equation indicates that only two homes can be placed on the lot. <br /> Roweve:r, elevated nitrate levels are known to exist in the area and with groundwater relatively <br /> high during the summer irrigation season,we Teem mend that the proposed Ieach field extend no <br /> deeper than 2 Va feet below existing grade. <br /> LDHrATIONS <br /> The conclusions of this report are based on the information provided regarding the existing and <br /> proposed development and on the site conditions. This completes the scope of work mquested <br /> Our work was performed in general accordame with the standard" of care that exists in San <br /> Joaquin County. No other guarantee or warranty,expressed or implied is made. <br /> Respectfully submitted, <br /> .a <br /> KLEINFELDER,INC. <br /> r � <br /> Ron Heirizen, G.E. <br /> Regicrl.Manager/Senior Principal <br /> i <br /> RTH:mc <br /> i <br /> i <br /> ,3 <br /> ZOA667-DIMI 11.743 Page 3 of 3 <br /> Copyright 2DD! Kteinfelder,Inc. November 2.2001 <br /> I <br />