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. mar va aul lI .YY CAS 10003 <br /> KLEINFELDEa <br /> The results of the Nitrate-Nitrogen (iv) analysis (Plate A-15) indicate a Nitrate-Nitrogen (N) <br /> concentration of 3.91 mg/l. With the rime-nitrogen level(1)in the groundwater sampled at tgg <br /> well measured at 3.91 mg/J, both the high and low estimates, when added to the results of the test <br /> of the sampled water, are above the maximum contaminate level of 10 man for nitrogen. The <br /> Hantzsche equation has several limitations when applied to this pmject. The e-qua+i-n does apt <br /> take into account the large denth to groundwater or the 75 to 90 feet of interlayer of silt ;a„ds, <br /> And clays TIM rrI in that cAe _bovery Both. fw.wY CCouii]1u'E signitu.dLtly to <br /> denitrification of the :vasty wale:. UsingL` l <br /> csignated Level ,•.ethodotogy (uLivi) in acwraancc <br /> ...ttCo- 11tIle, Regi6Lai v ate, Quality Conal of Board criteria (equation 4 on page 43, <br /> October 1.9000), assuming an environmental attenuation factor (EAY) Of 100, the nitrate <br /> concentration of nitrified !each field effluent (N,.) would need to be 1,000 mg1l or greater to <br /> effectively increase the nitrate N of the groundwater above 10 mg/l. The EAF represents an <br /> average disposal situation like a landfill in the alluvium of the Central Valley with a significant <br /> depth (i.e., 15 to 50 feet) of soil containing appreciable and continuous clay or silty-clay strata <br /> between the base of the landfill and groundwater. Rnged on this analysis, we conclude that the <br /> proposed office building for the site gbmild not cause a rise in the nitrate levels above •he —ate <br /> standards for the oeL—%1 1-10—nd't%,at.^.r condiSiCJIIS be Cath !� <br /> L:;:` aT10r:� <br /> The conclusions of this report are. based on the information provided regarding .he emsting and <br /> pMosed development and on the Site conditio <br /> iIS' <br /> isrn •e CftSac o :au as„SiEdthat.ui ptrGvlativn tcSt repit <br /> paiu <br /> general area. <br /> This cofuPletes the scope of work requested. Our work was performed in general accordance <br /> with the standard of care that exists in San Joaquin County. No other guarantee or warranty, <br /> expressed or implied, is made. <br /> Respectfully submitted, #s49-V-,OFESSrt"p\ <br /> KI EITil4F , FR;LNQ /&M, / `6WC111 <br /> � —��.d.�.,G <br /> Tn , xl TIl <br /> �FOjC <br /> 9��*4 <br /> )ftoteftm cai Department Manage-?--' <br /> RELM <br /> / Attachment <br /> LU-4�1{»1.liU1/2U 11xW2 runt. 14.2001 <br /> 0 2001 xleinfcldet,Inc. Page 4 of 4 <br />