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I <br /> July 5,2005 <br /> NOA Project Number: E05027A <br /> 6.0 CONCLUSIONS AND RECOMMENDATIONS <br /> r <br /> Our office concludes that the nitrate loading calculation predicted a potential build-up on nitrogen <br /> above 10 mg/L-N (12.7 mg/L-N). However, considering the presence of fine grained soils, <br /> geological units,and percolation test information in addition to the deep depth of ground water,it is <br /> doubtful whether the aquifer will be impacted by this development As mentioned above, this <br /> Nitrate Loading Calculation did not not allow for a second dwelling unit <br /> A revised engineered septic system design using eight foot deep sumps rather than 25-foot deep <br /> seepage pit is presented to mitigate the moisture zone encountered at a depth of 10 feet This zone <br /> r is likely from the accumulation o seasona rams on the hard pan surface. a use of sumps to <br /> mitigate this moist/wet zone was suggested by EHD Staff. <br /> r. Our office believes the site is suitable for development with our engineered septic system plan for a <br /> primary residence. This plan is attached to this report. The EHD rules and regulations should be <br /> followed to insure proper septic system construction and setbacks. <br /> 6.1 Attachments <br /> L All required attachments and appendices can be found at the rear of this package. <br /> 7.0 LIMITATIONS <br /> The conclusions of this report are based on the information provided regarding the existing and <br /> proposed development,the use of the subject property,and the site conditions as they existed at the <br /> time we excavated our test holes and performed the percolation tests. It Nvas assumed that the test <br /> holes and percolation test results are representative of the subsurface conditions in the general area. <br /> Our professional services were performed, our findings obtained,and our conclusions proposed in <br /> V accordance with generally accepted engineering principles and practices. This warranty is in lieu of <br /> all other warranties either expressed or implied. Test findings and statements of professional <br /> opinion do not constitute a guarantee or warranty, expressed or implied. <br /> L <br /> NEIL O.ANDERSON&ASSOCIATES,INC. <br /> it �p�d QUO <br /> J wF�COC/ <br /> O <br /> r avid J. Welch,M.Sc. ¢ OP No. 2151 S <br /> CEG-2151, CHG-653, GP-1049 , CERTIFIED , <br /> ENGINEERING <br /> Environmental Division Manager N� GEOLOGIST g <br /> r �TFOFC <br /> AS\FO�� <br /> 7 <br />