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Mr. John Parks Page 4 The beneficial effect of greater denitrification(>25%)and planting high nitrating consuming grasses on the septic mound are uncertain. As an option, one way to track the performance of the system would be to monitor nitrate levels in the shallow ground water near the septic system leach field. If monitoring is deemed helpful, the details of a program could be arranged between the County Environmental Health office and the property owner. We believe at least one up gradient (eastward) monitoring well and one down gradient monitoring well (westward) could be used for comparisons. These wells could be placed 200 feet east and 50 feet west of the septic system. A third monitoring well could be placed at some larger distance down gradient(say 1000 ft west or at the western boundary of the property). Due to the large size of the parcel,we believe the use of the septic system will not adversely affect the ground water of the region. The septic design and installation should follow the current San Joaquin County criteria. IV LIMITATIONS The conclusions of this report are based on the information provided regarding the existing and proposed development, the use of the subject property, and the site conditions as they existed at the time of our investigation. It was assumed that the test holes and ground water tests are representative of the subsurface conditions in the general area. Our professional services were performed, our findings obtained, and our conclusions proposed in accordance with generallyaccepted engineering principles and practices. This warranty is in lieu of all other warranties either expressed or implied. Test findings and statements of professional opinion do not constitute a guarantee or warranty, expressed or implied. Very truly yours, NEIL O. ANDERSON & ASSOC., INC. FESs�4N� David J. Welch, M.Sc. �� 0•AX,0 deny Staff Geologist tcob I a No. X45 -U XP. 3 A O �Or �� Nei 0. Ande n, President i OF CAT G6otechnical Engineer 2245 DW:dw cc: Mike Huggins, San Joaquin County Environmental Health Division i .... ..... _rte."' . ...,...