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L LJune 12, 2006 �NOA Project Number: E06061A LA6.8 Discussion of Septic System Sizing Septic system construction should follow the San Joaquin County On-Site Wastewater Disposal L Standards where applicable. ✓7.0 CONCLUSIONS In summary, satisfactory percolation rates of the soil were achieved in the proposed septic disposal 6a Nitrate The soils appear suitable for a standard septic system. Please see the conclusions of the Nitrate Loading Study Part II of this report for engineering recommendations. LGround water lies between 60 and 90 feet below ground surface. Perched ground water was encountered by the staff of Neil O.Anderson&Associates, Inc. at depths ranging from three to ten feet below ground surface during prelims on May 24.2006. No ground water was L encountered in the shallow percolation test location for at least five feet below the bottom of the boring. For fall 1998 and spring 1999,respectively,ground water appears to flow to the east- southeast and east-northeast at gradients of approximately 10 and 40 feet per mile in the vicinity of the Site. /The on-site domestic water well was tested for nitrate and DBCP. DBCP was non-detectable in the Lground water sample. Nitrate was found at 50.8 mg/L-NO3 in the domestic well, above the maximum contaminant level for drinking water of 45 mg/L-NO3. Because nitrate was detected above the maximum con ant level,it is recommended that bottled water be c nsumed until the nitrate level can be reduced. A well driller may be able to deepen or repair the well It is recommended that EHD be contacted for assistance with achieving water quality go L /7.1 Signatures L The signatures of the environmental professionals involved in the preparation of this report can be Lfound at the front of this package. /8.0 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 we excavated our test holes and performed the percolation tests. It was assumed that the test holes and percolation test results are representative of the subsurface conditions in the general area. L Our professional services were performed,our findings obtained,and our conclusions proposed in accordance with generally accepted engineering principles and practices. This warranty is in lieu of all other warranties either expressed or implied. Test findings and statements of professional Lopinion do not constitute a guarantee or warranty, expressed or implied. 10 L L