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December 14, 2005 <br /> NOA Project Number: E05079B <br /> Page 3 <br /> Table 1. <br /> Summary of Percolation Tests. <br /> Test No., Percolation Percolation Rate Test Comment <br /> Date Tested Test Depth(ft) (minutes/inch) Duration (see notes) <br /> P-1 shallow, 8-5-05 3.50 6.4 4 hours Test Passed <br /> P-2 shallow 8-5-05 3.40 4.9 4 hours Test Passed <br /> Note: A satisfactory percolation rate for a"shallow"test is less than or equal to 60 minutes per inch. <br /> The soils within the sewage disposal areas have demonstrated a satisfactory percolation rate in <br /> accordance with the requirements of the END for the use of a standard septic system. <br /> Septic System Sizing <br /> Septic System Construction should follow the San Joaquin County On-Site Wastewater Disposal <br /> Standards where applicable or other engineering recommendations. <br /> Nitrate Loading Study Update <br /> A new nitrate loading calculation was performed using the HantzschelFinnemore equation <br /> (Hantzshe N., Finnemore, E.J. 1992,Predicating Ground-Water Nitrate-Nitrogen Impacts. <br /> Ground Water, Vol. 30,No. 4.) and many of the assumptions presented in the Chesney <br /> Consulting report dated August 1, 2004 for the subject property. Basically, all the assumptions <br /> were used however the 53 mg/L-N originally used in the report appears to be conservative. The <br /> total nitrogen in domestic waste water effluent ranges between 20 to 80 mg/L-N with 35 to 45 <br /> being typical (Crites, R., Tchobanoglous, G., 1998, Small and decentralized wastewater <br /> management systems: McGraw-Hill series in water resources and environmental engineering, <br /> McGraw-Hill Boston first edition). For the purposes of this report, 53 mg/L-N will be utilized <br /> however it may be regarded as fairly conservative when utilized with a new water well having <br /> fair to good water quality. <br /> The nitrate loading study update for two parcels whose sizes are the 1.81 (Parcel 1) and 2.68 <br /> (Parcel 2). The following assumptions are used for the nitrate loading analysis.: <br /> — 8 people per house,two houses per parcel, 68 gal/person/day, 544 gpd waste water <br /> t total. <br /> —9 inches per year rain fall <br /> —53 mg/L-N concentration of total nitrogen in effluent <br /> —0.1 mg/L-N concentration of total nitrogen in rain water <br /> —3 5 % denitrification <br />