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January 3, 2006 <br /> NOA Project Number: E05164A <br /> 1200 gal+ 1070 gal= 2,270 gals <br /> Calculation: CTC x SF—'LL (feet of equivalent leach line) <br /> 2,270 gals x 0.200 = 454 feet equivalent leach line <br /> 0 Filter Bed Factor(FBF):3 (for sandy soils) <br /> LL x FBF =Area of Filter Bed(Square Feet (SF)) ✓ r <br /> 454 feet x 3 = 1,362 SF <br /> Improved Treatment <br /> Additional Recommendations For Im <br />� p <br /> Place 4 inches of loose plant compost or peat in the bottom of the falter bed <br /> `- Increase Area of Filter Bed By 25%to adjust for compost and Peat <br /> 1362 x 1.25 = 1,702 square feet(recommended filter bed sie) <br /> Increase tank size to 3200 gallons(use two 1600 gallon septic tanks in series) <br /> Retention Ratio 428 gallonsl3,200 gallons = 7.5 ratio (428 gallons from section 3.4.1) <br /> IJ <br /> 5.0 CONCLUSIONS AND RECOMMENDATIONS <br /> Our office concludes that the Site is suitable for development with the use of modified filter bed <br /> sel2tics stem as discussed in Section 4.2 Methods of Miti ation. Though the standard septic <br /> systems are `.`improved" to enhance treatment, it is difficult to quantify the denitrification capacity of <br /> these systems.: With improved nitrification in the tank and denitrification within the tank and <br /> I disposal field,we would estimate on the order of 10 percent increase in overall denitrification when <br /> compared to standard systems. All septic system construction should follow the San Joaquin <br /> F! County On-Site Wllastewater Disposal Standards where applicable. We estimate with the use of a <br /> modified filter bed system, the additional 10 percent reduction in nitrogen will bring the predicted <br /> F1 Nc number of 10.6 mg/L-N to below 10 mg/L-N. <br /> We would also recommend the well not be use for drinking water since the water quality test <br /> indicates levels of nitrate above the MCL for drinking water. Potential repair options for the well v <br /> should be discussed with the EHD. <br /> 5.1 Signatures <br /> als involved in the preparation of this report can be <br /> The signatures of the environmental profession <br /> found on the cover sheet at the front of this package. <br /> 5.2 Attachments <br /> FtAll required attachments and appendices can be found at the rear of this package. <br /> 7 <br />