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February 15,2006 NOA Project Number: E06006A 4.2 Methods of Mitigation Because the proposed use shouldnot cause a buildup of nitrates in the groundwater above the safe drinking water standard, no mitigation measures are warranted for nitrate control. However, to mitigate the fast percolation rates reported in the SSS,we would recommend use of a modified filter bed septic system. The modified filter bed should'contain approximately,four.inches of loose compast`or peat'to provide a car bon`sourceand slow-the-percolation rate. The remainder of the system should follow standard EHD design procedures. 5.0 CONCLUSIONS AND RECOMMENDATIONS Our office concludes that the proposed project is suitable for development with the use of a modified filter bed septic system.:.All septic system construction should follow the San Joaquin County On-Site Wlastewater Disposal Standards where applicable. We recommend the existingdomestic well not be used for drinkin water since the water quality test g q ty indicates levels of nitrate above the MCL for drinking water. Potential repair options for the well should be discussed with the EHD. 5.1 Signatures The signatures,of the environmental professionals involved in the preparation of this report can be found on the cover sheet at the front of this package. 5.2 Attachments ® All required attachments and appendices can be found at the rear of this package. 6.0 LIMITATIONS v Out.professional services were performed, our findings obtained, and our conclusions proposed in accordance with genezally accepted engineeringprinciples 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. 7