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28 September 2022 Project No. 22-6994 Page 15 of 15 AdvancedGeo An Employee -Owned Company • Maximize wastewater hold time where practical (retention) by installing a larger septic tank (2,000 gallons). • Avoid use of bioattenuation chemicals (bleach etc.). • Properly and regularly maintain the property septic system. • Use EHD criteria for sizing the septic disposal field. If re -location or expansion of leach fields becomes necessary, leach lines should include high organic substrates under and surrounding the lines installed. 12.0. CONCLUSIONS AND RECOMMENDATIONS Based on this Soil Suitability and Nitrate Loading Study, AGI concludes the following: • The percolation rate meets the minimum EHD standards in the proposed septic system disposal field. • The nitrogen loading rate is above the desired value of 10 ppm. • Installation of a septic tank that is larger than the minimum requirement to offset the elevated nitrate loading rate. • Nitrates were detected above the State of California Maximum Contaminant Level (MCL) of 10 mg/I in the onsite water well-, DBCP was not detected above the laboratory reporting limit. • All approved septic system use should follow the EHD Onsite Wastewater Treatment System Standards. 13.0. LIMITATIONS Our professional services were performed using that degree of care and skill ordinarily exercised by environmental consultants practicing in this or similar localities. The findings were based on field testing results. Evaluations of the hydrogeologic conditions at the site for the purpose of this investigation were made from a limited number of available data points (i.e., test hole field data and water data) and subsurface conditions may vary away from these data points. No other warranty, expressed or implied, is made as to the professional interpretations, opinions and recommendations contained in this report.