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07 Septmber 2021 <br />Project No. 21-6531 <br />Page 14 of 14 <br /> Avoid use of bioattenuation chemicals (bleach etc.). <br /> Properly and regularly maintain the property septic system. <br /> Use EHD criteria for sizing the septic disposal field. <br /> Utilize an advanced treatment system to reduce nitrate loading and the percolation <br />rate. <br /> <br />If re-location or expansion of leach fields becomes necessary, leach lines should include <br />high organic substrates under and surrounding the lines installed. <br /> <br /> <br />12.0. CONCLUSIONS AND RECOMMENDATIONS <br /> <br />Based on this Soil Suitability and Nitrate Loading Study, AGI concludes the following: <br /> <br /> The percolation rate meets the minimum EHD standards in the proposed septic <br />system disposal field. <br /> The nitrogen loading rate is slightly above the desired value of 10 ppm. <br /> Nitrates were detected below the State of California Maximum Contaminant Level <br />(MCL) in the onsite water well. <br /> DBCP was detected at a concentration slightly above the State of California MCL <br />of 0.2 mg/l. AGI recommends collecting an additional water sample from the onsite <br />water well to confirm the DPCP concentration detected. <br /> AGI recommends installing a standard septic system that meets the EHD Onsite <br />Wastewater Treatment System Standards. <br /> <br /> <br />13.0. LIMITATIONS <br /> <br />Our professional services were performed using that degree of care and skill ordinarily <br />exercised by environmental consultants practicing in this or similar localities. The findings <br />were based on field testing results. Evaluations of the hydrogeologic conditions at the site <br />for the purpose of this investigation were made from a limited number of available data <br />points (i.e., test hole and field data) and subsurface conditions may vary away from these <br />data points. No other warranty, expressed or implied, is made as to the professional <br />interpretations, opinions and recommendations contained in this report.