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March 29, 2019 <br /> FOR: San Joaquin County Environmental Health Department(EHD) <br /> 1868 Hazelton Ave. <br /> Stockton,CA 95205 <br /> RECEIVED <br /> PROJECT: Seth Heatwole Project <br /> SR0080225 APR 0 1 2019 <br /> 12927 West Ripon Road <br /> Ripon, California 95366 ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> SUBJECT: Soil Suitability/Nitrate Loading Studies Report Addendum <br /> The EHD has questions on the Nitrate Loading/Soil Suitability Studies I conducted for the above <br /> referenced project. Each answer corresponds with the list referenced in an email on March 25, <br /> 2019, 3:54:55PM by Mr. Jeffrey Wong, REHS of EHD. <br /> 1. The first question is the source of the scientific evidence that by adding organic mater <br /> (sawdust) in the soil-effluent interface "nitrification will only occur if the C:N ratio is below <br /> 20:1." The scientific evidence for this biological function can be readily obtained by a simple <br /> Google search, and is overtly referenced in the San Joaquin County Onsite Wastewater <br /> Treatment Systems Standards in Section 7.1: "Alternative treatment systems are standard systems <br /> with additional enhancements above the required minimum to augment the treatment capabilities <br /> of the system. For example, additional septic tank capacity, additional length of leachline, or the <br /> addition of organic material under the leachline." "Engineered systems are non-standard <br /> systems uniquely designed for a specific location or locations by a Registered Civil Engineer <br /> based upon site specific information." <br /> There are several scientific papers on this process from respected scientific Journals and Books; <br /> as examples: <br /> Effect of C/N Ratio on the Removal of Nitrogen and Microbial Characteristics in the Water <br /> Saturated Denitrifying Section of a Two-Stage Constructed Rapid Infiltration System <br /> Qinglin Fang,I Wenlai Xu,1,2,3,* Gonghan Xia,2 and Zhicheng Pan3, International Journal of <br /> Research and Public Health. 2018 Jul; 15(7): 1469. <br /> https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6069465/ <br /> From one of the most respected soil science books: <br /> The Nature and Properties of Soils, 13`h Ed., Brady and Weil. pp 506-511. <br /> Page 1 of 3 <br /> ✓.C.13ax 3794 ♦ gat&&,ea 95381 t (20)4C2-1652 f ddcFie6neygch v P,%Aet <br />