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Gooderham, Aaron [EHD] <br />From: Gooderham, Aaron [EHD] <br />Sent: Monday, October 10, 2022 1:23 PM <br />To: Brian Millman <br />Subject: RE: 16402 Escalon Bellota Road, Escalon - Azevedo Prop <br />Dear Brian, <br />I am working on the SSNL for this property. You use 45 ppm for the NW value (wastewater concentration of nitrogen); I <br />would accept 35 ppm for residential use. <br />You use 40% for denitrification; this value is too high. In a clayey soil we would accept a max denitrification value of 30%. <br />Unless you can provide a source that has found 40% denitrification in onsite waste water treatment to be accurate. The <br />original Hantzsche-Finnemore study uses 25% denitrification but we have accepted 30% in the past in clayey soils, which <br />are found in this area. <br />After I changed these values the long-term nitrate loading is 14.53 ppm. This is above our tolerance for long-term nitrate <br />loading so a nitrogen treatment system will be required here. Let me know if you have any questions, <br />Aaron Gooderham — REHS <br />Environmental Health Department — County of San Joaquin <br />Website: https://www.sigov.org/department/envhealth/ <br />Main Line: (209) 468-3420 <br />From: Brian Millman <bmillman@advancedgeo.biz> <br />Sent: Monday, September 19, 2022 9:44 AM <br />To: Gooderham, Aaron [EHD] <aooderham@sjgov.org> <br />Subject: RE: 16402 Escalon Bellota Road, Escalon - Azevedo Prop <br />Got it! Thanks for the quick reply. <br />AdvancedG eo <br />An Employee -Owned Company <br />Brian Millman <br />Senior Geologist <br />CA Professional Geologist No. 5574 <br />OR Registered Geologist No. G2663 <br />CA QSP/QSD No. 26882 <br />AdvancedGeo, Inc. <br />Environmental • Compliance • Industrial Hygiene • Geotechnical <br />Phone: 800-511-9300 <br />Fax: 888-445-8786 <br />bmillman(d-)advancedgeo. biz <br />www.advancedgeo.biz <br />