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BSK Job E21-002-01B <br />July 13, 2021 <br />Page 18 <br />Nitrate Loading Analysis <br />2482 Carpenter Road <br />Stockton, California <br /> <br />4.6 Impact of Nitrogen Loading from Site Project to Downgradient Wells, Rivers, etc.: <br />The impact of nitrogen loading from the site should not change to down gradient wells, river, lakes, etc., <br />due to the fact the amount nitrate-nitrogen containing recharge from the adult care facility should not be <br />changing. The site project is replacing the current septic/leech line system with a commercial septic <br />system. <br /> <br />5. DISCUSSION OF NITRATE LOADING RESULTS RELATIVE TO PROPOSED METHOD OF <br />WASTEWATER DISPOSAL <br /> <br />5.1 Total Nitrate Impact from Proposed Project: <br />The impact of nitrogen loading from the site should not change since the adult care facility, which is the <br />producer of the nitrate-nitrogen containing recharge water that is discharged to the onsite system, should <br />not be changing. The number of residents and staff that are currently occupying the adult care facility is <br />not anticipated to change for this site project. The site project associated with nitrogen loading is related <br />to the replacement of the existing septic/leech line system with a commercial septic system. The <br />expansion of the electrical substation on the southern portion of the site is not expected to contribute to <br />nitrogen-nitrate loading from the site. <br /> <br />5.2 Proposed Mitigation Methods for Nitrate-Nitrogen to Soil and Groundwater: <br />In areas where nitrate-nitrogen containing recharge water is too high a Fujiclean pretreatment system has <br />been recommended. Some of the details regarding the specifications of a Fujiclean CEN21 model as well <br />as the anticipated nitrate-nitrogen load reduction specific to the site can be found below: <br />Nitrate-Nitrogen Pretreatment system is a Fujiclean CEN21 model <br />The Fujiclean Tank volume is 2,550 gallons <br />Will treat 1,900 gpd of black water <br />Provides 70-75% nitrogen reducing ratio based on National Science Foundation data <br />Installation location updated on plans (Appendix A) <br />The Fujiclean CEN21 system is estimated to reduce the nitrate-nitrogen concentration of the <br />recharge water by 70-75% based on manufacturer's specifications and National Science <br />Foundation data. Based on these findings an estimated nitrate-nitrogen concentration using one <br />Fujiclean system should between 5.9 mg/L and 4.1 mg/L in the recharge water. This value should <br />be confirmed by the manufacturer after they design a system specific to this project.