N.M. Admin. Code § 20.7.3.603
Current through Register Vol. 35, No. 23, December 10, 2024
Section 20.7.3.603 - DESIGN; TERTIARY TREATMENT STANDARDSA. Tertiary treatment systems shall provide total nitrogen (TN) removal in addition to secondary treatment.B. For lots that exceed the allowable hydraulic loading pursuant to Subsection C of 20.7.3.301 NMAC, a department approved tertiary treatment unit may be installed. The treatment unit must be capable of removing TN to a concentration equal to or less than the concentration limit calculated pursuant to Subsection C 20.7.3.603 NMAC.C. Utilizing the standard loading equation, (flow (gpd) X conc. (mg/l) X 8.34 lbs./gal. X 365 days/yr)/ 1,000,000 = lbs./yr/ac., and assuming an average of 60 mg/l of TN in the septic tank effluent and a maximum flow of 500 gpd/ac, the following simplified equation shall be used for determining the required TN concentration allowed for a specific lot size: total nitrogen concentration (in mg/l) = [lot size (in acres) / design flow (in gpd)] x 30,000.D. The treatment unit shall be operated in accordance with the manufacturer's specifications and department approval conditions.E. Total nitrogen effluent testing, when required pursuant to Subsection C of 20.7.3.901 NMAC, shall meet the concentration limit calculated pursuant to Subsection C of 20.7.3.603 NMAC.N.M. Admin. Code § 20.7.3.603
20.7.3.603 NMAC - Rp, 20.7.3.603 NMAC, 9/1/13; A, 9/1/13Amended, New Mexico Register, Volume XXV, Issue 15, August 15, 2014, eff. 9/15/2014