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0.0933 in/yr (62 mg N/L) (1 - 0.25) + (9.5 in/yr x 0.1 mg/L) Nr = (0.0933 in/yr + 9.5 in/yr) Nr = 0.55 ppm as nitrate -nitrogen (NO3-N) C.-- DISCUSSION OF THE EXISTING SEPTIC SYSTEMS In accordance with the request by EHD, the following information describes the apparent operations of the existing septic system that serves Building G, and at one point in time, the Silos: An influent tightline exits Building G and connects with the existing septic tank. There is evidence for this line because the asphalt (AQ had been cut at some point in the past tracing the line to the tank. Another tightline comes in from a toilet and sink located in the Silos. However, the influent tightline from the second floor fixtures is exposed near the Silo exit with the piping exhibiting severe corrosion. Therefore, these Silo fixtures cannot be used until the influent line is completely replaced. It is assumed that each of these two influent lines come into the sides of the septic tank. The size of the tank is unknown, as is the leachfield managing the effluent from this tank. It is assumed the leachfield, of unknown construction details, extends to the north from the tank. IV. SEPTIC SYSTEM OPERATIONAL PARAMETERS AND COMPONENTS A. PROPOSED SEPTIC SYSTEM COMPONENTS AND OPERATIONAL PARAMETERS TO SERVE BUILDINGS G, B, C, F, H, I. SSS§ 3.7. The design of the pressurized filter bed disposal system for Building G is based upon the factors for efficient operation, disposal field longevity, and environmental protection. An overview of the system operation to serve Building G is as follows: the ADA components are depicted on the Site Plan prepared by the architectural firm of Ware-Malcomb: The existing septic stank must be destroyed under EHD permit since it is most likely more than 60 years old and probably structurally unsound. Influent lines from the retrofitted Restrooms in Building G and from the Silos will be connected to a new 2,000 gallon, two compartment septic tank. Effluent will gravity from this tank into a 1,250 gallon tank directly adjacent to the south. The second compartment of this tank will be the pump chamber with a BioTube® filter vault. A duplex pump system will pressurize the effluent for both transport and disposal. Pumping will be on -demand and not timed -dose. The filter bed will be constructed to the southeast of Building G. Effluent will be pressurized through seven laterals for equal effluent distribution orientated within a filter bed disposal arrangement. The 100% reserve replacement area is denoted on the Site Plans and is directly north of the primary filter bed. Page -8- rhocHov rn"Vyflt;.n