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Effective April 28, 2015 Chapter Four Subsurface Sewage Treatment System Regulations <br />12.10 Infiltration. <br />The design flow for MSTS must also include 200 gallons of infiltration and inflow per inch of collection pipe <br />diameter per mile per day with a minimum pipe diameter of two inches to be used for the calculation. Flow values <br />are allowed to be further increased if the system employs treatment devices that are exposed to atmospheric <br />conditions that will infiltrate precipitation. Flow estimates as calculated in this Chapter shall not be relied upon for <br />the design of collection systems. <br />12.11 Waste Concentration. <br />If concentrations from the sewage are expected to be higher than 170 mg/L BOD (or 125 mg/L of CBOD5), 60 <br />mg/L TSS, or 25 mg/L of oil and grease,, or if the design is for an Other Establishment or MSTS, an estimated or <br />measured average concentration must be determined and be acceptable to the Department. System design must <br />account for concentrations of these constituents so as to not cause internal system malfunction, such as, but not <br />limited to, clogging of pipes, orifices, treatment devices, or media. <br />47 Washington County Development Code <br />