8/5/2010 SEWER COMMISSION Minutes

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28,000 gpd, with the average annual flow around 12,000 gpd. These figures are 80% and 35%, respectively, of the permitted flow. The average annual flow at buildout is estimated to be 21,000 gpd. Table 6-11 shows the effect that existing peaking factors would have on the estimated buildout flow. TABLE 6-11 STRATFORD PONDS PEAKING FACTORS Maximum Month Peak Day Peaking Factor 1.3 2.4 Estimated Future Flow(gpd) 28,000 51,000 Note: Peaking factors are based on flow data from October 2004—October 2005 and are the ratio of maximum month or peak flow to average annual flow. Although the estimated peak day for buildout conditions is approximately 70% -higher than the permitted flows, this can likely be attributed to the seasonal nature of the existing residences. As the current residences convert to year round use, peaking factors may decrease. Based on the permitted flow and existing data, it appears that the Stratford Ponds WWTF is currently operating close to its flow capacity. An additional factor that would make expansion of this plant less feasible is the location of the WWTF within a Zone II. Permits for additional capacity would likely require that a higher level of effluent treatment be achieved. This may require treatment processes beyond what is currently used. Design and permitting for the relocation of the leaching area is currently underway. The relocation will move the leaching area out of the Zone II area and is being done as an alternative to WWTF upgrades that would be required by MADEP if the leaching facility remained in the Zone II area. Performance. The AmphidromeTI facility at Stratford Ponds operates under discharge permit No. 382. These permit limits are displayed below along with the average annual influent and effluent wastewater characteristics: i i Allashpee Server Commission Filial Needs Assessment Report, t'Stearns�\Vp,,,-d ,e..0 ,�� rmronnnrnl;+1 kuflmeera ena St7ennsts � 00074.7 6-28