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EFFLUENT FILTERS Septic tank effluent filtration technology has significantly improved over the last decade. Effluent filters should be placed on the outlet tee of all newly installed septic tanks, whether four tanks are installed ahead of the existing lift stations, or one single large tank is installed. Filters can be installed with an alarm system so that when the filters become plugged,an audiolvisual alarm sounds. Cleaning procedures would be to wash off the screens over the first manhole, nearest the inlet. Consequently, a water hose must be available nearby. The cleaning schedule is a function of the screened volume of particulate matter and is of course,unknown at this time. During the harvest times ofthe year when there will be the greatest number of people, it is to be expected that maintenance procedures will have to be performed on a wgCkly hnsis. or sooner. This would also include observations of the entire wastewater management system. CONCLUSIONS In deciding whether to install four separate septic tanks ahead of each lift station, or to install one large central receiving tank,the following factors should be considered in addition to cost: Logistically, it may be difficult to match the invert of the building sewer lines and the invert of the four lift stations, with the septic tank set in-between these two elevations,particularly for the Dry Goods Building. Additionally, removal and replacement of asphalt or concrete at three of the Cour locations is another added expense. The following Chart illustrates basic cost differences between installing four tanks vs. installing one large tank: I APPROXIMATE BASIC COSTS FOR THE APPROXIMATE BASIC COSTS FOR THE INSTALLATION OF FOUR SEPARATE INSTALLATION OF ONE 8,000 GALLON SEPTIC TANKS: CENTRAL RECEIVING SEPTIC TANK (1,200, 1,200,2,500 AND 3,500 GALLON) s 2- 1,200 gallon fiberglass tanks . . . . . . . $14,300 1 -8,000 gallon fiberglass tank . . . . . . . . $12,500 Tank Anchoring Straps/Deadman(2) . . . . $3,700 Tank Anchoring Straps/Deadman . . . . . . . $4,500 Tank Installation(2) . . . . . . . . . . . . . . . . . . $4,000 Tank Installation . . . . . . . . . . . . . . . . . . . . $4,000 1 -2,500 gallon fiberglass tank . . . . . . . . . $9,200 Tank Anchoring Straps/Deadman . . . . . . . $2,600 Tank Installation . . . . . . . . . . . . . . . . . . . . $2,000 I -3,500 gallon fiberglass tank . . . . .. . . . $9,500 Tank Anchoring Straps/Deadman . . . . . . . $2,800 Tank Installation . . . . . . . . . . . . . . . . . . . . $2,000 TOTAL . . . . . . .. . . . . . . . .. . . . . . . $50,1100 TOTAL .. . . . . . . . . . . . $21,000 LL Page 6 of 7 Chesney Consulting I