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COSTS OF DISPOSING OF NEW YORK CITY SLUDGE AT 106 -MILE SITE 



Sludge Production by NYC Sewage Treatment Plants 



NYC Estimate = 117 mcf/yr 



1982 Actual Production = 101.8 mcl/yr 



Summer production =2.58 mcf/week x 101.8/117 =2.24 mcf/week 

 Winter production = 1.91 mcf/week x 101.8/117 = 1.66 mcf/week 



Capacity of City Vessels 



3 vessels = 4 vessels minus 25% downtime 



Miles per roundtrip = 2 x (101 miles + 30 miles) = 262 miles 



262 miles/roundtrip „ , ,. 



12 miles /hour + 2 hours loading time = 



23.8 hours round trip time, including loading 



24 hours /day x 6 days /week 

 24 hours/trip 



6 round trips /week/ vessel or 18 trips /week, 936 trips/year 

 936 trips/year x 84,000 cf/trip = 78.6 mcf/year or 1.51 mcf/week 

 Total capacity of present city fleet = 1.51 mcf/week 

 Volume to be Disposed of by Private Barge 



Winter production 1.66 mcf/week - 1.51 mcf/week 



shortfall x 26 weeks 3.90 mcf 



Summer production 2.24 mcf/week - 1.51 mcf/week 



shortfall x 26 weeks 18.98 mcf 



Total production 22.88 mcf 



Costs for Disposing by Private Barge 



22.88 mcf x $0.11/cf = $2.52 M 



22.88 mcf x $0 . 16/cf = $3 . 66 M • $ 2 .52 M - $ 3 .66 M 



Costs of Marine Personnel $ 2.28 M 



Costs of Repair, Maintenance, Supplies $ 1.60 M 



