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F, BOOK 64 Ff+uC 35 Mr. Greenfield's letter states his pump station operation costs are based on estimated use and use of the normal Florida"Power and Light rate for one year. Since he estimated use, and used normal FP&L rates,.__ his cost figures showing the Rainbird-system.being cheaper to use may - not be accurate.. One; 25 horsepower and two, 60 horsepower motors operating 7 days per week, 10 1/2 hours per day, operates.a total of 318 hours per. month (30 days); 242 hours of off-peak rate with 75 hours of on -peak rate. The Toro'system, using one, 25 horsepower and two, 75 horsepower motors operating 6 days per week, 10 hours per day, operates a total of 259 hours per month; 207 hours of off-peak with 52 hours of on -peak. Since the Toro system runs for less hours per day, and in turn less hours per month, it is able to fit more of its running time into the off-peak operating rate.` This makes the Toro system cheaper to operate. The last item I would like to address is head spacing. I would like to clarify the spacing in the critical single row areas for each system. The Rainbird heads are spaced between 65 and 80 feet on center and they put out 41.5 GPM. The Toro heads are spaced between 70 and 80 feet on center and put out 60 GPM. In conclusion, we believe the strength of the Toro system over the Rainbird system is that it puts out more gallons per minute. (All grass knows is how much water it is getting!) Respectfully submitted, LINKS DESIGN, INC. rpma C... OW� - BRUCE C. SHELDON ASSOCIATE Chairman Scurlock asked the architect to make his presenta- tion in support of the Toro system and stated he would then give the representative from Rain Bird the opportunity to reply. Bruce Sheldon of Links Design presented the following comparison of operating costs, emphasizing that they are based on Time -of -Use rates and on both systems operating at full capacity. 66