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<br />il <br />II <br />II <br />II <br />II <br />II <br />~ <br />II <br />II <br />II <br />II <br /> <br />On a cursory inspection of this se5ment of line conducted in August, 1972, <br /> <br /> <br />approximately 25 leaks were observed most of which were small but one was <br /> <br /> <br />sizeable amounting to 2-300 gpm (See Exhibit No.5, page 2). Approximately <br /> <br /> <br />60% of this 3.4 mile segment is exposed and suceptable to damage by rock <br /> <br /> <br />slides. The City estimates 5-6 breaks in the line per year are caused by <br /> <br /> <br />rock slides. On this segment of line there are over 30 trestles varying in <br /> <br /> <br />length from 10' to 1600'. The majority of these trestles are wooden, but <br /> <br /> <br />there are a small number of steel truss trestles. Over half of these trestles <br /> <br /> <br />are in poor condition and in need of repair. Exhibit No. 5 shows the <br /> <br /> <br />precarious nature of this wooden line. During the summer months the City <br /> <br /> <br />carries out a continuous maintenance program on this segment of line. <br /> <br />If this raw water transmission line is to be used on a continuing basis in <br /> <br /> <br />the future, it has been estimated that 1 1/2 miles of this wooden line will <br /> <br /> <br />have to be replaced over the next 20 years. <br /> <br />The capacity of this raw water line is 11.3 mgd which is sufficient to <br />supply the maximum day demand throu~h 1975 and the average day of the peak <br />month through 1982. <br /> <br />II <br /> <br />The existing pump station can operate satisfactorily as presently installed <br /> <br /> <br />during the summer months but during the winter months the Hydraulic Ditch <br /> <br /> <br />must be kept free of ice to provide a water source to the pump station. <br /> <br /> <br />The only time the pump station woulJ be required to operate during the winter <br /> <br /> <br />would be during emergencies when the raw water line was out of operation. <br /> <br />II <br /> <br />I <br /> <br />The existing pump station can be used in conjunction with the raw water <br /> <br /> <br />transmission line to supply the treatment plant. The present pump station <br /> <br /> <br />capacity of 10.6 mgd plus the raw water line capacity of 11.3 mgd totals <br /> <br /> <br />21.9 mgd. The combined capacity is sufficient to handle the maximum day demand <br /> <br /> <br />through 1994 and the raw water line would be capable of handling the total <br /> <br /> <br />demand by itself except during the three summer months of high demand. On <br /> <br /> <br />the other hand, if the raw water line becomes inoperative for any reason, the <br /> <br /> <br />pump station must be capable of handling the maximum day demand by itself. <br /> <br /> <br />The existing pump station capacity of 10.6 mgd is sufficient to handle the <br /> <br /> <br />maximum day demand through only 1974. To handle the 1993 maximum day demand <br /> <br /> <br />of 21.5 mgd the pump station would have to be expanded by 10.9 mgd. <br /> <br />II <br /> <br />rl <br /> <br />J <br /> <br />1 <br /> <br />1 <br /> <br />3-3 <br />