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I i I ~ .- 1-.' q l.t;;l , ;; OPERATION AND M^INTENAN~E 21 a low \vater temperature of 850 F was measured. During January H149, about 45 cracks in Freda siphon leaked an estimated 205 gallons per minnte; the siphon at mile 18.30 leaked up to an esti- mated 24 gpm; six cracks in West Wide Canyon siphon leaked 40 gpm; and flow from old an(l new cracks in Lakeview siphon reached an estimated 320 gpm, The dumping of sawduot in these siphons- 60 sacks in Freda, 23 sacks at mile 18,30, 25 oacks at West Wide, and 50 sacks at Lakeview-wa~ sllccessful in stopping many of the leaks and reducing the flow from others temporarily, There was no opportunity during the fiscal year to do any rEpair work from the inside of the siphons. Five leah on Lakeview siphon which did not respond to the ,,"wdust treatment were calked from the out- side with lead wool. with concrete collars placed around the pipe at two of the locatiuns. By the eud of March 1949, the temperature of the flowing water had increased sufficiently to reduce all leakage to negligible quantities, On the evening of July 22, 1948 there was a heavy downpour of rain along the aqueduct, 1.10 inches being recorded at Iron Mountain. There was no damage to the aqueduct, but the trans- mission patrol road and telephone patrol road from Iron Mountain to Danby Dry Lake were washed out in several places and several drainage ditches on the Eagle Mountain access road were filled with sand. The necessary repairs and clean-up work were performed promptly, A sharp earthquake shock occurred on December 4, 1948, but a thorough inspection of the aqueduct revealed no damage; however, six cracks with some leakage were observed in the West Wide Canyon ~iphon. Special safety precautions were taken during the year to remove potential sources of accidents to the public on District property, An old test pit at Fan Hi\! w'" tilled in. Two wells in Little Mo- fango and Morongo Canyons were capped with 6-inch concrete slabs. Three openings into old transformer \'aults at Cabazon were covered with 6-inch slabs of concrete. 111 the vicinity of Potrero two 10-inch well casingo were capped by welding metal bonneto over them. and similar caps were welded on old wells in the vicinity of Valverde tunnel shafts 3 and 4. At Yellow Canyon adit and Hayfield No.1 tunnel adit the portal timbering was pulled do\\'n and the entrances were completely buried with rock and earth, All construction camp ceS"p0018.- investigation test pits, and explosives magazines that could be located'along the aqueduct were filled,