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r, . c. ,~ 4" -6~ f: R ,\ T I () N Ai': n ~I A I N TEN ,\ NeE 21 l leaks in concrete siphons, remove sand from sand traps. repair and maintain automotive and maintenance equipment. and insure the delivery of clean wholesome water to the terminal reservoir at Lake l\fathews. The regular cl'ew \vas assisted as necessary at the westerly end of the aqueduct by distribution system forces. Protection of the qual it;, of water was of prime concern to all main aqueduct forces, Reservoirs were periodically inspected, sampled, and spot treated with copper sulphate when necessary. Water standing in canals and pumping plant forebays during periods when there was no flow through the aqueduct was sim. i1arly inspected, sampled, and treat.ed as required. A considerable amount of sand and debris was blown into the canal during the year, This material was effectively retained in the sand traps which were cleaned out periodically by washing the sides with a pressure pump and hose and scraping the bottoms. A truck crane was used to remove the sand and debris from the traps. Box siphons were flushed clean by alternating the flow between the three barrels, These operations insured desirable water c011(li- tions in the aqueduct syst.em throughout the year. Patrol roads were graded and repaired as required to maintain them in good serviceable condition, Minor damage to roads result. ing from summer rain storms was repaired during August and September, Drainage conditions across the aqueduct line were improved at Freda siphon, West Fan Hill siphon, East Thermal siphon, and along the section of conduit between Cottonwood and Mecca Pass tunnels, Rain storms caused no se,';ous damage to facilities, the ,rainfall ~ _being _weJI_distrib.utecl _bgtl\''Ce.!1 }yl;' a.!1<!. April. The rainfall re- corded at Iron Mountain, headquarters of the ~";-ed";-ct mairrtenance- . crew, amounted to 1.88 inches compared to 1.96 inches in the pre- ceding year, At Gene the annual rainfall was 3.53 inches, at Eagle Mountain 1.48 inches, and at Hayfield 3.47 inches. The 12'4" diameter cilTular monolit.hic reinforced concrete Freda siphon again developed lcaks at shrinkage cracks when cool water was passed through during the winter months. Inspection of the interior of the siphon disclosed that new cracks had developed and some of the 'previously repaired cracks had reopened, All visible cracks were repaired during March and the early part of April. Hair line cracks were buffed wit.h a wire brush and painted with a special liquid and plastic resurfaceI', All other cracks were chipped to a depth of about two inches, calked with lead wool and I, I