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<br /> <br />-, <br />i:.. '-'L. <br /> <br />It <br /> <br />:\lETR(II'IILIT__\;'; W_\TER DI-"THICT <br /> <br />. <br /> <br /> <br />- - <br /> <br />_..~:se'_. .. <br />-......... . <br />-- <br /> <br />- ..... ----..- <br /> <br /> <br />f.a/':r .\JfltJH'U'S <br /> <br />Chemical control of the quality of water Tll1lilltained throllKhout <br />the ~()ftt'ning JlrOCI~SS rl.-ocluirt'd tht, partial an;dysis of approximatl'ly <br />11,000 sam pit,S takt'll at mrious shlj.(t's in the prOt'ess. In addition. <br />1-16.1 samples wen' t:lken at the plant for hacteriologic..1 t'x;:tmiIlH- <br />lioll. From point... in the di"tributioll system i02 samples were taken <br />for chemical analysis and 5663 samplt's were collt'(,tl'd for sanitary <br />{'ontrol. The Obsl'r\"ation ,and control of plankton growth~ in the <br />'-arious District rest:'r\'oirs rt'1luired the microseopic~d l'xamination <br />of 14:31 samples. In addition to the usual pradict, nf spot trt'atment <br />with COPlwr sulfat.' to control :,cattl'red growths. a general treat- <br />ment of Lake )[:lthew:, wa:, 11t~('e:,sarr in Januarr 19.18 when a :-:eri- <br />ou:-: dil'trihution of dilltom:-: and protozo:l de\'c]o!,ftl throughout thl" <br />reservoir. <br />The results of iJal'terio]ogil'll] examinations of Colorado Hin-r <br />wat('r 3re gi\"lm in tab]l' 10. Although the numher of positive tubes <br />from natural Colorado Rin-r water :<hO\H'f1 an increa"t' over pn-. <br />viotl:"! years. the complett'd positiw tubes in per cent of total 10 mL <br />tubes pl:UJtt'd was ]t'SS than for the prl'Ceding tl:<.cal rear. ~o positi\'t~ <br /> <br />