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~ -4- P!fiSICAL iLND CHEHICAL r,1E?I-iGDS Work d~ring this period was a contin~~tion of the procedures and schedules carried out in 19'53 and ',ras performed at fifteen locations throughout t~e reservoir. Most stations were identical to those used in 1963 and are detailed in Figure 2. Water te:nperature profiles and ~ater chemical sa;r.ples \-iere ta~en each mo::th except in April when ~eather in~er- fered and during Septemoer, October, and November due to mechanical troubles on the \'iork boat. Chemical series 'dere performed in mucn the same pG.ttern as the previous year. Sam?les \,jere obtained from near the surface, bottom, in the ther~ocline, and ~here temperature patterns indica~ed that additional sa~ples would be desirable for a better understanding. C~emical analyses were conducted in accordance with standard techniques employed in the fisheries field. In addition, in December selected sa:nples were sent to an accredited laboratory for analysis of nitrates, phosphates) total organic solids) and ash CO:1tent. The results of these analyses are preseYlted in Table 2. Chemical tests performed at project headquarters or in the field i:1cluded dissolved oxygen, pH, bicarbonal.e ,-u:d carbonate alkaliYii ty, and hardness. Caroon Dioxide Has determined by n0:71oGraph. A limged number of secchi disk readings .,{ere n:ade durin,; U.,e year. Also a limited nU;'1ber of nitrate and ptosphate deterr:rinat ions \-;ere G'lade using equipment available in the field. Determination of these ions with this type of procedure has been ge~erally unsatisfactory, ho,:e~er, and only the resul~s obtained by ccmme~cial means are presented he~e. RESULTS ....1,..0.' ,..~- f t d "- .. d ..... s ::; +"t".rou;:.n' 1-( a'.,_d ::'u-';',~o'" or his a,-ayeararepresen~e ini.'ib-ure -' ~ ~ Tables 2 and 3. A complete .profile of t~e major chemical constituents is given for t~e months of JU!'1e, August, and January in Figures 5-17.