Chemical Tests 



Con^lete quantitative chemical analyses 

 for all the constituents present in the 

 water were not made. Determinations were 

 made for certain chemical characteristics, 

 dissolved gases, and metcillic ions which 

 adequately define the water quality. Spe- 

 cifically, tests for dissolved oxygen, 

 carbon dioxide, pH, hardness, alkalinity, 

 sulphates, ammonia, and total solids were 

 Ccirried out. They also were made in accord- 

 ance with "The Standard Methods for the 

 Examination of Water, Sewage and Industrial 

 Wastes", tenth edition. In addition, 

 selected seasonal samples were einalyzed by 

 a commercial testing laboratory for iron, 

 copper, aluminum, calcium, magnesium, 

 sodium, potassium, silver, meinganese, and 

 lead. 



WATER QUALITY IN THE WENATCHEE 

 RIVER BASIN 



Nason Creek (Station 1 ) 



The stream is 23 miles long and enters 

 the Wenatchee River just below Lake Wenatchee 

 at an elevation of 1,800 feet. No up-to- 

 date information on the quantity of stream 

 flow was available. 



Physical characteristics 



The physical characteristics of the 

 waters of Nason Creek are shown in tables 

 4 and 5. 



These physical characteristics are 

 plotted versus time and shown graphically 

 in figures 8 and 9. 



Sampling Procedure 



At all sampling stations two 

 separate samples were collected, and 

 two separate determinations made for 

 each physical and chemical test. 

 The results reported are an average 

 of the two determinations. Samples 

 were usually collected at mid-depth 

 from the left and right halves 6f 

 the stream. At Lake Wenatchee, a 

 boat was used to get to the sa m pling 

 point. Samples at varying depths, 

 usually 10 ft., 75 ft., and 175 ft., 

 were obtained from the lake. 



Frequency of Seimpling 



During the summer of 1954 

 samples were collected weekly from 

 Station 6, Wenatchee River at Sleepy 

 Hollow. A few rjindom samples were 

 also collected from this point dur- 

 ing the winter and spring of 1954- 

 1955. Sampling of all the stations 

 at 1- or 2-week intervals commenced 

 in June of 1955 cind continued through 

 September of the same year. Where 

 possible, monthly samples were 

 obtained from all sampling stations 

 during the winter and spring of 

 1955-1956. Severe weather conditions 

 prevented seimpling some of the sta- 

 tions in the upper valley during 

 this period. 



Table 4. — Nason Creek — Water quality, physical 

 characteristics, 1955-1956. 



Specific conductance 



(micromhos/cm at 25° C.) 



34 



17 



43 



1/ Abnormal due to heavy surface runoff and not con- 

 sidered in the average value 



Table 5. — Nason Creek — Water quality, water temperature 



1956 



11 



