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002882 . STUDY METHODS . Water quality samples were collected from all 19 stations during both the "low flow" study in Sept.-Oct., 1975 and the "high flow" study in May-June, 1975. The 200 km (125 mi) stream reach was divided into three segments because of the long distances involved, and each segment was sampled on four consecutive days during each study. Segment I covered the lower White River, including stations 1-5, Segment II included stations 6-10 plus the two Milk Creek stations, and Segment III included the remaining stations in the upper White River drainage (Fig. 1). During the "low flow" study sampling progressed downstream from Segment III during the first week to Segment I during the third week. The sampling pattern was reversed during the fo'llowing "high flow" study, with sampling occurring first in Segment I and then progressing upstream. This arrange- ment provided the greatest possibility for sampling at the desired flow conditions while minimizing the adverse impact of winter weather conditions. . . . The water quality parameters measured during this investigation are listed in Table 2. Although an attempt was made to include a wide range of parameters, it is realized that these parameters are not all-inclusive and may not satisfy the needs of everyone concerned with water quality in the White River area. . At each sampling site field measurements were made for temperature, pH, specific conductance (conductivity), and occassionally, flow. Sampling stations had been located, wherever possible, at flow measuring stations operated by the Geological Survey (GS). Mean daily flow rates from these stations were utilized in this study whenever possible. The instantaneous flows determined by EPA were obtained by standard stream gaging methods utilizing a Marsh-McBirney electromagnetic current meter with direct velocity readout. Water samples were collected at each site for immediate analysis (within 4 hours) in the temporary field office for the following parameters: turbidity, total alkalinity, hardness, and dissolved oxygen. The dissolved oxygen samples were collected in 300 ml glass BOD bottles - all other samples were collected in 0.95 ~ (1 qt.) polyethylene cubi- tainers. When required, samples were kept chilled in ice chests until analyzed. A Hach Turbidimeter with formazin liquid standards was used for the turbidity measurements. Total alkalinity was determined potentio- metrically while hardness was determined by the EDTA Titrimetric method. Dissolved oxygen measurements were obtained by the Winkler titration method employing field fixing with the appropriate powder reagents. Additional water was collected from each site for analysis for chloride, fluoride, boron, total dissolved solids (TDS), total suspended solids (TSS), and metals. The TSS samples were collected by a dip-and- take method after comparison with the recommended depth-integration method showed that in the rapidly flowing streams sampled in this study there . . . . 8 . J