WATER QUALITY STUDIES OF THE SPOKANE RIVER BETWEEN COEUR D'ALENE, IDAHO AND POST FALLS, IDAHO 1988 EPA 910/9-91-006 ------- TABLE OF CONTENTS Page Number List of Figures ii List of Tables v INTRODUCTION 1 FIELD STUDIES 4 RESULTS 7 CONCLUSIONS 34 BIBLIOGRAPHY 35 APPENDIX A-Measurements of Water Quality A-l APPENDIX B - Method for Estimating Cross-Sectional Averages B-1 APPENDIX C - Citizens'Volunteer Monitoring Program C-l ------- LIST OF FIGURES Figure Number Page Number 1 Location map for the field study of the Spokane River, August 16-18, 1988, showing water quality sampling stations 2 2 Mean, maximum and minimum temperature in the Spokane River between Lake Coeur d' Alene and Post Falls Dam during the field study of August 16-18,1988 9 3 Vertical profiles of temperature at Stations 5 and 6 on August 18,1988 10 4 Mean, maximum and minimum dissolved oxygen in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18, 1988 12 5 Vertical profiles of dissolved oxygen at Stations 5 and 6 on August 18,1988 13 6 Mean, maximum and minimum conductivity in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18,1988 15 7 Mean, maximum and minimum pH in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18, 1988 16 8 Mean, maximum and minimum total phosphorus in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18,1988 17 9 Mean, maximum and minimum NO2+NO3 in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18,1988 18 ------- LIST OF FIGURES (cont) Figure Number Page Number 10 Mean, maximum and minimum Kjeldahl Nitrogen in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18, 1988 19 11 Mean, maximum and minimum Ammonia Nitrogen in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18, 1988 20 12 Mean, maximum and minimum ultimate BOD in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18, 1988 22 13 Mean, maximum and minimum alkalinity in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18,1988 24 14 Mean, maximum and minimum hardness in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18, 1988 25 15 Mean, maximum and minimum total arsenic in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18,1988 26 16 Mean, maximum and minimum total recoverable cadmium in the Spokane River between Lake Coeur d'Alene and Post Falls during the field study of August 16-18, 1988 27 17 Mean, maximum and minimum total recoverable copper in the Spokane River between Lake Coeur d'Alene and Post Falls during the field study of August 16-18, 1988 28 in ------- iLIST OF FIGURES (cont) Figure Number Page Number 18 Mean, maximum and minimum total recoverable chromium in the Spokane River between Lake Coeur d'Alene and Post Falls during the field study of August 16-18, 1988 29 19 Mean, maximum and minimum total recoverable iron in the Spokane River between Lake Coeur d'Alene and Post Falls during the field study of August 16-18,1988 30 20 Mean, maximum and minimum total recoverable lead in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18, 1988 31 21 Mean, maximum and minimum total recoverable mercury in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18, 1988 32 22 Mean, maximum and minimum total recoverable zinc in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18, 1988 33 IV ------- LIST OF TABLES Table Number Page Number 1 Sampling activities for the Spokane River field study, August 16-18, 1988 5 2 Daily discharge in the Spokane River near Post Falls and gage height in Lake Coeur d'Alene during August 1988 8 3 Mean, maximum and minimum of the estimated deoxygenation rate, KI, in the Spokane River during the field study of August 16-18, 1988 21 4 Mean, maximum and minimum values of water quality characteristics in the effluent of the City of Coeur d'Alene's STP during the field study of August 16-18, 1988 34 A-1 In-situ measurements of water quality in the Spokane River during the field study of August 16-18, 1988 A-2 A-2 Laboratory measurements of water quality for receiving waters and point sources during August 16-18,1988 A-14 A-3 Index for location of laboratory samples for receiving waters and point sources during the field study of August 16-18,1988 A-18 C-1 Water quality measurements in the Spokane River at the Cedars Site C-l C-2 Water quality measurements in the Spokane River at Harbor Island C-2 C-3 Water quality measurements in the Spokane River at Post Falls Bridge C-3 ------- INTRODUCTION During the period August 15-18, 1988 EPA Region 10 conducted a field study of water quality in the Spokane River between the outlet of Lake Coeur d'Alene and Post Falls Dam (Figure 1). The primary purpose of this field study was to assess water quality in the Spokane River during a period of low river flow and elevated water temperature. In addition, there is a need for data to support the mathematical model of dissolved oxygen (DO) in the reach of the Spokane River between its outlet from Lake Coeur d'Alene and the Post Falls Dam. A model of the dissolved oxygen budget of this reach of the river has been used to develop permit limitations for the City of Coeur d'Alene under EPA's National Pollution Discharge Elimination System Permit (NPDES) program. It will also be used to evaluate the impact of additional discharges to this segment, including the proposed discharge by the City of Hayden Lake. The reach of the river between the outlet of Lake Coeur d'Alene and Post Falls Dam presently receives the discharge from the waste treatment plant of the City of Coeur d'Alene. Coeur d'Alene has submitted plans to increase the discharge from this treatment plant. The City of Hayden Lake is also considering locating the outfall from their treatment plant in this reach of the river. Results from previous studies of water quality by the EPA (Yearsley, 1980) and the USGS (Seitz and Jones, 1982) have shown that under certain hydrologic conditions dissolved oxygen in the river decreases downstream from the treatment plant discharge. Furthermore, the results of mathematical modelling (Yearsley, 1987) indicate that the proposed increases in discharge of oxygen demanding material could lead to conditions for which the water quality standards of the State of Idaho would be exceeded. Other water quality issues which have been identified in the Spokane River basin are heavy metals toxicity and excess nutrient loadings. The heavy metals toxicity is associated with mining activities on the Coeur d'Alene River, which discharges into Lake Coeur d'Alene. Excess nutrients in the Spokane River have been identified as the cause of accelerated rates of eutrophication in Long Lake, in ------- Temperature, Dissolved Oxygen, pH, Conductivity, BOD, Nutrients, Metals, Water Clarity Temperature, Dissolved Oxygen, pH, Conductivity, Water Clarity Station Number Spokane River Mile Figure 1. Location map for the field study of the Spokane River, August 16-18, 1988 showing water quality sampling stations ------- the State of Washington. The Spokane River, which receives effluent from a number of municipal and industrial sources, discharges to Long Lake several miles downstream from Post Falls. ------- FIELD STUDIES In support of the objectives of assessing water quality , the field study program included measurements of water quality constituents and parameters in both the receiving waters and in effluent of municipalities presently discharging or considering discharge to the segment of the Spokane River between Lake Coeur d'Alene and Post Falls Dam. Table 1 shows the survey dates and the type of information collected. Data collected during the survey, including in situ and laboratory measurements, are given in Appendix A. Receiving Waters Data collected in the receiving waters included both observations made in the field and measurements from samples shipped to the EPA Regional Laboratory at Manchester, Washington. Temperature, DO, conductivity and pH measurements made in the field with a Hydrolab Model 4000 Calibration procedures for the Hydrolab Model 4000 were done in conformance with the manufacturers recommendations. The receiving water monitoring program was designed so that data could be used to characterize the distribution of water quality in both space and time. In situ measurements of temperature, DO, conductivity and pH were made at several depths; in the right, middle and left one-thirds of the river at each of the locations shown in Figure 1. This spatial sampling schedule was followed once in the morning and once in the afternoon each day during the period of August 16-18, 1988. Samples for the laboratory analysis of biological oxygen demand (BOD), nutrients, and heavy metals were obtained at each of the locations shown Figure 1 by make a composite from samples taken at several depths and at the right, middle and left sections of the station. The samples of this type were collected during the morning only. The samples were stored in polyethylene containers, packed in ice and shipped daily, via air freight, to the Regional Laboratory at Manchester, Washington. Methods used for measurements made in the laboratory follow procedures described in EPA (1983). ------- Table 1. Sampling activities for Spokane River field study, August 16-18, 1989 Medium Parameters Spatial Distribution Sampling Frequency Receiving water Point source Temperature, DO, pH, conductivity, Secchi disk BOD (5-, 10, 15- and 20-day) Total Metals As Total Recoverable Metals Cd,Cr,Cu,Fe,Pb, Hg,Zn Nutrients Total P Ammonia N NO2+NO3-N Kjeldahl N Temperature, DO, pH, conductivity BOD (5-, 10, 15- and 20-day) Total Metals As Total Recoverable Metals Cd,Cr,Cu,Fe,Pb, Hg.Zn Nutrients Total P Ammonia N NO2+NO3-N KjeldahlN Vertical profiles at 1/4, 1/2 and 3/4 of the river width Composite from surface, mid-depth and bottom at 1/4, 1/2 and 3/4 of river width Twenty-four hour composite Twenty-four hour composite Twice daily August 16-18, 1989 Once daily August 16-18, 1989 Once daily August 15-18, 1989 Once daily August 16-18, 1989 Suspended Solids ------- Locations of receiving water sampling stations for which laboratory analyses were performed are shown in Figure 1. Point Sources Samples from the municipal treatment facilities in Hayden Lake and Coeur d'Alene were obtained from 24-hour composites of the each treatment plants effluent. For those samples analyzed at the Regional Laboratory, handling and measurement procedures were the same as for the receiving water samples as described above. Flow measurements were obtained from measurement devices maintained at each facility. ------- RESULTS Receiving Waters For purposes of analyzing the results, the receiving water data (Appendix A) were aggregated in terms of time and depth-averages. The averaging method used to aggregate the data is described in Appendix B. River Flow and River Surface Elevation River flow was not measured as part of the EPA Region 10 study. However, the U.S. Geological Survey maintains a stream gage just below Post Falls Dam. Provisional records from this station and observations of river surface elevation were made available by Mr. Stuart Gutenberg of the USGS in Sand Point, Idaho. Data for the month of August are presented in Table 2. Water Temperature Average, maximum and minimum water temperatures measured during the field studies are shown in Figure 2. Averages are by station, across days. Maxima and minima are the highest and lowest temperature, respectively, measured at each station during three-day study. The distribution of water temperature during this field study was similar to that found during the field study of August 16-17,1979 (Yearsley, 1980). Average temperatures ranged from 21.4 °C to 22.9 °C. For those segments of the river with water depths less than approximately seven meters, temperatures were nearly uniform from top to bottom and from left bank to right bank. In those segments for which water depth was greater than seven meters (Station 6 , 8 and Post Falls Dam), there was a thermocline from a depth of seven meters to the bottom. Vertical profiles of temperatures at a station with depth less than seven meters (Station 5) and greater than seven meters (Station 6) are shown in Figure 3. ------- Table 2. Daily discharge in the Spokane River near Post Falls and gage height in Lake Coeur d'Alene during August 1989 (preliminary information from the USGS). Day 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Discharge (cfs) 684 729 545 431 463 494 476 470 393 344 338 334 348 346 337 338 357 350 346 344 346 344 340 338 340 336 327 318 319 329 359 Gage Height (feet) 2127.82 2127.80 2127.82 2127.83 2127.82 2127.83 2127.80 2127.81 2127.81 2127.81 2127.80 2127.81 • 2127.82 2127.82 2127.82 2127.79 2127.80 2127.81 2127.79 2127.79 2127.78 2127.78 2127.78 2127.79 2127.78 2127.75 2127.75 2127.76 2127.77 2127.75 2127.72 ------- CJ ab 2 0) I 23 22- 21- 20 19- 18 100 102 104 106 108 B O 110 112 D Mean A Maximum 0 Minimum Spokane River Mile Figure 2. Mean, maximum and minimum temperature in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18, 1988. ------- 1 5- 10- 15 20 18 Q A Q A El A Q Approximate Depth of Thermocline 19 20 21 22 13 Station 5 A Station 6 <=> 23 Temperature - deg. C Figure 3. Vertical profiles of temperature at Stations 5 and 6 on August 18,1988. ------- 11 The lowest temperature observed at depth during the study was 18.6 °C at Post Falls Dam Data collected in the State of Idaho's Volunteer Monitoring Program (Appendix C) show that temperature of the water surface was 19 °C between May 25, 1988 and June 25, 1988. This implies that the water at depth with temperatures of less than 19 °C had been there for at least five to six weeks. Dissolved Oxygen Daily cross-sectional averages of concentrations and saturation levels for dissolved oxygen, measured at each station during the field study, are shown Figure 4. Stations 1-5 show a consistent increase in the average concentration from morning to afternoon. These stations are all fairly shallow and well-mixed from top to bottom. Water transparency, as measured by Secchi disk, were generally in the range of 3.0 to 4.0 meters at these stations. . Assuming that the depth of active photosynthesis is given by 1.7*Secchi depth, Stations 1-5 are shallow enough that the cross-sectional average is affected by photosynthetic activity. Stations 6, 8 and Post Falls Dam show a consistent increase from morning to afternoon for cross-sectional averages only for the top five meters. The total cross-sectional average at these three stations is controlled by the extremely low values of DO occurring at depth. Photosynthesis has a much smaller role in the DO at depth. As a result, the deeper stations have less diurnal variability in depth-averaged value of DO than do the shallow stations. When the flow in the Spokane River is low, vertical mixing is reduced and, as described above, a thermocline develops at those locations for which water depth is greater than approximately seven meters. The vertical distribution of DO is also affected by the reduced mixing and at DO also decreases rapidly at depths greater than approximately seven meters. Vertical profiles of DO at a shallow station (Station 5) and a deep station (Station 6) are compared in Figure 5. ------- 8 c 5 •3 VI 5 10 8- 6- 100 A B A D A Q A A El 102 104 106 108 Spokane River Mile 110 B Mean A Maximum 0 Minimum 112 Figure 4. Mean, maximum and minimum dissolved oxygen in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18,1988. ------- 5- 10- 15- 20 Approximate Depth of Thermocline 4 6 DO-mg/1 A 0 A m A E Q D Station 5 A Station 6 10 Figure 5. Vertical profiles of dissolved oxygen (DO) at Stations 5 and 6 on August 18,1988. ------- 14 Conductivity and pH Conductivity and pH were measured both in the field with the Hydrolab Survey Model 4000 and in the laboratory. Cross-sectional averages of the conductivity measured in the field for the three-day sampling period are given in Figure 6. Average pH increases monotonically downstream from the outlet of Lake Coeur d'Alene, as shown in Figure 7. Nutrients Concentrations of total phosphorus, nitrate+nitrite-nitrogen, Kjeldahl nitrogen and total ammonia-nitrogen, averaged over the three-day period of the field study, are shown in Figures 8 through 11. Average total phosphorus were below the detection level (0.01 mg/1) at the outlet of Lake Coeur d'Alene. Average total phosphorus increased to 0.055 mg/1 at the first river sampling station downstream from the STP. As shown in Figure 8, the average concentration of total phosphorus decreased in a downstream direction after the initial pulse was introduced by the STP. Possible sinks for total phosphorus include uptake by attached algae and macrophytes and uptake by planktonic algae which eventually settle to the bottom of the river. No data were collected during this survey for testing either of these hypotheses. Nitrate+nitrite-nitrogen in the Spokane River was below the level of detection (0.01 mg/I) throughout the field study (Fig. 9). Both Kjeldahl nitrogen and total ammonia-nitrogen were greater at the station just downstream from the discharge of the STP, as shown in Figures 10 and 11. However, Kjeldahl nitrogen and ammonia-nitrogen decreased downstream after the initial increase. Volatilization, nitrification, and algal uptake are potential sinks for ammonia. When nitrification occurs, the loss in ammonia-nitrogen should be accompanied by an increase in nitrate-nitrogen. The measurements of nitrate+nitrite-nitrogen made in this study do not show an increase in nitrate+nitrite-nitrogen corresponding to the decrease in ammonia- nitrogen. Insufficient information was available to determine the importance of volatilization or algal uptake to the nitrogen budget. ------- I >* o 60 58- 56- 54- 52- 50 102 A Q A Q O A ID O A Q Q Mean A Maximum ° Minimum 104 106 108 Spokane River Mile 110 112 Figure 6. Mean, maximum and minimum conductivity in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field of study of August 16-18, 1988. ------- .§ 3 1 GO i 7.5 7.0- 6.5- 6.0- 5.5 A D O A 0 O A 0 0 Q O Q Mean A Maximum ° Minimum 102 104 106 108 Spokane River Mile 110 112 Figure 7. Mean, maximum and minimum pH in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18, 1988. ------- •§> E I 0.10 0.08-1 0.06-1 0.04-J 0.02-J 0.00 102 D O Q Mean A Maximum ° Minimum 104 106 108 Spokane River Mile 110 112 Figure 8. Mean, maximum and minimum total phosphorus in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18, 1988. ------- 0.011 I 0.010-^ 0.009 13 Mean A Maximum 0 Minimum 00 102 104 106 108 110 112 Spokane River Mile Figure 9. Mean, maximum and minimum NO2+NO3-Nitrogen in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18,1988. ------- •§, 6 2 13 0.4 0.3 -] o.i- 0.0 102 Q Mean A Maximum ° Minimum 104 106 108 110 112 Spokane River Mile Figure 10. Mean, maximum and minimum Kjeldahl Nitrogen in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18,1988. ------- I 0.15 0.10- 0.05- 0.00 102 a o Q Mean A Maximum 0 Minimum 104 106 108 110 112 Spokane River Mile Figure 11. Mean, maximum and minimum NH3 Nitrogen in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18,1988. ------- 21 Biological Oxygen Demand (BODI Ultimate BOD, Luit, and rates of deoxygenation,Ki, were determined from standard, uninhibited 5-, 10-,15-,20- and 60-day BOD measurements from samples obtained on each of the three days during the field study. The parameters Luit and Kl were estimated by minimizing the squared difference between the observations and the equation for BOD: -K.t L = LuUe 1 (1) where, L = the BOD at any time, t, mg/1 Luit = the ultimate BOD, mg/1 t = time, days KI = the deoxygenation rate constant, days"1. The simplex method for minimizing a nonlinear function (Nelder and Mead, 1964) was used to find the minimum. The mean, maximum and minimum ultimate BOD for the receiving water stations are shown in Figure 12, the estimated values of the deoxygenation rates, KI, are shown in Table 3. Table 3. Mean, maximum and minimum of the estimated deoxygenation rate, KI, in the Spokane River during the field study of August 16-18,1988. Deoxygenation Rate, KI, days'1 Spokane River Mile 111.1 108.6 106.5 104.4 102.2 Mean 0.05 0.05 0.08 0.09 0.08 Maximum 0.06 0.05 0.13 0.14 0.10 Minimum 0.04 0.05 0.06 0.06 0.06 ------- I I § « 9 a •a 4- 3- 2- Q O 13 Mean * Maximum 0 Minimum to to 102 104 106 108 110 112 Spokane River Mile Figure 12. Mean, maximum and minimum ultimate BOD in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18, 1988. ------- 23 Alkalinity and Hardness Mean, maximum and minimum of observed alkalinity and hardness in the Spokane River during the field study are shown in Figures 13 and 14, respectively. Both hardness and alkalinity increase downstream implying a continuous inflow along the entire reach. Groundwater inflow (Drost and Seitz, 1978) represents a potential source. Metals Average concentrations of total arsenic, total recoverable cadmium, total recoverable copper, total recoverable chromium,total recoverable iron, total recoverable lead, total mercury, and total recoverable zinc are shown in Figures 15 through 22. Point Sources Water samples from the Coeur d'Alene STP, composited over a 24-hour period, were collected on August 16, 17, 18, and 19, 1989. The average, maximum and minimum for measurements of flow rates, nutrients, metals, BOD and conductivity are given in Table 4. Average flow of the STP on each of these days was obtained from the flow-measuring device operated by the STP. Loadings were estimated as the product of the average flow times the measured concentration of the composited sample. The loadings estimated in this way are also given in Table 4. ------- t 8 y o (A at 22. 21- 20- 19- 18 102 B O A B Q Mean A Maximum ° Minimum to 104 106 108 110 112 Spokane River Mile Figure 13. Mean, maximum and minimum alkalinity in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18,1988. ------- •a e cA 22- O U 6 CO c3 CO CO 0> 1 K "3 21. o H 90- A A D A D Q A 0 A m 0 0 Q 0 D Mean A Maximum ° Minimum to Ul 102 104 106 108 Spokane River Mile no 112 Figure 14. Mean, maximum and minimum hardness in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18,1988. ------- I 1.0- 0.8- 0.6- 0.4. 0.2. 0.0. 100 D O A D Q Mean A Maximum ° Minimum to o\ 102 104 106 Spokane River Mile 108 110 112 Figure 15. Mean, maximum and minimum total arsenic in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18,1988. ------- s. I 1.5 1.0- 0.5- 0.0 100 Q O n o Q Mean A Maximum ° Minimum to 102 104 106 108 110 112 Spokane River Mile Figure 16. Mean, maximum and minimum total recoverable cadmium in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18,1988. ------- I 3 u u 1 b § 10 8- 6- 4- 2- 102 Q Mean A Maximum 0 Minimum 104 106 108 110 112 to oo Spokane River Mile Figure 17. Mean, maximum and minimum total recoverable copper in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18, 1988. ------- d3 u 4- 3-1 2- 1- 100 Q O 102 A 8 104 106 108 Spokane River Mile 110 Q Mean A Maximum ° Minimum 112 Figure 18. Mean, maximum and minimum total recoverable chromium in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18,1988. ------- o 100. 80- 60- 40- 20- 100 D O 102 A 3 A Q O Q Mean A Maximum 0 Minimum 104 106 108 Spokane River Mile 110 112 Figure 19. Mean, maximum and minimum total recoverable iron in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18,1988. ------- fi 4- 3- 2- 1- 100 D O 102 A Q Q O 104 106 108 Spokane River Mile Q O 110 112 Q Mean A Maximum ° Minimum Figure 20. Mean, maximum and minimum total recoverable lead in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18, 1988. ------- f bo ffi u 1 0.5 0.4-1 0.3- 0.1- 0.0 100 A D o 102 13 Mean A Maximum ° Minimum 104 106 108 Spokane River Mile 110 112 U) to Figure 21. Mean, maximum and minimum total recoverable mercury in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18,1988. ------- •§> 3 ' U s G ^ (U Di a o £ 90- 80- 70- 60- 50- 40- 30- 20- 10- 0- A Q 0 ° A D A 0 ° 6 o Q Mean A Maximum ° Minimum 100 102 104 106 108 Spokane River Mile 110 112 Figure 22. Mean, maximum and minimum total recoverable zinc in the Spokane River between Lake Coeur d'Alene and Post Falls Dam during the field study of August 16-18,1988. ------- 34 Table 4. Mean, maximum and minimum values of water quality characteristics of the effluent of City of Coeur d'Alene's STP during the field study of August 16-18, 1988. Loadings for BOD, nutrients and metals are also shown. Parameter Flow - cfs Deoxygenation Rate, KI - days'1 pH - standard units Conductivity - }imho/cm Alkalinity as CaCOs -mg/1 Hardness as CaCOs -mg/1 NHs-Nitrogen - mg/1 NO2+NOs-Nitrogen -mg/1 Kjeldahl Nitrogen - mg/1 Total Phosphorus - mg/1 Total As - Hg/1 Total Recoverable Cd-ng/1 Total Recoverable Cu - ng/1 Total Recoverable Cr Total Recoverable Total Recoverable Hg-ng/1 Total Recoverable Mean 4.24 0.07 6.7 674 197 71 15.8 1.2 22.3 7.0 1.5 0.70 5.9 3.5 5.3 0.11 31 Parameter Value Maximum 4.45 0.08 6.7 677 202 110 16.6 1.6 23.0 7.2 1.8 1.0 14.4 ' 4.0 7.0 0.17 51 Minimum 4.09 0.06 6.7 672 193 32 14.7 0.8 21.5 6.8 1.4 0.5 1.6 3.1 4.0 0.08 0 Loading Pounds/Day — — — — — 360 28.1 510 160 0.04 0.02 0.10 0.08 0.10 0.003 0.71 Zn-ng/1 ------- 35 CONCLUSIONS The results of the field study conducted during the period August 16-18, 1988 were were similar to those of earlier studies (Yearsley, 1980) in a number of ways. Major conclusions derived from the results include: • Dissolved oxygen was low at those locations in the river where a thermocline had formed. The depth of the thermocline was generally at a depth of approximately seven meters and was observed in two segments of the river. One of these segments was near Ford Rock (Spokane River Mile 104.4) and the other was in the forebay of Post Falls Dam (Spokane River Mile 102.2). • The City of Coeur d'Alene's STP contributes a significant load of phosphorus to the Spokane River. Upstream from the STP discharge the observed concentration of total phosphorus was below the detection limit of 0.01 mg/1. The mean value of observed total phosphorus downstream from the STP was 0.055 mg/1. The estimated average loading of total phosphorus from the STP was 160 pounds/day during this period. In addition, the results of the August 16-18, 1988 field study showed that the City of Coeur d'Alene' STP contributed significantly to the BOD loading and to the loading of nitrogen, primarily in the form or organic nitrogen and ammonia. ------- 36 BIBLIOGRAPHY Drost, B.W. and H.R. Seitz. 1978. Spokane Valley-Rathdrum Prairie Aquifer, Washington and Idaho, U.S. Geological Survey Open-File Report 77-289. Seitz, H.R. and M.L. Jones. 1982. Flow characteristics and water-quality conditions in the Spokane River, Coeur d'Alene Lake to Post Falls Dam, northern Idaho. USGS Open- File Report 82-102. 56pp. Yearsley, J.R. 1980. Water quality studies of the Spokane River between Coeur d'Alene, Idaho and Post Falls, Idaho, 1978-1979. EPA Region 10, Seattle, WA. 53 pp. Yearsley, J.R. 1987. An estimate of NPDES permit limits for the Cities of Post Falls and Coeur d'Alene, Idaho. ESD, EPA Region 10, Seattle, WA. ------- APPENDIX A Measurements of Water Quality in the Receiving Waters and from Point Sources in the Spokane River between Coeur d'Alene and Post Falls, Idaho In situ measurements of water quality in the Spokane River between Coeur d'Alene and Post Falls, Idaho during the period August 16-18,1988 are given in Table A-l. Station locations can be obtained from Figure 1. Laboratory measurements of various water quality characteristics from both receiving waters and point sources are given in Table A-2. The key relating laboratory sample numbers and station location is given in Table A-3. ------- Table A-l. In-situ measurements of water quality in the Spokane River during the field study of August 16-18, 1988. Date 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 Time hm 630 650 700 713 718 723 734 746 754 805 813 820 833 842 851 905 906 910 918 929 935 Station Location #1 Right #lMid #lLeft #2 Right #2 Mid #2 Left #3 Right #3 Mid #3 Left #3A Right #3 A Mid #3 A Left #4 Right #4 Mid #4 Left #4 A Right MA Mid #4ALeft #5 Right #5 Mid #5 Left Depth m 0.9 2.8 0.3 2.0 0.8 2.4 0.7 3.2 0.7 2.8 0.7 2.1 0.3 2.6 0.9 3.3 0.8 2.4 0.8 2.8 0.9 3.1 0.9 3.1 0.6 5.5 0.5 5.1 0.8 3.5 0.7 2.6 0.7 5.6 0.9 6.5 0.7 5.9 0.8 5.9 0.9 5.0 Temp C 20.34 20.37 20.14 20.17 20.20 20.22 20.31 20.35 20.39 20.31 20.24 19.99 20.80 20.86 20.94 20.97 20.91 20.90 21.26 21.30 21.27 21.24 21.31 21.16 21.42 21.45 21.48 21.33 21.50 21.52 21.72 21.75 21.82 21.81 21.82 21.78 21.93 21.88 21.92 21.82 21.95 21.90 DO mg/L 7.45 8.07 8.16 8.09 8.08 7.93 7.95 7.88 7.92 7.91 7.97 7.88 7.78 7.60 7.84 7.77 8.06 7.96 7.23 7.18 7.68 7.87 7.86 7.87 8.10 8.05 8.08 7.79 7.97 7.97 8.61 8.57 8.52 8.46 8.51 8.32 8.71 8.40 8.72 8.65 8.73 8.73 DO %Sat 88.3 95.7 96.3 95.6 95.5 93.8 94.2 93.4 94.0 93.7 94.3 92.8 93.0 91.0 94.0 93.2 96.6 95.4 87.2 86.7 92.7 94.9 94.9 94.7 98.0 97.5 97.9 94.0 96.6 96.6 104.8 104.4 103.8 103.1 103.7 101.4 106.4 102.5 106.5 105.4 106.7 106.6 Cond umho/cm 48 48 48 48 49 49 53 52 51 49 49 50 52 53 53 53 53 53 53 53 54 53 52 53 53 53 52 52 53 53 53 52 54 52 52 52 52 52 52 52 52 52 PH std units 7.54 7.79 7.45 7.66 7.37 7.59 7.45 7.53 7.55 7.41 7.52 7.29 7.51 7.20 7.21 7.24 7.32 7.04 6.75 7.11 7.29 7.28 7.16 7.25 7.18 7.38 7.04 7.40 7.01 7.36 7.07 7.50 7.48 7.52 7.38 7.47 7.32 7.57 7.52 7.77 7.46 7.84 Secchi Depth meters 3.0 4.0 * 3.8 3.5 4.0 3.8 3.5 3.3 3.6 A-2 ------- Table A-l. In-situ measurements of water quality in the Spokane River during the field study of August 16-18, 1988. Date 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 Time hm 954 1001 1008 1020 1030 1035 1044 1430 1437 1441 1445 1452 1454 1500 Staloc #6 Right #6 Mid #6 Left #8 Right #8 Mid #8 Left P.F. Dam LakeEnt #1 Right tflMid #lLeft #2 Right #2 Mid #2 Left Depth m 0.8 2.0 5.0 7.0 7.7 0.8 2.0 5.0 7.0 0.2 2.0 3.0 0.9 2.0 5.0 7.0 8.9 0.9 2.0 0.9 0.8 2.0 5.0 7.0 10.0 12.5 1.1 2.0 5.0 1.0 2.0 1.0 2.2 1.0 3.3 1.0 3.0 1.0 3.2 1.0 2.0 Temp C 22.04 22.03 21.91 21.91 21.81 22.05 22.03 21.98 21.83 22.05 22.04 21.99 22.05 21.98 21.90 21.82 21.48 22.02 22.05 22.08 22.06 22.01 21.89 21.73 21.12 19.04 21.74 21.58 21.23 21.34 21.34 21.42 21.11 21.42 21.03 21.33 21.01 21.16 21.01 21.08 21.01 DO mg/L 8.26 8.29 8.15 7.64 7.09 8.41 8.39 8.33 7.53 8.46 8.39 8.42 8.31 8.26 8.18 7.88 4.46 8.35 8.35 8.46 8.18 8.07 7.82 6.65 3.13 0.18 7.56 7.55 7.62 8.29 8.23 8.16 8.25 8.34 8.42 8.09 8.28 8.27 8.16 8.47 8.40 DO %Sat 101.1 101.4 99.5 93.3 86.4 102.9 102.6 101.9 91.8 103.6 102.7 102.9 101.8 101.0 99.9 96.0 54.0 102.2 102.2 103.6 100.2 98.8 95.5 80.9 37.6 2.0 92.1 91.7 91.9 100.1 99.4 98.7 99.2 100.9 101.2 97.7 99.4 99.5 97.9 101.8 100.8 Cond umho/cm 52 51 52 52 51 52 52 52 52 52 52 52 51 51 51 51 51 52 52 51 52 51 52 51 51 51 49 50 49 49 49 49 50 50 50 59 55 51 55 51 51 PH std units 7.43 7.53 7.50 7.34 7.13 7.48 7.33 7.64 7.26 7.37 7.52 7.58 7.30 7.40 7.53 7.42 6.85 7.39 7.44 7.46 7.44 7.41 7.26 6.91 6.63 6.46 7.21 7.28 7.36 7.56 7.66 7.48 7.64 7.51 7.68 7.22 7.37 7.44 7.38 7.64 7.67 Secchi Depth meters 4.5 4.2 '• 4.5 A-3 ------- Table A-l. In-situ measurements of water quality in the Spokane River during the field study of August 16-18,1988. Date 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 Tune hm 1506 1510 1515 1520 1525 1528 1536 1541 1545 1550 1557 1603 1606 1609 1615 1620 1630 Staloc #3 Right #3 Mid #3 Left #3A Right #3 A Mid #3 A Left #4 Right #4 Mid #4 Left #4 A Right MAMid #5 Right #5 Mid #5 Left #6 Right #6 Mid #6 Left Depth m 1.0 2.6 1.0 3.5 1.0 2.2 1.0 3.0 1.0 3.2 1.0 2.5 1.0 5.5 1.0 5.4 1.0 1.0 1.7 1.0 6.7 1.0 5.8 1.0 6.5 1.0 3.1 1.0 2.0 5.0 8.0 1.0 2.0 5.0 7.0 10.0 11.0 1.0 Temp C 21.45 21.32 21.37 21.31 21.45 21.38 21.79 21.47 21.79 21.47 21.78 21.49 22.14 21.44 22.19 21.40 22.25 22.53 22.21 22.43 21.80 22.86 21.95 22.78 21.91 22.66 22.10 22.57 22.41 22.02 22.41 22.50 22.36 22.05 21.86 21.09 20.71 22.47 DO mg/L 8.33 8.18 8.34 8.23 8.59 8.28 8.00 7.97 8.33 8.64 8.53 8.80 8.46 7.82 8.60 8.15 8.73 8.62 8.64 9.13 7.63 8.82 8.50 8.73 8.39 8.87 8.81 8.71 8.56 8.44 8.56 8.71 8.63 8.46 6.66 4.43 3.80 8.69 DO %Sat 100.9 98.8 100.8 99.4 104.0 100.1 97.4 96.5 101.5 104.6 103.9 106.5 103.8 94.7 105.6 98.5 107.3 106.5 106.1 112.5 93.0 109.6 103.8 108.3 102.4 109.8 108.0 107.7 105.5 103.3 105.5 107.5 106.2 103.6 81.2 53.3 45.3 107.3 Cond umho/cm 54 53 53 54 53 53 53 53 53 53 53 53 53 53 54 52 52 53 53 54 53 53 52 53 52 53 52 52 52 51 52 53 52 52 52 52 53 52 pH std units 7.21 7.28 7.28 7.34 7.44 7.36 7.11 7.18 7.27 7.41 7.34 7.34 7.27 7.15 7.36 7.24 7.47 7.94 7.95 7.68 7.37 7.57 7.46 7.68 7.51 7.70 7.72 7.61 7.55 7.39 7.55 7.59 7.59 7.61 6.95 6.69 6.62 7.54 Secchi Depth meters A-4 ------- Table A-l. In-situ measurements of water quality in the Spokane River during the field study of August 16-18,. 1988. Date 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/16/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 Time hm 1645 1650 1656 1700 630 640 646 656 700 704 711 720 730 742 747 750 Staloc #8 Right #8 Mid #8 Left P.P. Dam #1 Right #lMid tflLeft #2 Right #2 Mid #2 Left #3 Right #3 Mid #3 Left #3A Right #3AMid #3 A Left Depth m 2.0 5.0 8.9 1.0 2.0 5.0 7.2 10.0 1.0 2.0 1.0 1.0 2.0 5.0 7.0 10.0 11.9 1.0 2.8 1.0 2.0 1.0 2.9 1.0 2.8 1.0 2.9 1.0 2.2 1.0 3.0 1.0 3.7 1.0 2.6 1.0 3.3 1.0 3.2 1.0 3.0 Temp C 22.33 22.01 21.46 22.67 22.61 22.07 21.88 21.45 22.58 22.46 22.47 22.68 22.63 22.03 21.89 21.06 19.49 20.59 20.53 20.60 20.65 20.63 20.63 20.85 20.86 20.93 20.66 20.90 20.75 20.49 20.47 20.54 20.56 20.51 20.48 20.89 20.80 20.94 20.80 20.93 20.75 DO mg/L 8.59 8.22 4.64 8.52 8.25 8.30 7.29 2.35 8.46 8.36 8.67 8.20 8.32 8.19 6.88 2.13 0.01 7.93 7.88 7.81 7.67 7.53 7.56 7.88 7.73 7.80 7.89 7.70 7.83 7.60 7.46 7.88 7.75 8.14 7.89 7.67 7.72 7.50 7.69 7.53 7.77 DO %Sat 105.7 100.6 56.2 105.5 102.0 101.6 88.9 28.5 104.6 103.1 106.9 101.6 103.0 100.3 84.0 25.6 0.1 94.5 93.7 93.1 91.4 89.7 90.2 94.3 92.5 93.4 94.1 92.3 93.6 90.4 88.7 93.7 92.2 96.8 93.7 91.8 92.3 89.9 92.0 90.2 92.8 Cond umho/cm 52 52 53 51 51 51 50 52 52 52 52 53 51 51 52 52 52 49 48 49 48 48 48 58 58 54 54 50 50 52 52 52 52 51 51 53 53 53 53 53 53 PH std units 7.63 7.31 6.78 7.47 7.42 7.40 7.17 6.54 7.44 7.41 7.71 7.44 7.50 7.44 7.09 6.56 6.37 7.47 7.44 7.41 7.36 7.30 7.31 7.30 7.26 7.26 7.44 7.38 7.46 7.26 7.23 7.34 7.29 7.47 7.41 7.20 7.20 7.15 7.22 7.15 7.23 Secchi Depth meters '• 3.4 4.1 A-5 ------- Table A-l. In-situ measurements of water quality in the Spokane River during the field study of August 16-18, 1988. Date 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 Time hm 755 806 814 823 827 831 840 847 857 905 915 930 Station Location #4 Right #4 Mid #4 Left #4A Right #4AMid #4ALeft #5 Right #5 Mid #5 Left #6 Right #6 Mid #6 Left Depth m 1.0 2.0 5.0 1.0 2.0 5.0 1.0 2.0 1.0 1.5 1.0 1.5 1.0 2.0 5.0 6.5 1.0 2.0 5.9 1.0 2.0 5.0 6.1 1.0 2.0 5.0 6.0 1.0 2.0 5.0 7.0 7.8 1.0 2.0 5.0 7.0 10.0 12.8 1.0 2.0 5.0 7.5 10.0 Temp C 21.29 21.35 21.32 21.36 21.37 21.32 21.32 21.36 21.42 21.40 21.60 21.40 21.63 21.63 21.63 21.62 21.73 21.78 21.70 21.75 21.78 21.75 21.72 21.76 21.78 21.72 21.65 21.81 21.83 21.84 21.83 21.58 21.89 21.89 21.83 21.79 21.02 19.87 21.90 21.90 21.86 21.83 21.11 DO mg/L 8.01 7.92 7.92 8.05 7.96 7.97 8.24 8.22 8.71 8.63 8.56 8.63 8.52 8.42 8.39 8.37 8.44 8.30 8.25 8.42 8.38 8.29 8.25 8.42 8.32 8.33 8.30 8.20 8.17 8.17 8.10 6.97 8.30 8.23 7.52 7.54 4.55 1.81 8.32 8.28 8.21 7.86 3.02 DO %Sat 96.6 95.8 95.6 97.2 96.2 96.3 99.5 99.3 105.4 104.4 104.0 104.4 103.5 102.2 101.9 101.6 102.7 101.0 100.3 102.6 102.1 100.9 100.4 102.6 101.4 101.4 100.8 100.0 99.6 99.6 98.8 84.6 101.4 100.5 91.7 91.8 54.6 21.2 101.6 101.0 100.2 95.8 36.3 Cond umho/cm 52 54 53 53 53 52 52 53 52 52 53 52 53 53 53 52 52 53 52 52 53 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 55 PH std units 7.25 7.24 7.23 7.27 7.15 7.24 7.32 7.33 7.47 7.47 7.37 7.47 7.34 7.42 7.45 7.39 7.38 7.34 7.36 7.35 7.38 7.37 7.35 7.37 7.35 7.40 7.38 7.38 7.38 7.39 7.38 6.91 7.39 7.43 7.16 7.11 6.71 6.47 7.34 7.41 7.42 7.23 6.61 Secchi Depth meters 4.0 3.9 3.6 * 3.5 3.5 3.7 A-6 ------- Table A-l. In-situ measurements of water quality in the Spokane River during the field study of August 16-18, 1988. Date 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 Time hm 942 952 1002 1008 1435 1440 1445 1453 1458 1502 1509 1512 1516 1521 1528 1532 Station Location #8 Right #8 Mid #8 Left P.F. Dam #1 Right #lMid #lLeft #2 Right #2 Mid #2 Left #3 Right #3 Mid #3 Left #3A Right #3 A Mid #3 A Left Depth m 1.0 2.0 5.0 7.0 10.0 1.0 2.0 5.0 7.0 8.0 1.0 1.0 2.0 5.0 7.0 10.0 13.4 0.8 2.8 1.0 2.8 1.0 2.8 1.0 2.5 1.0 3.0 1.0 2.0 1.0 2.6 1.0 3.1 1.0 2.2 1.0 3.0 1.0 2.8 1.0 2.5 Temp C 21.82 21.85 21.83 21.79 21.38 21.88 21.88 21.85 21.82 21.75 21.78 21.91 21.92 21.88 21.83 21.19 18.58 21.37 21.34 21.34 21.32 21.63 21.31 21.40 21.14 21.15 21.13 21.19 21.16 21.12 21.05 21.05 21.00 21.04 21.02 21.33 21.09 21.23 20.99 21.15 21.00 DO mg/L 8.21 8.17 8.02 7.67 2.79 8.22 8.18 8.17 7.92 6.94 8.30 7.94 7.98 7.79 7.73 1.63 0.15 7.66 7.59 7.48 7.43 6.77 7.63 7.85 7.82 7.87 7.92 8.02 7.92 8.09 8.18 8.07 8.18 8.43 8.45 7.91 7.92 8.22 8.47 8.73 8.54 DO %Sat 100.1 99.6 97.7 93.4 33.7 100.3 99.9 99.6 96.5 84.5 101.1 97.0 97.5 95.0 94.2 19.6 1.7 92.5 91.7 90.4 89.8 82.2 92.1 94.9 94.1 94.7 95.2 96.6 95.3 97.3 98.3 97.0 98.2 101.3 101.5 95.5 95.2 99.1 101.7 105.1 102.5 Cond umho/cm 52 52 52 52 51 52 52 51 51 51 52 52 52 52 52 52 53 49 49 49 49 49 48 54 52 51 51 51 50 52 52 52 53 52 52 53 53 52 53 52 53 PH std units 7.39 7.39 7.38 7.25 6.60 7.20 7.31 7.35 7.26 6.96 7.37 7.26 7.26 7.21 7.15 6.54 6.35 7.48 7.35 7.14 7.18 8.20 7.37 7.28 7.33 7.27 7.36 7.44 7.48 7.35 7.46 7.26 7.43 7.46 7.56 7.06 7.22 7.35 7.64 7.36 7.52 Secchi Depth meters 4.0 A-7 ------- Table A-l. In-situ measurements of water quality in the Spokane River during the field study of August 16-18, 1988. Date 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 Time h m 1541 1545 1550 1555 1600 1610 1617 1623 1629 1638 1646 1700 Station Location #4 Right #4 Mid #4 Left #4A Right #4AMid MA Left #5 Right #5 Mid #5 Left #6 Right #6 Mid #6 Left Depth m 1.0 4.8 1.0 5.6 1.0 3.0 1.0 1.7 1.0 2.0 5.0 7.1 1.0 2.0 5.0 1.0 2.0 5.0 1.0 2.0 5.7 1.0 2.0 1.0 2.0 5.0 7.0 1.0 2.0 5.0 7.0 10.0 12.0 15.6 1.0 2.0 5.0 7.0 10.0 Temp C 22.33 21.30 21.97 21.26 21.74 21.58 22.26 22.13 22.30 22.07 21.72 21.67 22.37 22.20 21.72 22.47 22.01 21.85 22.35 22.07 21.81 22.44 22.04 22.38 22.25 21.93 21.87 22.50 22.21 21.95 21.82 21.14 20.34 18.90 22.56 22.47 21.94 21.83 21.13 DO mg/L 8.54 8.17 8.47 8.24 8.80 8.58 9.08 9.19 8.93 8.88 8.41 8.17 8.85 8.85 8.31 8.91 8.74 8.19 8.67 8.67 8.10 9.04 8.84 8.72 8.66 8.37 7.97 8.43 8.52 8.35 7.22 4.40 2.64 0.08 8.45 8.57 8.46 7.55 2.97 DO %Sat 105.0 98.6 103.5 99.4 107.2 104.1 111.6 112.7 109.9 108.7 102.3 99.4 109.0 108.7 101.1 109.9 106.9 99.9 106.7 106.1 98.7 111.4 108.2 107.4 106.4 102.2 97.3 104.1 104.6 102.0 88.0 52.9 31.3 1.0 104.5 105.8 103.4 92.0 35.8 Cond umho/cm 54 53 54 53 53 53 53 53 53 53 53 52 53 53 53 53 52 53 53 53 52 53 52 53 52 52 52 52 52 52 52 53 53 54 52 52 52 52 53 PH std units 7.34 7.57 7.35 7.52 7.41 7.48 7.69 8.02 7.64 7.66 7.29 7.25 7.61 7.60 7.52 7.66 7.55 7.47 7.43 7.40 7.50 7.70 7.87 7.68 7.69 7.77 7.47 7.47 7.61 7.60 7.29 6.71 6.35 6.39 7.52 7.61 7.45 7.04 6.48 Secchi Depth meters 3.8 3.8 3.8 • 3.5 3.8 A-8 ------- Table A-l. In-situ measurements of water quality in the Spokane River during the field study of August 16-18, 1988. Date 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/17/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 Time h m 1723 1731 1738 1740 630 637 644 655 657 700 706 714 722 730 733 736 Station Location #8 Right #8 Mid #8 Left P.F. Dam #1 Right tflMid #lLeft #2 Right #2 Mid #2 Left #3 Right #3 Mid #3 Left #3A Right #3 A Mid #3 A Left Depth m 1.0 2.0 5.0 7.0 9.0 1.0 2.0 5.0 1.0 1.0 2.0 5.0 8.0 10.0 12.0 1.1 2.8 1.3 2.0 1.0 2.6 1.1 3.1 1.1 3.2 1.1 2.2 1.1 2.9 1.1 3.5 1.1 2.4 1.1 3.0 1.1 3.1 1.1 2.8 Temp C 22.51 22.14 21.93 21.87 21.64 22.51 22.19 21.96 22.60 22.16 22.16 21.92 21.82 21.45 19.43 20.27 20.26 20.27 20.33 20.18 20.20 20.43 20.39 20.41 20.48 20.16 20.19 20.67 20.67 20.77 20.79 20.71 20.70 20.46 20.50 20.47 20.49 20.43 20.36 DO mg/L 8.50 8.38 7.79 7.59 3.38 8.41 8.54 7.55 8.88 8.03 8.03 7.65 6.11 3.88 0.14 8.04 8.01 7.89 7.73 7.80 7.64 7.32 7.28 7.38 7.36 7.70 7.64 7.75 7.57 7.80 7.68 7.82 7.72 7.48 7.36 7.94 7.88 7.94 7.92 DO %Sat 104.9 102.7 95.1 92.6 41.1 103.8 104.8 92.3 109.8 98.5 98.5 93.4 74.5 47.0 1.6 95.1 94.8 93.4 91.6 92.2 90.3 87.0 86.3 87.6 87.5 91.0 90.3 92.4 90.3 93.2 91.9 93.4 92.2 88.9 87.5 94.4 93.7 94.3 93.9 Cond umho/cm 52 52 52 52 52 52 52 51 52 53 53 52 51 51 51 49 48 48 49 49 48 61 61 55 51 49 50 55 54 55 54 54 54 52 52 52 52 53 52 PH std units 7.42 7.55 7.29 7.20 6.50 7.41 7.55 7.25 7.64 7.30 7.30 7.40 6.95 6.57 6.34 7.75 7.73 7.70 7.52 7.61 7.52 7.30 7.22 7.36 7.33 7.42 7.43 7.37 7.28 7.40 7.38 7.36 7.28 7.28 7.47 7.34 7.60 7.32 7.55 Secchi Depth meters • A-9 ------- Table A-l. In-situ measurements of water quality in the Spokane River during the field study of August 16-18, 1988. Date 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 Time hm 742 752 758 805 809 814 822 828 834 840 848 900 Station Location #4 Right #4 Mid #4 Left #4 A Right #4 A Mid #4ALeft #5 Right #5 Mid #5 Left #6 Right #6 Mid #6 Left Depth m 1.1 2.0 5.1 1.1 2.4 5.2 1.1 1.1 1.8 1.1 2.0 5.9 1.1 2.0 5.2 1.1 2.0 4.8 1.1 2.0 5.0 6.5 1.0 2.0 5.0 1.0 2.0 5.0 6.2 1.0 2.0 5.0 7.0 10.0 12.0 13.0 15.0 16.8 1.0 2.0 5.0 7.0 Temp C 20.91 20.95 20.93 20.91 20.93 20.90 20.99 21.26 21.26 21.48 21.48 21.41 21.50 21.51 21.50 21.50 21.54 21.52 21.53 21.53 21.47 21.44 21.56 21.55 21.47 21.63 21.66 21.63 21.62 21.67 21.67 21.66 21.30 20.30 20.39 19.76 18.96 18.86 21.64 21.66 21.64 21.63 DO mg/L 7.97 7.96 7.98 8.17 8.09 8.05 8.16 8.46 8.42 8.32 8.34 8.42 8.24 8.23 8.21 8.37 8.32 8.34 8.25 8.13 8.10 8.06 8.34 8.19 8.17 8.02 7.97 7.88 7.75 7.91 7.88 7.83 7.63 5.15 2.50 1.34 0.11 0.08 7.99 7.92 7.81 7.39 DO %Sat 95.5 95.5 95.7 97.8 97.0 96.4 97.9 102.1 101.6 100.8 101.0 101.9 99.8 99.7 99.5 101.4 100.9 101.1 100.0 98.5 98.1 97.6 101.2 99.4 98.9 97.4 96.9 95.7 94.1 96.1 95.8 95.2 92.1 61.0 29.7 15.7 1.3 1.0 97.1 96.2 94.9 89.7 Cond umho/cm 52 53 53 53 53 52 53 52 52 53 52 51 52 52 52 53 53 53 53 53 52 52 53 52 52 52 52 52 53 52 52 52 52 53 55 53 54 55 52 52 52 52 PH std units 7.46 7.46 7.47 7.44 7.44 7.47 7.39 7.57 7.51 7.50 7.38 7.61 7.42 7.43 7.49 7.47 7.47 7.57 7.49 7.53 7.55 7.42 7.52 7.47 7.55 7.37 7.41 7.42 7.31 7.34 7.42 7.43 6.73 6.52 6.38 6.38 6.37 6.38 7.30 7.31 7.37 7.23 Secchi Depth meters 3.9 4.0 '. 3.5 3.7 3.8 A-10 ------- Table A-l. In-situ measurements of water quality in the Spokane River during the field study of August 16-18,1988. Date 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 Time hm 922 930 933 940 1448 1455 1458 1507 1510 1513 1521 1525 1531 1537 1540 1546 Station Location #8 Right #8 Mid #8 Left P.P. Dam #1 Right tflMid #lLeft #2 Right #2 Mid #2 Left #3 Right #3 Mid #3 Left #3A Right #3AMid #3 A Left Depth m 1.0 2.0 5.0 7.0 8.7 1.0 2.0 4.4 1.0 1.0 2.0 5.0 7.0 10.0 1.0 2.7 1.0 1.9 1.0 2.6 1.0 2.0 1.0 2.8 1.0 2.2 1.0 2.7 1.0 3.3 1.0 1.5 1.0 3.3 1.0 3.0 1.0 2.8 Temp C 21.53 21.59 21.56 21.57 21.56 21.69 21.68 21.60 21.63 21.70 21.71 21.64 21.63 21.56 21.03 20.84 20.91 20.89 20.88 20.75 21.08 20.73 20.80 20.66 20.92 20.77 21.11 21.07 21.07 21.04 21.12 21.15 21.10 20.86 21.10 20.91 21.14 20.92 DO mg/L 7.41 7.31 7.52 6.96 7.16 7.68 7.65 8.05 8.16 7.34 7.28 7.19 7.22 6.28 8.07 8.11 7.96 7.96 8.08 8.05 7.93 7.87 7.87 7.97 8.03 7.99 7.91 8.04 7.84 7.92 8.42 8.47 7.55 7.64 8.00 8.26 8.26 8.75 DO %Sat 89.8 88.8 91.2 84.5 86.8 93.4 93.0 97.8 99.1 89.3 88.5 87.4 87.7 76.1 97.0 97.0 95.4 95.4 96.8 96.1 95.4 94.0 94.1 95.1 96.2 95.5 95.1 96.6 94.2 95.2 101.2 102.0 90.8 91.4 96.2 99.0 99.4 104.9 Cond umho/cm 51 52 51 51 51 52 51 51 52 51 52 52 52 53 49 49 49 49 49 49 53 52 50 51 50 51 54 53 53 53 53 53 52 53 53 53 54 53 pH std units 7.13 7.12 7.25 7.11 7.16 7.24 7.27 7.41 7.51 7.10 7.12 7.18 7.22 6.80 7.43 7.77 7.53 7.59 7.50 7.56 7.27 7.43 7.27 7.59 7.50 7.59 7.34 7.50 7.23 7.57 7.42 7.54 7.12 7.22 7.16 7.38 7.39 7.85 Secchi Depth meters 3.9 A-ll ------- Table A-l. In-situ measurements of water quality in the Spokane River during the field study of August 16-18, 1988. Date 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 Tune hm 1553 1601 1606 1614 1617 1625 1634 1637 1645 1652 1659 1708 Staloc #4 Right #4 Mid #4 Left #4A Right #4AMid #4ALeft #5 Right #5 Mid #5 Left #6 Right #6 Mid #6 Left Depth m 1.0 2.0 5.0 1.0 2.0 5.0 1.0 1.0 2.0 1.0 2.0 5.0 7.0 1.0 2.0 5.0 6.2 1.0 4.2 1.0 2.0 5.0 7.0 1.0 2.0 1.0 2.0 5.0 6.1 1.0 2.0 5.0 7.0 10.0 13.4 1.0 2.0 5.0 7.0 10.0 Temp C 21.56 21.41 20.82 21.53 21.45 20.80 21.46 22.03 21.80 21.96 21.80 21.48 21.47 22.06 21.99 21.51 21.50 21.92 21.62 22.20 21.85 21.58 21.51 22.31 22.10 22.03 21.99 21.75 21.70 22.25 22.25 21.96 21.70 21.38 19.93 22.32 22.30 21.88 21.71 21.69 DO mg/L 8.54 8.47 7.99 8.40 8.39 8.00 8.56 8.92 8.94 8.76 8.76 8.34 8.24 8.77 8.71 7.82 7.84 8.87 8.33 8.56 8.56 8.24 8.01 8.55 8.87 8.47 8.44 7.99 7.79 8.28 8.27 8.14 7.83 5.18 1.38 8.24 8.21 8.13 7.80 7.68 %Sat 103.5 102.5 95.6 101.8 101.5 95.6 103.7 109.1 109.0 107.0 106.7 101.0 99.8 107.3 106.5 94.8 95.0 108.3 101.2 105.1 104.4 100.0 97.0 105.2 108.7 103.7 103.2 97.3 94.7 101.7 101.6 99.5 95.3 62.6 16.2 101.4 101.0 99.2 94.9 93.4 Cond umho/cm 53 52 52 53 53 52 53 53 53 53 53 53 53 54 53 53 53 53 53 54 53 53 53 53 53 53 53 52 52 52 53 53 52 52 52 52 53 53 52 52 PH std units 7.53 7.65 7.60 7.59 7.62 7.43 7.56 7.80 7.94 7.72 7.82 7.48 7.38 7.68 7.81 7.24 7.20 7.99 7.55 7.59 7.68 7.47 7.26 7.77 8.00 7.59 7.65 7.37 7.21 7.50 7.58 7.39 7.20 6.69 6.30 7.45 7.48 7.36 7.17 7.10 Secchi Depth meters 3.9 3.4 3.7 3.7 A-12 ------- Table A-l. In-situ measurements of water quality in the Spokane River during the field study of August 16-18, 1988. Date 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 08/18/88 Time hm 1724 1732 1736 1739 Station Location #8 Right #8 Mid #8 Left P.F. Dam Depth m 1.0 2.0 5.0 7.0 8.5 1.0 2.0 5.0 1.0 1.0 2.0 5.0 7.0 10.0 12.5 Temp C 22.14 21.88 21.73 21.68 21.64 22.29 22.18 21.74 22.32 22.03 21.91 21.81 21.74 21.51 19.43 DO mg/L 7.96 8.12 7.56 7.23 7.16 7.80 7.85 7.40 8.11 7.78 8.10 7.87 7.43 4.72 0.11 DO %Sat 97.6 99.1 92.0 87.9 86.9 95.9 96.3 90.0 99.8 95.2 98.9 95.9 90.5 57.2 1.3 Cond umho/cm 53 52 52 52 52 52 53 52 52 53 53 52 52 52 51 pH std units 7.34 7.42 7.15 7.03 6.97 7.22 7.26 7.04 7.43 7.20 7.38 7.28 7.09 6.58 6.25 Secchi Depth meters A-13 ------- Table A-2. Laboratory measurements of water quality for receiving waters and point sources during August 16-18, 1988. EPA Lab# 340300 340301 340304 340307 340302 340303 340305 340306 340311 340316 340321 340312 340317 340322 340313 340318 340323 340314 340319 340324 340315 340320 340325 340326 BODS mg/L 8.00 5.60 12.40 8.40 8.60 12.20 0.73 0.42 0.44 0.89 0.79 0.78 1.28 0.98 1.04 1.25 0.92 1.27 1.70 1.13 1.08 BOD10 mg/L 17.60 29.60 27.60 38.60 36.80 47.20 0.59 0.89 0.79 1.14 1.12 1.47 1.48 1.30 1.55 1.67 1.39 1.83 1.96 1.22 1.50 BOD15 mg/L 114.00 90.40 72.80 23.60 8.20 24.00 0.96 0.82 1.09 1.43 1.40 1.94 1.87 1.64 1.75 2.01 1.78 2.20 2.28 1.76 2.10 BOD20 mg/L 74.00 98.00 86.80 15.40 17.60 21.60 0.95 1.15 1.21 1.91 1.84 2.34 2.07 1.90 2.03 2.16 2.03 2.30 2.48 1.85 2.25 BOD60 mg/L 1.75 1.92 2.89 2.66 3.09 2.88 3.54 3.05 3.35 2.98 A-14 ------- Table A-2. Laboratory measurements of water quality for receiving waters and point sources during August 16-18, 1988. EPA Lab# 340300 340301 340304 340307 340302 340303 340305 340306 340311 340316 340321 340312 340317 340322 340313 340318 340323 340314 340319 340324 340315 340320 340325 340326 NH3-N Total mg/1 0.01U 16.000 16.600 14.700 0.01U 0.055 0.055 0.058 0.01U 0.01U 0.01U 0.066 0.052 0.120 0.032 0.020 0.01U 0.01U 0.01U 0.01U 0.01U 0.01U 0.0 1U 0.0 1U 4O2NO3-r Total mg/1 0.01U 1.65 0.80 1.24 0.01U 25.00 26.00 25.50 0.01U 0.01U 0.01U 0.01 0.01M 0.01 0.0 1U 0.01U 0.01U 0.0 1U 0.01U 0.01U 0.0 1U 0.0 1U 0.01U 0.01U Kjel-N Total mg/1 0.04U 22.50 23.00 21.50 0.04U 1.92 2.06 2.50 0.10 0.14 0.12 0.32 0.24 0.34 0.26 0.22 0.18 0.26 0.20 0.18 0.20 0.16 0.20 0.06 Phos Total mg/1 0.01U 7.000 7.200 6.800 0.0 1U 9.900 10.200 10.200 0.01 M 0.010 0.010 0.056 0.044 0.066 0.064 0.044 0.044 0.040 0.038 0.040 0.030 0.030 0.036 0.010 A-15 ------- Table A-2. Laboratory measurements of water quality for receiving waters and point sources during August 16-18, 1988. EPA Lab# 340300 340301 340304 340307 340302 340303 340305 340306 340311 340316 340321 340312 340317 340322 340313 340318 340323 340314 340319 340324 340315 340320 340325 340326 Arsenic As-Total ug/1 0.6 1.4 1.8 1.4 0.5U 3.7 4.4 3.9 0.5U 0.5 0.5 0.6 0.5U 0.6 0.8 0.5 0.6 0.6 0.5 0.7 0.5U 0.7 0.5U 0.5U Mercury Hg-Total ug/1 0.08U 0.17 0.08U 0.08U 0.08U 0.21 0.08U 0.08U 0.44 0.45 0.08U 0.25 0.13 0.08U 0.30 0.19 0.08U 0.17 0.37 0.08U 0.11 0.15 0.08U 0.08U Cadmium Tot-Rec ug/1 0.1U 0.6 1.0 0.5 0.1U 0.2 2.0 0.2 0.7 0.4 0.6 0.7 0.4 0.4 0.3 0.3 0.3 0.3 0.3 1.3 0.2 0.3 0.2 0.1U Chromiurr Tot-Rec ug/l 0.5U 3.3 3.1 4.0 0.7 1.3 0.9 0.9 0.5U 0.7 0.5U 1.2 1.7 0.5U 1.8 0.7 0.5U 0.5U 1.2 1.9 0.7 0.7 1.4 0.5U Lead Tot-Rec ug/1 1U 5 7 4 1U 2 1 1 1 1 2 2 2 2 1 2 2 1 1 2 1 1 2 1U Iron Tot-Rec ug/1 7U 253 216 7U 102 105 109 25 22 18 27 24 23 34 32 34 28 30 84 25 28 37 7U Zinc Tot-Rec ug/1 5U 51 42 5U 43 38 40 75 63 67 '66 62 66 56 54 56 53 58 56 43 47 46 5U A-16 ------- Table A-2. Laboratory measurements of water quality for receiving waters and point sources during August 16-18, 1988. EPA Lab# 340300 340301 340304 340307 340302 340303 340305 340306 340311 340316 340321 340312 340317 340322 340313 340318 340323 340314 340319 340324 340315 340320 340325 340326 Cond@25C Meter umho/cm 1.5 672.0 674.0 677.0 1.7 538.0 538.0 538.0 53.8 53.8 52.8 57.6 57.0 58.3 57.5 57.8 56.2 56.9 56.2 56.6 56.0 55.3 55.2 1.8 pHLAB Meter Std Unts 4.40 6.74 6.72 6.74 4.20 6.80 6.80 6.74 6.25 5.95 5.97 6.30 6.22 6.17 6.37 6.27 6.20 6.35 6.25 6.30 6.35 6.34 6.39 4.28 Alk-Tot CaCO3 mg/1 0.1U 193.0 202.0 196.0 0.6 60.4 62.0 60.0 18.7 19.0 19.2 19.3 19.3 20.1 19.6 19.9 20.5 20.2 20.6 19.9 19.8 19.5 19.5 1.5 Hard-Tot CaCO3 mg/1 l.OU 103.0 110.0 l.OU 105.0 103.0 20.5 21.5 21.4 21.8 21.5 21.9 21.3 22.3 21.6 22.0 21.9 21.9 21.3 21.4 21.5 1.0 A-17 ------- Table A-3. Index for location of laboratory samples for receiving waters and point sources during the field study of August 16-18,1988. EPA Lab# 340300 340301 340304 340307 340302 340303 340305 340306 340311 340316 340321 340312 340317 340322 340313 340318 340323 340314 340319 340324 340315 340320 340325 340326 Date 88/08/16 88/08/16 88/08/17 88/08/18 88/08/16 88/08/16 88/08/17 88/08/18 88/08/16 88/08/17 88/08/18 88/08/16 88/08/17 88/08/18 88/08/16 88/08/17 88/08/18 88/08/16 88/08/17 88/08/18 88/08/16 88/08/17 88/08/18 88/08/18 Time 0840 0845 0845 0940 0950 0955 0930 0835 0630 0630 0630 0740 0715 0710 0835 0800 0745 0920 0845 0820 1020 0945 0920 Description Coeur d'Alene STP effl blank Coeur d'Alene STP effl (G) Coeur d'Alene STP effl (24) Coeur d'Alene STP effl (24) Hayden Lk STP effl blank HaydenLk STP effl (G) Hayden Lk STP effl (24) HaydenLk STP effl (24) Stal Stal Stal Sta3 Sta3 Sta3 Sta4 Sta4 Sta4 Sta5 Sta5 Sta5 Sta8 Sta8 Sta8 Transfer Blank River mile 111.0 111.0 111.0 111.1 111.1 111.1 108:6 108.6 108.6 106.5 106.5 106.5 104.4 104.4 104.4 102.0 102.0 102.0 A-18 ------- APPENDIX B Method for Estimating Cross-Sectional Averages of Water Quality To compute the mean values by station for dissolved oxygen (DO) concentration, percent DO saturation, water temperature and conductivity, the receiving water data for these parameters were aggregated using areal average techniques. The data were depth- averaged for each section (right, middle, and and left) of each station. Although DO, temperature, and conductivity were measured at increasing depths, these specific depths were not identical across sections or stations. Therefore, a method was sought that would produce estimates of parameter averages from the raw data. First, the river bed at each section was assumed to be 0.5 meters below the greatest depth where measurements were made (see Figs. B-l.l and B-1.2). Next, simple linear equations (expressing parameter values as a function of water depth) were fit to each successive pair of measurements. Parameter values were assumed to be constant in the intervals between the surface and the first measurement and between the last measurement and the river bed (Fig. B-1.3). Parameter averages were then computed from the areas under the resulting line segments. Assuming the section widths (right, middle, and left) were equal, the overall average for the station was computed by summing all of the areas, then dividing by the sum of the water depths. These data were further aggregated by summing over all the days on which measurements were made to obtain a station average of each parameter for the period of study. The results are presented as highly aggregated tranformations of the raw data. B-l ------- APPENDIX C Measurements obtained from the Citizens' Volunteer Monitoring Program The State of Idaho's Department of Environmental Quality, working in cooperation with local volunteers, have implemented a sampling program in the Spokane River at three locations in the Spokane River between Coeur d'Alene and Post Falls, Idaho. Data obtained from this program is given in Tables C-l, C-2, and C-3. ------- Table C-1. Water quality measurements in the Spokane River at the Cedars Site (approximate R.M. 111.1) obtained in the Gtizen's Volunteer Monitoring Program supported by the State of Idaho's Department of Environmental Quality. CVMP1988 CEDARS SITE DATE TIME MAXIMUM DEPTH (M) SECCffl DEPTH (M) TEMPERATURE (C)@ 1M DEPTH TEMPERATURE (Q@ 1M OFF BOTTOM DISSOLVED OXYGEN (MG/L)@ 1M DISSOLVED OXYGEN (MG/L)@ 1M OF! TOTAL AMMONIA (MG/L) TOTAL NO2+NO3 (MG/L) TOTAL KJELDAHL (MG/L) TOTAL PHOSPHORUS (MG/L) ORTHOPHOSPHORUS (MG/L) SPECIFIC CONDUCTANCE (UMHOS) CHLOROPHYLL a (UG/L) ZINC (UG/L) DEQDUPE 5/25/88 1100 2.75 2.75 13.3 12.2 12 12 0.013 0.014 0.11 0.011 52 90 6/27/88 1100 2.75 2.75 20 21 4 4 0.014 0.008 0.13 0.009 0.001 45 1.1 220 7/19/88 930 2.75 2.75 21 20 8 8 0.05 0.018 0.05 0.008 0.001 48 1.1 60 8/23/88 1000 2.6 2.6 20 20 7 8 0.007 0.02 0.09 0.009 0.002 51 1.7 30 9/27/88 1000 2.5 2.5 16 16 9 7 0.018 0.02 0.12 0.007 0.002 51 1 59 9/27/88 1000 2.5 2.5 16 16 9 7 0.021 0.016 0.11 0.008 0.002 53 1 10/18/88 1000 0.007 0.012 0.13 0.008 0.001 54 0.7 50 ------- Table C-2. Water quality measurements in the Spokane River at Harbor Island (approximate R.M. 106.5) obtained in the Citizen's Volunteer Monitoring Program supported by the State of Idaho's Department of Environmental Quality. SPOKANE RIVER CVMP 1988 HARBOR ISLAND DATE TIME MAXIMUM DEPTH (M) SECCHI DEPTH (M) TEMPERATURE (C)@ 1M DEPTH TEMPERATURE (C)@ 1M OFF BOTTOM DISSOLVED OXYGEN (MG/L)@ 1M DISSOLVED OXYGEN (MG/L)@ 1M OH TOTAL AMMONIA (MG/L) TOTAL NO2+NO3 (MG/L) TOTAL KJELDAHL (MG/L) TOTAL PHOSPHORUS (MG/L) ORTHOPHOSPHORUS (MG/L) SPECIFIC CONDUCTANCE (UMHOS) CHLOROPHYLL a (UG/L) ZINC (UG/L) FECAL COLIFORM (#/100 ML) DEQDUPE 5/25/88 1300 5.75 3.25 13.3 13.3 12 12 0.011 0.019 0.14 0.014 0.001 50 70 6/27/88 1200 5.75 3.75 20 21 9 9 0.027 0.017 0.13 0.017 0.007 46 1.6 140 7/19/88 1100 5.75 3.25 21 21 9 6 0.045 0.009 0.12 0.018 0.003 50 1.7 60 10 8/23/88 1030 5.8 2.75 21 21 4 8 0.026 0.027 0.19 0.037 0.022 55 6.5 30 9/27/88 1140 5.8 4.5 15 15 8 9 0.053 0.036 0.17 0.029 0.017 53 0.8 55 10 9/27/88 1140 5.8 4.5 15 15 8 9 0.045 0.027 0.14 0.027 0.018 53 1 10/18/88 1000 0.024 0.025 0.13 0.02 0.013 56 0.6 50 ------- Table C-3. Water quality measurements in the Spokane River at Post Falls Bridge (approximate R.M. 101.8) obtained in the Citizen's Volunteer Monitoring Program supported by the State of Idaho's Department of Environmental Quality. SPOKANE RIVER CVMP 1988 POST FALLS BRIDGE DATE TIME MAXIMUM DEPTH (M) SECCHI DEPTH (M) TEMPERATURE (C)@ 1M DEPTH TEMPERATURE (Q@ 1M OFF BOTTOM DISSOLVED OXYGEN (MG/L)@ 1M DISSOLVED OXYGEN (MG/L)@ 1M OF! TOTAL AMMONIA (MG/L) TOTAL NO2+NO3 (MG/L) TOTAL KJELD AHL (MG/L) TOTAL PHOSPHORUS (MG/L) ORTHOPHOSPHORUS (MG/L) SPECIFIC CONDUCTANCE (UMHOS) CHLOROPHYLL a (UG/L) ZINC (UG/L) DEQDUPE 5/25/88 1430 9 3.25 14 13.4 13 13 0.013 0.017 0.14 0.014 0.001 80 70 6/27/88 1200 8.6 3.5 19.7 21 5 5 0.019 0.021 0.12 0.016 0.005 48 220 140 7/19/88 1030 8.5 2.75 22.5 21 9 9 0.028 0.003 0.13 0.017 0.002 50 60 60 8/23/88 1115 8.6 4.75 22 22 10 8 0.01 0.016 0.12 0.028 0.01 55 30 30 9/27/88 1240 8.5 4.75 15 15 8 8 0.035 0.033 0.16 0.027 0.017 54 52 55 9/27/88 1240 8.5 4.75 15 15 8 8 0.038 0.034 0.18 0.027 0.018 53 1 10/18/88 0.024 0.018 0.16 0.023 0.014 56 50 50 ------- |