s 333.91 M26PRAR 2005 2005 ANNUAL REPORT to the GOVERNMENTS OF CANADA, UNITED STATES, SASKATCHEWAN AND MONTANA J Fife \ ^ — -^ J-^'^^J \ Rockglen ^^ - ^ ■ -— . « v^ %. ^ Coronach '5^ " ,*■ ^. "^ CANADA ^_ UNITED STATES ^4^ Saskatchewan ' Montana J.'gl ^~ E"' "^ Opheim :-^ 250 200 200 ""'^^ 150 100 ■^ -^ 100 SO 0 ''^^^ ^ 1 I 1 1 , , , , , , 0 : X >< g a >> n I 7-May 9-May 1 1-May 1 3-May 1 5-May 1 7-May 1 9-May >> a (I n >< a f in IS > n S (<4 29-May 31-May Figure 3.3 Cumulative Volume Hydrograpli of On-Demand Release. 3.2.5 Surface-Water Quality The 1981 report by the IJC to Governments recommended: For the March to October period, the maximum flow-weighted concentrations should not exceed 3.5 milligrams per litre (mg/L) for boron and 1,500 mg/Lfor TDS for any three consecutive months in the East Poplar River at the International Boundary. For the March to October period, the long-term average of flow-weighted concentrations should be 2.5 mg/L or less for boron, and 1,000 mg/L or less for TDS in the East Poplar River at the International Boundary. For the period prior to 1982, the three-month moving flow-weighted concentration (FWC) for boron and total dissolved solids (TDS) was calculated solely from monthly water-quahty monitoring results. Since the beginning of 1982, the USGS has monitored specific conductance daily in the East Poplar River at the International Boundary, making it possible to derive boron and TDS concentration using a linear regression relationship with specific conductance. In 2003, the Poplar River Bilateral Monitoring Committee decided to suspend much of the water-quality sampling program until it is warranted again. This suspension applied to all surface-water-quality sample collection activities by Environment Canada at the East Poplar River boundary station. The Committee has agreed to use the daily conductance data collected by the specific-conductance monitor as a surrogate for the monthly water-quality sampling program. Therefore, only four water-quality samples were collected for TDS and boron by the USGS in 2005. Hence, the three-month FWC for TDS and boron in 2005 were calculated using the two established equations (shown later in text) and the daily conductance data collected by the specific-conductance monitor installed at the East Poplar River at the International Boundary. The Bilateral Monitoring Committee adopted the approach that, for the purpose of comparison with the proposed IJC long-term objectives, the boron and TDS data are best plotted as a five-year moving FWC which is advanced one month at a time. Prior to 1988, long-term averages were calculated for a five-year period in which 2.5 years preceded and 2.5 years followed each plotted point. Beginning in 1988, the FWC was calculated from the 5-year period preceding each plotted point. For example, the FWC for December 2005 is calculated from data generated over the period December 2000 to December 2005. The calculations are based on the results of samples collected throughout the year, and are not restricted to only those collected during the months bracketing the period of irrigation (March to October) each year. 3.2.5.1 Total Dissolved Solids TDS is inversely related to streamflow at the East Poplar River at the International Boundary station. During periods of high runoff such as spring freshet, TDS decreases as the proportion of streamflow derived from ground water decreases. Conversely, during times of low streamflow (late summer, winter) the contribution of ground water to streamflow is proportionally greater. Because ground water has a higher ionic strength than the surface water entering the river, the TDS of the stream increases markedly during low-flow conditions. 10 Monthly average TDS concentrations derived from water-quality samples or the specific-conductance monitor readings are shown in Figure 3.4. The TDS concentrations in 2005 ranged from 770 mg/L on April 6 to 985 mg/L on October 15 which are below the proposed short-term objective of 1,500 mg/L. The three-month moving FWC for TDS for the period of record is presented in Figure 3.5. The TDS objectives have not been exceeded during the period of record. On inspection of the plot in Figure 3.5, it is apparent that the three-month moving FWC increased gradually, year by year, up until the spring runoff of 1997, when an exceptionally heavy snowmelt contributed sufficient water of low ionic strength to the river and the reservoir to dilute the accumulated salts built up in the system. Dissolved-solids concentrations in 2005 were similar to those recorded in 2004. In general, low spring runoff and higher contribution from ground water have kept the TDS level close to the long-term objective of 1,000 mg/L. The five-year moving FWC for TDS (Figure 3.6) did not exceed the long-term objective of 1,000 mg/L in 2005. The maximum monthly FWC in 2005 was about 954 mg/L, which is slightly higher than the 2004 maximum monthly value of 935 mg/L. The daily TDS values, as generated by linear regression from the daily specific-conductance readings, for the period January 1990 through December 2005 are shown in Figure 3.7. The data show an abrupt drop in TDS corresponding to the snowmelt runoff occurring during the spring of each year. The relationship between TDS and specific conductance based upon data collected from 1974 to 2003 is as follows: TDS = (0.624613813 x specific conductance) + 35.1841527 (R^ = 0.84, n = 617) Note: The above equation was used to derive the missing TDS water-quality sample data for 2005. These derived data are used in the current annual water-quality report. 11 1200 1000 966 "^ S 800 t (fl :g o E 600 ♦ 947 ♦ 891 ♦ £75 ♦ 2ZI " ♦ 947 ^22, ♦953 ♦~^«= ♦ 9^2 978 ♦ 770 200 Legend: 770 Grab-Sample Data k Figure 3.4: Monthly Mean TDS Concentration for 2005 Derived from Water-Quality Samples or Average Mid-Month Conductance Collected by Specific-Condutance Monitor at East Poplar River at the International Boundary 1800 1600 J 400 Shbrt-terrti Objective E ";;'i2oo 800 600 400 200 -Water-quality sample derived data Regression derived data Figure 3.5: Three-Month Moving Flow- Weighted Average TDS Concentration in 2005 for East Poplar River at the International Boundary 12 1200 1 1000 Long-t«rm Objective _, •> ■ -^ i ") _^ / ■ o 1.00 0.50 0.00 ♦ 1.72 Jl JL55 ♦1.37 Legend: 1.37 Grab- Sample Data 1.90 Figure 3.8: Monthly Mean Boron Concentration for 2005 - Derived from Water-Quality Sanples or Average Mid-month Conductance Data Collected by Specific Conductance Monitor at East Poplar River at the International Boundary Short-t arm Ob jective 0.5 ^/^ ■ Water-quality sample derived data Regression derived data ON a ^ t- 00 ^ O^ O^ 0\ O^ W c3 c9 ty K Tt, Xi 9 9 9 Figure 3.9: Three-Month Moving Flow-Weighted A\erage Boron Concentration in 2005 for East Poplar River at the International Boundary 15 p / ..y— — -^ --- -- -- — ^ -^ 1.5 1 . 0 1; 0 C3 ■•- O •.- Figure 3.10: Five-Year Moving Flow-Weighted Average Boron Concentration for East PoplarRiver at the International Boundary (regression-derived data) b) 0) 0) nJ TO oj i^ !^ !^ !^ i^ !^ Figure 3.1 1: Daily Boron Concentration, 1990 to 2005, East Poplar River at the International Boundary (regression-derived data) 16 3.2.5.3 Other Water-Quality Objectives Table 3.1 contains the multipurpose water-quality objectives for the East Poplar River at International Boundary, recommended by the International Poplar River Water Quality Board to the IJC. The table shows the number of samples collected for each parameter and the number of times over the course of the year that the objectives were exceeded. In the table, multiple replicate samples collected during the annual quality control exercise are treated as a single sample, but where an objective was exceeded in a replicate sample, this is charged against the single sample noted. As the table shows, all parameters were within the appropriate objectives. 17 Table 3.1 Recommended Water-Quality Objectives and Excursions, 2005 Sampling Program, East Poplar River at International Boundary (units in mg/L, except as otherwise noted) Parameter Objective No. of Samples Excursions USA Canada Objectives recommended by IJC to Governments || Boron, dissolved 3.5/2.5 (1) 4 0 0 Total Dissolved Solids 1,500/1,000(1) 4 0 0 Objectives recommended by Poplar River Bilateral Monitoring Committee to Governments 11 Cadmium, total 0.0012 4 0 0 Fluoride, dissolved 1.5 4 0 0 Lead, total 0.03 4 0 0 Nitrate 10.0 4 0 0 Oxygen, dissolved 4.0/5.0 (2) 4 0 0 Sodium adsorption ratio 10.0 4 0 0 Sulphate, dissolved 800.0 4 0 0 Zinc, total 0.03 4 0 0 Water temperature (Celsius) 30.0 (3) 4 0 0 pH (pH units) 6.5 (4) 4 0 0 ( 1 ) Three-month average of flow-weighted concentrations should be <3.5 mg/L boron and < 1 ,500 mg/L TDS. Five-year average of flow-weighted concentrations (March to October) should be <2.5 mg/L boron and <1 ,000 mg/L TDS. (2) 5.0 (minimum April 10 to May 15), 4.0 (minimum, remainder of the year). (3) Natural temperature (April 10 to May 15), <30 degrees Celsius (remainder of the year). (4) Less than 0.5 pH units above natural, minimum pH = 6.5. Note: No exceedences were noted in 2005. 18 vflfii,: 3.3 Ground Water 3.3.1 Operations - Saskatchewan SaskPower's supplementary supply continued to operate during 2005. Normally the majority of ground- water production occurs from fall to spring in order to minimize water losses during the summer. However, in the past few years production has been maintained through the summer period. In 2005, 4,321 cubic decameters (dam^) of ground water was produced, which is down from the 4,764 dam^ pumped in 2004. Production from 1991 to 2005 has averaged 4,840 dam^ per year. Prior to 1991, the well network was part of a dewatering network for coal mining operations, which resulted in the high production levels experienced in the early to mid 1980 as shown in Figure 3.12. With the drought of the late 1980 and early 1990, it was evident that there was a continued need for ground water to supplement water levels in Cookson Reservoir. Consequently, the wells were taken over by SaskPower for use as a supplementary supply. 1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 Year Figure 3.12 Supplementary Water Supply 19 SaskPower has an approval for the supplementary supply project to produce an annual volume of 5,500 dam''/year. The supplementary supply well network currently consists of 21 wells with a total of 10 discharge points. No wells were added or deleted from the well field during the year. In addition to the supplementary supply, SaskPower also operates the Soil Salinity Project south of Morrison Dam. The project was initiated in 1989 to alleviate soil salinity which had developed below the dam. The salinity project consists of a network of production wells discharging into the cooling water canal. This in turn discharges to Cookson Reservoir. Ongoing operational difficulties with the salinity wells resulted in a continued decline in the annual volume pumped (Figure 3.13). However, a well rehabilitation program has been initiated and as a result production in 2005 was 790 dam'' This represents a significant increase from 557 dam^ in 2004 and 426 dam^ in 2003. The majority of water pumped came from wells on the east side of the river. The 2005 production level was still substantially lower than the peak production level of almost 1,100 dam'' in 1994. In 2003 all production was from one well, but this increased to six wells in 2005. In 2006, one well will be decommissioned and an additional well will be rehabilitated. 20 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 Year Figure 3.13 Pumpage from Salinity Control Project 3.3.2 Ground-Water Monitoring Equivalent geologic formations present in Saskatchewan and Montana have different names. A list of the corresponding formation names is provided in Table 3.2. Table 3.2 Geologic Formation Name Equivalence between Saskatchewan and Montana Formation Location Geologic Formation Name Saskatchewan Eastend to Whitemud Frenchman Ravenscrag Alluvium Montana Fox Hills Hell Creek Fort Union Alluvium 21 3.3.2.1 Saskatchewan In 2003, SaskPower reduced its monitoring network from 180 to about 85 piezometers. Saskatchewan Environment approved this reduction based on modelling studies undertaken by SaskPower. The goal of the Salinity Project is to lower ground-water levels in the Empress sands below Morrison Dam two to three metres, which is roughly equivalent to pre-reservoir levels. Production from 1990 to 1995 ranged between 900 and 1,100 dam'^/year and consequently the drawdown objectives were achieved in 1995 and 1996. Declining production from 1995 until 2004 resulted in a continual reduction in the cone of depression. By 2003 the drawdown cone of depression was negligible. The drawdown cone increased somewhat in 2004 and 2005 due to the increased production, but is still limited in extent and magnitude. Figures 3.14 and 3.15 show hydrographs for Hart Coal seam monitoring wells near the International Boundary. These hydrographs illustrate that there have been no significant changes in water level in the Hart Coal seam near the boundary in the past 10 years. 22 810 Cookson Reservoir Supplementary Supply Groundwater Monitoring . _ 790 1 ■ ■ ■ ■■ «, ■•■l ■"■■ ■■■< ■■1 ■ ■■i ■■■" ■.1 ■ ■! mi ♦ ■ 1 ' J _. A 770 .♦' ♦% ♦♦. < 4 :r: • ♦ i • *< * * ♦♦• ♦ ■ ♦♦♦' ♦♦♦' 750 / / / / / / / / / / / / / / / / /> / / > ^ ^ ^ ^ ^ ,J* ^ ^(> ^ ^ ^ ^ ^ ^ ^d ^C^ ^6 ^(T -M811 -•-M782 -*-M510A Figure 3.14 Hydrograph of Selected Wells - Cookson Reservoir Supplementary Ground- water Monitoring Network Cookson Reservoir Supplementary Supply Groundwater Monitoring IMII^ nmm ^^ ^^^ i«^ tLtm L MAM mum ^ ,./ aMk A •n ■» P^ ^ ^ T ^ J> ^^ J^ sO ^o ^<* ^c> ^d ^c^ ^<;J ^d ^ci ^c^ ^d ^c^ ^<^ ^c^ ^c^ ^c^ ^<:> ^qN ^cT -M492A -•-M507 -*-M509 Figure 3.15 Hydrograph of Selected Well - Cookson Reservoir Supplementary Supply Ground-water Monitoring Network 23 3.3.2.2 Montana Water levels in monitoring wells (6, 7, 9, 13, 16, 17, 19, and 22) that penetrate the Fort Union Formation and/or the Hart Coal Seam rose during 1997 and 1998, and then levelled off or fell between 1999 and the end of 2003. Heavy snow accumulation and subsequent melting caused water levels to rise to near record highs in wells 6, 7, 9, 16, 19, and 22 during 2004 and 2005. Water levels in all of these wells except well 9 declined during 2005. There appeared to be no short-term responses to the snow melt in wells 13 and 17, but water levels in these wells have slowly risen since late 2003. Hydrographs from selected Fort Union and Hart Coal Seam wells (6, 7, 17, and 19) are shown in Figure 3.16. Offsets noted in the legend have been applied to the data to separate the traces and make the hydrographs more readable. Hydrographs of selected Fort Union/Hart Coal Seam wells (6, 7, 17, and 19) are shown in Figure 3.16. -*»**«^*«<, ^^^^'^^^^X*^ o>OT-c\joO'*mtor-oocnO'-c\jcO'«tincor~-ooO)0'-050>0)050>Cn050^CpOOCpCpCpCp cccccccccccccccccccccccccccccc ajcC(0<0(Oed(Dcococo Year —•-Well 6 (GWIC 4227: +10 ft offset) -s-Well 7 (GWIC 4267: +7 ft offset) -A-Well 17 (GWIC 4297: -3 ft offset) -»*-Well 19 (GWIC 4290: -5 ft offset) Figure 3.16 Hydrograph of Selected Wells - Fort Union and Hart Coal Aquifers 24 The potentiometric surface in the Fox Hills/Hell Creek artesian aquifer (well 11, Figure 3.17) has shown little fluctuation or change during the 1979-2005 monitoring period. Water levels in monitoring wells (5, 8, 10, 23, and 24) that penetrate alluvium and/or outwash show seasonal change caused by climate and/or precipitation. Water levels in all of the wells responded to the heavy snow accumulation and melt in early 2004. Water levels in well 23 dropped back to late 2003 levels by the end of 2004 and water levels in wells 10 and 24 returned to pre-melt elevations in 2005. Water levels in wells 5 and 8 remain above elevations observed in 2002-2003. Hydrographs from selected alluvial wells (10, 23, and 24) and the Fox Hills/Hell Creek well (11) are shown in Figure 3.17. Offsets noted in the legend have been applied to the data to separate the traces and make the hydrographs more readable. Measurements from wells 11 and 24 where the wellhead was noted as being frozen are not included. V»v*^ ♦^ ''''''''''''^''''^-\^.f^^A/ Au:^^A.:/^V ■^WK>^A>Ar^^'^AAft^>^^ ^ -5-0-5-3-3-3-3-5-5-3-3-3-5-3-3-3-3-3-5-5 Year -Well 10 (GWIC 4340: 0 ft offset) -a— Well 11 (GWIC 4329: +3 ft offset) -Well 23 (GWIC 124105: + 2 ft offset) -»«-Well 24 (GWIC 144835: -3 ft offset) Figure 3.17 Hydrograph of Selected Wells - Alluvium and Fox Hills/Hell Creek Aquifers 25 3.3.3 Ground-Water Quality 3.3.3.1 Saskatchewan The water quality from the Supplementary Supply Project discharge points has been consistent with no trends indicated. A summary of the more frequently tested parameters during 2005 is provided in Table 3.3. Result averages for the 1992-2004 period are also included in this table for comparison. TABLE 3.3 Water-Quality Statistics for Water Pumped from Supplementary Water Supply Project Wells* 1992 to 2005 Average 2005 II Average pH (units) 8.0 8.2 Conductivity (//s/cm) 1,301 1,280 Total Dissolved Solids 900 800 Total Suspended Solids 12 16 Boron 1.2 1.1 Sodium 177 166 Cyanide (i^g/L) 0.0007 <0.000001 Iron 0.2 0.3 Manganese 0.1 0.1 1 Mercury (ng/L) 0.09 <0.05 Calcium 71 53 Magnesium 51 60 Sulfate 269 290 Nitrate .06 0.04 All units mg/L unless othenwise noted. *Sampled at Site "C3" on Girard Creek. <, less than. Average results from the common discharge point for the Salinity Control Project for 2005, plus an average of the 1992-2004 results are provided in Table 3.4. Results have remained relatively consistent since 1992. 26 TABLE 3.4 Water-Quality Statistics for Water Pumped from Salinity Control Project Wells Sampled at the Discharge Pipe* 1 1992-2005 Average 2005 Average pH (units) 7.5 7.7 Conductivity (/xs/cm) 1,434 1,492 Total Dissolved Solids 991 1,011 Boron 1.6 1.6 Calcium 104 94 Magnesium 60 52 Sodium 152 170 Potassium 7.4 7.3 Arsenic (/Ltg/L) 11.4 10.2 Aluminum 0.07 <0.01 Barium 0.037 0.026 Cadmium 0.019 <0.001 Iron 4.1 3.7 Manganese 0.13 0.12 Molybdenum 0.019 <0.001 Strontium 1.774 1.5 Vanadium 0.018 <0.001 Uranium (figfL) 0.513 0.9 Mercury (/i/L) 0.09 <0.05 Sulfate 321 290 Chloride 6.3 8 Nitrate 0.005 <0.01 •"AH concentrations are mg/L unless otherwise noted. <, less than. 27 Leachate movement through the ash lagoon liner systems can potentially affect ground-water quality in the vicinity of the ash lagoons. The piezometers listed in the Technical Monitoring Schedules are used to assess leachate movement and calculate seepage rates. Piezometric water level, boron, and chloride are the chosen indicator parameters to assess leachate movement. The ground-water monitoring program was expanded in 1994 as a result of Ash Lagoon # 3 South construction. In total 20 new pneumatic piezometers and 28 new standpipe piezometers were completed within their target zones. Testing of these piezometers began in 1995. The limited data so far does not show any unusual or unexpected values. Due to the sampling reduction approved by Sask Environment in late 2003 there are some piezometers that are no longer monitored. Of the piezometers previously referenced in this report piezometers C867A, C868A, C871A, C886A, C887A, C868B, C869C, C766, and C767 are no longer monitored. The chemistry of water immediately above the liner systems is expected to differ from the surface water of the lagoons. Meaningful information is only available from piezometers installed within Ash Lagoon # 1 where ash has been deposited for many years. Future monitoring of all piezometers completed above the lagoon liner systems will continue with the purpose of confirming the boron trend noted above and to improve the understanding of leachate quality and flow from the ash lagoons. The piezometric surface measurements for the oxidized till continue to show the presence of a ground- water mound beneath the ash lagoons. The mound extends from the center of the Ash Lagoon # 1 to the southeast side of Ash Lagoon # 2. Isolated ground-water mounds have developed within the area of the oxidized ground-water mound. Piezometers located in the oxidized till suggest limited leachate activity. No seepage activity is evident in the unoxidized till. The greatest changes in chloride and boron concentrations within the oxidized till have occurred where piezometric levels have changed the most. Although increasing water levels do not automatically suggest that the water affecting the piezometers is leachate, changing piezometric levels do suggest ground-water movement. On the west side of the Polishing Pond, the boron levels have changed only 28 slightly in the oxidized till piezometers C728A and C728D, where the chloride levels have changed more significantly. The chloride level for C728A has decreased from 403 mg/L in 1983 to 232 mg/L in 2004. The chloride level for C728D has increased from 185 mg/L in 1983 to 376 mg/L in 2004. Although these piezometers are close in proximity and installed at the same level, they are being influenced by different water. Chloride results for C728A suggest initial seepage and it is to be expected that over time the same observation will be seen in C728D. The piezometric surface of the Empress Gravel indicates a regional flow from northwest to southeast below Morrison Dam. As a general observation, Empress piezometers respond to changing reservoir levels. Results for the Empress layer do not indicate seepage activity with the majority of the analyses showing little real change in boron or chloride results. Sand lens piezometers C712B and C766 are located between the polishing pond and the cooling water canal. C767 is located on the top of dyke G and C766 and C712B are located at the toe of dyke G. These piezometers have historically been of interest as the sand lens provides a preferential pathway for leachate migration of boron concentrations. C766 shows an increasing trend up to October 1988 with a peak of 43.0 mg/L in April 1995. Since 1995 the boron levels have declined modestly and have remained between 25 and 38 mg/L. Up to April 1988, the boron concentration for C767 was increasing and peaked at 49.4 mg/L. Since this peak, the boron concentration steadily decreased to the end of 1991 where it levelled off near 5 mg/L and has since remained with one exception, a concentration of 1L7 mg/L in October 2000. Piezometer C712B has been monitored for several years. Historically, boron levels were below 1 mg/L. From 1992 to 2005, boron levels have remained relatively steady around between 12 and 20 mg/L. 29 3.3.3.2 Montana Samples were collected from monitoring wells 7, 16, and 24 during 2005. Well 7 is completed in Hart Coal, well 16 is completed in the Fort Union Formation, and well 24 is completed in alluvium. TDS concentrations in samples collected in 2005 from wells 7 and 24 were less than reported in 2004 and similar to those observed in 2003. Changes in TDS with time for wells 7, 16, and 24 are shown in Figure 3.18. 800 S 750 "3 » 700 a. w 1 ^^° = 600 S £ 550 M 1 500 o w ■§ 450 8 400 Q « 350 o 300 0 ^ \ \ \ r ^ \^ \ a -^ ^ ^ "^ -^ / ^ ~-o / s^ \ /' -id N. ,^ \ ^ V b "* -A s. --♦ ^» V 7 ^ \ ^ -A V A ^ -A V A --A -^ / r .^ N, A > -J. / \ \ / \ / \ / \ / ^K 1 V oo>0'-cjn-«i-inOi-c\ico-<>-io-c\jcO'>tm 0)0>o>o>0)0000000oc>o ICCCCCCCCCCCCCCC ccccccccccccccc :>-J-5-5-5-3-3-3-3-3-3-5-3->-5-3 -J-J-J-J-J-J-J-J-J-J-J-J-J-J-J Date -e-Well 16(GWIC4211) -s-Well 24 (GWIC 144835) -A-Well 7 (GWIC 4267) Figure 3.18 Total Dissolved Solids in Samples from Montana Wells. 30 3.4 Cookson Reservoir 3.4.1 Storage On January 1, 2005, Cookson Reservoir storage was 38, 420 dam'' or 89 % of the full supply volume. The 2005 maximum, minimum, and period elevations and volumes are shown in Table 3.5. Spring inflows into the reservoir were well below normal in 2005. A release was made in May to meet the recommended Poplar River basin demand release for the 2004-2005 apportionment year. No releases were required to maintain the recommended apportionment target flow at the International Boundary for the remainder of the year. In addition to runoff, reservoir levels were augmented by ground-water pumping. Wells in the abandoned west block mine site supplied 4,321 dam^ to Girard Creek. It is estimated that less than 70% of this flow volume reached Cookson Reservoir. Wells in the soil salinity project area supplied 790 dam^n 2005. Table 3.5 Cookson Reservoir Storage Statistics for 2005 Date Elevation (m) Contents (dam^) January 1 752.34 38, 420 April 10 (Maximum) 752.49 39, 520 November 27 (Minimum) 751.58 33, 060 [December 31 751.61 33, 250 JFull Supply Level 753.00 43,410 31 The Poplar River Power Station is dependent on water from Cookson Reservoir for cooling. Power plant operation is not adversely affected until reservoir levels drop below 749.0 metres, ^^he dead storage level for cooling water used in the generation process is 745.0 metres. The 2005 recorded levels and associated operating levels are shown in Figure 3.19. 2005 Cookson Reservoir Daily Mean Water Levels Full Supply Level -Ten Year Median Level 2005 Minimum Desired Operating Level Minimum Useable Storage Level Feb Mar Apr May Jul Aug Sep Oct Nov Dec 19100 *£ c « o E 8i Figure 3.19 Cookson Reservoir Daily Mean Water Levels for 2005 and Median Daily Water Levels, 1995-2004 3.4.2 Water Quality The period from 1987 to 1993 saw very low volumes of surface-water runoff to Cookson Reservoir. Consequently, total dissolved solids (TDS) in the reservoir increased steadily from approximately 780 mg/L to over 1,800 mg/L. Since 1993, higher runoff volumes have improved reservoir water quality. Since 1997, the TDS levels in the reservoir have generally remained below 1,000 mg/L. The average TDS level in Cookson Reservoir in 2005 was 1,033 mg/L, up slightly from the 2004 average level of 967 mg/L but still below past levels. 32 3.5 Air Quality SaskPower's ambient SO2 monitoring for 2005 recorded no values greater than Saskatchewan Environment's one-hour average standard of 0.17 ppm and the 24-hour average standard of 0.06 ppm. The ambient SO2 monitor was replaced in January 2001 which has greatly improved the availability of this information. The 2005 geometric mean for the high-volume suspended-particulate sampler was 14.5/ig/m^ and 2005 was the fourteenth consecutive year of below-average standard particulate readings. 3.6 Quality Control 3.6.1 Streamflow Current-meter discharge measurements were made at the East Poplar River at International Boundary site on September 6, 2005 by personnel from the U.S. Geological Survey (USGS) and Environment Canada (EC) to confirm streamflow measurement comparability. Data from the two current-meter discharge measurements are available in Table 3.6. Table 3.6 Streamflow Measurement Results for September 6, 2005 Agency Time CST Width (m) Mean Area Velocity (m/s) Gauge Height (m) Discharge (m'/s) EC 0935 1.05 0.130 0.225 1.743 0.030 USGS 1026 1.04 0.121 0.240 1.743 0.029 3.6.2 Water Quality Quality-control sampling was not performed in 2005 at the East Poplar River at International Boundary due to suspension in collection of surface-water-quality samples by Environment Canada. 33 ANNEX 1 POPLAR RIVER COOPERATIVE MONITORING ARRANGEMENT CANADA-UNITED STATES Al-1 September 23, 1980 POPLAR RIVER COOPERATIVE MONITORING ARRANGEMENT I. PURPOSE This Arrangement will provide for the exchange of data collected as described in the attached Technical Monitoring Schedules in water-quality, water quantity and air quality monitoring programs being conducted in Canada and the United States at or near the International Boundary in response to SaskPower development. This Arrangement will also provide for the dissemination of the data in each country and will assure its comparability and assist in its technical interpretation. The Arrangement will replace and expand upon the quarterly information exchange program instituted between Canada and the United States in 1976. II. PARTICIPATING GOVERNMENTS Governments and government agencies participating in the Arrangement are: Government of Canada: Environment Canada Government of the Province of Saskatchewan: Saskatchewan Environment and Resource Management Government of the United States of America: United States Geological Survey Government of the State of Montana: Executive Office III. POPLAR RIVER MONITORING COMMITTEE: TERMS OF REFERENCE A binational committee called the Poplar River Bilateral Monitoring Committee will be established to carry out responsibilities assigned to it under this Arrangement. The Committee will operate in accordance with the following terms of reference: Al-3 A. Membership The Committee will be composed of four representatives, one from each of the participating Governments. It will be jointly chaired by the Government of Canada and the Government of the United States. There will be a Canadian Section and a United States Section. The participating Governments will notify each other of any changes in membership on the Committee. Co-chairpersons may by mutual agreement invite agency technical experts to participate in the work of the Committee. The Governor of the State of Montana may also appoint a chief elective official of local government to participate as an ex-officio member of the Committee in its technical deliberations. The Saskatchewan Minister of the Environment may also appoint a similar local representative. B. Functions of the Committee The role of the Committee will be to fulfil the purpose of the Arrangement by ensuring the exchange of monitored data in accordance with the attached Technical Monitoring Schedules, and its collation and technical interpretation in reports to Governments on implementation of the Arrangement. In addition, the Committee will review the existing monitoring systems to ensure their adequacy and may recommend to the Canadian and United States Governments any modifications to improve the Technical Monitoring Schedules. 1. Information Exchange Each Co-chairperson will be responsible for transmitting to his counterpart Co-chairperson on a regular, and not less than quarterly basis, the data provided by the cooperative monitoring agencies in accordance with the Technical Monitoring Schedules. AI-4 2. Reports (a) The Committee will prepare a joint Annual Report to the participating governments, and may at any time prepare joint Special Reports. (b) Annual Reports will i) summarize the main activities of the Committee in the year under Report and the data which has been exchanged under the Arrangement; ii) draw to the attention of the participating governments any definitive changes in the monitored parameters, based on collation and technical interpretation of exchanged data (i.e. the utilization of summary, statistical and other appropriate techniques); iii) draw to the attention of the participating governments any recommendations regarding the adequacy or redundancy of any scheduled monitoring operations and any proposals regarding modifications to the Technical Monitoring Schedules, based on a continuing review of the monitoring programs including analytical methods to ensure their comparability. (c) Special Reports may, at any time, draw to the attention of participating governments definitive changes in monitored parameters which may require immediate attention. (d) Preparation of Reports Reports will be prepared following consultation with all committee members and will be signed by all Committee members. Reports will be separately forwarded by the Committee Co-chairmen to the participating governments. All annual and special reports will be so distributed. Al-5 3. Activities of Canadian and United States Sections The Canadian and United States section will be separately responsible for: (a) dissemination of information within their respective countries, and the arrangement of any discussion required with local elected officials; (b) verification that monitoring operations are being carried out in accordance with the Technical Monitoring Schedules by cooperating monitoring agencies; (c) receipt and collation of monitored data generated by the cooperating monitoring agencies in their respective countries as specified in the Technical Monitoring Schedules; (d) if necessary, drawing to the attention of the appropriate government in their respective countries any failure to comply with a scheduled monitoring function on the part of any cooperating agency under the jurisdiction of that government, and requesting that appropriate corrective action be taken. rV. PROVISION OF DATA In order to ensure that the Committee is able to carry out the terms of this Arrangement, the participating governments will use their best efforts to have cooperating monitoring agencies, in their respective jurisdictions provide on an ongoing basis all scheduled monitored data for which they are responsible. V. TERMS OF THE ARRANGEMENT The Arrangement will be effective for an initial term of five years and may be amended by agreement of the participating governments. It will be subject to review at the end of the initial term and will be renewed thereafter for as long as it is required by the participating governments. Al-6 ANNEX 2 POPLAR RIVER COOPERATIVE MONITORING ARRANGEMENT TECHNICAL MONITORING SCHEDULES 2006 CANADA-UNITED STATES A2-1 TABLE OF CONTENTS PREAMBLE A2 - 5 CANADA STREAMFLOW MONITORING A2 - 8 SURFACE-WATER-QUALITY MONITORING A2 - 10 GROUND-WATER PIEZOMETERS TO MONITOR POTENTIAL DRAWDOWN DUE TO COAL-SEAM DEWATERING NEAR THE INTERNATIONAL BOUNDARY A2 - 14 GROUND-WATER PIEZOMETER MONITORING - POWER STATION AREA A2 - 16 GROUND-WATER PIEZOMETER MONITORING - ASH LAGOON AREA I WATER LEVEL A2-18 WATER QUALITY A2 - 19 I AMBIENT AIR-QUALITY MONITORING A2 - 22 I UNITED STATES I I STREAMFLOW MONITORING A2 - 26 I I SURFACE-WATER-QUALITY MONITORING A2 - 28 k I GROUND-WATER-QUALITY MONITORING A2 - 30 t I GROUND-WATER LEVELS TO MONITOR POTENTIAL DRAWDOWN DUE TO COAL-SEAM DEWATERING A2 - 32 A2-3 PREAMBLE The Technical Monitoring Schedule lists those water quantity, water-quality and air quality monitoring locations and parameters which form the basis for information exchange and reporting to Governments. The structure of the Committee responsible for ensuring the exchange takes place is described in the Poplar River Cooperative Monitoring Arrangement. The monitoring locations and parameters listed herein have been reviewed by the Poplar River Bilateral Monitoring Committee and represent the basic technical information needed to identify any definitive changes in water quantity, water quality and air quality at the International Boundary. The Schedule was initially submitted to Governments for approval as an attachment to the 1981 report to Governments. Changes in the sampling locations and parameters may be made by Governments based on the recommendations of the Committee. Additional information has been or is being collected by agencies on both sides of the International Boundary, primarily for project management or basin-wide baseline data purposes. This additional information is usually available upon request from the collecting agency and forms part of the pool of technical information which may be drawn upon by Governments for specific study purposes. Examples of additional information are water-quantity, water-quality, ground-water and air-quality data collected at points in the Poplar River basin not of direct concern to the Committee. In addition, supplemental information on parameters such as vegetation, soils, fish and waterfowl populations and aquatic vegetation has been collected on either a routine or specific-studies basis by various agencies. A2-5 POPLAR RIVER COOPERATIVE MONITORING ARRANGEMENT TECHNICAL MONITORING SCHEDULES 2006 CANADA A2-7 STREAMFLOW MONITORING Daily mean discharge or levels and instantaneous monthly extremes as normally published in surface-water-data publications. Responsible Agencies: Environment Canada; Saskatchewan Waterslted Authority No. on Map Station No. Station Name 1* 11AE003 (06178500) East Poplar River at International Boundary 2 11AE013*** Cookson Reservoir near Coronach 3 11AE015*** Girard Creek near Coronach Cookson Reservoir 4 11AE014*** East Poplar River above Cookson Reservoir 5 Fife Lake Overflow** 6* 11AE008 (06178000) Poplar River at International Boundary * International gauging station. ** Miscellaneous measurements of outflow to be made by Saskatchewan Watershed Authority (SWA) during periods of outflow only. *** SWA took over the monitoring responsibility effective July 1/92. A2-8 0 5 10 15 KILOMETERS HYDROMETRIC GAUGING STATIONS (CANADA) A2-9 SURFACE-WATER-QUALITY MONITORING Sampling Lxjcations Responsible Agency: Environment Canada No. on Map Station No. Station Name 1 00SA11AE0008 Suspended East Poplar River at International Boundary Responsible Agency: Saskatchewan Environment 1 Data collected by: Sask Power No. on Map Station No. Station Name 2 12386 East Poplar River at Culvert immediately below Discontinued Cookson Reservoir 3 12368 Cookson Reservoir near Dam 4 12377 Discontinued Upper End of Cookson Reservoir at Highway 36 5 12412 Discontinued Girard Creek at Coronach, Reservoir Outflow 6 7904 Fife Lake Outflow* *Sampled only when outflow occurs for a 2-week period, which does not occur every year. A2-10 / J LEGEND A SASKATCHEWAN ENVIRONMENT ■ ENVIRONMENT CANADA 0 5 10 16 KILOMETERS I ' T-" S SURFACE-WATER-QUALITY MONITORING STATIONS (CANADi^ A2-11 PARAMETERS T^^sponsiH^^gency^Environmen^ai^^ ENVIRODAT* Code Analytical Method Sampling Frequency Station No. 1 10151 Alkalinily-phenolphlhalein Potentiometric Titration SUS 10111 Alkalinity-total Potentiometric Titration SUS 13102 Aluminum-dissolved AA-Direcl SUS 13302 Aluminum-extracted AA-Direct SUS 07540 Ammonia-total Automated Colourimetric SUS 33108 Arsenic-dissolved ICAP-hydride SUS 56001 Barium-total AA-Direct SUS 06201 Bicarbonates Calculated SUS 05211 Boron-dissolved ICAP SUS %360 Bromoxynil Gas Chromatography SUS 48002 Cadmium- total AA Solvent ExU^action SUS 20103 Calcium AA-Direct SUS 06104 Carbon-dissolved organic Automated IR Detection SUS 06901 Carbon-particulate Elemental Analyzer SUS 06002 Carbon-total organic Calculated SUS 06301 Carbonates Calculated SUS 17206 Chloride Automated Colourimeuic SUS 06717 Chlorophyll a Spectrophotometric SUS 24003 Chromium-total AA-Solvenl Extraction SUS 27002 Cobalt-toul AA-Solvent Extraction SUS 36012 Coliform-fecal Membrane Filtration SUS 36002 Coliform-total Membrane Filtration SUS 02021 Colour Comparator SUS 02041 Conductivity Wheatstone Bridge SUS 06610 Cyanide Automated UV-Colourimetric SUS 09117 Fluoride-dissolved Electrometric SUS 06401 Free Carbon Dioxide Calculated SUS 10602 Hardness Calculated SUS 17811 Hexachlorobenzene Gas Chromatography SUS 08501 Hydroxide Calculated SUS 26104 Iron-dissolved AA-Direct SUS 82002 Lead-total AA-Solvent Extraction SUS 12102 Magnesium AA-Direct SUS 25104 Manganese-dissolved AA-Direct SUS 07901 N-particulate Elemental Analyzer SUS 07651 N-total dissolved Automated UV Colourimetric SUS 10401 NFR Gravimetric SUS 28002 Nickel-toul AA-Solvent Extfaction SUS 07110 Nitrate/Nin-ite Colourimetric SUS 07603 Nitrogen-total Calculated SUS 10650 Non-Carbonate Hardness Calculated SUS 18XXX Organo Chlorines Gas Chromatography SUS 08101 Oxygen-dissolved Winkler SUS 15901 P-particulate Calculated SUS 15465 P-total dissolved Automated Colourimetric SUS 185XX Phenoxy Herbicides Gas Chromatography SUS 15423 Phosphorus-total Colourimetric (TRAACS) SUS 19103 Potassium Flame Emission SUS 11250 Percent Sodium Calculated SUS 011201 SAR Calculated SUS 00210 Saturation Index Calculated SUS 34108 Selenium-dissolved ICAP-hydride SUS 14108 Silica Automated Colourimetric SUS 11103 Sodium Flame Emission SUS 00211 Stability Index Calculated SUS 16306 Sulphate Automated Colourimetric SUS 00201 TDS Calculated SUS 02061 Temperature Digital Thermometer SUS 02073 Turbidity Nephelometry SUS 23002 Vanadium- total AA-Solvent Extraction SUS 30005 Zinc- total AA-Solvent ExU-action SUS 10301 pH ElecU-ometric SUS 92111 Uranium Fluometric SUS * - Computer Storage and Retrieval System - Environment Canada AA - Atomic Absorption UV - Ultraviolet NFR - Nonfilterable Residue ICAP - Inductively Coupled Argon Plasma. SUS - Suspended A2-12 Responsible Agency: Saskatchewan Environment Data Collected by: SaskPower ESQUADAT* Code Parameter Analytical method Sampling Frequency Station No. 2 3 4 5 6 10151 Alkali nily-phenol Pot-Titration DIS Q DIS DIS OF 10101 Alkalinity-lo( Pot-Titration DIS Q DIS DIS OF 13004 Aluminum-tot AA-Direct DIS A DIS DIS 33004 Arsenic-tot Rameless AA DIS A DIS DIS 06201 Bicarbo nates Calculated DIS Q DIS DIS OF 05451 Boron-tot ICAP DIS Q DIS DIS W 48002 Cadmium-tot AA-Solvent Extract (MIBK) DIS A DIS DIS 20103 Calcium AA-Direct DIS Q DIS DIS OF 06052 Carbon-tot Inorganic Infrared DIS Q DIS DIS OF 06005 Carbon-tot Organic Infrared DIS Q DIS DIS OF 06301 Carbonates Calculated DIS Q DIS DIS OF 17203 Chloride Automated Colourimetric DIS Q DIS DIS OF 06711 Chlorophyll- a' Spectrophotometry DIS Q DIS DIS 24004 Chromium-tot AA-Direct DIS A DIS DIS 36012 Co!iform-fec Membrane filtration DIS Q DIS DIS OF 36002 Coliform-tot Membrane filtration DIS Q DIS DIS OF 02041 Conductivity Conductivity Meter DIS Q DIS DIS W 29005 Copper-tot AA-Solvent Extract (MIBK) DIS A DIS DIS 09105 Fluoride Specific Ion Electrode DIS A DIS DIS 82002 Lead-tot AA-Solvent Extract (MIBK) DIS A DIS DIS 12102 Magnesium AA-Direct DIS Q DIS DIS OF 80011 Mercury-tot Rameless-AA DIS A DIS DIS 42102 Molybdenum AA-Solvent Extract (N-Butyl acetate) DIS A DIS DIS 07015 N-TKN Automated Colourimetric DIS Q DIS DIS OF 10401 NFR Gravimetric DIS Q DIS DIS OF 10501 NFR(F) Gravimetric DIS Q DIS DIS OF 28002 Nickel-tot AA-Solvent Extract (MIBK) DIS Q DIS DIS OF 07110 Nitfate -i- NOj Automated Colourimefric DIS Q DIS DIS OF 06521 Oil and Grease Pet. Ether Extraction DIS A DIS DIS 08102 Oxygen-diss Meter DIS Q DIS DIS OF 15406 Phosphorus-tot Colour! metry DIS Q DIS DIS OF 19103 Potassium Flame Photometry DIS Q DIS DIS OF 34005 Selenium-Exl Hydride generation DIS A DIS DIS 11103 Sodium Flame Photometry DIS Q DIS DIS OF 16306 Sulphate Colour! me try DIS Q DIS DIS OF 10451 TDS Gravimetric DIS Q DIS DIS OF 02061 Temperature Thermometer DIS Q DIS DIS OF 23004 Vanadium-tot AA-Direct DIS A DIS DIS 30005 Zinc-tot AA-Solvent Extfact (MIBK) DIS A DIS DIS 10301 pH Elecu-omefric DIS Q DIS DIS w II * Computer storage and retrieval system - Saskatchewan Environment. Syinbois: W - Weekly during overflow; OF- Once during each period of overflow greater than 2 weeks' duration; O - Quarterly; A - Annually; AA - Atomic Absorption; Pot - Potentlometrk;; tot - total; Pet - Petroleum; fee - fecal; diss - dissolved; EXT - extract; NFR - Nonfilterable residue; NFR(F) - Nonfilterable residue, fixed; ICAP - Inductively Coupled Argon Plasma; (MIBK) - sample acidified and extracted with Methyl Isobutyl Ketone; DIS - Discontinued. A2-13 GROUND-WATER PffiZOMETERS TO MONITOR POTENTIAL DRAWDOWN DUE TO COAL-SEAM DEWATERING NEAR THE INTERNATIONAL BOUNDARY Responsible Agency: Saskatchewan Watershed Authority* Measurement Frequency: Quarterly Piezometer Number Location Tip of Screen Elevation (m) Perforation Zone (depth in metres) 52 507 NW 14-1-27 W3 SW 6-1-26 W3 738.43 725.27 43-49 (in coal) 34 - 35 (in coal) Data Collected by: SaskPower A2-14 0 5 10 15 KILOMETERS I ' r-J h GROUND-WATER PIEZOMETERS TO MONITOR POTENTIAL DRAWDOWN DUE TO COAL-SEAM DEWATERING AZ' / Q < _l Q. O Q. m z o I- < u o _J U o Z o o LU (J LU __ Q O O < I SO < 1^ >z 1 S ol-a.z±(rJi !^2 S^g A2-21 Ambient Air-Quality Monitoring Responsible Agency: Saskatchewan Environment Data Collected by: SaskPower No. On Map Location Parameters Reporting Frequency 1 Coronach (Discontinued) Sulphur Dioxide Continuous monitoring with hourly averages as summary statistics. Total Suspended Particulate - 24-hour samples on 6-day cycle, corresponding to the national air pollution surveillance sampling schedule. 2 International Boundary Sulphur Dioxide Continuous monitoring with hourly averages as summary statistics. Total Suspended Particulate 24-hour samples on 6-day cycle, corresponding to the national air pollution surveillance sampling schedule. 3 Poplar River Power Station Wind Speed and Direction Continuous monitoring with hourly averages as summary statistics METHODS 1! Sulphur Dioxide Saskatchewan Environment Pulsed fluorescence Total Suspended Particulate Saskatchewan Environment 11 High Volume Method A2-22 \ .. , N^K X- Rockglen • * ^~\^r/ \ \ c \ X!^ ^\__^ Coronacm 1 ^^^"^'^-x!^^^/^ % ^^\^" [ CANADA \- ./7>L^. .!mL.. L UNITED STATES \\ Scobey 0 5 10 1 ' ' 15 KILOMETERS ) ; 0 5 I'o MILES 1 1^ AMBIENT AIR-QUALITY MONITORING (CANADA) A2-23 POPLAR RIVER COOPERATIVE MONITORING ARRANGEMENT TECHNICAL MONITORING SCHEDULES 2006 UNITED STATES A2-ay STREAMFLOW MONITORING Responsible Agency: U.S. Geological Survey No. on Map Station Number Station Name 1* 06178000 (11AE008) Poplar River at International Boundary 2* 06178500 (11 AE003) East Poplar River at International Boundary * International Gauging Station A2-26 0 5 10 15 KILOMETERS I 1 r-" ^ HYDROMETRIC GAUGING STATIONS (UNITED STATES) A2-27 SURFACE-WATER-QUALITY MONITORING -- Station Locations Responsible Agency: U.S. Geological Survey | No. On Map USGS Station No. STATION NAME 1 06178000 Poplar River at International Boundary 2 06178500 East Poplar River at International Boundary PARAMETERS Annual Sampling Frequency Analytical Code Parameter Analytical Method Site r Site 2" 29801 Alkalinity - lab Fixed endpoint Titration 4 4 00625 Ammonia +Org N-tol Colorimetric 4 4 00608 Ammonia - diss Colon metric 4 4 01000 Arsenic - diss ICP, MS 4 4 01002 Arsenic - tot AA.GF 4 4 01005 Barium - diss ICP, MS 4 4 01007 Barium - total ICP, MS 4 4 00025 Barometric pressure Barometer, field 4 4 01020 Boron - diss ICP 4 4 01025 Cadmium - diss ICP, MS 4 4 01027 Cadmium - tot/rec ICP, MS 4 4 00915 Calcium - diss ICP 4 4 00940 Chloride - diss IC 4 4 01030 Chromium - diss AA,GF 4 4 01034 Chromium - tot/rec AA,GF 4 4 00095 Conductivity Wheatslone Bridge 4 4 01040 Copper - diss ICP, MS 4 4 01042 Copper - tot/rec ICP, MS 4 4 00061 Discharge - inst Direct measurement 4 4 00950 Ruoride - diss ISE 4 4 01046 Iron - diss ICP 4 4 01045 Iron - tot/rec ICP 4 4 01049 Lead - diss ICP 4 4 01051 Lead - tot/rec ICP, MS 4 4 00925 Magnesium - diss ICP 4 4 01056 Manganese - diss ICP, MS 4 4 01055 Manganese - tot/rec ICP, MS 4 4 01065 Nickel - diss ICP, MS 4 4 71900 Mercury - diss CVAF 4 4 71890 Mercury - tot/rec CVAF 4 4 01067 Nickel - diss ICP, MS 4 4 00613 Nitrite - diss Colorimetric 4 4 00631 Nitrate + Nitrite - diss Colorimetric 4 4 00300 Oxygen-diss Oxygen membrane, field 4 4 00400 pH Electrometric, field 4 4 00671 Phos. Ortho-diss Colorimetric 4 4 00665 Phosphorous - tot Colorimetric 4 4 00935 Potassium - diss AA 4 4 00931 SAR Calculated 4 4 80154 Sediment - cone. Filtration-Gravimetric 4 4 80155 Sediment - load Calculated 4 4 01145 Selenium - diss ICP, MS 4 4 01147 Selenium tot ICP, MS 4 4 00955 Silica - diss Colorimetric 4 4 00930 Sodium - diss ICP 4 4 00945 Sulphate - diss IC 4 4 70301 Total Dissolved Solids Calculated 4 4 00010 Temp Water Stem Thermometer 4 4 00020 Temp Air Stem Thermometer 4 4 01090 Zinc - diss ICP, MS 4 4 01092 Zinc - tot/rec ICP, MS 4 4 samples collected obtained during the monthly periods: * -- March - April; May; June; July - September ** -- May; June; July; August - September Vbbreviations: AA - atomic absorption; cone. - concentration; CVAF- cold vapor atomic fluorescence; diss -dissolved; GF - graphite furnace; IC - ion exchange chromatography; ICP - inductively coupled plasma; ISE - ion-selective electrode; MS - mass spectrography ; Org - organic; phos. - phosphate; tot - total; tot/rec - total recoverable A2-28 Scobey i SURFACE-WATER-QUALITY MONITORING STATIONS (UNITED STATES) A2-29 GROUND-WATER-QUALITY MONITORING - Station Locations Responsible Agency: Montana Bureau of Mines and Geology | Map Number Well Location Total Depth (m) Casing Diameter (cm) Aquifer Perforation Zone (m) 7 37N47E12BBBB 44.1 10.2 Hart Coal 39-44 16 37N46E3ABAB 25.5 10.2 Fort Union 23-25 24 37N48E5AB 9.6 10.2 Alluvium 9.2-9.6 Parameters | Storet ** Parameter Analytical Method Sampling Frequency Station No. Code 00440 Bicarbonates Electrometric Titration Sample collection is annually for 01020 Boron-diss Emission Plasma, ICP all locations identified above. 00915 Calcium Emission Plasma 00445 Carbonates Electrometric Titration The analytical method descriptions 00940 Chloride Ion Chromatography are those of the Montana Bureau of 00095 Conductivity Wheatstone Bridge Mines and Geology Laboratory where 00950 Fluoride Ion Chromatography the samples are analyzed. 01046 Iron-diss Emission Plasma, ICP 01049 Lead-diss Emission Plasma, ICP 01130 Lithium-diss Emission Plasma, ICP 00925 Magnesium Emission Plasma, ICP 01056 Manganese-diss Emission Plasma, ICP 01060 Molybdenum Emission Plasma, ICP-MS 00630 Nitrate Ion Chromatography 00400 pH Electrometric 00935 Potassium Emission Plasma, ICP 00931 SAR Calculated 01145 Selenium-diss ICP-MS 00955 Silica Emission Plasma, ICP-MS 00930 Sodium Emission Plasma, ICP 01080 Strontium-diss Emission Plasma, ICP 00445 Sulphate Ion Chromatography 00190 Zinc-diss Emission Plasma, ICP 70301 TDS Calculated SYMBOLS: ** - Computer storage and retrieval system - EPA cm - centimetres diss - dissolved ICP - Inductively Coupled Plasma Unit ICP - MS - Inductively Coupled Plasma - Mass Spectrometry m - metre A2-30 CANADA UNITED STATES 0 5 10 15 KILOMETERS I ' — H h GROUND-WATER-QUALITY MONITORING (UNITED STATES) A2-31 GROUND-WATER LEVELS TO MONITOR POTENTIAL DRAWDOWN DUE TO COALSEAM DEWATERING Responsible Agency: Montana Bureau of Mines and Geology | No. on Map Sampling 5,6,7,8,9,10,11,13,16,17,19,22,23,24 Determine water levels quarterly A2-32 GROUND-WATER PIEZOMETERS TO MONITOR POTENTIAL DRAWDOWN DUE TO COAL-SEAM DEWATERING A2-33 ANNEX 3 RECOMMENDED FLOW APPORTIONMENT IN THE POPLAR RIVER BASIN BY THE INTERNATIONAL SOURIS-RED RIVERS ENGINEERING BOARD, POPLAR RIVER TASK FORCE (1976) A3-1 ♦RECOMMENDED FLOW APPORTIONMENT IN THE POPLAR RIVER BASIN The aggregate natural flow of all streams and tributaries in the Poplar River Basin crossing the International Boundary shall be divided equally between Canada and the United States subject to the following conditions: 1. The total natural flow of the West Fork Poplar River and all its tributaries crossing the International Boundary shall be divided equally between Canada and the United States ^' but the flow at the International Boundary in each tributary shall not be depleted by I more than 60 percent of its natural flow. t 2. The total natural flow of all remaining streams and tributaries in the Poplar River I Basin crossing the International Boundary shall be divided equally between Canada ^; and the United States. Specific conditions of this division are as follows: * (a) Canada shall deliver to the United States a minimum of 60 percent of the I natural flow of the Middle Fork Poplar River at the International Boundary, as ' ] determined below the confluence of Goose Creek and Middle Fork. (b) The delivery of water from Canada to the United States on the East Poplar River shall be determined on or about the first day of June of each year as follows: (i) When the total natural flow of the Middle Fork Poplar River, as determined below the confluence of Goose Creek, during the immediately preceding March 1st to May 31st period does not exceed 4,690 cubic decameters (3,800 acre-feet), then a continuous minimum flow of 0.028 cubic metres per second (1.0 cubic foot per second) shall be delivered to the United States on the East Poplar River at the International Boundary throughout the succeeding 12 month period commencing June 1st. In addition, a volume of 370 cubic decameters (300 acre-feet) shall be delivered to the United States upon demand at any time during the 12 month period commencing June 1st. (ii) When the total natural flow of the Middle Fork Poplar River, as determined below the confluence of Goose Creek, during the immediately preceding March 1st to May 31st period is greater than 4,690 cubic decameters (3,800 acre-feet), but does not exceed 9,250 cubic decameters (7,500 acre-feet), * Canada-United States, 1976, Joint studies for flow apportionment. Poplar River Basin, Montana-Saskatchewan: Main Report, International Souris-Red Rivers Board, Poplar River Task Force, 43 pp. A3-3 then a continuous minimum flow of 0.057 cubic metres per second (2.0 cubic feet per second) shall be delivered to the United States on the East Poplar River at the International Boundary during the succeeding period June 1st through August 31st. A minimum delivery of 0.028 cubic metres per second (1.0 cubic feet per second) shall then be maintained from September 1st through to May 31st of the following year. In addition, a volume of 617 cubic decameters (500 acre-feet) shall be delivered to the United States upon demand at any time during the 12-month period commencing June 1st. (iii) When the total natural flow of the Middle Fork Poplar River, as determined below the confluence of Goose Creek, during the immediately preceding March 1st to May 31st period is greater than 9,250 cubic decameters (7,500 acre-feet), but does not exceed 14,800 cubic decameters (12,000 acre-feet), then a continuous minimum flow of 0.085 cubic metres per second (3.0 cubic feet per second) shall be delivered to the United States on the East Poplar River at the International Boundary during the succeeding period June 1st through August 31st. A minimum delivery of 0.057 cubic metres per second (2.0 cubic feet per second) shall then be maintained from September 1st through to May 31st of the following year. In addition, a volume of 617 cubic decameters (500 acre-feet) shall be delivered to the United States upon demand at any time during the 12 month period commencing June 1st. (iv) When the total natural flow of the Middle Fork Poplar, as determined below the confluence of Goose Creek, during the immediately preceding March 1st to May 31st period exceeds 14,800 cubic decameters (12,000 acre-feet) then a continuous minimum flow of 0.085 cubic metres per second (3.0 cubic feet per second) shall be delivered to the United States on the East Poplar River at the International Boundary during the succeeding period June 1st through August 31st. A minimum delivery of 0.057 cubic metres per second (2.0 cubic feet per second) shall then be maintained from September 1st through to May 31st of the following year. In addition, a volume of 1,230 cubic decameters (1,000 acre-feet) shall be delivered to the United States upon demand at any time during the 12- month period commencing June 1st. (c) The natural flow at the International Boundary in each of the remaining individual tributaries shall not be depleted by more than 60 percent of its natural flow. A3-4 3. The natural flow and division periods for apportionment purposes shall be determined, unless otherwise specified, for periods of time commensurate with the uses and requirements of both countries. A3-5 ANNEX 4 CONVERSION FACTORS A4-1 CONVERSION FACTORS ac = 4,047 m^ = 0.04047 ha ac-ft = 1,233.5 m^= 1.2335 dam^ °C = 5/9(°F-32) cm = 0.3937 in. cm^ = 0.155 in^ dam^ = 1,000 m^ = 0.8107 ac-ft ft^ = 28.3171 X lOW ha = 10,000 m^ = 2.471 ac hm = 100 m = 328.08 ft hm' = 1 X 10* m^ I. gpm = 0.0758 I7s in = 2.54 cm kg = 2.20462 lb = 1.1 X 10'^ tons km = 0.62137 miles km' = 0.3861 mi^ L = 0.3532 ft^ = 0.21997 I. gal = 0.26420 U.S. gal Us = 0.035 cfs = 13.193 I. gpm= 15.848 U.S. gpm m = 3.2808 ft m' = 10.765 ft^ m' = 1,000 L = 35.3144 ft' = 219.97 1. gal= 264.2 U.S. gal mVs = 35.314 cfs mm = 0.00328 ft tonne = 1,000 kg =1.1023 ton (short) U.S. gpm = 0.063117s For Air Sai mples ppm = 100 pphm = 1000 x (Molecular Weight of substance/24.45) mg/m A4-3 STATF nnrnMFNTS COLLECTION FEB 2 0 2007 MONTANA SIAIE LISRARY 1515 F.. 6th AVE. HELENA. MONTANA 59620