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Home My WebLink About20080868 Ver 2_Bonnerton Summary Memo 2020 Update_20210928WETLAND HYDROLOGY IN THE BONNERTON ROAD NON-RIVERINE WET HARDWOOD FOREST - 2020 UPDATE BEAUFORT COUNTY, NORTH CAROLINA Prepared for: PCS Phosphate Company, Inc. Prepared by: CZR Incorporated 4709 College Acres Drive, Suite 2 Wilmington, NC 28403 September 2021 TABLE OF CONTENTS 1.0 Introduction 5 1.1 Area Description 5 2.0 Methodology 5 2.1 Water Level 5 2.2 Rainfall and Drought 6 2.3 PCS Deep Well Pump Operations and Water Levels in CZR Level TROLLs 7 3.0 Results and Discussion 7 3.1 Soil Series and Soil Profiles 7 3.2 Rainfall and Drought in 2015 - 2020 7 3.3 Wetland Hydrology by Year 9 3.4 Mine Perimeter Deep Well Pump Operation and Near Surface Hydrology 10 4.0 Summary 11 5.0 Literature Cited 12 Cover Photo: view looking southwest towards BHW 11, 22 September 2020 Bonnerton NRWHF Wetland Hydrology ii PCS Phosphate Company, Inc. 2020 Update September 2021 LIST OF FIGURES Figure 1 401 Water Quality Certification Conditions 9 and 13 Wetland Hydrology Monitoring F-1 Figure 2 Non-riverine Wet Hardwood Forest Areas (135A and 58A) avoided by Mod Alt L F-2 Figure 3 Bonnerton NRWHF Hydrology Monitoring Wells F-3 Figure 4 Bonnerton NRWHF Wells and Soil Series F-4 Figure 5 2020 Porter Creek and WETS -Aurora 6N Rainfall F-5 Figure 6 2019 Porter Creek and WETS -Aurora 6N Rainfall F-6 Figure 7 2018 Porter Creek and WETS -Aurora 6N Rainfall F-7 Figure 8 2017 Porter Creek and WETS -Aurora 6N Rainfall F-8 Figure 9 2016 Porter Creek and WETS -Aurora 6N Rainfall F-9 Figure 10 2015 Porter Creek and WETS Aurora 6N Rainfall F-10 Figure 11 Bonnerton NRWHF Hydrology Monitoring Sites and Deep Well Locations F-11 Figure 12 2015 — 2020 Hydrology during Deep Well Pump Operations F-12 LIST OF TABLES Table 1 Monthly and annual rainfall for 2015-2020 recorded at the Porter Creek rain gauge and at the PCS Aurora 6N station T-1 Table 2 Drought conditions for the south side of Pamlico River in the vicinity of South Creek for the years 2012-2020 T-1 Table 3a Hydroperiods for monitoring wells in and near Bonnerton NRWHF areas and upper Porter Creek during WETS normal and below normal rainfall in 2020 T-2 Table 3b Hydroperiods for monitoring wells in and near Bonnerton NRWHF areas and upper Porter Creek independent of WETS thresholds in 2020 T-3 Table 4a Summary of hydroperiods for monitoring wells in and near Bonnerton NRWHF areas and upper Porter Creek during WETS normal or below normal rainfall from 2015-2020 .... T-4 Table 4b Summary of hydroperiods for monitoring wells in and near Bonnerton NRWHF areas and upper Porter Creek independent of WETS thresholds from 2015-2020 T-5 Bonnerton NRWHF Wetland Hydrology iii PCS Phosphate Company, Inc. 2020 Update September 2021 LIST OF APPENDICES Appendix A Soil Profile Descriptions at Bonnerton NRWHF and Upper Porter Creek Monitoring Wells Appendix B 2015-2019 Wetland Hydroperiods for Bonnerton NRWHF and Upper Porter Creek Monitoring Wells Appendix C 2020 Hydrology Graphs of Bonnerton Level TROLLS Bonnerton NRWHF Wetland Hydrology iv PCS Phosphate Company, Inc. 2020 Update September 2021 1.0 Introduction Per Conditions 9 and 13 of the modified 401 Water Quality Certification issued in January 2009 for the PCS Phosphate mine continuation near Aurora NC (DWQ #2008-0868, version 2.0), wetland hydrology of the portions of the Bonnerton Road non-riverine wet hardwood forest (NRWHF) shown as "135A" and "58A" on Figure 1 shall be monitored before and after the mine moves through the area between the avoided NRWHF areas and within the permitted mine boundary (Figure 2). The data collected are to ensure that the wetland hydrology of the two NRWHF areas avoided by the permitted mine boundary is maintained after mine impacts are completed and/or the mined -through area has been reclaimed. 1.1 Area Description The Bonnerton Road NRWHF is located on a peninsula between Durham Creek to the west and Porter Creek to the east; both creeks flow north to the nearby Pamlico River (Figure 1). Surface water flow of the peninsula into the two creeks is separated by the divide known as the Suffolk Scarp, a geomorphic feature whose highest elevation in this vicinity is just to the west of the 135A NRWHF (Figure 1). Slope of the terrain on the most eastern side of the scarp towards Porter Creek is —0.2 percent, while the slope approaches 1 percent nearer to the eastern toe of the Suffolk Scarp. Similar to other outer coastal plain interfluves in North Carolina, where the underlying Castle Hayne limestone is close to the surface, the forested landscape of the peninsula is gently rolling with occasional small closed depressions and small non-hydric areas of higher elevation. 2.0 Methodology 2.1 Water Level To monitor the pre -mine hydrology of the monitored area, a total of 14 semi -continuous electronic Level TROLL 500 data -logger water level monitoring wells, manufactured by In -Situ, were installed in June and July 2015 at the locations shown in Figure 3 (BHW1-BHW14). In addition to the 14 wells installed in 2015, there are six additional wells used to monitor the wetland hydrology adjacent to upper Porter Creek for a separate project (locations shown on Figure 3). Two other types of monitoring wells have been used at four of these locations (PCW1, PCW3, PCW4, and PCW6) since 2006 [Remote Data Systems (RDS) WL20s and WL80s and RDS Ecotone 20s and Ecotone 80s] but Level TROLL 500s have been in place at all six locations since 2015 (wells at PCW2 and PCW5 were added). Each of the 14 Level TROLLs is housed inside a 2-inch diameter PVC well screen (0.010-inch slots) installed to a depth of approximately 32 inches and backfilled with filter sand. The recorder is suspended on a 43.75-inch cable in the well screen to record water levels within at least -20 inches below the ground surface and up to +20 inches above the surface. Among the 14 wells the range of water levels which can be recorded below the surface ranges from -24.25 to -31.75 inches and the range of surface water which can be recorded ranges from +18.0 to +26.0 inches. The units record the water level every 1.5 hours (16 times per day). The six upper Porter Creek wells are housed inside a 3-inch diameter PVC well screen with 0.010-inch slots, but the Level TROLL cable is 60.25 inches long and among these wells, the range for below ground water level is -29.75 to -33.25 inches, and the range of surface water is +32.75 to +36.5 5 inches. (The longer cable is used for the upper Porter Creek wells as part of a different monitoring project methodology and protocol). To prevent damage by bears, the above -ground portions of all well screens were surrounded by a fence enclosure made of metal T-posts and strands of barbed wire. All 20 monitoring wells were checked and downloaded once a month. Most of the 14 wells are located in portions of the hardwood flat at slightly higher elevations than the six Porter Creek wells; however, no elevations have been surveyed so perceived differences in elevation are not quantified. Wetland hydroperiods were calculated for each monitoring well during the growing season. A hydroperiod is defined as consecutive days during the growing season that the water table is within 12 inches of the surface or the surface is inundated, and is expressed as a percentage of the growing season. For this project, the growing season is defined by the Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Atlantic and Gulf Coastal Plain Region (Version 2.0) (USACE ERDC 2010) to match the Natural Resources Conservation Services' (NRCS) WETs tables and is 282 days long in non -leap years (28 February-6 December). For the purposes of this report, a hydroperiod for 6 percent or more of the growing season is considered a wetland hydroperiod. 2.2 Rainfall and Drought Rainfall was collected and measured using a RDS tipping bucket style rain gauge until 2019 when it became obsolete; it was replaced with a Texas Electronic TR-525USW style bucket with similar function and accuracy (+/- 1% at 0-2 inches/hour). Rainfall lands in the funnel of the rain gauge and is directed down to the bottom of the funnel where it drips into two carefully calibrated "buckets" balanced on a pivot. Once the bucket has reached its calibrated amount, 0.010 inch of rain, it tips down registering the event as the opposite bucket rises to begin collecting the next calibrated amount of rain. Water is allowed to drain out of a hole on either side of the rain gauge underneath each bucket. The Porter Creek rain gauge was used for local rainfall data (Figure 3) except during any data gap or malfunction, when gaps were replaced with data from the nearby DCUT19 (3.3 miles to the northwest) or Aurora Station 6N station (4.7 miles to the east). Long-term rainfall collected at the NOAA station PCS Aurora 6N was used by the Natural Resources Conservation Service (NRCS) to provide what is known as the WETS Aurora Station 6N rainfall data. These data were downloaded by CZR Incorporated (CZR) and used to build annual rainfall figures to determine periods of normal rainfall. "Range of Normal" refers to the 30th and 70th percentile thresholds of the probability of onsite rainfall amounts outside of the normal range (based on historical averages from 1971-2000). In December of 2016, the long-term historical averages were updated by NRCS to include 1981-2010. Drought conditions are monitored nationally by several indexes. Periods of drought can affect the hydrology of a site and should be taken into consideration when wetland hydrology is interpreted. As suggested in the USACE 2010 Regional Supplement, the Palmer Drought Severity Index (PDSI) was used to determine drought periods for the area. The PDSI is useful because it "takes into account not only precipitation but also temperature, which affects evapotranspiration, and soil moisture conditions" (US Army Corps of Engineers 2010). The PDSI is calculated monthly and is based on major climatic divisions within each state (US Army Corps of Engineers 2010). Although the index is not site -specific, for the 6 purposes of this report it provided sufficient information to make general statements about drought conditions in the area. Drought conditions described by this index by month and year are for the NOAA Central Coastal Plain region of North Carolina. The US Drought Monitor website (http://droughtmonitor.unl.edu) provides a synthesis of multiple indices and impacts and reflects the consensus of federal and academic scientists on regional conditions on a weekly basis (updated each Thursday). The area used for regional drought conditions includes numerous watersheds of various sizes and may cover portions of more than one county. 2.3 PCS Deep Well Pump Operations and Water Levels in CZR Level TROLLs In previous reports a dynamic multiple linear regression model was used to compare water depth to rainfall, wind speed, wind direction, and discharge across three different time periods: pre, during, and post deep well pump operation. No adverse trends on hydroperiods were detected or attributed to the deep well pump operation during past evaluations; however the same test was not repeated for this report because the influence of estuarine wind -driven water and/or discharge from the Pamlico River is not expected at the Bonnerton wells since they are well above riparian areas. When discharge and wind parameters were removed from the evaluation, the remaining data sets (water level and rainfall) both violated the statistical assumption of normality (were not normally distributed) despite attempts to normalize. In addition, the statistical power of the non -parametric tests was very low, which is likely because there were many positive and negative water level readings, as well as many absent water level readings (greater than approximately 30 inches below the surface, which is the lower range of well detection). To aid in evaluation of potential effects of deep well pumps on Bonnerton wells, hydrology graphs of the Bonnerton wells are depicted along with each deep well pump operations (on/off dates) (Figure 12). 3.0 Results and Discussion 3.1 Soil Series and Soil Profiles The soil survey for Beaufort County NC (Kirby 1995) and web soil survey data show the area of the Bonnerton NRHWF as underlain mostly by Tomotley fine sandy loam and several other soil series which are all considered hydric; two of the soil series are considered non-hydric (Altavista fine sandy loam and Augusta fine sandy loam) (Figure 4). Since earlier well installation soil profiles were described by several biologists at different times, in 2016/2017, soil profiles at all 20 well locations were re -described using the NRCS hydric soil indicators (USDA 2010) as directed by the 2010 regional supplement (soil profiles included in Appendix A). 3.2 Rainfall and Drought in 2015 - 2020 Monthly rainfall totals recorded in 2015-2020 at the Porter Creek rain gauge and at the PCS Aurora 6N station are shown in Table 1. In 2020, monthly rainfall totals below the 30th percentile in January; within 30-70th percentiles in February, April, June, September, and October; and above the 70th percentile in March, May, July, August, November, and December (Figure 5). Annual 2020 rainfall total at the Porter Creek rain gauge was 73.21 7 inches. Porter rain gauge monthly totals were highest for the year in November while the PCS Aurora 6N rain gauge recorded its highest monthly total in August. Days of above normal rainfall (6 February through 9 March, 21 May through 27 June, 28 July through 28 August, and 12 November through 12 December) were excluded from hydroperiod calculations to compare with hydroperiods using all rainfall data. In 2019, monthly rainfall totals for January, February, April, June, July, and November through December were below the WETS 70th percentile (Figure 5); annual rainfall total at the Porter Creek rain gauge was 56.67 inches. Porter rain gauge monthly totals were highest for the year in August associated with heavy downpours while the PCS Aurora 6N rain gauge recorded its highest monthly total mostly due to Tropical Storm Dorian on September 6th. Days of above normal rainfall (13 April through 9 May, 12 July through 20 July, 24 July through 11 August, and 28 August through 27 September) were excluded from hydroperiod calculations to compare with hydroperiods using all rainfall data. In 2018, monthly rainfall totals for January, February, and March were below the WETS 70th percentile (Figure 6); the majority of the year was above the WETS normal range and annual rainfall total at the Porter Creek gauge was 67.61 inches. The wettest tropical cyclone on record in the Carolinas, Hurricane Florence (slow moving Category 1 storm), made landfall in Wrightsville Beach, NC on 14 September. Rainfall throughout Beaufort County was generally 4 to 8 inches with a storm rainfall total of 6.95 inches in Belhaven. The heaviest rainfall totals fell across the extreme southern part of the county which caused flash flooding in some locations. In 2017, monthly rainfall totals for January, February, October, and November were below the WETS 30th percentile (Figure 7); annual rainfall total at the Porter Creek gauge was 48.09 inches. April was the only month with total rainfall above the WETS normal range. A strong coastal low pressure system produced heavy rainfall and flash flooding from 23 April to 25 April. Based on the 30-day rolling total, rainfall from 24 April through 24 May was considered above normal. In 2016, monthly rainfall was greater in February, June, July, September and October when compared to the WETS percentiles (Figure 8); annual total rainfall at the Porter Creek gauge was 55.93 inches. Rainfall for March and mid to late August were below normal with the remainder of the year within WETS normal range. Hurricane Matthew, a Category 1 storm, made landfall in Cape Romain National Wildlife Refuge, SC on 8 October 2016. Above average rainfall spikes began in the PCS area on 7 October, coincident with arrival of the outer rain bands of the hurricane in North Carolina. There were several periods of above normal rainfall that were excluded when hydroperiods were calculated for normal and below normal rainfall: 3 February through 5 March, 3 June through 5 July, 7-30 July, 11-30 September, and 7 October through 7 November. In 2015, monthly rainfall was greater in June, October, and late November through late December when compared to the WETS percentiles (Figure 9); annual total rainfall at the Porter Creek gauge was 58.96 inches. At the end of January and March, the 30-day rolling total was slightly above normal. Rainfall for the month of August was below normal and the rainfall for the remainder of the year fell within the WETS normal range. Periods of above normal rainfall included 3 June through 3 July, 2 October through 1 November, and 20 November through 20 December. 8 For 2020, the US Drought Monitor (http://droughtmonitor.unl.edu) indicated three weeks were considered abnormally dry (DO); the remaining weeks had no drought status in the vicinity of the Bonnerton Road NRHWF "135A" and "58A" project areas (Table 2). In 2019, nine weeks were considered abnormally dry (DO) the highest record since 2015; the remaining weeks had no drought status in the vicinity of the Bonnerton Road NRHWF "135A" and "58A" project areas (Table 2; four years prior to 2015 are also shown). In 2018, one week was considered abnormally dry (DO). In 2017, five weeks were considered abnormally dry (DO). During 2016, three weeks in April were assigned drought condition (D0 — Abnormally Dry) or 6 percent of the entire year and 7 percent of the 41-week growing season (Table 3). In 2015, all 41 weeks of the growing season were considered normal with no drought status. 3.3 Wetland Hydrology by Year 2020 For 2020, 18 wells recorded wetland hydroperiods for 12.5 to 25.0 percent of the growing season and two wells increased in hydrologic zones to record wetland hydroperiods for 25.0 to 75.0 percent of the growing season when periods of above normal rainfall were excluded (Table 3a). During all rainfall conditions four wells had hydroperiods for >25.0-75.0 percent of the growing season while all the other wells remained in the >12.5-25.0 percent range (Table 3b). Under all rainfall conditions, two wells changed from the >12.5-25.0 percent hydrologic zone to the >25.0-75.0 percent from 2019 to 2020. 2019 For 2019, all locations recorded wetland hydroperiods for 12.5 to 25.0 percent of the growing season when periods of above normal rainfall were excluded (Table 3a). During all rainfall conditions two wells had hydroperiods for >25.0-75.0 percent of the growing season while all the other wells remained in the >12.5-25.0 percent range (Table 3b). Under all rainfall conditions, four wells changed from the >25.0-75.0 percent hydrologic zone to the >12.5-25.0 percent from 2018 to 2019. 2018 All BHW and PCW wells well locations recorded wetland hydroperiods in 2018, even when periods of above normal were excluded (Tables 3a and 3b). Of the 14 BHW wells, eight wells had hydroperiods for >12.5-25.0 percent and six wells had hydroperiods for >25-75 percent of the growing season during all rainfall conditions. Similarly, all six PCW wells had hydroperiods for >12.5-25.0 percent. When hydroperiods that occurred during above normal rainfall were removed (Figure 5), six wells decreased from >25.0-75.0 percent to >12.5-25.0 percent of the growing season; all other wells maintained hydroperiods for >12.5-25.0 percent of the growing season. 2017 All well locations recorded wetland hydroperiods, even when periods of above normal were excluded (Tables B-la and lb, Appendix B). Of the 14 BHW wells, eight wells had hydroperiods for >12.5-25.0 percent and six wells had hydroperiods for >25-75 percent of the growing season during all rainfall conditions. Similarly, all six PCW wells had hydroperiods for >12.5-25.0 percent. 9 When hydroperiods that occurred during above normal rainfall were removed, six wells decreased from >25.0-75.0 percent to >12.5-25.0 percent of the growing season; all other wells maintained hydroperiods for >12.5-25.0 percent of the growing season. 2016 The first full monitoring year for the 14 BHW wells was 2016. All well locations recorded wetland hydroperiods during the 2016 growing season (Tables B-la and lb, Appendix B). Of the 14 BHW wells, hydroperiods for eight wells were >12.5-25.0 percent and six wells were >25.0-75.0 percent of the growing season. Similarly, all six PCW wells had hydroperiods for >12.5-25.0 percent. When above normal rainfall was removed (Figure 6), only one well (PCW1) decreased from >12.5-25.0 percent to >_6.0-12.5 percent of the growing season during normal and below normal rainfall conditions. 2015 The 14 Bonnerton wells (BHW) were installed at the end of June 2015 and beginning of July 2015; the six upper Porter Creek (PCW) wells collected data all year. All 14 BHW wells exhibited wetland hydroperiods using all rainfall data between June and December and the six Porter Creek wells exhibited wetland hydroperiods between February and December (Tables B-la and lb, Appendix B). Among the 14 wells in the higher elevations of the hardwood flat, BHW6 had the longest hydroperiod of 23.8 percent of the growing season while longest hydroperiods at the remaining wells were in the range of >_6.0 - 12.5 percent of the growing season (Table 4b). The six wells in upper Porter Creek are located in somewhat lower elevations than some of the other 14 wells and using all 2015 rainfall data, longest hydroperiods were >12.5-25.0 percent of the growing season with PCW6 exhibiting the longest hydroperiod of 24.5 percent (Appendix B). When dates with above normal rainfall during 2015 (Figure 7) were removed and only normal and below normal rainfall periods are used for evaluation, three BHW wells did not exhibit any wetland hydroperiods between June and December (one of these four exhibited water within 12 inches of the surface but for less than 6 percent of the growing season), nine had longest hydroperiods in the range of >_6.0- 12.5 percent, and longest hydroperiod at one well was >12.5-25.0 percent (Table 4a). All six PCW wells had wetland hydroperiods in the range of >12.5-25.0 percent of the growing season during normal and below normal rainfall. 3.4 Mine Perimeter Deep Well Pump Operation and Near Surface Hydrology At agency request, PCS provided CZR information about the locations and dates of operation (turn -ON and turn -OFF dates) of pumps in deep wells around the Bonnerton Mod Alt L mine perimeter for analysis of potential effects on adjacent wetland hydrology attributed to the pump activity. Deep wells within an approximate half mile of the Bonnerton shallow wells and the months of pump activity in 2020 include: deep wells east of Bonnerton 1108 (Jan -Aug), 1109 (off), 1110 (off), 1111 (Aug -Dec); deep wells northwestern of Bonnerton 1125 (Mar -Dec), 1124 (Mar -Dec); and deep wells southwest of Bonnerton 1126 (Apr -Dec), 1127 (May -Dec), 1128 (Mar -Dec). As in previous years, deep well pump activity does not appear to affect water levels or hydroperiods at the wetland shallow monitoring wells (Figure 12). Water 10 levels at Bonnerton respond to rainfall events and seasonal patterns (winter wet and lower levels after spring leaf -out and during the summer) much like those in other wetlands throughout the area. 4.0 Summary During 2015-2020 monitoring years, all 20 ground water monitoring wells exhibited wetland hydroperiods when all rainfall data are used to tabulate consecutive number of days of water levels above -12.0 inches (relative to ground surface) as shown in Table 4a. The 14 Bonnerton wells were not installed until June of 2015; after the period when longest hydroperiods are typically recorded. For years with complete data 2016-2020, all BHW and PCW wells exhibited wetland hydroperiods (greater than 12 percent), even when periods of above normal rainfall was excluded (Table 4a). As in most past years the four wells with the longest hydroperiods (under both scenarios; all rainfall and with wetter periods removed) were BHW4, BHW5, BHW6, and BHW11. When considering all rainfall data, during a record year at Porter, two well hydroperiods from the site exceeded 45 percent for the first time; BHW5 was 71.7 percent and BHW7 was 62.5 percent. While the amount of annual rainfall, the months in which more or less rainfall occurs, and the percent of weeks with drought status varies from year to year, the wetland hydroperiods in the Bonnerton non- riverine wet hardwood forest over the five years appears to be relatively similar (Table 4b) and the operation of nearby deep well pump activity does not appear to have affected the hydroperiods. 11 5.0 Literature Cited Kirby, Robert M. 1995. Soil Survey of Beaufort County, North Carolina. Natural Resources Conservation Service, United States Department of Agriculture. Soil Survey Staff. Undated. Natural Resources Conservation Service, United States Department of Agriculture. Web Soil Survey. Available online at http://websoilsurvey.nrcs.usda.gov/. Accessed [09/10/2012]. US Army Corps of Engineers. 2010. Regional supplement to the Corps of Engineers wetland delineation manual: Atlantic and Gulf coastal plain region. Version 2. J.S Wakeley, R.W. Lichvar, and C.V. Noble, eds. ERDC/EL TR-10-20, Vicksburg, MS. US Department of Agriculture, Natural Resources Conservation Service. 2010. Field Indicators of Hydric Soils in the United States, Version 7.0. L.M. Vasilas, G.W. Hurt, and C.V Noble (eds.) USDA, NRCS, in cooperation with the National Technical Committee for Hydric Soils. Zeileis, A (2016) dynlm: Dynamic Linear Regression. R package version 0.3-5. URL http://CRAN.R- project.org/package=dynlm 12 LEGEND W% 2.100 NON-RIVERINE WET HARDWOOD FOREST AREAS 135A AND 58A 0 2.100 Feet 401 Water Quality Certification Conditions 9 and 13 Wetland Hydrology Monitoring PCS PHOSPHATE MINE CONTINUATION Scale: As shown Date: 08/05/21 Approved by: Drawn b : TLJ File: 174579/BONNERTON NRWHF 2020/ BONRTN_NRWHF_TOPO_2020RPT Figure 1 F-1 SOURCE: AERIALS PROVIDED BY: PCS PHOSPHATE COMPANY, INC. 1530 NC HIGHWAY 306 SOUTH, AURORA. NORTH CAROUNA 27006, 252-322-5121, DATE: FEBRUARY B, 2021 1,000 0 1,000 Feet LEGEND MODIFIED ALT L PERMIT BOUNDARY NON—RIVERINE WET HARDWOOD FOREST AREAS 135A AND 58A AVOIDED BY PERMITTED MOD ALT L MINE BOUNDARY Bonnerton Non—Riverine Wet Hardwood Forest Areas Avoided by Mod Alt L PCS PHOSPHATE MINE CONTINUATION Scale: As shown Date: 08/05/21 Approved by: Drawn by: TLJ File: 1/4/9/dUNNLNIUN NKWHP MUN zuzu/ BONRTN_ORWHFAERAL_202ORPT Figure 2 F-2 SOURCE: AERIALS PROVIDED BY: PCS PHOSPHATE COMPANY, INC. 1530 NC HICHWAY 306 SOUTH, AURORA, NORTH CAROLINA 27806, 252-322-5121, DATE: FEBRUARY 8, 2021 1,200 0 1,200 Feet LEGEND MODIFIED ALT L PERMIT BOUNDARY NON—RIVERINE WET HARDWOOD FOREST AREAS 135A AND 58A AVOIDED BY PERMITTED MOD ALT L MINE BOUNDARY SEMI -CONTINUOUS MONITORING WELL RAIN GAUGE Bonnerton NRWHF Hydrology Monitoring Sites PCS PHOSPHATE MINE CONTINUATION Scale: As shown Date: 08/05/21 Drawn by: TLJ File: 174579/130MNERTON NRWI-IF MON 2020/ EINTRN_NRWHF_MON_202ORRT F-3 Approved by: Figure 3 SOURCE: AERIALS PROVIDED BY: PCS PHOSPHATE COMPANY, INC. 1530 NC HIGHWAY 306 SOUTH, AURORA, NORTH CAROLINA 27806, 252-322-5121, DATE: FEBRUARY 8, 2021 SOIL SURVEY OF BEAUFORT COUNTY, NORTH CAROLINA, US DEPARTMENT OF AGRICULTURE NATURAL RESOURCES CONVERSATION SERVICE, ISSUED: SEPTEMBER 1995 1,000 0 1,000 Feat LEGEN❑ SOILS SYMBOL MODIFIED ALT L PERMIT BOUNDARY NON—RIVERINE WET HARDWOOD FOREST AREAS 135A AND 58A AVOIDED BY PERMITTED MOD ALT L MINE BOUNDARY SOIL NAME AaA At Ct le Lo Me Pe Pt Ro Sb To B To W ALTAVISTA FINE SANDY LOAM AUGUSTA FINE SANDY LOAM CAPE FEAR FINE SANDY LOAM LEAF SILT LOAM LEON SAND MUCKALEE LOAM PERQUIMANS SILT LOAM PORTSMOUTH LOAM ROANOKE EINE SANDY LOAM SEABROOK LOAMY SAND TARBORO SAND TOMOTLEY FINE SANDY LOAM WATER BONNERTON NRWHF SOILS PCS PHOSPHATE MINE CONTINUATION Scale: As shown Date: 08/05/21 Approved by: Drawn b : TLJ B: 174579/60NNER1oN rem -IF MON 2020/ ©ONTRN_NRWI ir_SOIL5-2020RPT Figure 4 F-4 16 . NOTES: "Range of Normal" and "Aurora Monthly Rainfall Total" plotted on last day of each month. "Range of Normal" refers to the 30th and 70th percentile thresholds of the probability of onsite rainfall amounts outside of the normal range (based on historical averages from 1981-2010). WETS Data 14 • subject to periodic revision. Data shown are latest available from http://agacis.rcc-acis.org/?fips=37013 "Aurora Monthly Rainfall Total" refers to monthly totals from the PCS-Aurora 6 N NOAA Station. 0 1/ do Qy<e�d o �at 2020 Porter Daily Rainfall 2020 WETS 30-yr 30% less chance Porter 30-day Rolling Total • 2020Aurora Monthly Rainfall Total 2020 WETS 30-yr 30% more chance 7 2020 Porter Monthly Rainfall Figure 5. 2020 Porter rainfall vs. WETS -Aurora rainfall. Above normal rainfall: 2/6-3/9; 5/21-6/27; 7/28-8/28; 11/12-12/12. F-5 16 - 14 - al 12 42 10 a 8 0 2 6 ro -03 0 4 NOTES: "Range of Normal" and "Aurora Monthly Rainfall Total" plotted on last day of each month. "Range of Normal" refers to the 30th and 70th percentile thresholds of the probability of onsite rainfall amounts outside of the normal range (based on historical averages from 1981-2010). WETS Data subject to periodic revision. Data shown are latest available from http://agacis.rcc-acis.org/?fips=37013 "Aurora Monthly Rainfall Total" refers to monthly totals from the PCS-Aurora 6 N NOAA Station. 0 1 I 1 j u LJ ?id 1 I,. it 1 1 1 r II I .4''' py� py� oP o `� o, o, aP 2019 Porter Daily Rainfall 2019 WETS 30-yr 30% less chance ail rtJI . cfr or= Porter 30-day Rolling Total • 2019 Aurora Monthly Rainfall Total 2019 WETS 30-yr 30% more chance 2019 Porter Monthly Rainfall Figure 6. 2019 Porter rainfall vs. WETS -Aurora rainfall. Above normal rainfall: 4/13-5/9; 7/12-7/20; 7/24-8/11; 8/28-9/27. F-6 16 14 4 2 0 cb any ciS? NOTES: "Range of Normal" and "Aurora Monthly Rainfall Total" plotted on last day of each month. "Range of Normal" refers to the 30th and 70th percentile thresholds of the probability of onsite rainfall amounts outside of the normal range (based on historical averages from 1981-2010). WETS Data subject to periodic revision. Data shown are latest available from http://agacis.rcc-acis.org/?fips=37013 "Aurora Monthly Rainfall Total" refers to monthlytotals from the PCS-Aurora 6 N NOAA Station. _ I Y • i ell - ,I I li I _ IL likit li, J. ... .. . I [ LJI L . A� n� key \I' Phi' �aa 2018 Porter Daily Rainfall —2018 WETS 30-yr 30% less chance Cb o2 Porter 30-day Rolling Total • 2018 Aurora Monthly Rainfall Total —2018 WETS 30-yr 30% more chance 2018 Porter Monthly Rainfall Figure 7. 2018 Porter rainfall vs. WETS -Aurora rainfall. Above normal rainfall: 4/15-5/16, 5/19-7/17, 7/28-8/23, 9/14-10/14, 11/5- 12/5. F-7 Daily and Monthly Rainfall (inches) 12 10 - 6 4 0 sc NOTES: "Range of Normal" and "Aurora Monthly Rainfall Total" plotted on last day of each month. "Range of Normal" refers to the 30th and 70th percentile thresholds of the probability of onsite rainfall amounts outside of the normal range (based on historical averages from 1981-2010). WETS Data subject to periodic revision. Data shown are latest available from http://agacisfcc- acis.org/?fips=37013 "Aurora Monthly Rainfall Total" refers to monthly totals from the PCS-Aurora 6 N NOAA Station. i J • • I r [1 1 I 1 1 ,J AI] i. IL0J ._ '1 A Y� a� aJ �'� �� J� oJ, oti oti� otiP oti� Ns). oti otiP o o oti� 2017 Porter Daily Rainfall —�2017 WETS 30-yr 30% less chance .' —Porter 30-day Rolling Total • 2017 Aurora Monthly Rainfall Total —�2017 WETS 30-yr 30% more chance 2017 Porter Monthly Rainfall Figure 8. 2017 Porter rainfall vs. WETS -Aurora rainfall. Above normal rainfall: 4/26-5/23. F-8 Daily and Monthly Rainfall 14 12 - 10 8 6 NOTES: Durham Creek DCUT19 rainfall data was used in place of Porter Creek rainfall data on 1 January through 15 September 2016 due to equipment malfunctions. "Range of Normal" and "Aurora Monthly Rainfall Total" plotted on last day of each month. "Range of Normal" refers to the 30th and 70th percentile thresholds of the probability of onsite rainfall amounts outside of the normal range (based on historical averages from 1981-2010). WETS Data subject to periodic revision. Data shown are latest available from http://agacis.rcc- acis.orga?fi ps=37013 "Aurora Monthly Rainfall Total" refers to monthly totals from the PCS-Aurora 6 N NOAAStation. • I � r ijil r J .- 4i ,I I Ilk Al i.. 1111 J rl I J� I� 1� II 1 I i Lr � i I .. . N , N• Nco r - yea 'yf, 'y(° 'yr° N, 'y�O fat' P�Sa'\ ,�� ,,, se9 0(' boa �G of Qti ,0> Oti oti oti oi o)> oti oti 2016 Porter Daily Rainfall -2016 WETS 30-yr 30% less chance Porter 30-day Rolling Total • 2016Aurora Monthly Rainfall Total -Monthly Rainfall Total 2016 Porter Monthly Rainfall Figure 9. 2016 Porter Rainfall and WETS -Aurora Rainfall. Above normal rainfall: 2/3-3/5; 6/3-7/5; 7/7-7/30; 9/11-9/30; 10/7-11/7. F-9 16 14 - 12 - 4v c - 10 co ce t ▪ 8 0 2 co ›- 6 NOTES: PCSAurora rainfall data was used in place of Porter Creek rainfall data on 11Julythrough 14 October 2015 and 10 November through 31 December 2015 due to equipment malfunctions. "Range of Normal" and "Aurora Monthly Rainfall Total" plotted on last day of each month. "Range of Normal" refers to the 30th and 70th percentile thresholds of the probability of onsite rainfall amounts outside of the normal range {based on historical averages from 1971-2004 WETS Data subject to periodic revision. Data shown are latest available from http://www.wcc.nres.usda.gov/climate/navigate_wets.htm "Aurora Monthly Rainfall Total" refers to monthly totals from the PCS-Aurora 6 N NOAAStation. 0 J L I �I _�I ii, 1 I �ti ..� h `' ti`' yh N ac ``��a HPit �� a a� o�' oti oti 2015 Porter Daily Rainfall 2015 WETS 30-yr 30% less chance ILL L 111,, • LeA tih � yh ¢Otis ��ti5 �': oti oti a�� a'% a� V' aCI .,I - Porter 30-day Rolling Total • 2015 Au rora Monthly Rainfall Total - Monthly Rainfall Total 2015 Porter Monthly Rainfall Figure 10. 2015 Porter Rainfall and WETS -Aurora Rainfall. Above normal rainfall: 6/3-7/3; 10/2-11/1; 11/20-12/20. F-10 SOURCE: AFRIAI S PROVIDFD BY: PCS PHOSPHATE COMPANY, INC. 1530 NC HIGHWAY 306 SOUTH, AURORA, NORTH CAROLINA 27806, 252-322-5121, DATE: FEBRUARY 8, 2021 LEGEND MODIFIED ALT L PERMIT BOUNDARY NON-RIVERINE WET HARDWOOD FOREST AREAS 135A AND 58A AVOIDED BY PERMITTED MOD ALT L MINE BOUNDARY SEMI -CONTINUOUS MONITORING SHALLOW WELL RAIN GAUGE DEEP WELL (STILL ON AT THE END OF 2020) DEEP WELL (OFF AT THE END OF 2020) 1,200 0 1,200 Feet Bonnerton NRWHF Hydrology Monitoring Sites and Deep Well Locations PCS PHOSPHATE MINE CONTINUATION Scale: As shown Date: 08/10/21 Drawn by: TLJ File: 174079/BONNERTON NRMIF MON 2020/ BNTRN_NRWHF_MON_DEEPWELL_2020RPT Approved by: Figure 11 F-11 Water Depth (inches) i3 o 8 o '• o D W 1108 - DW1109 BHWlwas installed 25June 2015 DW1110 DW1111 DW1112 DW1113 DW1114 DW1115 DW1116 DW1117 - DW1118 DW1119 D W 1120 DW1121 DW1122 DW1123 D W 1124 D W 1125 DW1126 DW1127 1 41 4111 DW1128 40 BHW1 2015 2016 2017 2018 2019 2020 Year Water Depth (inches) 3 c, 8 o • 0 D W 1108 - DW1109 BHW3was installed 25June2015 DW1110 - DW1111 DW1112 DW1113 DW1114 DW1115 DW1116 DW1117 DW1118 - DW1119 D W 1120 DW1121 DW1122 DW1123 DW1124DW1125 DW1126 L 111 y 1 i I 1"1 DW1127 DW1128 BHW3 40 2015 2016 2017 2018 2019 2020 Year Water Depth (inches) 8 23 2. o 8 o '• o E. D W 1108 - DW1109 BHW2was installed 25June 2015 DW1110 - DW1111 DW1112 DW1113 DW1114 DW1115 DW1116 DW1117 DW1118 DW1119 D W 1120 DW1121 DW1122 DW1123 DW1124DW1125 DW1126 DW1127 I DW1128 E M BHW2 40 2015 2016 2017 2018 2019 2020 Year Water Depth (inches) 50 40 30 20 10 -10 -20 _30 40 D W 1109 BHW4was installed 18June2015 DW1110 D W 1108 DW1111 DW1112 DW1113 DW1114 DW1115 DW1116 DW1117 DW1118 LJ DW1119 D W 1120 DW1121 W1122 DW1123 DW1124DW1125 DW112C DW1127 DW1128 BHW4 2015 2016 2017 Year 2018 2019 2020 Figure 12. 2015 — 2020 hydrology during deep well pump operations. Fourteen Level TROLLs were in proximity to the deep wells during the time the pump was in operation; horizontal bars at top right of graphs depict the period of pump operation. F-12 Water Depth (inches) 4 23 0 E $ - DW1109 DW1108 - BHW5wasinstalled 30June2015 DW1110 - DW1111 DW1112 DW1113 DW1114 DW1115 DW1116 DW1117 _ DW1118 DW1119 DW1120 DW1121 DW1122 _ DWl DW1124 DW1125 DW1126 DW1127 .4__ 441k\ \ ilLQn 1`,44 \ DW1128 _0, _ BHW5 40 2015 2016 2017 2018 2019 2020 Water Depth (inches) 50 40 30 20 10 -10 -20 40 BHW7was installed 1JuIy2015 DW1109 DW1110 DW1111 Y DW1108 DW1112 DW1113 DW1114 DW1115 DW1116 DW1117 DW1118 2015 2016 2017 DW1119 DW1120 DW1126 W1122 DWl DW1124 DW1125 DW1126 DW1127 DW1128 2018 2019 BHW7 2020 Water Depth (inches) 3 i9 P3 DW1108 - DW1109 BHW6was installed lJuly2015 DW1110 DW1111 DW1112 DW1113 DW1114 D W 111 DW1116 DW1117 - DW1118 DW1119 - DW1121 DW1120 DW1122 DW1123 DW1124 DW1125 DW1126 DW1127 eL1/44.'*1"Vt1 Vijekt'4)t 1 1\ iNk"An DW1128 Y� 4 \161°14/ 1) BHW6 lif'k tirLik 4,1 2015 2016 2017 2018 2019 2020 Water Depth (inches) 50 40 30 20 10 -10 -30 40 BHW8was installed 1JuIy2015 DW1109 DW1110 DW1111 DW1108 DW1112 DW1113 DW1114 71` DW1115 2015 2016 2017 DW1116 DW1117 DW1118 k\ DW1119 DW1120 DW1121 DW1122 DW1123 DW1124 DW1125 DW1126 DW1127 DW1128 BHW8 2018 2019 2020 Figure 12 (continued). 2015 — 2020 hydrology during deep well pump operations. Fourteen Level TROLLs were in proximity to the deep wells during the time the pump was in operation; horizontal bars at top right of graphs depict the period of pump operation. F-13 Water Depth (inches) 3 i9 P3 0 0 E. D W 1108 DW1109 BHW9was installed 30June 2015 DW1110 - DWllll DW1112 DW1113 DW1114 DW1115 DW1116 DW1117 - DW1118 DW1119 D W 1120 DW1121 DW1122 DW1123 DW1124 DW1125 DW1126 DW1127 litikki h 4141&1 1°1 i ti, DW1128 n i , , BHW9 2015 2016 2017 2018 2019 2020 Water Depth (inches) 50 — 40 — 30 — 20 - 10 — 0 40 BHW11was installed 18June 2015 D W 1109 DW1110 DW1111 DW 1108 DW1112 DW1113 DW1114 DW1115 DW1116 DW1117 DW1118 1 I DW1119 D W 1120 DW1126W1122 DW160 1124 DW1125 DW1126 DW1127 DW1128 11 BHW11 2015 2016 2017 2018 2019 2020 Water Depth (inches) 3 i9 P3 0 D W 1108 — DW1109 BHW10was installed 30June 2015 DW1110 - DW1111 DW1112 DW1113 DW1114 DW1115 DW1116 DW1117 - DW1118 DW1119 D W 1120 DW1121 DW1122 - D W W1124 DW1125 DW1126 DW1127 ill 41,4\ , 11 Ok4'\ DW1128 ‘4011 i 1 ( \ii,, - BHW10 2015 2016 2017 2018 2019 2020 Water Depth (inches) D W 1109 BHW12was installed 30June 2015 DW1110 D W 1108 50 — DW1111 40 — 30 — 20 10 0 -10 — 40 4\iNt,) 2015 2016 DW1112 DW1113 DW1114 DW1115 DW1116 DW1117 DW1118 L DW1119 D W 1120 D W 1121122 DW1123 DW1124 DW1125 DW1126 DW1127 DW1128 'hiyi 11 1 BHW1 2 2017 2018 2019 2020 Figure 12 (continued). 2015 — 2020 hydrology during deep well pump operations. Fourteen Level TROLLs were in proximity to the deep wells during the time the pump was in operation; horizontal bars at top right of graphs depict the period of pump operation. F-14 Water Depth (inches) 3 i9 o E 0 D W 1108 DW1109 BHW13was installed 30June 2015 DW1110 DW1111 DW1112 DW1113 DW1114 DW1115 DW1116 DW1117 DW1118 D W 1119 D W 1120 DW1121 D W 1122 - DWl DW1124 D W 1125 DW1126 DW1127 lit i' li f 'NliA " 1014640 DW1128 hi) 1'1! i I �I ,,,. BHW13 2015 2016 2017 2018 2019 2020 Water Depth (inches) D W 1109 BHW14was installed 18June 2015 DW1110 50 DW1111 DW1112 DW1113 DW1114 DW1115 40 DW1116 DW1117 DW1118 30 20 0 40 2015 2016 2017 D W 1119 D W 1120 DW1126 W1122 DW1DW1124 D W 1125 DW1126 DW1127 DW1128 2018 2019 2020 Figure 12 (concluded). 2015 — 2020 hydrology during deep well pump operations. Fourteen Level TROLLs were in proximity to the deep wells during the time the pump was in operation; horizontal bars at top right of graphs depict the period of pump operation. F-15 Table 1. Monthly and annual rainfall for 2020, 2019, 2018, 2017, 2016, and 2015 recorded at the Porter Creek rain gauge and at the PCS Aurora 6N station. MONTH 2O20 RAINFALL(INCHES) 2019 RAINFALL(INCHES) 2018 RAINFALL (INCHES) 2017 RAINFALL(INCHES) 2016 RAINFALL(INCHES) 2015 RAINFALL (INCHES) Porter Creek PCS Aurora 6N Porter Creek PCS Aurora 6N Porter Creek PCS Aurora 6N Porter Creek PCS Aurora 6N Porter Creek PCS Aurora 6N Porter Creek PCS Aurora 6N January 2.07 1.63 3.56 4.13 4.55 4.82 3.96 2.68 2.93 3.77 3.95 4.29 February 7.55 7.27 3.93 4.06 1.36 0.96 1.35 1.33 5.83 6.80 4.43 4.88 March 4.62 3.55 2.88 2.17 4.92 5.06 4.71 3.90 3.20 4.39 3.46 3.53 April 3.48 2.01 5.24 5.21 5.82 5.41 5.45 4.72 1.79 2.29 2.50 2.92 May 7.09 7.94 2.02 1.58 8.75 6.62 4.82 3.56 3.58 5.15 4.39 4.32 June 6.13 4.66 4.60 1.94 8.17 6.92 3.62 3.80 6.22 5.43 8.86 8.44 July 9.22 7.26 7.04 1.10 7.59 5.59 5.56 5.81 6.63 5.73 5.65 5.57 August 5.55 8.67 13.82 3.28 4.59 3.96 5.93 6.47 3.79 4.00 2.74 2.74 September 8.29 5.45 4.80 10.63 8.11 7.30 5.24 3.77 8.27 9.49 6.61 6.61 October 2.71 2.49 2.64 2.88 1.84 2.41 2.82 1.23 9.20 8.11 5.70 5.96 November 9.87 7.96 3.28 3.30 4.83 6.20 1.43 1.42 0.99 1.05 5.63 8.72 December 6.63 3.97 2.86 2.01 7.08 6.78 4.01 2.52 3.50 3.71 5.04 5.04 TOTAL 73.21 62.86 56.67 42.29 67.61 62.03 48.09 41.21 55.93 59.92 58.96 63.02 Table 2. Drought conditions for the south side of Pamlico River in the vicinity of South Creek for the years 2012-2020. The drought conditions for each week were provided by the US Drought Monitor. Year No drought status Abnormally dry (DO) Moderately dry (Dl) Severe drought (D2) Extreme drought (D3) Exceptional drought (D4) Percent of weeks with a drought classification 2012 28 I 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 46 2013 39 0 25 2014 45 0 13 2015 52 0 0 2016 49 0 6 2017 47 0 10 2018 51 0 2 2019 43 0 17 2020 48 0 6 Bonnerton NRWHF Wetland Hydrology 2020 Update T-1 PCS Phosphate Company, Inc. September 2021 Table 3a. Hydroperiods for monitoring wells in and near Bonnerton NRWHF areas and upper Porter Creek during WETS normal and below normal rainfall (excludes above normal rainfall from 6 February - 9 March, 12 May - 27 June, 28 July - 28 August, 12 November - 12 December) in 2020. Rainfall from NOAA station Aurora 6N used for long-term percentiles and to determine periods of normal rainfall. Hydroperiods of 14 consecutive days or more are listed by dates, and any hydroperiods shorter than 14 days are included in the cumulative days. Well Days where water table is -12" or above 1-27 Feb Cumulative days where water table is -12" or above 28 Feb 6 Dec Consecutive days where water table is - 12,, or above 28 Feb-6 Dec Dates Percent of longest hydroperiod of 283-day growing season Hydrologic zone <6.0 >6.0-12.5% >12.5-25.0% >25.0-75.0% BHW1 21 51 44 3/10-4/22 15.6 X BHW2 21 59 46 3/10-4/24 16.3 X BHW3 21 63 47 3/10-4/25 3/10-4/25 16.6 16.6 X X B H W4 21 62 47 BHW5 27 173 65; 30; 75 3/10-5/13; 6/28-7/27; 8/29-11/11 3/10-5/11; 9/8-10/21; 10/25-11/11 26.5 22.3 X X BHW6 27 155 63; 44; 18 BHW7 _ 27 171 63; 30; 75 3/10-5/11; 6/28-7/27; 8/29-11/11 _ 26.5 X BHW8 27 125 49; 38; 16 3/10-4/27; 9/8-10/15; 10/25-11/9 17.3 X BHW9 _ 27 135 50; 40; 18 3/10-4/28; 9/8-10/17; 10/25-11/11 _ 17.7 X BHW10 21 111 49; 22; 18 3/10-4/27; 9/18-10/9; 10/28-11/11 17.3 X BHW11 _ 27 153 64; 43; 18 3/10-5/12; 9/8-10/20; 10/25-11/11 _ 22.6 X BHW12 21 103 48; 20 3/10-4/26; 9/18-10/7 17.0 X BHW13 _ 21 101 49; 21 3/10-4/27; 9/18-10/8 _ 17.3 X BHW14 27 87 48; 19 3/10-4/26; 9/18-10/6 17.0 X PCW1 _ 21 44 40 3/10-4/18 _ 14.1 X PCW2 21 52 46 3/10-4/24 16.3 X PCW3 _ 21 47 44 3/10-4/22 _ 15.6 X PCW4 21 68 48 3/10-4/26 17.0 , X X X , PCW5 PCW6 21 21 76 71 49 48 3/10-4/27 3/10-4/26 17.3 17.3 , Bonnerton NRWHF Wetland Hydrology T-2 2020 Update PCS Phosphate Company, Inc. September 2021 Table 3b. Hydroperiods for monitoring wells in and near Bonnerton NRWHF areas and upper Porter Creek independent of WETS thresholds in 2020. Rainfall from NOAA station Aurora 6N used for long-term percentiles and to determine periods of normal rainfall. Hydroperiods of 14 consecutive days or more are listed by dates, and any hydroperiods shorter than 14 days are included in the cumulative days. Well Days where water table is -12" or above 1-27 Feb Cumulative days where water table is -12" or above 28 Feb-6 Dec Consecutive days where water table is -12" or above 28 Feb-6 Dec Dates Percent of longest hydroperiod of 283-day growing season Hydrologic zone <6.0 >6.0-12.5% >12.5-25.0% >25.0-75.0% BHW1 21 125 55; 15; 14 2/28-4/22; 5/20-6/3; 6/13-6/26 19.4 X BHW2 21 145 57; 15; 15 2/28-4/24; 5/20-6/3; 6/13-6/27 20.1 X BHW3 ..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 21 150 58; 16; 15; 25 2/284/25; 5/19-6/3; 6/13-6/27; 11/12-12/6 20.5 X BHW4 21 149 58; 16; 15 2/28-4/25; 5/18-6/2; 6/13-6/27 20.5 X BHW5 27 279 76; 203 2/28-5/13; 5/18-12/6 71.7 X BHW6 27 256 74; 22; 28; 33; 44; 43 2/28-5/11; 5/18-6/8; 6/13-7/10; 7/26-8/27; 9/8-10/21; 10/25-12/6 26.2 X BHW7 27 273 74; 22; 177 2/28-5/11; 5/18-6/8; 6/13-12/6 62.5 X BHW8 27 219 60; 18; 16; 28; 38; 16; 26 2/28-4/27; 5/18-4/4; 6/13-6/28; 7/29-8/25; 9/8-10/15; 10/25-11/9; 11/11-12/6 21.2 X BHW9 ..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 27 232 61; 20; 17; 31; 40; 43 2/28-4/28; 5/18-6/6; 6/13-6/29; 7/26-8/25; 9/8-10/17; 10/25-12/6 21.6 X BHW10 21 204 60; 19; 16; 25; 22; 43 2/28-4/27; 5/18-6/5; 6/13-6/28; 7/29-8/22; 9/18-10/9; 10/25-12/6 21.2 X BHW11 27 254 75; 23; 28; 30; 43; 43 2/28-5/12; 5/18-6/9; 6/13-7/10; 7/29-8/27; 9/8-10/20; 10/25-12/6 26.5 X BHW12 21 192 59; 18; 16; 23; 20; 35 2/28-4/26; 5/18-6/4; 6/13-6/28; 7/29-8/20; 9/18-10/7; 11/2-12/6 20.9 X BHW13 21 191 60; 18; 16; 24; 21; 25 2/284/27; 5/18-6/4; 6/13-6/28; 7/29-8/21; 9/18-10/8; 11/12-12/6 21.2 X BHW14 27 174 59; 18; 15; 19; 25 2/284/26; 5/18-6/4; 6/13-6/27; 9/18-10/6; 11/12-12/6 20.9 X PCW1 21 105 51 2/28-4/18 18.0 X PCW2 21 126 57; 25 2/28-4/24; 11/12-12/6 20.1 X PCW3 21 115 55 2/28-4/22 19.4 X PCW4 21 151 59; 17; 15 2/28-4/26; 5/18-6/3; 6/13-6/27 20.9 X PCWS ...............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................:...................................... 21 164 60; 18; 16; 25 2/284/27; 5/18-6/4; 6/13-6/28; 11/12-12/6 21.2 PCW6 21 157 59; 17; 15 2/28-4/26; 5/18-6/3; 6/13-6/27 20.9 X Bonnerton NRWHF Wetland Hydrology 2020 Update T-3 PCS Phosphate Company, Inc. September 2021 Table 4a. Summary of hydroperiods for monitoring wells in and near Bonnerton NRWHF areas and upper Porter Creek during WETS normal or below normal rainfall from 2015 through 2020. Rainfall from NOAA station Aurora 6N used for long-term percentiles and to determine periods of normal rainfall. (WH=wetland hydroperiod). Note: The longest hydroperiod at each well is depicted as a percentage of the 282-day (or 283-day for leap years) growing season when the water table was recorded as -12" or above. Also shown are total annual rainfall in inches and the percentage of weeks with a drought status of D0 classification (abnormally dry) or drier in a year. Well # of Years %ofYears 2015* 2016 2017 2018 2019 2020 with WH with WH for All Years BHW1 BHW2 BHW3 BHW4 BHW5 BHW6 BHW7 BHW8 BHW9 BHW10 BHW11 BHW12 BHW13 BHW14 PC1 PC2 PC3 PC4 PC5 PC6 Porter Creek Annual Rainfall (in.) Drought Weeks (%) 0.0 15.5 17.0 16.0 15.6 15.6 5 83.3 0.0 16.3 18.8 16.3 15.6 16.3 5 83.3 6.0 15.9 17.0 16.3 15.6 16.6 6 100 0.0 15.9 17.0 16.3 15.6 16.6 5 83.3 6.4 28.3 19.5 16.3 15.6 26.5 6 100 6.4 29.0 19.5 16.3 15.6 22.3 6 100 6.4 28.3 19.5 16.3 15.6 26.5 6 100 6.4 15.5 19.5 16.3 15.6 17.3 6 100 5.7 28.3 19.5 16.3 15.6 17.7 5 83.3 25.4 19.5 16.3 15.6 17.3 6 100 29.0 19.5 16.3 15.6 22.6 6 100 16.3 18.8 16.3 15.6 17.0 6 100 18.0 19.5 16.3 15.6 17.3 6 100 18.0 18.4 16.3 15.6 17.0 6 100 23.0 12.4 16.0 16.0 15.6 14.1 6 100 23.0 15.5 16.7 16.3 15.6 16.3 6 100 23.0 14.8 16.3 16.0 15.6 15.6 6 100 23.8 15.5 18.4 16.3 15.6 17.0 6 100 23.8 16.3 18.8 16.3 15.6 17.3 6 100 24.5 15.5 18.8 16.3 15.6 17.3 6 100 6.0 6.4 6.0 6.0 6.0 58.96 55.93 48.09 67.61 56.67 73.21 0 6 10 2 17 6 * Bonnerton wells were installed in June/July 2015; hydroperiods for 2015 may have occurred prior to well installation. Fill colors represent: >6.0-12.5% >12.5 - 25% >25 - 75% of the growng season. Bonnerton NRWHF Wetland Hydrology T-4 PCS Phosphate Company, Inc. 2020 Update September 2021 Table 4b. Summary of hydroperiods for monitoring wells in and near Bonnerton NRWHF areas and upper Porter Creek independent of WETS thresholds from 2015 through 2020. Rainfall from NOAA station Aurora 6N used for long-term percentiles and to determine periods of normal rainfall. (WH=wetland hydroperiod). Note: The longest hydroperiod at each well is depicted as a percentage of the 282-day (or 283-day for leap years) growing season when the water table was recorded as -12" or above. Also shown are total annual rainfall in inches and the percentage of weeks with a drought status of D0 (abnormally dry) or drier in a year. Well BHW1 BHW2 BHW3 BHW4 BHW5 BHW6 BHW7 BHW8 BHW9 BHW10 BHW11 BHW12 BHW13 BHW14 PCW1 PCW2 PCW3 PCW4 PCW5 PCW6 Porter Creek Annual Rainfall (in.) Drought Weeks (%) 2015* 2016 2017 2018 2019 2020 6.1 6.4 12.1 6.4 12.4 18.4 19.1 18.8 18.8 30.7 23.8 31.4 30.7 18.4 30.7 27.9 31.4 19.1 20.8 20.8 23.0 14.8 23.0 18.4 23.0 17.7 23.8 18.4 23.8 19.1 24.5 18.4 12.4 12.4 11.7 12.1 12.4 12.1 12.1 12.1 17.0 18.8 17.0 17.0 28.4 36.5 36.5 28.0 28.0 23.0 28.7 18.8 23.0 18.4 16.0 16.7 16.3 18.4 18.8 18.8 22.0 22.7 22.7 22.3 26.2 44.7 27.7 26.2 26.2 23.0 27.3 22.7 23.4 23.0 21.3 22.3 21.6 22.3 22.3 22.3 20.9 21.3 21.3 21.3 24.8 25.2 24.8 22.7 22.0 22.3 25.2 21.3 22.3 21.6 19.9 20.9 19.9 20.9 21.3 21.3 19.4 20.1 20.5 20.5 71.7 26.2 62.5 21.2 21.6 21.2 26.5 20.9 21.2 20.9 18.0 20.1 19.4 20.9 21.2 20.9 58.96 55.93 48.09 67.61 56.67 73.21 0 6 10 2 17 6 # of Years with WH of Years with WH for All Years 6 100 6 100 6 100 6 100 6 100 6 100 6 100 6 100 6 100 6 100 6 100 6 100 6 100 6 100 6 100 6 100 6 100 6 100 6 100 6 100 * Bonnerton wells were installed in June/July 2015; hydroperiods for 2015 may have occurred prior to well installation. Fill colors represent: >6.0-12.5% >12.5 - 25% 111111.11Mof the growng season. Bonnerton NRWHF Wetland Hydrology T-5 PCS Phosphate Company, Inc. 2020 Update September 2021 APPENDIX A Soil Profile Descriptions at Bonnerton NRWHF and Upper Porter Creek Monitoring Wells Appendix A. Soil profiles at the 20 hydrology monitoring locations within and near the Bonnerton non-riverine wet hardwood forest that drains to upper Porter Creek (58A and 135A polygons). The eight wells shown with an * are located within the 58A polygon; the six wells shown with ** are located within the 135A polygon. Profiles described in December 2016 and March 2017. Well Depth (inches) Matrix Redox Features Texture Remarks Hydrologic Indicators Color % Color % Type° Loc° BHW1* 0 - 6 10 YR 3/2 100 00 00 00 00 00 0 00 00 C.)0 00 0 000 00 00 000 0 0 00 00 0 0 0 0 0 0 Sandy Loam Not Saturated 6 - 14 10 YR 6/1 75 10 YR 6/8 25 M Sandy Loam Not Saturated Depleted Matrix (F3) Depleted Dark Surface (A11) 14 - 28 10 YR 7/1 60 10 YR 6/8 40 M Sandy Clay Loam Not Saturated BHW2* 0 - 7 10 YR 4/1 100 Sandy Loam Not Saturated 7 - 15 10 YR 5/1 80 10 YR 5/8 20 M Sandy Clay Loam Not Saturated Depleted Matrix (F3) 15 - 28 10 YR 5/1 70 10 YR 6/8 30 M Sandy Clay Not Saturated BHW3* 0 - 3 10 YR 3/1 100 Sandy Loam Not Saturated 3 - 22 10 YR 5/1 85 10 YR 5/8 15 M Sandy Loam Not Saturated Depleted Matrix (F3) Depleted Dark Surface (A11) 22 - 28 10 YR 6/1 70 10 YR 6/8 30 M Sandy Clay Loam Not Saturated BHW4* 0 - 6 10 YR 3/2 100 Sandy Loam Not Saturated 6 - 17 10 YR 6/1 95 10 YR 6/8 5 M Sandy Loam Not Saturated Depleted Matrix (F3) Depleted Dark Surface (A11) 17 - 28 10 YR 6/1 65 10 YR 6/8 35 M Sandy Clay Loam Not Saturated PCW3* 0 - 8 10 YR 3/2 100 Sandy Loam Not Saturated 8 - 22 10 YR 5/1 95 10 YR 5/8 5 M Sandy Loam Not Saturated Depleted Matrix (F3) Depleted Dark Surface (A11) 22 - 28 10 YR 5/1 80 10 YR 5/8 20 M Sandy Clay Loam Not Saturated PCW4* 0 - 4 10 YR 3/2 100 Sandy Clay Loam Not Saturated Depleted Matrix (F3) 4 - 30 10 YR 5/1 90 10 YR 5/8 10 M Sandy Clay Loam Not Saturated Depleted Dark Matrix (A11) PCW5* 0-5 10 YR 3/2 100 Sandy Clay Loam Saturated 5-11 10 YR 5/2 90 10 YR 5/6 10 M Sandy Clay Loam Saturated Depleted Matrix (F3) Depleted Dark Surface (A11) 11-14 10 YR 5/2 80 10 YR 5/6 20 M Sandy Clay Loam Saturated PCW6* 0 - 4 10 YR 3/2 100 Sandy Clay Loam Not Saturated Depleted Matrix (F3) 4 - 18 10 YR 5/1 90 10 YR 5/8 10 M Sandy Clay Loam Not Saturated Depleted Dark Surface (A11) 18 - 28 10 YR 5/1 65 10 YR 5/8 35 M Sandy Clay Loam Not Saturated PCW1 0 - 7 10 YR 3/2 100 Sandy Loam Not Saturated 7 - 15 10 YR 4/1 95 10 YR 5/8 5 M Sandy Loam Not Saturated Depleted Matrix (F3) Depleted Dark Surface (A11) 15 - 28 10 YR 5/1 90 10 YR 5/8 10 M Sandy Clay Loam Not Saturated PCW2 0-3 10 YR 3/2 100 Sandy Clay Loam Not Saturated 3-10 10 YR 4/1 90 10 YR 5/8 10 M Sandy Clay Loam Saturated Depleted Matrix (F3) Depleted Dark Surface (A11) 10-30 10 YR 5/1 80 10 YR 5/8 20 M Sandy Clay Loam Saturated BHWS 0 - 5 10 YR 3/1 100 Sandy Loam Not Saturated Depleted Matrix (F3) 5 - 9 10 YR 4/1 100 Sandy Clay Loam Not Saturated 9 - 25 10 YR 5/1 80 10 YR 5/8 20 M Sandy Clay Not Saturated Depleted Dark Surface (A11) BHW6 0 - 3 10 YR 3/1 100 Sandy Loam Not Saturated 3 - 9 10 YR 4/1 95 10 YR 5/8 5 M Sandy Loam Not Saturated Depleted Matrix (F3) 9 - 19 10 YR 5/1 80 10 YR 5/8 20 M Sandy Clay Loam Saturated Depleted Dark Surface (A11) 19 - 28 10 YR 5/1 70 10 YR 5/8 30 M Sandy Clay Loam Saturated BHW7 0 - 8 10 YR 3/2 100 Sandy Loam Not Saturated Depleted Matrix (F3) 8 - 20 10 YR 5/1 90 10 YR 5/8 10 M Sandy Clay Loam Not Saturated Depleted Dark Surface (A11) 20 - 28 10 YR 5/1 90 10 YR 5/8 10 M Sandy Clay Loam Saturated BHW8 0 - 5 10 YR 3/1 100 Sandy Loam Not Saturated Depleted Matrix (F3) 5 - 17 10 YR 4/1 80 10 YR 5/8 20 M Sandy Clay Loam Not Saturated Depleted Dark Surface (A11) 17 - 28 10 YR 4/1 65 10 YR 6/8 35 M Sandy Clay Loam Not Saturated BHW9** 0 - 3 10 YR 3/1 100 Sandy Loam Not Saturated 3 - 12 10 YR 3/1 97 10 YR 6/8 3 M Sandy Clay Loam Not Saturated Depleted Dark Surface (A11) 12 - 22 10 YR 4/1 95 10 YR 6/8 5 M Sandy Clay Loam Not Saturated 22 - 28 10 YR 4/1 80 10 YR 6/8 20 M Sandy Clay Loam Not Saturated BHW10** 0 - 8 10 YR 2/1 100 Sandy Loam Not Saturated 8 - 16 10 YR 3/1 50 10 YR 5/8 10 M Sandy Clay Loam Not Saturated Depleted Matrix (F3) 10 YR 4/1 40 16 - 28 10 YR 5/1 45 10 YR 5/8 30 M Sandy Clay Loam Not Saturated BHW11 ** 0 - 3 10 YR 3/1 100 Sandy Loam Not Saturated 3 - 8 10 YR 3/2 100 Clay Loam Not Saturated Depleted Matrix (F3) 8 - 17 10 YR 4/1 100 Clay Loam Not Saturated 17 - 24 10 YR 4/1 95 10 YR 5/8 5 M Clay Loam Saturated Depleted Dark Surface (A11) 24 - 28 10 YR 5/1 70 10 YR 5/8 30 M Clay Loam Saturated BHW12** 0 - 8 10 YR 2/2 100 Sandy Loam Not Saturated Depleted Matrix (F3) 8 - 14 10 YR 4/1 97 10 YR 4/6 3 M Sandy Clay Loam Not Saturated Depleted Dark Surface (A11) 14 - 28 10 YR 5/1 60 10 YR 6/8 40 M Sandy Clay Loam Saturated BHW13** 0 - 5 10 YR 3/1 100 Sandy Loam Not Saturated 5 - 14 10 YR 5/1 95 10 YR 4/6 5 M Sandy Loam Not Saturated Depleted Matrix (F3) 14 - 20 10 YR 5/1 85 10 YR 5/8 15 M Sandy Loam Not Saturated Depleted Dark Surface (A11) 20 - 28 10 YR 5/1 85 10 YR 5/8 15 M Sandy Loam Saturated BHW14** 0 - 7 10 YR 3/1 95 10 YR 4/6 5 M Sandy Loam Not Saturated 7 - 18 10 YR 5/1 80 10 YR 4/6 20 M Sandy Loam Not Saturated Depleted Matrix (F3) 18 - 28 10 YR 4/1 60 10 YR 6/8 40 M Sandy Clay Loam Not Saturated Depleted Dark Surface (A11) ° - Type: C= Concentration a - Loc: M = Matrix Bonnerton NRWHF Wetland Hydrology 2020 Update A-1 PCS Phosphate Company, Inc. September 2021 APPENDIX B 2015-2019 Wetland Hydroperiods for Bonnerton NRWHF and Upper Porter Creek Monitoring Wells Appendix B-la. 2015-2019 wetland hydroperiods for Bonnerton NRWHF and upper Porter Creek monitoring wells during WETS normal and below normal rainfall. Rainfall from NOAA station Aurora 6N used for long-term percentiles and to determine periods of normal rainfall. 2019 GROWING SEASON We l l Consecutive days WT-12" or above Dates Longest hydroperiod Cumulative days of wetland hydroperiods 282-day growing season Hydrologic zone of longest hydroperiod <6% >_6-12.5% >12.5-25% >25-75% BHW1 ...................... BHW2 BHW3 ...................... BHW4 BHW5 BHW6 BHW7 BHW8 ...................... BHW9 BHW1O ...................... BHW11 BHW12 BHW13 BHW14 PC1 ...................... PC2 PC3 ...................... PC4 ...................... PC5 PC6 44 44 44 44 44 44 44; 21 44 44 44 44 44 44 44 44 44 44 44 44 44 2/28-4/12 2/28-4/12 2/28-4/12 2/28-4/12 2/28-4/12 2/28-4/12 2/28-4/12; 11/16-12/6 2/28-4/12 2/28-4/12 2/28-4/12 2/28-4/12 2/28-4/12 2/28-4/12 2/28-4/12 2/28-4/12 2/28-4/12 2/28-4/12 ........................ 2/28-4/12 ........................ 2/28-4/12 2/28-4/12 44 44 44 44 15.6 15.6 15.6 15.6 44 15.6 44 15.6 67 15.6 50 15.6 ................................................................................. 44 15.6 44 44 15.6 15.6 44 15.6 44 15.6 44 15.6 44 44 44 44 44 44 15.6 15.6 15.6 X X X X X X X X X X X X X X X X X X X X 2018 GROWING SEASON Well Consecutive days WT-12" or above Dates Cumulative days of wetland hydroperiods Longest hydroperiod 282-day growing season Hydrologic zone of longest hydroperiod <6% >_6-12.5% >12.5-25% >25-75% BHW1 45 3/1-4/14 47 16.0 X BHW2 46 2/28-4/14 51 16.3 X BHW3 46 2/28-4/14 51 16.3 X BHW4 46 2/28-4/14 52 16.3 X BHW5 46 2/28-4/14 52 16.3 X BHW6 ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... BHW7 46 46 2/28-4/14 2/28-4/14 60 61 16.3 16.3 X X BHW8 46 2/28-4/14 54 16.3 X BHW9 46 2/28-4/14 52 16.3 X BHW1O 46 2/28-4/14 52 16.3 X BHW11 46 2/28-4/14 54 16.3 X BHW12 46 2/28-4/14 52 16.3 X BHW13 ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... BHW14 46 46 2/28-4/14 2/28-4/14 52 52 16.3 16.3 X X PC1 45 3/1-4/14 49 16.0 X PC2 46 2/28-4/14 52 16.3 X PC3 45 3/1-4/14 50 16.0 X PC4 ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... PC5 46 46 2/28-4/14 2/28-4/14 51 52 16.3 16.3 X X PC6 46 2/28-4/14 52 16.3 X Bonnerton NRWHF Wetland Hydrology 2020 Update B-1 PCS Phosphate, Inc. September 2021 Appendix B-la continued. 2017 GROWING SEASON Well Consecutive days WT-12" or above Dates Cumulative days of wetland hydroperiods Longest hydroperiod % 282-day growing season Hydrologic zone of longest hydroperiod <6% >_6-12.5% >12.5-25% >25-75% BHW1 48 2/28-4/16 50 17.0 X BHW2 53 2/28-4/21 53 18.8 X BHW3 48 2/28-4/16 50 17.0 X BHW4 48 2/28-4/16 51 17.0 X BHW5 55 2/28-4/23 65 19.5 X BHW6 55;17; 28 2/28-4/23; 5/25-6/10; 8/29-9/25 111 19.5 X BHW7 55; 17; 31 2/28-4/23; 5/25-6/10; 8/29-9/28 130 19.5 X BHW8 55; 31 2/28-4/23; 8/29-9/28 102 19.5 X BHW9 55 2/28-4/23 63 19.5 X BHW1O 55 2/28-4/23 56 19.5 X BHW11 55 2/28-4/23 63 19.5 X BHW12 ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... BHW13 53 55 2/28-4/21 2/28-4/23 54 54 18.8 19.5 X X BHW14 52 2/28-4/20 52 18.4 X PC1 ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... PC2 45 47 2/28-4/13 2/28-4/15 46 49 16.0 16.7 X X PC3 46 2/28-4/14 46 16.3 X PC4 ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... PC5 52 53 2/28-4/20 2/28-4/21 52 53 18.4 18.8 X X PC6 53 2/28-4/21 53 18.8 X 2016 GROWING SEASON Well Consecutive days WT-12" or Dates Cumulative days of wetland hydroperiods Longest hydroperiod % 283-day growing Hydrologic zone of longest hydroperiod <6% >_6-12.5% >12.5-25% >25-75% BHW1 44 3/6-4/19 44 15.5 X BHW2 46 3/6-4/21 46 16.3 X BHW3 45 3/6-4/20 45 15.9 X BHW4 45 3/6-4/20 45 15.9 X BHW5 80 3/6-5/24 80 28.3 X BHW6 82 3/6-5/26 82 29.0 X BHW7 80 3/6-5/24 80 28.3 X BHW8 44; 18 3/6-4/19; 5/3-5/20 62 15.5 X BHW9 80 3/6-5/24 80 28.3 X BHW1O 72 3/6-5/16 72 25.4 X BHW11 82 3/6-5/26 82 29.0 X BHW12 46 3/6-4/21 46 16.3 X BHW13 51; 14 3/6-4/26; 5/3-5/16 65 18.0 X BHW14 51 3/6-4/26 51 18.0 X PC1 35 3/6-4/9 35 12.4 X PC2 44 3/6-4/19 44 15.5 X PC3 42 3/6-4/17 42 14.8 X PC4 44 3/6-4/19 44 15.5 X PC5 ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... PC6 46 44 3/6-4/21 3/6-4/19 46 44 16.3 15.5 X X Bonnerton NRWHF Wetland Hydrology 2020 Update B-2 PCS Phosphate, Inc. September 2021 Appendix B-la concluded. 2015 GROWING SEASON (BHW wells not installed until June/July) Well BHW1 BHW2 ...................... BHW3 BHW4 ...................... BHW5 BHW6 BHW7 ...................... BHW8 BHW9 ...................... BHW10 BHW11 ...................... BHW12 BHW13 ...................... BHW14 PC1 ...................... PC2 PC3 ...................... PC4 PC5 ...................... PC6 Consecutive days WT-12" or Dates Cumulative days of Longest hydroperiod wetland hydroperiods % 282-day growing Hydrologic zone of longest hydroperiod <6% >_6-12.5% >12.5-25% >25-75% 0 0 17 0 18 16; 18 18 15; 18 16 17 15; 18 17 17 17 65;17 65;17 65;17 67;15 67;15 69;17 None None 11/3-11/19 None 11/2-11/19 7/12-7/27; 11/2-11/19 11/2-11/19 .................................................................. 7/12-7/26; 11/2-11/19 11/4-11/19 ................................. 11/3-11/19 7/12-7/26; 11/2-11/19 11/3-11/19 11/3-11/19 11/3-11/19 2/28-5/3; 11/3-11/19 ............................................................... 2/28-5/3; 11/3-11/19 2/28-5/3; 11/3-11/19 ............................................................... 2/28-5/5; 11/5-11/19 2/28-5/5; 11/5-11/19 ............................................................... 2/28-5/7; 11/3-11/19 O 0.0 O 0.0 17 6.0 O 0.0 18 6.4 34 6.4 18 6.4 ............................................................................... 33 6.4 16 5.7 17 6.0 33 6.4 ............................................................................... 17 6.0 17 6.0 17 6.0 82 23.0 ................................................................................. 82 23.0 82 23.0 ................................................................................. 80 23.8 80 23.8 ................................................................................. 86 24.5 X X X X X X X Bonnerton NRWHF Wetland Hydrology 2020 Update B-3 PCS Phosphate, Inc. September 2021 Appendix B-1b. 2015-2019 wetland hydroperiods for Bonnerton NRWHF and upper Porter Creek monitoring wells independent of WETS thresholds. Rainfall from NOAA station Aurora 6N used for long-term percentiles and to determine periods of normal rainfall. 2019 GROWING SEASON Well BHW1 BHW2 BHW3 ...................... BHW4 BHW5 BHW6 BHW7 BHW8 BHW9 BHW10 ...................... BHW11 BHW12 BHW13 ...................... BHW14 PC1 PC2 ...................... PC3 PC4 PC5 PC6 Consecutive days WT- 12 or above 59 60 60 .................. 60 70 71 70; 21 64 62 63 .................. 71 60 63 .................. 61 56 59 .................. 56 59 60 60 Dates Cumulative days of wetland hydroperiods 2/28-4/27 59 2/28-4/28 60 2/28-4/28 60 ....................................................................................................................................................... 2/28-4/28 60 2/28-5/8 73 2/28-5/9 78 2/28-5/8; 11/16-12/6 2/28-5/2 2/28-4/30 2/28-5/1 .......................................................... 2/28-5/9 2/28-4/28 2/28-5/1 .......................................................... 2/28-4/29 2/28-4/24 2/28-4/27 .......................................................... 2/28-4/24 2/28-4/27 2/28-4/28 4/28-4/28 2018GROWING SEASON 105 81 62 63 71 60 63 61 56 59 56 59 60 60 Longest hydroperiod % 282-day growing season 20.9 21.3 21.3 ............................................................... 21.3 24.8 25.2 24.8 22.7 22.0 22.3 25.2 ........................ 21.3 22.3 21.6 ........................ 19.9 20.9 ...........................19.9 ........................ 20.9 21.3 21.3 Hydrologic zone of longest hydroperiod <6% >_6-12.5% >12.5-25% >25-75% X X X X X X X X X X X X X Well Consecutive days WT- 12 or above Dates Cumulative days of wetland hydroperiods Longest hydroperiod %282-day growing season Hydrologic zone of longest hydroperiod <6% >_6-12.5% >12.5-25% >25-75% BHW1 62; 20; 24 3/1-5/1; 5/18-6/6; 11/13-12/6 135 22.0 X BHW2 64; 20; 17; 32 2/28-5/2; 5/18-6/6; 7/25-8/10; 11/5-12/6 158 22.7 X BHW3 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 64; 20; 25; 32 2/28-5/2; 5/18-6/6; 7/25-8/18; 11/5-12/6 163 22.7 X BHW4 63; 20; 25; 32 2/28-5/1; 5/18-6/6; 7/24-8/17; 11/5-12/6 158 22.3 X BHW5 74; 27; 14; 31; 18; 32 2/28-5/12; 5/18-6/13; 6/18-7/1; 7/24-8/23; 9/14-10/1; 11/5-12/6 196 26.2 X BHW6 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 126; 34; 20; 35 2/28-7/5; 7/24-8/26; 9/14-10/3; 11/2-12/6 216 44.7 X BHW7 78; 49; 35; 22; 35 2/28-5/16; 5/18-7/5; 7/24-8/27; 9/14-10/5; 11/2-12/6 221 27.7 X BHW8 74; 30; 15; 33; 17; 32 2/28-5/12; 5/18-6/16; 6/18-7/2; 7/24-8/25; 9/14-9/30; 11/5-12/6 202 26.2 X BHW9 74; 23; 31; 16; 32 2/28-5/12; 5/18-6/9; 7/24-8/23; 9/14-9/29; 11/5-12/6 190 26.2 X BHW10 65; 21; 26; 14; 32 2/28-5/3; 5/18-6/7; 7/24-8/18; 9/14-9/27; 11/5-12/6 177 23.0 X BHW11 77; 30; 15; 33; 19; 32 2/28-5/15; 5/18-6/16; 6/18-7/2; 7/24-8/25; 9/14-10/2; 11/5-12/6 208 27.3 X BHW12 64; 21; 25; 32 2/28-5/2; 5/18-6/7; 7/24-8/17; 11/5-12/6 169 22.7 X BHW13 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 66; 23; 30; 14; 32 2/28-5/4; 5/18-6/9; 7/24-8/22; 9/14-9/27; 11/5-12/6 186 23.4 X BHW14 65; 22; 26; 32 2/28-5/3; 5/18-6/8; 7/24-8/18; 11/5-12/6 173 23.0 X PC1 60; 16; 24 3/1-4/29; 7/25-8/9; 11/13-12/6 136 21.3 X PC2 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 63; 20; 18; 32 2/28-5/1; 5/18-6/6;7/24-8/10;11/5-12/6 157 22.3 X PC3 61; 17; 24 3/1-4/30; 7/25-8/10; 11/13-12/6 144 21.6 X PC4 63; 20; 17; 32 2/28-5/1; 5/18-6/6; 7/25-8/10; 11/5-12/6 154 22.3 X PC5 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 63; 20; 18; 32 2/28-5/1; 5/18-6/6; 7/24-8/10; 11/5-12/6 158 22.3 X PC6 63; 20; 18; 32 2/28-5/1; 5/18-6/6; 7/24-8/10; 11/5-12/6 158 22.3 X Bonnerton NRWHF Wetland Hydrology 2020 Update B-4 PCS Phosphate, Inc. September 2021 Appendix B-lb continued. 2017GROW ING SEASON Well Consecutive days Wi- 12" or above Dates Cumulative days of wetland hydroperiods Longest hydroperiod 282-day growl ng season Hydrologic zone of longest hydroperiod <6% >_6-12.5% >12.5-25% >25-75% BHW1 48 2/28-4/16 60 17.0 X BHW2 53 2/28-4/21 69 18.8 X BHW3 48 2/28-4/16 65 17.0 X BHW4 48 2/28-4/16 67 17.0 X BHWS 80 2/28-5/18 96 28.4 X BHW6 103; 28 2/28-6/10; 8/29-9/25 145 36.5 X BHW7 103; 31 2/28-6/10; 8/29-9/28 164 36.5 X BHW8 79; 31 2/28-5/17; 8/29-928 133 28.0 X BHW9 79 2/28-5/17 93 28.0 X BHW10 65 2/28-5/3 83 23.0 X BHW11 81 2/28-5/19 96 28.7 X BHW12 53 2/28-4/21 75 18.8 X BHW13 65 2/28-5/3 79 23.0 X BHW14 52 2/28-4/20 73 18.4 X PC1 45 2/28-4/13 51 16.0 X PC2 47 2/28-4/15 57 16.7 X PC3 46 2/28-4/14 53 16.3 X PC4 52 2/28-4/20 67 18.4 X PC5 53 2/28-4/21 69 18.8 X PC6 53 2/28-4/21 69 18.8 X 2016 GROWING SEASON Well Consecutive days Wr- 12" or above Dates Cumulative days of wetland hydroperiods Longest hydroperiod % 283-day growing Hydrologic zone of longest hydroperiod <6% >_6-12.5% >12.5-25% >25-75% BHW1 52 2/28-4/19 52 18.4 X BHW2 54 2/28-4/21 54 19.1 X BHW3 53; 29 2/28-4/20; 9/20-10/18 82 18.8 X BHW4 53 2/28-4/20 53 18.8 X BHWS 87; 18; 48 2/28-5/24; 5/29-6/15; 9/20-11/6 153 30.7 X BHW6 89; 25; 56 2/28-5/26; 5/29-6/22; 9/12-11/6 170 31.4 X BHW7 87; 19; 48 2/28-5/24; 5/29-6/16; 9/20-11/6 154 30.7 X BHW8 52; 17; 17; 49 2/28-4/19; 5/3-5/19; 5/29-6/14; 9/12-10/30 135 18.4 X BHW9 87; 17; 48 2/28-5/24; 5/29-6/14; 9/12-10/29 152 30.7 X BHW10 79; 16; 44 2/28-5/16; 5/29-6/13; 9/12-10/25 170 27.9 X BHW11 89; 25; 56 2/28-5/26; 5/29-6/23; 9/12-11/6 170 31.4 X BHW12 54; 14; 33 2/28-4/21; 5/30-6/12; 9/20-10/22 101 19.1 X BHW13 59; 14; 14; 42 2/28-4/26; 5/3-5/16; 5/31-6/13; 9/12-10/23 129 20.8 X BHW14 59; 15; 41 2/28-4/26; 5/29-6/12; 9/12-10/22 115 20.8 X PC1 42 2/28-4/9 42 14.8 X PC2 52; 18 2/28-4/19; 9/30-10/17 70 18.4 X PC3 50 2/28-4/17 50 17.7 X PC4 52; 17 2/28-4/19; 9/30-10/16 69 18.4 X PC5 54; 29 2/28-4/21; 9/20-10/18 73 19.1 X PC6 52; 28 2/28-4/19; 9/20-10/17 80 18.4 X Bonnerton NRWHF Wetland Hydrology 2020 Update B-5 PCS Phosphate, Inc. September 2021 Appendix B-lb concluded. 2015 GROWING SEASON (BHW wells not installed until June/July) Well Consecutive days WT- 12"orabove Dates Cumulative days of wetland hydroperiods Longest hydroperiod %282-day growing Hydrologic zone of longest hydroperiod <6% >_6-12.5% >12.5-25% >25-75% BHW1 17 11/20-12/6 17 6.1 X BHW2 18 11/19-12/6 18 6.4 X BHW3 15; 34 10/2-10/16; 11/3-12/6 49 12.1 X BHW4 18 11/19-12/6 18 6.4 X BHW5 25; 35 10/1-10/25; 11/2-12/6 60 12.4 X BHW6 16; 67 7/12-7/27; 10/1-12/6 83 23.8 X BHW7 25; 35 10/1-10/25; 11/2-12/6 60 12.4 X BHW8 15; 35 7/12-7/26; 11/2-12/6 50 12.4 X BHW9 15; 33 10/1-10/15; 11/4-12/6 48 11.7 X BHW10 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... BHW11 16; 34 15; 25; 35 10/2-10/17; 11/3-12/6 7/12-7/26; 10/2-10/26; 11/2-12/6 47 75 12.1 12.4 X X BHW12 15; 34 10/2-10/16; 11/3-12/6 49 12.1 X BHW13 16; 34 10/2-10/17; 11/3-12/6 50 12.1 X BHW14 15; 34 10/2-10/16; 11/3-12/6 49 12.1 X PC1 65;16;34 2/28-5/3;10/1-10/16;11/3-12/6 115 23.0 X PC2 65;14;17;34 2/28-5/3;6/3-6/16;10/1-10/17;11/3-12/6 130 23.0 X PC3 65;16;34 2/28-5/3;10/1-10/16;11/3-12/6 115 23.0 X PC4 67;16;17;32 2/28-5/5;6/3-6/18;10/1-10/17;11/5-12/6 132 23.8 X PC5 67;15;17;34 2/28-5/5;6/3-6/17;10/1-10/17;11/3-12/6 133 23.8 X PC6 69;16;18;34 2/28-5/7;6/3-6/18;10/1-10/18;11/3-12/6 137 24.5 X Bonnerton NRWHF Wetland Hydrology 2020 Update B-6 PCS Phosphate, Inc. September 2021 APPENDIX C January — December 2020 Hydrology Graphs NOTE: water levels greater than "30 inches below the ground surface exceed the length of the well casing for the shallow hydrology LeveITROLL monitors. Periods of horizontal water level shown on the hydrology graphs indicate the actual water level is deeper than that horizontal value. BHW1 Water Level (Inches) 30 20 10 0 10 20 - 30 - 40 BHW1 Water Level Jan -Feb 2020, PCS Phosphate •I11I i .li. 01 EN Date 3.5 3 2.5 2 t 1.5 c re 1 0.5 0 o9HW1 •Porter Rainfall 30 20 .-. 10 0 m -1D -20 -30 40 BHW1 Water Level Mar- Apr 2020, PCS Phosphate h., 0.1 0.1 CA Date v 3.5 3 2.5 2 0.5 0 o k3HW1 •Porter Rainfall Bonnerton NRWHF Wetland Hydrology 2020 Update BHW3 WaterLevel (inches) 30 20 10 0 10 - 20 - 30 - 40 BHW1 Water Level May - Jun 2020, PCS Phosphate Date ogl-WW1 •Porter Rainfall C-1 PCS Phosphate Company, Inc. September 2021 BHW3 Water Level (Inches) 30 20 10 0 10 20 -30 -40 BHW1 Water Level Jul - Aug 2020, PCS Phosphate J. 04 04 01 04 01 130 Date 04 (10 3.5 3 2.5 0.5 0 • Porter Rainfall BHW3 Water Level (Inches) 30 20 10 0 BHW1 Water Level Sept - Oct 2020, PCS Phosphate - 10 - - 20 - - 30 - - 40 well data gap 04 04 04 e Date c 0 3.5 3 2.5 2 f, 1.5 c 0.5 0 •eHYv1 •Potler Rainfall Bonnerton NRWHF Wetland Hydrology 2020 Update BHW3 Water Level (inches) 30 20 10 0 - 10 - 20 - 30 -40 BHW1 Water Level Nov - Dec 2020, PCS Phosphate well datag p J. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 01 c DI 04 Date 01 01 6.5 6 5.5 5 4.5 4 3.5 3 ti 2.5 2 1.5 1 0.5 0 o6HIN1 • Porter Rainfall C-2 PCS Phosphate Company, Inc. September 2021 BHW2 Water Level (Inches) 30 20 10 0 - 10 — - 20 — - 30 — - 40 o BHW2 Water Level Jan -Feb 2020, PCS Phosphate 'l ��■ I. 11 Date 3.5 3 2.5 - 0.5 0 ■BHW2 ■Porter Rainfall 30 20 10 c 0 m -10 -20 m - 30 - 40 BHW2 Water Level Mar- Apr 2020, PCS Phosphate ■III � 11., csi Date V V rD 3.5 3 2.5 2 f c 1.5 41 re 1 0.5 0 •BHW2 •Porter Rainfall Bonnerton NRWHF Wetland Hydrology 2020 Update BHW2 Water Level (Inches) 30 20 10 0 - 10 - 20 - 30 40 BHW2 Water Level May - Jun 2020, PCS Phosphate eu Date 3.5 3 2.5 2 t 1.5 E ce 0.5 0 CO EB1-1W2 ■Porter Rainfall C-3 PCS Phosphate Company, Inc. September 2021 BHW2 Water Level (Inches) 30 20 10 0 - 10 - 20 - 30 40 BHW2 Water Level Jul - Aug 2020, PCS Phosphate -4 GO Date GO 3.5 3 2.5 2 1.5 11 rere 1 0.5 0 •BHW2 • Porter Rainfall BHW2 Water Level (Inches) 30 20 10 0 10 20 - 30 - - 40 BHW2 Water Level Sept - Oct 2020, PCS Phosphate Date 3.5 3 2.5 2 1.5 t 1 - 0.5 0 c c 1 c c 0 0 0 0 0 c 0 •BHW2 •Potler Rainfall Bonnerton NRWHF Wetland Hydrology 2020 Update BHW2 Water Level (inches) 30 20 10 0- - 10 - - 20 - - 30 - - 40 BHW2 Water Level Nov - Dec 2020, PCS Phosphate 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 CV 04 c c c c c • c c c c c c c c c• 01 IN ▪ IN DJ IN • c c e Date 6.5 6 5.5 5 4.5 4 3.5 3 4,5 2.5 2 1.5 1 0.5 0 o RI4N2 • Porter Rainfall C-4 PCS Phosphate Company, Inc. September 2021 BHW3 Water Level (Inches) 30 20 10 0 - 19 - 20 BHW3 Water Level Jan -Feb 2020, PCS Phosphate - 30 ��. I. 11 ao .I IIIII •11. Date 04 O 4 3.5 3 2.5 2 5 1.5 41 af0' 0.5 0 •BHW3 •Porter Rainfall BHW3 Water Level (Inches) 30 20 10 0 -10 - 20 - 30 -40 BHW3 Water Level Mar- Apr 2020, PCS Phosphate 04 Date 04 04 rD 3.5 3 2.5 2 5 c 1.5 ce 0.5 0 •B1-11V3 •Porter Rainfall Bonnerton NRWHF Wetland Hydrology 2020 Update BHW3 Water Level (inches) 30 20 10 0 - 10 - 20 - 30 a0 BHW3 Water Level May - Jun 2020, PCS Phosphate ND. ▪ LO Date 3.5 3 2.5 2 5 c - 0.5 0 •BI W3 • Porter Rainfall C-5 PCS Phosphate Company, Inc. September 2021 3D 20 m 10 - 0 1 -10 -20 - 30 - 40 BHW3 Water Level Jul - Aug 2020, PCS Phosphate Pfr miNk. 04 01 04 04 04 03 Date 04 03 03 03 04 03 3.5 3 2.5 2 t 1.5 r re 0.5 0 •BHW3 • Porter Rainfall BHW3 Water Level (Inches) 30 20 1D 0 10 2D -30 -40 BHW3 Water Level Sept - Oct 2020, PCS Phosphate Date c R c 0 • 3.5 3 2.5 2 1.5 t 1 0.5 0 oBHN3 •Porter Rainfall Bonnerton NRWHF Wetland Hydrology 2020 Update BHW3 Water Level (inches) 30 20 10 0 10 -20 - -30 - -40 BHW3 Water Level Nov - Dec 2020, PCS Phosphate 01 Date 6.5 6 5.5 5 4.5 4 3.5 3 t 2.5 2 1.5 1 0.5 0 C 0.1 n BHW3 •Porter Rainfall C-6 PCS Phosphate Company, Inc. September 2021 BHW4 Water Leval (Inches) 30 20 10 0 10 -20 - -30 - -40- 0.1 BHW4 Water Level Jan -Feb 2020, PCS Phosphate o Date 3.5 3 2.5 2 1.5 E 0.5 0 ERHW4 •Porter Rainfall BHW4 Water Level (inches) 30 20 1D 0 -10 -20 -30 -40 BHW4 Water Level Mar- Apr 2020, PCS Phosphate I .I1l li.. r I N N a a M M M c a s 4118120 = 0.1 Date 3.5 3 2.5 • 2 1.5 E 0.5 0 oBHW4 • Porter Rainfall Bonnerton NRWHF Wetland Hydrology 2020 Update BHW4 Water Level (inches) 30 20 10 0 -10 -20 -30 -40 BHW4 Water Level May - Jun 2020, PCS Phosphate 1.0 1.0 Date 3.5 3 2.5 - 0.5 0 •1314W4 •Porter Rainfall C-7 PCS Phosphate Company, Inc. September 2021