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HomeMy WebLinkAboutBackground GW Dataset Eval_20161215F)I Technical Memorandum Date: Monday, December 12, 2016 Project: Dan River Steam Station To: Kim Witt and Melonie Martin From: Jacob Ruffing Subject: Additional Background Monitoring Well Determinations The purpose of this memorandum is to provide justification for additional monitoring wells that should be considered as background wells for the Dan River Steam Station (DRSS) ash basin. Monitoring wells BG -1D, GWA-9S, GWA-9D, GWA-12S, GWA-12D, MW -23D, and MW-23BR were previously evaluated and selected to represent background groundwater quality, as documented in Appendix B of the DRSS Corrective Action Plan (CAP) Part 1, dated November 16, 2015. Well locations are shown on Figure 1. The proposed additional background monitoring wells at DRSS include BG -5S, BG -5D, BG - 10S, BG -1 OD, BG-10BR, GWA-18D, MW -20S, and MW -20D. These potential background wells are proposed based on evaluation of the following criteria: groundwater flow direction, groundwater elevation as compared to the nearest ash basin surface water or porewater elevation, historical analytical results, and horizontal distance to the ash source area. Distances and elevations pertinent to the evaluation are provided on Table 1. Additional details are provided for each monitoring well cluster on the following pages of this memorandum. Historical analytical data for previously evaluated background wells (CAP Part 1) and the potential background wells listed above are provided in Table 2. The background wells and analytical data are separated by groundwater flow layer (shallow, deep and bedrock) and a valid sample count is provided for each constituent. Samples with field measured turbidity greater than 10 nephelometric turbidity units (NTU) and/or pH greater than 8.5 standard units (SU) are denoted with red -colored text and were not included in the valid sample counts. BG-5S/D Monitoring wells BG-5S/D were installed as upgradient monitoring wells during the CSA. Nine groundwater gauging events, from June 2015 to August 2016, have been considered for determining groundwater elevations and flow direction in this area of the site. • Monitoring wells BG-5S/D are located approximately 2,700 feet northwest of the ash basin waste boundary. The ground surface at the monitoring wells (approximately 512 feet) is 12 feet higher than the edge of the ash basin waste boundary (500 feet). • The lowest elevation of the northern extent of Ash Storage 2 is approximately 590 feet. F)I • BG -5S is screened from approximately 11 feet to 21 feet below ground surface (ft bgs) (approximately 501 to 491 feet elevation) in the shallow flow layer. The average groundwater elevation was 508.21 (approximately 82 feet lower than the base of Ash Storage 2 at the northern edge). • The groundwater surface near Ash Storage 2 is below the bottom of the ash, therefore the ash should not impact BG -5S groundwater quality. • BG -51D is screened from approximately 29 to 34 ft bgs (approximately 483 to 478 feet elevation) in the deep flow layer. The average groundwater elevation was 507.9 feet (approximately 82 feet lower than the bottom of the ash storage). • Boron was not reported in these wells at concentrations which equal or exceed the laboratory method reporting limit. Sulfate was reported at an order of magnitude less than the 2L Standard. Chloride was reported approximately two orders of magnitude less than the 2L Standard. • Based on analytical data, groundwater flow, and groundwater/surface water elevation data, groundwater in monitoring wells BG-5S/D originates northeast of the wells and cross -gradient from the ash storage area and ash basin and is not impacted by ash disposal areas. Based on the justification provided above and analytical data included in Table 2, monitoring wells BG-5S/D represent background water quality relative to the ash disposal areas at the site and have been included in the valid background sample counts. BG-10S/D/BR Monitoring wells BG-10S/D/BR were installed as upgradient monitoring wells during the Post CSA Additional Assessment in June 2016. One groundwater gauging event, in the third quarter of 2016, has been considered for determining groundwater elevations and flow direction. • Monitoring wells BG-110S/D/BR are located approximately 1,540 feet north of the ash storage waste boundary. The ground surface at the monitoring wells (approximately 596 feet) is 6 feet higher than the edge of ash storage waste boundary (590 feet). • The lowest elevation of the northern extent of Ash Storage 1 is approximately 590 feet. • BG -10S is screened from approximately 30 to 40 feet bgs (approximately 566 to 556 feet elevation) in the shallow flow layer. The water level elevation was 570.3 feet during (approximately 20 feet lower than the base of ash in Ash Storage 1). • BG -10D is screened from approximately 43 to 48 feet bgs (approximately 553 to 548 feet elevation) in the deep flow layer. The water level elevation was 550.15 feet during (approximately 40 feet lower than the base of ash in Ash Storage 1). • BG-10BR is screened from approximately 75 to 80 feet bgs (approximately 521 to 516 feet elevation) in the bedrock flow layer. The water level elevation was 569.04 feet (approximately 21 feet lower than the base of ash in Ash Storage 1). • Boron was not reported in these wells at concentrations which equaled or exceeded the laboratory method reporting limit. Chloride and sulfate were reported approximately two orders of magnitude less than the 2L Standards. 2 F)I • Based on analytical data, groundwater flow, and groundwater/surface water elevation data, groundwater in monitoring wells BG-110S/D/BR originates offsite, upgradient, and north of the monitoring well locations and is not impacted by ash disposal areas. Based on the justification provided above and the analytical data included in Table 1, monitoring wells BG-10S/D/BR represent background water quality relative to the ash disposal areas at the site and have been included in the valid background sample counts. AW -115 We Monitoring well GWA-18D was installed during the CSA. One groundwater gauging event, in the third quarter of 2016, has been considered for determining groundwater elevations and flow direction. • Monitoring well MW -18D is located approximately 600 feet north of the ash storage waste boundary. The ground surface at the monitoring well (approximately 595 feet) is 5 feet higher than the elevation near the ash storage waste boundary (590 feet). • The lowest elevation of the northern extent of Ash Storage 1 is approximately 590 feet. • The average groundwater elevation was 551.38 feet (approximately 39 feet lower than the base of ash in Ash Storage 1). • Boron was not reported in this well at concentrations which equaled or exceeded the laboratory method reporting limit. Chloride and sulfate were reported at least two orders of magnitude less than the 2L Standards. • Based on analytical data, groundwater flow, and groundwater/surface water elevation data, groundwater in monitoring well GWA-18D originates offsite, upgradient, and north of the monitoring well locations and is not impacted by ash disposal areas. Based on the justification provided above and analytical data provided in Table 2, monitoring well GWA-18D represents background water quality relative to the ash disposal areas at the site and has been included in the valid background sample count. MW-20S/D Monitoring wells MW-20S/D were installed as NPDES compliance groundwater monitoring wells in 2010. Fifteen groundwater gauging events, from January 2011 to June 2015, have been considered for calculating groundwater elevations and flow direction in this area of the site. • Monitoring wells MW-20S/D are located approximately 600 feet north of the ash storage area waste boundary. The ground surface at the monitoring wells (approximately 560 feet) is 30 feet lower than the ash storage waste boundary (590 feet). • The lowest elevation of the northern extent of the ash storage area is approximately 590 feet. F)I • MW -20S is screened from approximately 7.5 to 22.5 feet bgs (552.5 to 537.5 feet elevation) in the shallow flow layer. The average groundwater elevation was 556.1 feet (approximately 34 feet lower than the base of ash in Ash Storage 1). • MW -20D is screened from approximately 39 to 44 feet bgs (520 to 515 feet elevation) in the deep flow layer. The average groundwater elevation was 557.63 feet (approximately 33 feet lower than the base of ash in Ash Storage 1). • The groundwater surface near Ash Storage 2 is below the bottom of the ash, therefore the ash should not impact MW-20S/D groundwater quality. • Boron was not reported in these wells at concentrations which equaled or exceeded the laboratory method reporting limit. Chloride and sulfate were reported approximately two orders of magnitude less than the 2L Standards. • Based on analytical data, groundwater flow, and groundwater/surface water elevation data, groundwater in monitoring wells MW-20S/D originates offsite and north of the monitoring well locations and is not impacted by ash disposal areas. Based on the justification provided above and analytical data included in Table 2, monitoring wells MW-20S/D represent background water quality relative to the ash disposal areas at the site and have been included in the valid background sample counts. 4 NOTES: 1. WASTE BOUNDARY AND ASH STORAGE AREA BOUNDARIES ARE APPROXIMATE 2. THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107 (a) 3. AERIAL IMAGERY IS A COMBINATION OF A WSP AERIAL SURVEY (2014) AND NC ONEMAP (2010) 4. HYDROGRAPHY WAS DIGITIZED FROM USGS 1:24,000 SCALE TOPOGRAPHICAL MAPS 5. AS -BUILT CAMA ASSESMENT AND NPDES SERIES WELLS HAVE BEEN PROVIDED BY WSP AND DUKE ENERGY SCALE (FEET) 500 0 500 1,000 FEZ WELL LOCATION MAP DUKE ENERGY CAROLINAS, LLC DAN RIVER STEAM STATION ASH BASIN ROCKINGHAM COUNTY, NORTH CAROLINA DATE DECEMBER 2016 FIGURE Table 1. Monitoring Well Information Distance and Direction from Source Area Closest Ash Ash Groundwater Ground Elevation of Average Basin Surface Well ID Ash Basin Storage Flow Surface Screened Elevation of Water Elevation Groundwater Elevation Monitoring Events (Primary/ Area Direction Elevation Interval Groundwater to Well Secondary (Ash (ft msl) (ft msl) (ft msl) (feet) Cell) Storage 1 & 2) CAP 1 Evaluated Background Monitoring Wells MW 2,200 540 2015 —June, September, December 23D 3,200 feet NW feet SE 524 504-514 514.93 (Primary Cell) 2016 — March, June, September W 2,200 —527 23BR 3,200 feet NW feet SE 524 463-468 (artesian) (Primary Cell) NA GWA- 895 feet 540 2015 — June, September, November, 9S 2,100 feet NW N SE 608 561-576 583.36 (Primary Cell) December 2016 — March, June, September GWA- 895 feet 540 2015 — June, September, November, 9D 2100 feet NW , N S 608 536-541 . 58214 (Primary Cell) ember 2016 — March, June, September GWA- 1,000 540 2015 — June, September, November, 2,300 feet NW feet S 582 567-577 572.13 (Primary Cell) December W 2016 — March, June, September GWA- 1,000 540 2015 — June, September, November, 2,300 feet NW feet S 582 550-555 564.81 (Primary Cell) December W 2016 — March, June, September 3200 540 2015 — June, September, November, BG -1 D 1,800 feet SW feet SW S 513 499-504 500.45 (Primary Cell) December 2016 — March, September Potential Additional Background Monitoring Wells for Evaluation 2200 2015 — June, September, November, BG -5S 2,700 feet NW feet SW SW 512 491-501 508.21 (Primary Cell) December 2016 — March, June, September 2200 540 2015 — June, September, November, BG -5D 2,700 feet NW feet SW SW 512 478-483 507.90 (Primary Cell) December 2016 — March, June, September BG -10S 3,100 feet NW S. 596 566-556 570.73 2016 - June fee4N Pri aro Cell BG -1 OD 3,100 feet NW S* 596 553-548 550.15 NA fee4N (Primary Cell 3,100 feet NW S* 596 521-516 569.04 40 2016 - June 106- fee4N Prim Cell Table 1. Monitoring Well Information 1. Elevations presented in North American Vertical Datum (NAVD) 88. 2. The groundwater elevations presented are the averaged based on available groundwater elevation measurements from sampling/gauging events at the site. 3. Ash basin surface water elevations surveyed during the June 2016 gauging event. 4. * indicates monitoring well is scheduled for replacement due to potential grout contamination. Distance and Direction from Source Area Closest Ash Ash Groundwater Ground Elevation of Average Basin Surface Well ID Ash Basin Storage Flow Surface Screened Elevation of Water Elevation Groundwater Elevation Monitoring Events (Primary/ Area Direction Elevation Interval Groundwater to Well Secondary (Ash (ft msl) (ft msl) (ft msl) (feet) Cell) Storage 1 & 2) MW 2,100 feet NW 600 feet SSE 560 552.5-537.5 556.10 540 2015 — June, September 20S NW Primary Cell MW 2,100 feet NW 600 feet SSE 559 520-515 557.63 540 2015 — June, September 20D NW Prima Cell GWA- 1,450 feet N 515 feet S 595 Unk 551.38 540 2016 - June 18D N Primary Cell 1. Elevations presented in North American Vertical Datum (NAVD) 88. 2. The groundwater elevations presented are the averaged based on available groundwater elevation measurements from sampling/gauging events at the site. 3. Ash basin surface water elevations surveyed during the June 2016 gauging event. 4. * indicates monitoring well is scheduled for replacement due to potential grout contamination. Table 2. Analytical Results Notes: Red text indicates samples that will not be used in determining proposed provisional background threshold values (PPBTVs) due to pH > 8.5 or turbidity >10 NTU. 0 - Bold highlighted concentration indicates exceedance of the 15A NCAC 02L Standard or IMAC, Appendix 2, April 1, 2013. Nm = micron Ng/L = micrograms per liter NS/cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter Eh values were calculated by adding 200 mV to the field -measured ORP value. Depending on the field meter used, Eh values calculated using this formula can vary by +/- 5 mV mV = millivolts NTU - nephelometric turbidity units pCi/L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard PPBC = Proposed Provisional Background Concentrations T = total TDS = total dissolved solids TOC = total organic carbon * BG -1D is scheduled for replacement due to potential grout contamination FIELD PARAMETERS WATER QUALITY PARAMETERS SELECTED 40CFR257 APPENDIX III CONSTITUENTS INORGANIC PARAMETERS (TOTALS) RADIONUCLIDES Analytical Parameter 15A NCAC 02L, DHHS, IMAC: Reporting Units: pH 6.5 - 8.5 SU Eh NS mV Oxidation Reduction Potential NS mV Dissolved Oxygen NS mg/I Specific Conductance NS PS/cm Turbidity NS NTU Temperature NS Deg C Alkalinity NS ug/I Carbonate Alkalinity NS ug/I Bicarbonate Alkalinity NS ug/I Methane NS ug/I Sulfide NS ug/I Total Organic Carbon NS ug/I Total Suspended Solids NS ug/I Boron 700 ug/I Calcium NS ug/I Chloride 250000 ug/I Strontium NS ug/I Sulfate 250000 ug/I Total Dissolved Solids 500000 ug/I Aluminum NS ug/I Antimony 1 ug/I Arsenic 10 ug/I Barium 700 ug/I Beryllium 4 ug/I Cadmium 2 ug/I Chromium 10 ug/I Chromium (VI) 0.07 ug/I Cobalt 1 ug/I Copper 1000 ug/I Iron 300 ug/I Lead 15 ug/I Magnesium NS ug/I Manganese 50 ug/I Mercury 1 ug/I Molybdenum NS ug/I Nickel 100 ug/I Nitrogen, NO2 plus NO3 NS ug/I Potassium NS ug/I Selenium 20 ug/I Sodium NS ug/I Thallium 0.2 ug/I Vanadium 0.3 ug/I Zinc 1000 ug/I Radium- 226 NS pCi/L Radium- 228 NS pCi/L Uranium, Natural NS ug/I Uranium- 233 NS ug/I Uranium- 234 NS ug/I Uranium - 236 NS ug/I Well/Sample ID Collection Date Shallow Flow Layer 7WA-9S 6/19/2015 5.55 531.5 331.5 4.17 39.3 235.9 23.8 9100 < 5000 U 9100 2.33+ < 100 U 14200 239000 < 50 U 1050 4200 21 650 J 161000 4300 0.221 0.63 42 0.67 0.0363 3.5 -- 9.3 4.5 J+ 5100 4.3 890 220 0.073 J+ 0.3 J 6.1 J+ 48 < 5000 U 0.56 6980 0.034 J 5.1 20 -- -- -- -- -- GWA-9S 9/9/2015 5.1 487 287 4.52 48.1 7.2 19 5700 < 5000 U 5700 2.73+ < 100 U < 1000 U 30200 < 50 U 584 4000 9.1 2700 50000 630 < 0.5 U < 0.5 U 17 0.23 0.0341 0.973+ -- 4.7 1.4 750 0.38 558 110 < 0.2 U < 0.5 U 2.9 36 < 5000 U < 0.5 U 5390 < 0.1 U 0.593 16 -- -- -- -- -- -- GWA-9S 11/16/2015 5.3 441.6 241.6 1.61 45.2 9.24 16.3 49003 < 5000 U 49003 1.7 J+ < 100 U < 1000 U 6900 < 50 U 8351+ 4100 9.3 6400 36000 300 < 0.5 U < 0.5 U 14 0.21 0.0531 0.821+ 0.083 6.7 1.5 290 0.39 753 140 < 0.2 U < 0.5 U 3.9 31 < 5000 U < 0.5 U 5960 < 0.1 U 0.651 11 J+ -- -- -- -- -- -- GWA-9S 12/15/2015 5.3 411.3 211.3 1.6 54.9 8.2 19.5 7800 < 5000 U 7800 1.93+ < 100 U < 1000 U 5900 < 50 U 1130 4200 15 7000 36000 300 < 0.5 U < 0.5 U 14 0.191 0.0373 0.583+ 0.027 J 6.5 1.8 370 0.25 896 160 < 0.2 U < 0.5 U 3.9 423+ < 5000 U < 0.5 U 6460 < 0.1 U 0.743 16 -- -- -- -- -- -- GWA-9S 3/28/2016 5.7 349.8 149.8 3.84 47.2 6.14 16 12300 < 5000 U 12300 1.53+ < 100 U < 1000 U 2800 < 50 U 1050 4300 23.9 4100 70000 96.91 < 0.5 U < 0.1 U 8.7 0.0983 < 0.08 U 0.331+ 0.077 3.3 0.89 111 0.091 537 76.3 < 0.2 U < 0.5 U 2.2 50 32501 < 0.5 U 7150 < 0.1 U 0.1 J 32.2 0.0702 0.273 < 0.5 U -- -- -- GWA-9S 6/17/2016 5.1 494.2 294.2 4.6 38.9 2.5 18 6800 < 5000 U 6800 < IOU < 100 U -- 2900 < 50 U 468 3800 10.1 2600 < 25000 U < 100 U < 0.5 U < 0.1 U 7.8 0.13 < 0.08 U 0.9 0.143 2.4 0.84 34.53 < 0.1 U 458 56.6 < 0.2 U < 0.5 U 2 73 < 5000 U < 0.5 U 5950 < 0.1 U < 0.3 U < 10 U 0.119 1.18 < 0.5 U -- -- - GWA-9S 9/28/2016 5.3 484.9 284.9 2.6 35.4 8.47 21.1 6800 < 5000 U 6800 < 10 U < 100 U -- 21100 < 50 U 360 4400 7.3 1200 62000 69.81+ 0.151+ < 0.1 U 8.6 0.161+ < 0.08 U 1.1 J+ 0.17 1.3 0.951+ 66.2 < 0.1 U 445 35.4 0.09 J+ < 0.5 U 1.7 69 < 5000 U < 0.5 U 5850 < 0.1 U < 0.3 U 5.7 J+ -- -- < 5 U -- - -- GWA-12S 6/4/2015 5.45 521 321 4.85 151.3 2.38 18.3 28000 < 10000 U 28000 < IOU < 100 U 6973+ < 5000 U < 50 U 12200 3000 140 41000 110000 190 < 1 U < 1 U 55 < 1 U < 1 U 1.01 -- < 1 U < 1 U 185 < 1 U 5960 150 < 0.05 U < 1 U 3.09 -- 1690 < 1 U 7920 < 0.2 U < 0.3 U < 5 UJ -- -- -- -- -- -- GWA-12S 9/11/2015 5.2 437.2 237.2 3.96 286.1 4.8 19.4 11900 < 5000 U 11900 1.81+ < 100 U 7101 3000 < 50 U 10100 1700 140 46100 105000 350 < 0.5 U 0.163 54 < 0.2 U < 0.08 U 1.4 -- 0.493 1.3 460 0.24 6070 45 < 0.2 U 0.11 J 3.4 580 < 5000 U < 0.5 U 7010 < 0.1 U 0.933 5.9 J -- -- -- -- -- -- GWA-12S 12/18/2015 -- -- -- -- -- -- -- 6000 < 5000 U 6000 3.23+ < 100 U 1300 < 2500 U < 50 U 7210 2700 100 32400 87000 560 0.19 J 0.483 41 0.0813 < 0.081_1 3.4 0.26 0.47 J 1.4 J+ 890 0.35 4370 37 < 0.2 U 0.11 3.7 790 < 5000 U 0.263 5630 < 0.1 U 2.41+ 6.91 -- -- -- -- -- -- GWA-12S 3/28/2016 5.7 413.1 213.1 3.13 103 42.2 19.5 9700 < 5000 U 9700 1.53+ < 100 U 1300 < 2500 U < 50 U 6760 3300 93 24900 109000 812 < 0.5 U 0.38 35.9 0.068 J < 0.08 U 2.21+ 0.27 0.42 1.6 1440 0.58 4160 23.7 < 0.2 U < 0.5 U 2.7 1500 < 5000 U 0.52 5720 < 0.1 U 2.7 3.51 0.771 0.718 0.0711 -- -- -- GWA-125 6/21/2016 5.2 464.8 264.8 3.2 123.3 2 20.5 18100 < 5000 U 18100 < 10 U < 100 U -- < 3000 U < 50 U 8680 3900 104 24000 73000 96.5 J < 0.5 U 0.16 36.8 0.033 < 0.08 U 0.84 0.56 0.16 0.443 90.1 < 0.1 U 4320 25.6 < 0.2 U < 0.5 U 2.4 1000 < 5000 U < 0.5 U 6740 < 0.1 U 0.42 7.63 -0.207 0.359 < 0.5 U - -- -- GWA-125 9/29/2016 5.1 513.9 313.9 2 109.6 9.31 21.7 10100 < 5000 U 10100 < 10 U < 100 U - < 2500 U < 50 U 9220 1200 108 35600 64000 292 < 0.5 U 0.18 41.2 0.0783+ < 0.08 U 0.82 J+ 0.223 0.3 1.7 412 0.18 5540 23.4 < 0.2 U < 0.5 U 3 380 < 5000 U < 0.5 U 6150 < 0.1 U 0.98 9.9 J+ -- -- < 0.5 U - -- - Valid Sample Count 10 10 10 10 10 10 10 10 6 10 10 10 10 10 10 10 10 10 10 10 10 10 10 7 10 10 10 10 10 10 10 10 10 9 10 10 10 10 10 10 3 3 5 0 0 0 Dee Flow Laye BG -1D 11/16/2015 11.4 232.3 32.3 3.89 632 0.85 131 156000 81600 74200 2.23+ < 100 U 1800 < 2500 U 69 66800 6400 100 86800 309000 1000 0.46 J 2.4 < 5 U < 0.2 U < 0.08 U 25.3 24.9 0.381 2.6 31 J < 0.1 U 74.73 < 5 U < 0.2 U 18 0.4 J 310 6500 1.2 32400 0.017 J 45.8 < 10 U -- -- -- -- -- -- BG-1D 12/15/2015 10.8 251.2 51.2 6.3 435.4 1.56 18.4 117000 85000 < 5000 U 1.5 J+ < 100 U 2000 10800 58 63600 6600 110 92400 338000 760 0.6 2.3 < 5 U < 0.2 U < 0.08 U 16.1 16.9 0.33 J 2.3 J+ < SOU 0.047 J+ 237 < 5 U < 0.2 U 16.5 1.93+ 300 6360 0.9 32900 0.017 J 43 10 J+ -- -- -- -- -- -- BG-1D 3/28/2016 8.5 361 161 5.01 403.2 3.45 16.7 72400 12100 60300 -- < 100 U 1300 < 5300 U 93.1 36100 -- 112 -- 281000 106 1.1 2.1 2.6 J < 0.1 U < 0.08 U 6.4 -- 0.3 1.2 54.2 < 0.1 U 11200 < 5 U < 0.2 U 17.6 1.1 220 4900 J 0.51 29300 < 0.1 U 20.1 < 10 U -- -- -- -- -- -- BG-1D 4/4/2016 9.4 326.7 126.7 5.55 352.9 7.32 12.5 -- -- -- 1.9 J+ -- -- -- -- -- 5900 -- 106000 -- -- -- -- -- -- -- -- 4 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- GWA-9D 6/15/2015 6.4 290.8 90.8 0.16 141.9 16.28 26.1 57000 < 10000 U 57000 < 10 U < 500 U < 1000 U 16100 < 50 U 17700 2000 64 4200 113000 1270 < 0.5 U 2.3 23 0.085 J < 0.08 U 2.9 -- 1.2 2.1 J+ 3290 0.67 J+ 3050 640 0.0723 0.52 3.21+ < 20 U < 5000 U < 0.5 U 6140 < 0.1 U 1.8 8.9 J+ -- -- -- -- -- -- GWA-9D 9/9/2015 6.3 261.3 61.3 0.47 156.7 0.9 17.6 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- GWA-9D 9/9/2015 6.3 261.3 61.3 0.47 156.7 0.9 17.6 47600 < 5000 U 47600 3 J+ < 100 U 17500 < 5000 U < 50 U 14200 2100 55 4300 91000 < 100 U < 0.5 U 0.67 21 < 0.2 U < 0.08 U 1.23+ -- 0.38 J < 1 U 2000 < 0.1 U 2620 720 < 0.2 U 0.12 J 1.2 < 20 U < 5000 U < 0.5 U 5510 < 0.1 U < 1 U < 10 U -- - -- - -- - GWA-9D 11/16/2015 6.1 201.5 1.5 0.31 89.6 9.97 18.2 32000 < 5000 U 32000 2.6 J+ < 100 U < 1000 U 5800 38 J 8270 2900 31 6000 42000 210 < 0.5 U 0.84 15 < 0.2 U < 0.08 U 2.5 J+ < 0.03 U 0.9 0.4 J 2600 0.32 2260 620 < 0.2 U 0.27 J 3.7 < 20 U < 5000 U < 0.5 U 5000 < 0.1 U 0.383 12 J+ -- -- -- -- -- -- GWA-9D 12/15/2015 5.8 242 42 0.5 84.4 1.9 14.5 25400 < 5000 U 25400 1.9 J+ < 100 U < 1000 U 5900 < 50 U 7150 3100 27 6000 90000 < 100 U < 0.5 U 0.84 13 < 0.2 U < 0.08 U 1.4 J+ < 0.03 U 0.88 0.47 J 2300 0.14 2030 530 < 0.2 U < 0.5 U 2.5 < 20 U < 5000 U < 0.5 U 48503 < 0.1 U 0.39 J 16 -- -- -- -- -- -- GWA-9D 3/28/2016 6 237 37 0.4 76.1 4.19 15.2 24700 < 5000 U 24700 1.7 J+ < 100 U < 1000 U < 2500 U < 50 U 6790 3100 28.1 7100 81000 < 100 U < 0.5 U 0.56 13 0.039 J < 0.08 U 0.27 J+ < 0.03 U 0.84 < 0.5 U 2120 < 0.1 U 1980 520 < 0.2 U 0.123 2 < 20 U < 5000 U < 0.5 U 48903 < 0.1 U < 0.3 U 5.2 J 0 0.0736 < 0.5 U -- -- -- GWA-9D 6/17/2016 5.8 274.9 74.9 1.6 73.5 1.9 23.1 28000 < 5000 U 28000 < 10 U < 100 U -- < 2500 U < 50 U 6580 2400 26.8 5200 46000 < 100 U < 0.5 U 0.57 11.6 0.0323 < 0.08 U 0.363 < 0.03 U 0.85 0.67 2130 < 0.1 U 1870 522 < 0.2 U < 0.5 U 2.2 < 20 U < 5000 U < 0.5 U 4600 J < 0.1 U < 0.3 U 42 -0.189 0.201 < 0.5 U -- -- -- GWA-9D 9/28/2016 5.8 236 36 6.53 82.3 13.6 19.9 28300 < 5000 U 28300 < 10 U < 100 U -- < 2500 U < 50 U 7370 2900 27.5 5200 72000 111 J+ 0.18 J+ 0.47 12.6 0.044 J+ < 0.08 U 0.74 J+ < 0.15 U 0.84 0.841+ 2180 0.19 2130 527 < 0.2 U 0.11 J 2.1 121 < 5000 U < 0.5 U 4840 J < 0.1 U 0.089 J 4.3 J+ -- -- < 5 U -- -- - GWA-12D 6/4/2015 7.47 118.6 -81.4 0.47 396.7 8.35 17.7 190000 < 10000 U 190000 < 10 U < 500 U 2023+ 16000 < 50 U 51700 3900 526 16000 250000 < 5 U < 1 U 3.71 17 < 1 U < 1 U 2.87 -- < 1 U 3.93+ 54 1.74 16400 49 < 0.05 U 1.52 3.37 -- 1000 < 1 U 9470 < 0.2 U 5.65 < 5 UJ -- -- - -- -- -- GWA-12D 9/9/2015 7.3 175.8 -24.2 0.37 525.9 4.4 21 196000 < 5000 U 196000 1.81+ < 100 U < 1000 U 7200 < 50 U 54700 3300 520 15300 257000 81 J 0.19 J 2.7 16 < 0.2 U < 0.08 U 0.43 J+ -- 0.35 J 0.52 J 100 0.0813 18000 403+ < 0.2 U 0.8 3.4 170 < 5000 U < 0.5 U 9730 < 0.1 U 3.7 12 -- -- -- -- -- -- GWA-12D 11/19/2015 7.4 130.3 -69.7 0.5 385.3 7.13 17.8 192000 < 5000 U 192000 1.93+ < 100 U < 1000 U < 2600 U < 50 U 52000 3700 580 18700 265000 100 0.18 J 2.2 22 < 0.2 U < 0.08 U 0.423 -- 0.133 0.423 140 0.13 16700 37 < 0.2 U 0.56 0.77 86 < 5000 U < 0.5 U 9060 < 0.1 U 3.1 < 10 U -- -- -- -- -- -- GWA-12D 12/15/2015 7.6 121 -79 1.2 371.6 2.5 16.6 174000 < 5000 U 174000 4.13+ < 100 U < 1000 U < 2500 U < 50 U 48900 3800 560 18500 261000 51 J < 0.5 U 2.2 21 < 0.2 U < 0.08 U 0.21 J 0.021 J < 0.5 U 0.26 J 130 < 0.1 U 16200 36 < 0.2 U 0.343 0.33 J 83 < 5000 U < 0.5 U 8410 < 0.1 U 2.3 3.7 J+ -- -- -- -- -- -- GWA-12D 3/28/2016 7.4 179.4 -20.6 0.5 360.5 0.82 19.6 201000 < 5000 U 201000 3.1 J+ < 100 U < 1000 U < 2500 U < 50 U 50900 4000 601 19600 260000 < 100 U < 5 U 2.3 24 0.12 J < 0.8 U < 5 U < 0.03 U 0.25 J < 5 U 82.3 < 1 U 17800 31.1 < 0.2 U < 5 U < 5 U 100 < 5000 U < 5 U 9690 < 1 U 3.5 < 10 U -0.071 -0.141 0.41 -- -- -- GWA-12D 6/20/2016 7.4 154.6 -45.4 0.2 365.9 0.5 22.3 191000 < 5000 U 191000 < 10 U < 100 U -- < 2500 U < 50 U 50200 3400 600 18000 243000 < 100 U < 0.5 U 2 24.7 0.0273 < 0.08 U 0.25 J 0.025 J 0.0793 < 0.5 U 61.5 < 0.1 U 16600 34.3 < 0.2 U 0.47 J < 0.5 U 130 < 5000 U < 0.5 U 8860 < 0.1 U 0.82 < 10 U 0 0.274 0.283 -- -- -- GWA-12D 9/29/2016 7.5 127.4 -72.6 0.75 381.6 0.36 19.7 198000 < 5000 U 198000 < 10 U < 100 U - < 2500 U < 50 U 60000 3800 565 18600 246000 < 100 U < 0.5 U 1.6 23 < 0.1 U < 0.08 U < 0.5 U < 0.03 U 0.11 0.183+ 82.9 < 0.1 U 19800 30.7 < 0.2 U 0.5 J < 0.5 U 280 < 5000 U < 0.5 U 9880 < 0.1 U 1.6 < 10 U -- -- 0.393 -- - -- MW-23D 1/4/2011 6.9 -- -- -- 354.6 13.8 12.46 -- -- -- - -- -- -- < 50 U -- -- -- 30000 204000 -- < 1 U < 1 U 71 -- < 1 U < 5 U -- -- < 5 U 326 < 1 U -- 403 < 0.05 U -- < 5 U -- -- < 1 U -- - -- < 5 U -- - -- -- -- -- MW-23D 5/5/2011 5.92 - -- -- 186.2 29.1 12.17 -- - -- - -- - -- < 50 U - -- - 46000 140000 -- < 1 U < 1 U 38 -- < 1 U < 5 U -- -- < 5 U 592 < 1 U -- 21 < 0.05 U -- < 5 U -- -- < 1 U -- - -- < 5 U -- - -- - -- -- MW-23D 9/7/2011 6.14 -- -- -- 139 52 18.63 -- - -- -- -- -- -- < 50 U - -- 31000 99000 -- < 1 U < 1 U 34 -- < 1 U < 5 U - -- < 5 U 1050 < 1 U -- 26 < 0.05 U -- < 5 U -- -- < 1 U -- - -- 9 -- - -- -- -- MW-23D 1/12/2012 6.16 589 389 7.8 115 75.2 11.41 -- - -- -- -- -- -- < 50 U -- 23000 120000 -- < 1 U < 1 U 35 -- < 1 U < 5 U - -- < 5 U 1410 < 1 U -- 45 < 0.05 U -- < 5 U -- -- < 1 U -- - -- 9 -- -- -- -- MW-23D 5/7/2012 6.7 478 278 6.82 463 69.7 15.73 -- - -- -- -- -- < 50 U -- 31000 202000 -- < 1 U < 1 U 93 -- < 1 U < 5 U -- < 5 U 1700 1.15 -- 192 < 0.05 U -- < 5 U -- -- < 1 U -- - -- 10 -- - -- -- -- MW-23D 9/4/2012 6.75 465 265 7.27 434 70.3 20.6 -- - -- - - -- -- < 50 U -- -- 31000 250000 -- < 1 U < 1 U 108 -- < 1 U < 5 U - -- < 5 U 517 < 1 U -- 468 < 0.05 U -- < 5 U -- -- < 1 U -- - -- < 5 U - - -- -- -- MW-23D 1/7/2013 6.34 524 324 3.57 284 14.3 11.22 110000 - -- -- -- -- -- < 50 U 37200 -- - 33000 190000 -- < 1 U < 1 U 49 -- < 1 U < 5 U - -- < 5 U 522 < 1 U 12500 47 < 0.05 U -- < 5 U -- 1790 < 1 U 6820 - -- < 5 U -- - -- - - -- MW-23D 5/8/2013 6.65 548 348 3.82 365 8.21 12.38 130000 - -- -- -- -- < 5000 U < 50 U 42000 -- -- 31000 200000 -- < 1 U < 1 U 68 -- < 1 U < 5 U -- -- < 5 U 71 < 1 U 9170 61 < 0.05 U -- < 5 U - 1530 < 1 U 5510 -- -- < 5 U -- -- -- -- -- -- MW-23D 9/4/2013 6.78 356 156 -- 496 9.41 17.27 220000 -- - -- -- -- -- < 50 U 72100 -- -- 30000 280000 -- < 1 U < 1 U 112 -- < 1 U < 5 U -- -- < 5 U 211 < 1 U 14100 566 < 0.05 U -- < 5 U -- 1620 < 1 U 7290 -- -- < 5 U -- -- -- -- -- -- MW-23D 1/13/2014 5.91 591 391 7.42 128 19.7 11.55 26000 -- -- .1 -- -- -- < 50 U 12800 -- -- 27000 100000 -- < 1 U < 1 U 29 -- < 1 U < 5 U -- -- < 5 U 969 < 1 U 4810 23 < 0.05 U -- < 5 U -- 1620 < 1 U 3240 - -- < 5 U -- - -- -- -- -- MW-23D 5/5/2014 6.75 449 249 6.69 430 89.5 14.05 200000 - -- -- -- -- -- < 50 U 65600 -- -- 31000 280000 -- < 1 U < 1 U 88 - < 1 U < 5 U - -- < 5 U 696 < 1 U 12600 117 < 0.05 U -- < 5 U -- 1390 < 1 U 5920 -- -- < 5 U -- - -- -- -- -- MW-23D 9/8/2014 5.76 489 289 5.59 157 24.4 17.29 34000 -- -- -- -- -- -- < 50 U 17700 -- -- 39000 120000 -- < 1 U < 1 U 48 -- < 1 U < 5 U -- -- < 5 U 1430 < 1 U 5330 45 < 0.05 U -- < 5 U -- 2700 < 1 U 3140 - - 6 -- - -- - -- -- MW-23D 1/5/2015 6.05 553 353 6.36 192 19.6 12.81 48000 -- -- -- - -- -- < 50 U 21300 -- -- 32000 300000 -- < 1 U < 1 U 53 -- < 1 U < 5 U -- -- < 5 U 852 < 1 U 6430 27 < 0.05 U -- < 5 U -- 1650 < 1 U 4430 - -- 7 -- - -- -- -- -- MW-23D 5/4/2015 6.84 430 230 8.86 425 22.7 12.99 131000 < 5000 U 131000 -- -- -- < 5000 U < 50 U 44200 -- -- 31000 180000 490 < 1 U < 1 U 74 < 1 U < 1 U < 5 U -- < 1 U < 5 U 404 < 1 U 9150 39 < 0.05 U < 1 U < 5 U -- 1210 < 1 U 5630 -- -- < 5 U -- -- - - -- MW-23D 6/30/2015 6.89 346.5 146.5 1.44 438.2 51.69 19.8 205000 < 5000 U 205000 1.83+ < 100 U 5201 < 2500 U < 50 U 61100 80001+ 740 29800 252000 180 < 0.5 U 0.273 80 < 0.2 U < 0.08 U 0.261+ 0.0893 0.251 0.88 J+ 110 0.057 J+ 13600 280 < 0.2 U 0.41 J 0.49 J+ < 20 UJ < 5000 U < 0.5 U 7300 < 0.1 U < 1 U 27 - - -- -- -- - MW -23D 12/15/2015 5.95 268.8 68.8 1.86 385.3 9.73 14.8 168000 < 5000 U 168000 55.5 < 100 U < 1000 U 3500 < 50 U 59000 5200 110 27700 279000 < 100 U < 0.5 U 0.33 J 16 < 0.2 U < 0.08 U 1.5 1.1 0.3 J 0.87 J 48 J 0.24 13000 25 < 0.2 U 0.12 J 1 36 < 5000 U < 0.5 U 6400 < 0.1 U 1.2 2.6 J - -- -- -- -- - MW -23D 3/29/2016 6 362.5 162.5 6.4 108.2 20.08 13.6 23100 < 5000 U 23100 1.63+ < 100 U 1100 < 2500 U < 50 U 11900 2700 70.9 20300 82000 579 < 0.5 U 0.251+ 21.7 0.074 J+ 0.0843+ 1.31+ 0.094 0.28 J+ 0.93 J+ 850 0.35 J+ 3920 10.2 < 0.2 U 0.14 J+ 0.9 < 20 U < 5000 U 0.383 28803 < 0.1 U 1.1 < 10 U 0.171 -0.655 < 0.5 U -- -- -- MW-23D 9/29/2016 6.1 395.1 195.1 4.2 226.3 8.5 19.1 76300 < 5000 U 76300 < 10 U < 100 U -- < 2500 U < 50 U 29000 5000 186 24700 82000 312 < 0.5 U 0.15 42 0.0273+ < 0.08 U 2.1 J+ 1.1 0.12 0.64 J+ 290 0.12 9410 15.2 < 0.2 U 0.14 J 1.4 50 < 5000 U < 0.5 U 6480 < 0.1 U 0.66 3.23+ -- -- < 0.5 U -- -- -- Valid Sample Count 17 17 17 16 14 14 14 14 30 15 16 16 14 14 16 16 14 16 16 16 14 16 16 10 14 16 16 16 16 16 16 14 16 13 16 16 16 14 14 16 4 4 6 0 0 0 Bedrock Flow Layer MW-23BR 6/1/2015 7.45 206 6 3.05 474.3 0.22 21.8 220000 < 10000 U 220000 < 10 UJ < 100 U 148 < 5000 U < 50 U 53700 3300 1940 12000 270000 8 1.21 6.36 136 < 1 U < 1 U < 1 U - < 1 U 8.46 138 < 1 U 18900 32 < 0.05 U 2.52 < 1 U -- 654 < 1 U 13200 0.55 1.38 7 -- -- -- -- -- -- MW-23BR 9/10/2015 7.5 348.2 148.2 0.07 715 4 21.6 203000J- < 5000 U 203000 55.7 180 < 1000 U < 2500 U 29 J 48500 3800 1900 8400 266000 < 100 U < 0.50 U 1.1 120 < 0.20 U < 0.080 U < 0.50 U -- < 0.50 U 1.2 1000 < 0.10 U 18900 29 < 0.20 UJ 1.6 < 0.50 U < 20 U < 5000 U < 0.50 U 15200 < 0.10 U < 1.0 U < IOU -- -- -- -- -- -- MW-23BR 12/15/2015 7.51 58.5 -141.5 0.38 452.5 1.2 12.4 233000J < 5000 U 233000 45.5 < 100 U 29000J < 2600 U < 50 U 54500 4100 1900 11000 276000 661 < 0.5 U 0.65 120 < 0.2 U < 0.08 U < 0.5 U 0.0141 < 0.5 U 0.273 12001 < 0.1 U 19400 30 < 0.2 U 1.1 0.47 J < 20 U < 5000 U < 0.5 U 14000 < 0.1 U 0.313 16 J+ -- -- -- -- -- -- MW-23BR 3/29/2016 7.4 86.2 -113.8 2.21 442.1 0.01 16 217000 < 5000 U 217000 41.3 < 100 U < 1000 U < 2600 U < 50 U 57100 4200 1710 11300 245000 < 100 U < 5 U 0.47 J+ 110 < 1 U < 0.8 U < 5 U < 0.03 U < 1 U < 5 U 1130 < 1 U 20100 25 < 0.2 U 1.33 < 5 U < 20 U < 5000 U < 5 U 13900 < 1 U < 3 U < 10 U 0.787 0.442 < 5 U -- -- -- MW-23BR 6/20/2016 7.5 14.9 -185.1 0.1 335.8 0.3 22.8 231000 < 5000 U 231000 105 < 100 U -- 3500 311 55500 3900 1960 10400 250000 < 100 U < 5 U 0.62 J 128 < 1 U < 0.8 U < 5 U < 0.03 U < 1 U 11.7 1010 1.4 19400 29.8 < 0.2 U 1.2 J < 5 U < 20 U < 5000 U < 5 U 15000 < 1 U 1.33 88.9 0.19 0.226 0.363 -- -- -- MW-23BR 9/28/2016 7.6 18.9 -181.1 0.15 449.3 3.2 21.6 236000 3200J 233000 118 < 100 U -- < 2500 U 30.81 59100 4700 1890 10000 284000 < 100 U 0.211+ 0.36 122 0.025 J+ < 0.08 U 0.46 J+ -- 0.0171+ 0.423+ 1230 < 0.1 U 20700 31.6 < 0.2 U 1.2 < 0.5 U < 20 U < 5000 U < 0.5 U 16000 < 0.1 U < 0.3 U 9.43+ -- -- < 5 U -- -- - Valid Sample Count 6 6 6 6 6 6 6 6 4 6 6 6 6 6 6 6 6 6 6 6 6 6 6 3 6 6 6 6 6 6 6 6 6 5 6 6 6 6 6 6 2 2 3 0 0 0 POTENTIAL BACKGROUND WELLS TO BE INCLUDED - JUSTIFICATION ATTACHED Shallow Flow Layer BG -10S 7/7/2016 -- -- -- -- -- -- -- 14600 < 5000 U 14600 < 10 U < 100 U -- < 2500 U < 50 U 3580 4200 37.3 2800 73000 371 0.161 0.15 41 0.11 < 0.08 U 2.9 < 0.03 U 0.41 < 0.5 U 384 0.22 1920 47.4 < 0.2 U < 0.5 U 2 480 < 5000 U 0.393 4560J < 0.1 U 0.76 < 10 U 0.179 0.509 < 0.5 U -- -- -- BG-5S 6/24/2015 6.14 458.9 258.9 3.43 251 5.23 20.4 77600 < 5000 U 77600 3.6 J+ < 100 U 5701 -- < 50 U 17100 6900 220 41300 175000 590 < 0.5 U 0.281 21 0.0873 < 0.08 U 2.6 -- 2.1 2J+ 890 1.7 11500 110 < 0.2 U 0.11 J 2.4 J+ 400 J+ < 5000 U < 0.5 U 16000 0.019 J 2.6 5.1 J+ 1.22 < 3 U 0.135 J < 0.05 U < 0.05 U < 0.05 U BG -5S 9/9/2015 6.2 402.6 202.6 1.1 272.3 5 16.6 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- BG-5S 9/9/2015 6.2 402.6 202.6 1.1 272.3 5 16.6 80800 < 5000 U 80800 1.4 J+ < 100 U < 1000 U 62900 < 50 U 21000 6700 240 38700 191000 720 < 0.50 U 0.29 J 22 < 0.20 U < 0.080 U 0.89 -- 0.91 0.45 J 1100 0.76 14000 120 < 0.20 U < 0.50 U 1.1 360 < 5000 U < 0.50 U 17900 < 0.10 U 0.821 5.1 J -- -- -- -- -- -- BG-5S 11/16/2015 6.2 358.3 158.3 0.88 256.4 3.07 16.1 75100 < 5000 U 75100 2.5 J+ < 100 U 25800 < 2500 U < 50 U 17600 6800 200 37600 151000 130 < 0.5 U < 0.5 U 12 < 0.2 U < 0.08 U 1 J+ 0.35 < 0.5 U < 1 U 140 0.14 11400 16 < 0.2 U < 0.5 U 0.59 440 < 5000 U < 0.5 U 16700 < 0.1 U 0.313 7.2 J+ -- -- -- -- -- -- BG-5S 12/15/2015 6.06 402.9 202.9 1.06 261 2.95 15.5 70600 < 5000 U 70600 2.31+ < 100 U 5503 < 2500 U < 50 U 17200 6900 200 36700 187000 < 100 U < 0.5 U < 0.5 U 11 < 0.2 U < 0.08 U 0.73 J+ 0.41 < 0.5 U < 1 U 27 J 0.05 J 11300 < 5 U < 0.2 U < 0.5 U 0.64 430 < 5000 U < 0.5 U 16300 < 0.1 U 0.33 < 10 U -- -- - -- -- -- BG-5S 3/28/2016 6.4 367.9 167.9 1.36 229.3 2.07 15.3 73600 < 5000 U 73600 1.5 J+ < 100 U < 1000 U < 2500 U < 50 U 16800 6700 206 33600 165000 118 < 0.5 U < 0.1 U 18.7 < 0.1 U < 0.08 U 0.81 J+ 0.45 0.0373 0.17 J 83.2 < 0.1 U 11400 < 5 U < 0.2 U < 0.5 U 0.66 460 < 5000 U < 0.5 U 17000 < 0.1 U 0.2 J 2.5 J 0.218 0.158 < 0.5 U -- -- -- BG-5S 6/21/2016 5.9 378.1 178.1 1.7 241.9 1.2 16.7 77900 < 5000 U 77900 < 10 U < 100 U -- < 2500 U < 50 U 19200 6500 204 33700 160000 69.91 < 0.5 U 0.053 11.8 0.038 J < 0.08 U 0.54 0.48 < 0.1 U 0.13 J 29.8 J < 0.1 U 12200 < 5 U < 0.2 U < 0.5 U 0.56 460 < 5000 U < 0.5 U 16800 < 0.1 U 0.22 J 2.5 J 0.235 0.106 < 0.5 U -- -- -- BG-5S 9/28/2016 5.9 342 142 1.4 249.4 4.3 19.3 77000 < 5000 U 77000 < 10 U < 100 U -- < 2500 U < 50 U 19500 7300 206 37500 204000 75.11+ 0.21+ < 0.1 U 11.7 0.073+ < 0.08 U 0.77 J+ 0.38 J+ 0.0513 0.593+ 79.2 < 0.1 U 12500 4.1 J < 0.2 U < 0.5 U 0.6 500 < 5000 U < 0.5 U 18600 < 0.1 U 0.163 22.3 J+ -- -- < 5 U - -- -- MW-20S 1/4/2011 5.98 -- -- -- 239.9 11 13.65 -- -- -- -- -- -- -- < 50 U -- -- -- 9400 140000 -- < 1 U < 1 U 19 -- < 1 U < 5 U -- -- < 5 U 2890 < 1 U -- 880 < 0.05 U -- < 5 U -- -- < 1 U -- -- -- < 5 U -- -- -- -- -- MW-20S 5/5/2011 6 -- -- -- 234.1 5.21 12.64 -- -- -- -- -- -- -- < 50 U -- -- -- 6100 150000 -- < 1 U < 1 U 16 -- < 1 U < 5 U -- -- < 5 U 3190 < 1 U -- 914 < 0.05 U -- < 5 U -- -- < 1 U -- -- -- < 5U -- -- -- -- -- -- MW-20S 9/7/2011 5.97 -- -- 228.9 10.9 15.4 -- -- -- -- -- -- < 50 U -- -- - 5900 140000 -- < 1 U 1.03 16 -- < 1 U < 5 U -- -- < 5 U 3070 < 1 U -- 889 < 0.05 U -- < 5 U -- -- < 1 U -- - -- < 5 U -- - -- - -- -- MW-20S 1/12/2012 6.24 415 215 0.08 223.7 2.2 14.15 -- -- -- -- -- -- -- < 50 U - -- -- 5800 160000 -- < 1 U 1.28 16 -- < 1 U < 5 U -- -- < 5 U 3100 < 1 U -- 894 < 0.05 U -- < 5 U -- -- < 1 U -- -- -- < 5 U -- -- -- -- -- -- MW-20S 5/7/2012 5.91 418 218 0.51 224 6.91 13.81 -- -- -- - -- -- -- < 50 U -- -- -- 5400 147000 -- 1.04 < 1 U 15 -- < 1 U < 5 U -- -- < 5 U 2960 < 1 U -- 945 < 0.05 U -- < 5 U -- -- < 1 U -- -- -- < 5 U -- -- -- -- -- -- MW-20S 9/4/2012 5.87 359 159 0.47 230 4.38 15.71 -- -- -- -- -- -- -- < 50 U -- -- -- 5400 150000 -- < 1 U < 1 U 16 -- < 1 U < 5 U -- -- < 5 U 3090 < 1 U -- 923 < 0.05 U -- < 5 U -- -- < 1 U -- -- -- < 5 U -- -- -- -- -- -- MW-20S 1/7/2013 5.98 512 312 0.44 219 2.28 14.12 70000 -- -- -- -- -- -- < 50 U 15100 -- -- 5200 130000 -- < 1 U < 1 U 15 -- < 1 U < 5 U -- -- < 5 U 2350 < 1 U 10700 864 < 0.05 U -- < 5 U -- 627 < 1 U 10300 -- -- < 5 U -- -- -- - -- -- MW-20S 5/7/2013 5.82 488 288 0.08 220 7.41 12.99 76000 -- -- -- -- -- < 5000 U < 50 U 15000 -- -- 5200 150000 -- < 1 U < 1 U 15 -- < 1 U < 5 U -- -- < 5 U 2570 < 1 U 10500 939 < 0.05 U -- < 5 U -- 546 < 1 U 9450 -- -- < 5 U -- -- -- -- -- -- MW-20S 9/4/2013 5.94 456 256 -- 223 7 15.16 75000 -- -- -- -- -- -- < 50 U 15700 -- -- 4900 140000 -- < 1 U < 1 U 16 -- < 1 U < 5 U -- -- < 5 U 2850 < 1 U 10900 908 < 0.05 U -- < 5 U -- 599 < 1 U 9930 -- - 5 -- -- -- -- -- -- MW-20S 1/13/2014 5.87 466 266 0.45 223 5.1 14.17 68000 -- -- -- -- -- -- < 50 U 15600 -- -- 5600 150000 -- < 1 U < 1 U 16 -- < 1 U < 5 U -- -- < 5 U 2580 < 1 U 10900 901 < 0.05 U -- < 5 U -- 601 < 1 U 10100 -- - < 5 U -- - -- -- -- -- MW-20S 5/5/2014 5.89 427 227 0.44 223 7.3 12.94 78000 - -- -- - -- -- < 50 U 15600 -- - 5600 150000 -- < 1 U < 1 U 15 - < 1 U < 5 U -- -- < 5 U 2460 < 1 U 10800 888 < 0.05 U -- < 5 U -- 553 < 1 U 9690 -- -- < 5U - -- -- -- -- -- MW-20S 9/8/2014 5.87 388 188 0.04 221 5.11 14.72 36000 -- - -- -- -- -- < 50 U 15200 -- - 5300 140000 -- < 1 U < 1 U 16 - < 1 U < 5 U - - < 5 U 2720 < 1 U 10700 874 < 0.05 U -- < 5 U - 560 < 1 U 9860 -- -- 7 -- -- -- -- -- - MW -20S 1/5/2015 6.13 457 257 0.53 212 7.07 14.06 38000 -- - -- -- -- -- < 50 U 14400 -- - 4800 130000 -- < 1 U < 1 U 15 -- < 1 U < 5 U - - < 5 U 2440 < 1 U 9970 828 < 0.05 U -- < 5 U - 549 < 1 U 9730 - -- 8 -- -- -- -- -- - MW -20S 5/4/2015 5.94 439 239 0.36 211 4.53 12.59 62800 < 5000 U 62800 - - -- 7000 < 50 U 13800 -- - 5000 130000 557 < 1 U < 1 U 18 < 1 U < 1 U < 5 U - 2.24 < 5 U 2480 < 1 U 9710 789 < 0.05 U < 1 U < 5 U - 577 < 1 U 10100 -- < 5 U -- -- - -- -- -- MW-20S 6/24/2015 5.88 311.7 111.7 0.92 177.9 7.27 15.5 68300 < 5000 U 68300 79.2 < 100 U 690J 3000 < 50 U 15300 20800 130 3800 121000 < 100 U < 0.5 U 0.63 13 < 0.2 U < 0.08 U 0.22 J - 2.1 < 1 U 2800 < 0.1 U 10500 820 < 0.2 U 0.18 J 0.87 < 20 U < 5000 U < 0.5 U 9640 < 0.1 U < 1 U 60 -- -- - -- -- -- Valid Sample Count (Including BG -5S, BG -SOS and MW -205 31 31 31 26 19 19 18 18 12 19 30 26 18 18 30 30 19 30 30 30 19 30 30 12 19 30 30 30 26 30 30 19 30 17 26 30 26 18 18 30 6 6 9 1 1 1 Dee Flow Layer BG -IOD 7/6/2016 5.7 379.4 179.4 1.7 69.8 10.2 21.8 29200 < 5000 U 29200 < 10 U < 100 U -- < 2500 U < 50 U 5180 3300 39.6 2500 101000 193 < 0.5 U 0.18 2.6 J 0.022 J < 0.08 U 0.64 0.17 0.15 < 0.5 U 155 0.1 2920 22.5 < 0.2 U < 0.5 U 0.6 340 < 5000 U < 0.5 U 5540 < 0.1 U 0.66 < 10 U 0 0.422 < 0.5 U -- -- -- BG-5D 6/23/2015 7.06 418.2 218.2 0.27 358 3.81 18.7 133000 < 5000 U 133000 5.4 J+ < 100 U 6203 2900 < 50 U 32400 5700 300 39400 214000 60 J < 0.5 U < 0.5 U 29 < 0.2 U < 0.08 U 0.383+ -- 1 < 1 U 240 0.078 J 17400 910 < 0.2 U 1.2 0.523+ 26 J+ 31703 < 0.5 U 15700 < 0.1 U < 1 U < IOU 0.897 1.46 1.13 < 0.05 U < 0.05 U < 0.05 U BG -5D 9/9/2015 7 147.6 -52.4 0.3 342.9 8.1 21.6 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- BG-5D 9/9/2015 7 147.6 -52.4 0.3 342.9 8.1 21.6 126000 < 5000 U 126000 < 10.0 UJ < 100 U < 1000 U 5200 < 50 U 30700 5400 280 34900 212000 220 < 0.50 U < 0.50 U 22 < 0.20 U < 0.080 U 0.47 J -- 0.41 J 0.36 J 510 0.27 16700 580 < 0.20 U 0.56 0.36 J 140 < 5000 U < 0.50 U 16400 < 0.10 U 0.463 < 10 U -- -- -- -- -- -- BG-5D 11/16/2015 6.64 254.9 54.9 0.28 315.2 1.05 16 115000 < 5000 U 115000 1.41+ < 100 U < 1000 U < 2500 U < 50 U 25600 6000 230 34500 164000 < 100 U < 0.5 U < 0.5 U 16 < 0.2 U < 0.08 U 0.48 J+ 0.024 J+ < 0.5 U < 1 U 81 0.083 14900 100 < 0.2 U 0.3 J 0.241 180 < 5000 U < 0.5 U 16500 < 0.1 U < 1 U 3.33+ -- -- -- -- -- -- BG-5D 12/15/2015 6.57 371.1 171.1 0.2 327.6 1.75 14.6 125000 < 5000 U 125000 2.3 J+ < 100 U 23800 < 2500 U < 50 U 28300 6000 250 34300 204000 < 100 U < 0.5 U < 0.5 U 16 < 0.2 U < 0.08 U 0.18 J+ 0.03 J < 0.5 U < 1 U < 50 U 0.0551 15900 130 < 0.2 U < 0.5 U < 0.5 U 120 < 5000 U < 0.5 U 16700 < 0.1 U < 1 U 6 J -- -- -- -- -- -- BG-5D 3/28/2016 6.6 394.3 194.3 0.97 287.1 0.35 17.1 116000 < 5000 U 116000 -- < 100 U < 1000 U < 2500 U < 50 U 25000 -- 248 -- 165000 < 100 U < 0.5 U < 0.1 U 16.5 < 0.1 U < 0.08 U 0.813+ -- 0.031 J < 0.5 U < 50 U < 0.1 U 14700 13.9 < 0.2 U 0.25 J < 0.5 U 240 < 5000 U < 0.5 U 17800 < 0.1 U 0.111 < 10 U 0.238 -0.341 0.43 -- - -- BG-5D 4/4/2016 8.5 361.5 161.5 5.01 403.2 2.57 16.9 -- -- -- 1.5 J+ -- -- -- -- -- 6200 -- 34100 -- - -- -- -- -- -- -- 0.072 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- - -- -- -- -- BG-5D 6/21/2016 6.5 368 168 0.5 301.1 3.2 16.6 117000 < 5000 U 117000 < 10 U < 100 U -- < 2500 U < 50 U 28500 5800 242 33100 180000 77.5 J < 0.5 U 0.0523 16.9 0.028 J < 0.08 U 0.22 J 0.07 0.03 J 0.89 83 < 0.1 U 16100 111 < 0.2 U 0.15 J < 0.5 U 220 < 5000 U < 0.5 U 17000 < 0.1 U 0.2 J < IOU 0.532 0.289 0.53 -- -- -- BG-5D 9/28/2016 6.4 244.6 44.6 0.4 304.5 3.7 19.7 120000 < 5000 U 120000 < 10 U < 100 U -- < 2500 U < 50 U 29400 6500 247 36700 232000 < 100 U < 0.5 U < 0.1 U 17.1 0.013+ < 0.08 U 0.453+ 0.13+ 0.0323 < 0.5 U 71.8 < 0.1 U 15500 91.7 < 0.2 U 0.17 J < 0.5 U 410 < 5000 U < 0.5 U 18800 < 0.1 U 0.17 J 2.93+ -- -- 0.55 -- -- -- GWA-18D 7/5/2016 -- -- -- -- -- -- -- 12000 < 5000 U 12000 < 10 U < 100 U -- < 2500 U < 50 U 1220 2400 22.5 < 1000 U 30000 96.1 J 0.65 < 0.1 U 17.5 0.23 < 0.08 U 15.4 0.38 3.5 1.8 234 < 0.1 U 1600 28 < 0.2 U 0.46 J 14.1 < 20 U < 5000 U < 0.5 U 3090J < 0.1 U 0.15 J 34.3 0.035 0.713 < 0.5 U -- -- -- MW-20D 1/4/2011 7.27 -- -- -- 325.6 4.16 13.52 -- -- -- -- -- -- -- < 50 U -- -- -- 6500 172000 -- < 1 U < 1 U 62 -- < 1 U < 5 U -- -- < 5 U 97 < 1 U -- 512 < 0.05 U -- < 5 U -- -- < 1 U -- -- -- < 5 U -- -- -- -- -- -- MW-20D 5/5/2011 7.44 - -- -- 327.7 2.04 13.76 -- -- -- -- -- -- -- < 50 U -- - -- 6100 210000 -- < 1 U < 1 U 64 -- < 1 U < 5 U -- -- < 5 U 78 < 1 U -- 510 < 0.05 U -- < 5 U -- -- < 1 U -- -- -- < 5 U -- -- -- -- -- -- MW-20D 9/7/2011 7.41 -- -- -- 323.4 8.07 14.58 -- - -- -- -- - -- < 50 U -- -- -- 6400 200000 -- < 1 U < 1 U 63 -- < 1 U < 5 U -- -- < 5 U 55 < 1 U -- 489 < 0.05 U -- < 5 U - -- < 1 U - -- -- < 5 U -- -- -- -- - -- MW-20D 1/12/2012 7.67 382 182 0.07 323.7 1.39 13.96 -- -- -- -- -- -- -- < 50 U -- -- -- 6400 210000 -- < 1 U < 1 U 66 -- 1.53 < 5 U -- -- < 5 U 59 12.5 -- 506 < 0.05 U -- < 5 U -- -- < 1 U -- -- -- < 5 U -- -- -- -- -- - MW -20D 5/7/2012 7.35 353 153 0 319 2.15 14.22 -- -- -- -- -- -- -- < 50 U -- -- -- 6400 283000 -- < 1 U < 1 U 64 -- < 1 U < 5 U -- -- < 5 U 41 < 1 U -- 510 < 0.05 U -- < 5 U -- -- < 1 U -- -- -- < 5U -- -- -- -- -- -- MW-20D 9/4/2012 7.32 305 105 0 325 0.63 14.52 -- -- -- -- -- -- -- < 50 U -- -- -- 6300 210000 - < 1 U < 1 U 66 -- < 1 U < 5 U -- -- < 5 U 23 < 1 U -- 519 < 0.05 U - < 5 U -- -- < 1 U -- -- - < 5 U -- -- -- -- -- -- MW-20D 1/7/2013 7.37 476 276 0.18 323 0.92 14.22 160000 -- -- -- -- -- -- < 50 U 42800 -- -- 6300 190000 -- < 1 U < 1 U 65 -- < 1 U < 5 U -- -- < 5 U 44 < 1 U 10800 513 < 0.05 U -- < 5 U -- 548 < 1 U 10100 -- -- < 5 U -- -- -- -- -- -- MW-20D 5/7/2013 7.31 416 216 0.05 324 2.7 14.12 170000 -- -- -- -- -- < 5000 U < 50 U 41600 -- -- 6400 200000 -- < 1 U < 1 U 64 -- < 1 U < 5 U -- - < 5 U 61 < 1 U 10400 503 < 0.05 U -- < 5 U -- 513 < 1 U 9740 -- -- < 5 U -- -- -- -- -- -- MW-20D 9/4/2013 7.42 388 188 - 324 3.06 14.38 160000 -- -- -- -- -- -- < 50 U 43700 -- -- 6100 200000 -- < 1 U < 1 U 66 -- < 1 U < 5 U -- -- < 5 U 40 < 1 U 10900 522 < 0.05 U -- < 5 U -- 546 < 1 U 10300 - -- < 5 U -- -- -- -- -- -- MW-20D 1/13/2014 7.32 404 204 0.18 325 1.64 14.11 160000 - -- -- - -- -- < 50 U 42800 - -- 6400 210000 -- < 1 U < 1 U 66 -- < 1 U < 5 U -- -- < 5 U 63 < 1 U 10600 528 < 0.05 U -- < 5 U -- 539 < 1 U 10200 -- -- < 5 U -- -- -- -- -- -- MW-20D 5/5/2014 7.29 386 186 0.19 325 3.6 14.25 160000 -- -- -- -- -- - < 50 U 43700 -- -- 6400 200000 -- < 1 U < 1 U 64 -- < 1 U < 5 U -- -- < 5 U 34 < 1 U 10400 511 < 0.05 U -- < 5 U -- 533 < 1 U 10000 -- -- < 5 U -- -- -- -- -- -- MW-20D 9/8/2014 7.31 359 159 0.08 323 2.72 14.26 22000 -- -- -- -- - -- < 50 U 44200 -- -- 6200 200000 -- < 1 U < 1 U 65 - < 1 U < 5 U -- -- < 5 U 43 < 1 U 10800 531 < 0.05 U -- < 5 U -- 529 < 1 U 10200 - -- < 5 U -- -- -- -- -- -- MW-20D 1/5/2015 7.58 395 195 0.15 324 2.99 14.02 23000 -- -- -- -- - -- < 50 U 43300 -- -- 6200 200000 - < 1 U 1.05 65 -- < 1 U < 5 U -- -- < 5 U 40 < 1 U 10600 524 < 0.05 U -- < 5 U -- 548 < 1 U 10200 -- < 5 U -- -- -- -- -- -- MW-20D 5/4/2015 7.45 370 170 0.13 325 0.35 14.03 161000 < 5000 U 161000 -- -- - < 5000 U < 50 U 40800 -- - 6300 200000 9 < 1 U < 1 U 68 < 1 U < 1 U < 5 U - < 1 U < 5 U 32 < 1 U 10400 501 < 0.05 U < 1 U < 5 U -- 517 < 1 U 10000 -- < 5 U - - - -- -- -- MW-20D 6/24/2015 7.44 222 22 0.49 322 9.67 16.8 158000 < 5000 U 158000 12.8 < 100 U < 1000 U 5500 351 43400 4200 520 5700 187000 130 < 0.5 U 0.91 66 < 0.2 U < 0.08 U 0.47 J - < 0.5 U < 1 U 200 0.094 J 11000 500 < 0.2 U 0.22 J 0.19 J 12 J < 5000 U < 0.5 U 10600 < 0.1 U 0.41 ] < 10 U) - - - -- -- -- Valid Sample Count (Including BG -5D, BG -10D, GWA-SSD and MW -20D 41 41 41 32 23 23 22 22 16 25 38 32 22 22 38 38 23 38 38 38 23 38 38 15 23 38 38 38 32 38 38 23 38 21 32 38 32 22 22 38 7 7 10 1 1 1 Bedrock Flow Layer BG-10BR 1 6/30/2016 1 - - - - - - - 142000 i < 5000 U 1 142000 1 < 10 U I < 100 U I - < 5000 U I < 50 U 1 36100 1 2900 1 196 1 2600 1 179000 1 336 1 0.28 J 1 0.57 1 23.8 1 0.03 ] I < 0.08 U 1 1.8 1 0.098 1 0.1 1 1.2 1 265 1 0.22 1 7340 1 38.8 1 < 0.2 U 1 0.63 1 1.1 1 74 1 < 5000 U I < 0.5 U 1 12100 1 < 0.1 U 1 2 1 6.2 J 1 0.281 1 0.707 1 2 1 - - -- Valid Sample Count Includin BG-SOBR 6 6 6 6 6 6 6 6 4 6 6 6 6 6 6 6 6 6 6 6 6 6 6 3 6 6 6 6 6 6 6 6 6 5 6 6 6 6 6 6 2 2 3 0 0 0 Notes: Red text indicates samples that will not be used in determining proposed provisional background threshold values (PPBTVs) due to pH > 8.5 or turbidity >10 NTU. 0 - Bold highlighted concentration indicates exceedance of the 15A NCAC 02L Standard or IMAC, Appendix 2, April 1, 2013. Nm = micron Ng/L = micrograms per liter NS/cm = microsiemens per centimeter ft = feet mg/L = milligrams per liter Eh values were calculated by adding 200 mV to the field -measured ORP value. Depending on the field meter used, Eh values calculated using this formula can vary by +/- 5 mV mV = millivolts NTU - nephelometric turbidity units pCi/L = picocuries per liter SU = standard unit J = laboratory estimated concentration J- = estimated concentration, biased low J+ = estimated concentration, biased high U = results not detected at concentrations which equal the laboratory's method reporting limit 02L = North Carolina groundwater standards as specified in T15A NCAC 02L D = dissolved Deg C = degree Celsius DHHS = North Carolina Department of Health and Human Services DO = dissolved oxygen GW = groundwater GWQS = groundwater quality standard IMAC = Interim Maximum Allow Concentration N = normal NS = no standard PPBC = Proposed Provisional Background Concentrations T = total TDS = total dissolved solids TOC = total organic carbon * BG -1D is scheduled for replacement due to potential grout contamination