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HomeMy WebLinkAboutDRC-2014-007085 - 0901a068804c2a11DIVISION OF RADIATION CONTROL Rusty Lundberg Director Department of Environmental Quality Amanda Smith Executive Director GARY R. HERBERT Governor SPENCER J. COX Lieutenant Governor DRC-2014-007085 MEMORANDUM FROM: TO: Dean Henderson Phil Goble P26 DATE: August 27, 2014 SUBJECT: Review of the 1st Quarter 2014 Chloroform Monitoring Report for the Chloroform Contamination Investigation, Energy Fuels Resources (USA) Inc. ("EFR") White Mesa Uranium Mill, near Blanding, Utah The Utah Division of Radiation Control ("DRC") has reviewed the May 19, 2014, 1st Quarter 2014 Chloroform Monitoring Report ("Report") for the Chloroform Contamination Investigation. For the review of this report the following regulatory enforcement documents were used: • EFR was issued Ground Water Quality Discharge Permit No. UGW370004 ("Permit") on March 8, 2005; last revised on June 8, 2013. • The EFR Quality Assurance Plan ("QAP") June 7,2012 (Revision. 7.2) REVIEW Monitor Well Sampling The following monitor wells were sampled as required in the QAP (see Table 1 below): MW-4 TW4-7 TW4-18 TW4-27 MW-26 TW4-8 TW4-19 TW4-28 MW-32 TW4-9 TW4-20 TW4-29 TW4-1 TW4-10 TW4-21 TW4-30 TW4-2 TW4-11 TW4-22 TW4-31 TW4-3 TW4-12 TW4-23 TW4-32 TW4-4 TW4-13 TW4-24 TW4-33 TW4-5 TW4-14 TW4-25 TW4-34 TW4-6 TW4-16 TW4-26 195 North 1950 West • Salt Lake City, UT Mailing Address: P.O. Box 144850 • Salt Lake City, UT 84114-4850 Telephone (801) 536-4250 • Fax (801-533-4097 • T.D.D. (801) 536-4414 www.deq.utah.gov Printed on 100% recycled paper Page 2 The following monitoring wells were purged using the three approved QAP well purging strategies and meet QAP requirements for each strategy: 1. Purging two casing volumes with stable field parameters for specific conductivity, turbidity, pH, redox potential, and water temperature (within 10% RPD): Wells: MW-32, TW4-1, TW4-5, TW4-8, TW4-9, TW4-11, TW4-12, TW4-16, TW4-18, TW4-21, TW4-23, TW4-28, and TW4-32. 2. Purging a well to dryness and stability of field parameters for pH, specific conductivity, and water temperature only after recovery: Wells: TW4-2, TW4-3, TW4-6, TW4-7, TW4-10, TW4-13, TW4-14, TW4-26, TW4-27, TW4-29, TW4-30, TW4-31, TW4-33, and TW4-34. 3. Pumping Wells: MW-4, MW-26, TW4-4, TW4-19, TW4-20, TW4-22, TW4-24, and TW4-25. The water samples for the above wells were analyzed for the following constituents as required in the QAP: Chloroform, Chloromethane, Carbon tetrachloride, Methylene chloride, Chloride and Nitrate + Nitrite as Nitrogen. Use of analytical methods is consistent with the requirements of the QAP requirements. QAQC Holding Times The method holding times for each parameter for samples collected at each monitor well were received and analyzed within the required holding times in the QAP. Receipt Temperature All samples were received within the required QAP temperature limit of 6° C. Detection Limits All analytes were measured and reported to the required reporting limits. However, several sets of sample results had the reporting limit raised for at least one analyte due to matrix interference and/or sample dilution. In all cases the reported value for the analyte was higher than the increased detection limit. Sample Duplicates Two duplicate samples were collected. Well TW4-28 and its duplicate sample TW4-65 and MW- 32 and its duplicate sample TW4-70. All analytical results for the two sample/duplicate pairs were within the 20% acceptance limits as required in the QAP (see Table 2 below). Page 3 Groundwater Head Monitoring Depth to groundwater was measured in the following wells and/or piezometers, as required in Part I.E.3 ofthe Permit: • The quarterly groundwater compliance monitoring wells. • Existing monitoring well MW-4 and all of the temporary chloroform investigation wells. • Piezometers P-l, P-2, P-3, P-4 and P-5. • MW-20 and MW-22. • Nitrate monitoring wells. • The DR piezometers which were installed during the Southwest Hydrologic Investigation. In addition, weekly and monthly depth to groundwater measurements were taken in MW-4, MW- 26, TW4-4, TW4-19, TW4-20, TW4-22, TW4-24, and TW4-25 and TWN-2. Mass Removed Chloroform removal was first estimated from the first quarter 2007. Since that estimation the mass removed by each pumping well for each quarter has been calculated. Estimated reported mass removed in 1st quarter 2014 is 8.65 lbs. Table 3 below verifies this estimate. Reporting The Report included the following information as required in the QAP: a) Introduction b) Sampling and Monitoring Plan -Description of monitor wells -Description of sampling methodology, equipment and decontamination procedures -Identify all quality assurance samples, e.g. trip blanks, equipment blanks, duplicate samples c) Data Interpretation -Interpretation of groundwater levels, gradients, and flow directions. Interpretations will include a discussion on: 1) A current site groundwater contour map, 2) hydrographs to show groundwater elevation in each monitor well over time, 3) depth to groundwater measured and groundwater elevation from each monitor well summarized in a data table, that includes historic groundwater level data for each well, and 4) an evaluation of the effectiveness of hydraulic capture of all contaminants of concern. -Interpretation of all analytical results for each well, including a discussion on: 1) a current chloroform isoconcentration map with one of the isoconcentration lines showing the 70 pg/L boundary, 2) graphs showing chloroform concentration trends in each well through time and, 3) analytical results for each well summarized in a data table, that includes historic analytical results for each well. -Calculate chloroform mass removed by pumping wells. Calculations Page 4 would include: 1) total historic chloroform mass removed, 2) total historic chloroform mass removed for each pumping well, 3) total chloroform mass removed for the quarter and, 4) total chloroform mass removed from each pumping well for the quarter. d) Conclusions and Recommendations e) Electronic copy of all laboratory results for Chloroform Investigation monitoring conducted during the quarter. f) Copies of DUSA field records, laboratory reports and chain of custody forms. Evaluation of the Chloroform Contaminate Plume and Its Associated Contaminants Bounding Chloroform Plume Groundwater monitoring data for the 1st quarter 2014 monitoring event appeared to show that the chloroform contaminate plume and associated contaminants, carbon tetrachloride, chloromethane, and methylene chloride is bound by up gradient, cross gradient, and down gradient wells that have a chloroform concentration of <70 pg/L (GWQS = 70 pg/L) except at monitor well locations TW4-8, TW4-24, and TW4-29. TW4-8: For the first time monitor well TW4-8 had a chloroform concentration of 100 pg/L exceeding the chloroform GWQS. EFR has installed a new monitor well (TW4-36) east of TW4-8 between TW4-13 and TW4-14 to better define the chloroform plume in the vicinity of TW4-8. TW4-36 will be sampled in the 2nd quarter 2014 monitoring event. Based on the chloroform sample results and groundwater head measurements at TW4-36, it will then be determined if additional well(s) are needed to bound the plume at this location. TW4-24: For the first time monitor well TW4-24 had a chloroform concentration of 78.5 pg/L exceeding the chloroform GWQS. TW4-24 is a pumping well for the nitrate plume corrective action plan. The likely chloroform concentration increase is due to the pumping of this well pulling the chloroform from the west where chloroform concentrations at TW4-22, approximately 500 feet to the west, are 12,100 pg/L, respectively. TW4-24 was a well that bounded the chloroform plume to the east. Because TW4-24 is a pumping well and its located next to tailing cell 1 (to the east) and tailing cell 2 (to the south) at this time no other new monitoring wells are recommended to be installed. TW4-29: EFR has installed a new monitor well (TW4-35) east of TW4-34 and south of TW4-30 to better define the chloroform plume in the vicinity of TW4-29. TW4-35 with be sampled in the 2nd quarter 2014 monitoring event. Based on the chloroform sample results and groundwater head measurements at TW4-35, it will then be determined if the additional well(s) are needed to bound the plume at this location. Page 5 Monitor Wells Exceeding Chloroform Concentrations of 70pg/L(GWQS) Nine monitor wells: TW4-1, TW4-2, TW4-7, TW4-10, TW4-1, and TW4-33 show a decrease for chloroform, while TW4-21 and TW4-29 have increased chloroform concentrations since the 4th quarter 2013. For the first time TW4-8 had chloroform concentrations above GWQS. Monitor Wells with Chloroform Concentrations between 1 pg/L and 70pg/L Five monitor wells: TW4-5, TW4-6, TW4-16, TW4-18, and TW4-26 chloroform concentrations of <70pg/L. TW4-18 appears to have a increasing trend. Pumping Wells Chloroform Concentrations Pumping wells MW-4, MW-26, TW4-4, TW4-19, TW4-20, and TW4-22 exceed chloroform concentrations of 70pg/L. Pumping well TW4-24 had a historic high chloroform concentration of 78.5 pg/L and TW4-25 have non-detectable chloroform concentrations (<1.0 pg/L). Monitor Wells Below the Laboratory Chloroform Detection Limit (<1.0 pg/L) The following monitor wells are below laboratory detection limit for chloroform (<1.0 pg/L): MW-32, TW4-3, TW4-9, TW4-12, TW4-13, TW4-14, TW4-23, TW4-27, TW4-28, TW4-30, TW4-31, TW4-32 and TW4-34. Nitrate, Nitrate + Nitrite ("nitrate") Concentrations Monitor wells TW4-21, TW4-22, TW4-24, and TW4-25 all exceed the nitrate GWQS of 10 mg/l. All of these nitrate exceedances for these wells appear to be a result of the nitrate contaminant plume up-gradient of the chloroform contaminant plume. This nitrate contaminant plume is being addressed under the Nitrate Corrective Action Plan, approved on December 12, 2012. Nitrate concentrations in TW4-12, TW4-26, TW4-27 continue to exceed the GWQS (10 mg/L) and have wells downgradient to with nitrate concentrations <1.0 mg/L. At this time, no further action, other than continued quarterly sampling, is recommend. Conclusions on Compliance with the Permit and QAP Per the DRC review it appears that the Report complies with Permit and QAP. Therefore a letter will be drafted for the Director Signature, notifying EFR of the review and closing out of the 1st Quarter 2014 Chloroform Monitoring Report for the chloroform contamination investigation. Page 6 References Energy Fuels Resources (USA) Inc., June 7, 2012 White Mesa Uranium Mill, Ground Water Monitoring Quality Assurance Plan (Revision 7.2). Energy Fuels Resources (USA) Inc., May 19, 2014 White Mesa Uranium Mill Chloroform Monitoring Report 1st Quarter 2014 (January through March 2014). Hydro Geo Chem, Inc., January 23, 2014, Contamination Investigation Report TW4-12 and TW4- 27 Areas White Mesa Mesa Uranium Mill Near Blanding Utah. State of Utah Division of Water Quality Department of Environmental Quality, June 8, 2013, Ground Water Discharge Permit for Denison Mines (USA) Corp. at the White Mesa Mill Facility Near Blanding, Utah. State of Utah Division of Water Quality Department of Environmental Quality, August 23, 1999, White Mesa Uranium Mill: Notice of Violation and Groundwater Corrective Action Order, Docket No UGW-20-01. TABLE 1 (1 of 27) Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2014 Chloroform Contamination Investigation DUSA White Mesa Mill Well Sampling Event Parameter GWQS Carbon Tetrachloride (5 ug/L) Chloride No GWQS (mg/L) Chloroform (70 MQ/L) Chloromethane (30 M/L) Methylene Chloride (5 Mg/L) Nitrate, Nitrate + Nitrite (10 mg/L) MW-4 (chloroform pumping well) 1st Qtr 3/16/05 2nd Qtr 5/25/05 3rd Qtr 8/31/05 4th Qtr 12/7/05 1st Qtr 3/9/06 2nd Qtr 6/14/06 3rd Qtr 7/20/06 4th Qtr 11/8/06 1st Qtr 2/28/07 2nd Qtr 6/27/07 3rd Qtr 8/15/07 4th Qtr 10/10/07 1st Qtr 3/28/08 2nd Qtr 6/25/08 3rd Qtr 9/10/08 4th Qtr 10/15/08 1st Qtr 3/4/09 2nd Qtr 6/23/09 3rd Qtr 9/14/09 4th Qtr 12/14/09 1st Qtr 2/17/10 2nd Qtr 6/14/10 3rd Qtr 8/6/10 4th Qtr 10/15/10 1st Qtr 2/23/11 2nd Qtr 6/1/11 3rd Qtr 8/17/11 4th Qtr 11/16/11 1st Qtr 1/23/12 2nd Qtr 6/6/12 3rd Qtr 9/4/12 4th Qtr 10/4/12 1stQtr2/11/13 " 2nd Qtr 6/5/13 3rd Qtr 9/3/13 4th Qtr 10/29/13 1st Qtr 1/27/14 NA NA <10 <50 <50 <50 <50 2 1 1 6 1 8 1 9 1 7 1 7 1 8 1 8 1 7 1 5 1 3 1 4 1 6 1 2 1 2 1 5 1 4 1 5 1 4 1 1 1 3 1 1 2 1 5 1 1 48 1 31 1 13 5.58 NA NA NA 4 15 53 49 49 48 50 47 45 47 45 42 42 35 45 37 34 43 44 45 41 38 41 40 35 41 40 41 39 41 41 37 8 44 41 4 40 1 38 5 2,900 3,170 3,500 3,000 3,100 3,000 2,820 _2,830 2,300 2,000 2,600 , 2,300 2,400 2,500 1,800 2,100 2,200 1,800 2,000 1,800 1,600 2,100 1,900 JJOO 1,700 1,700 1,700 1,600 1,500 1,400 1,500 JL30P 1,670 1,490 1,520 1,410 1,390 NA NA <10 <50 <50 <50 <50 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 1 4 NA NA <10 <50 <50 <50 <50 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 6 3 7 1 70 70 60 6 0 1 2 64 63 70 62 62 5 8 6 1 64 59 57 52 5 3 58 40 5 1 4 8 4 9 4 6 49 4 9 5 1 4 8 49 50 48 4 8 42 49 53 47 MW-4A(TW4-A) 1st Qtr 3/16/05 2nd Qtr 5/25/05 3rd Qtr 8/31/05 4th Qtr 12/7/05 1st Qtr 3/9/06 2nd Qtr 6/14/06 3rd Qtr 7/20/05 4th Qtr 11/8/05 1st Qtr 2/28/07 NA NA <W <50 <50 <50 <SO NA NA NA 24 1 9 3,700 3.740 3,800 3,000 3,700 -„ 3,300 3.190 3,370 NA NA <10 <50 <50 <50 <50 <1 0 <1 0 Weil abandonded NA NA <10 <50 <50 <50 <50 <1 0 <1 0 7 1 7 8 6 9 67 58 73 1 2 7 1 "7 1 NA = not analyzed Shaded indicates concentrations exceeding GWQS Bold and italics indicates the MDL exceeded the GWQS TABLE 1 (2 of 27) Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2014 Chloroform Contamination Investigation DUSA White Mesa Mill Well Sampling Event Parameter GWQS Carbon Tetrachloride (5 pg/L) Chloride No GWQS (mg/L) Chloroform Chloromethane Methylene Chloride Nitrate, Nitrate + Nitrite (70 pg/L) (3Q pg/u (5 pg/L) (10 mg/L) MW-26 (former TW4-15) Chloroform pumping well 1st Qtr 3/16/05 2nd Qtr 5/25/05 3rd Qtr 8/31/05 4th Qtr 12/7/05 1st Qtr 3/9/06 2nd Qtr 6/14/06 3rd Qtr 7/20/06 4th Qtr 11/8/06 1st Qtr 2/28/07 2nd Qtr 6/27/07 3rd Qtr 8/15/07 4th Qtr 10/10/07 1st Qtr 3/28/08 2nd Qtr 6/25/08 3rd Qtr 9/10/08 4th Qtr 10/15/08 11/18/08 1st Qtr 3/4/09 2nd Qtr 6/23/09 3rd Qtr 9/14/09 4th Qtr 12/14/09 1st Qtr 2/17/10 2nd Qtr 6/14/10 3rd Qtr 8/16/10 4th Qtr 10/15/10 1st Qtr 2/23/11 2nd Qtr 5/31/11 3rd Qtr 8/17/11 4th Qtr 11/16/11 (1l12/5/11 1st Qtr 2/7/12 2nd Qtr 6/6/12 3rd Qtr 9/4/12 4th Qtr 10/4/12 1st Qtr 2/11/13 2nd Qtr 6/5/13 3rd Qtr 9/3/13 4th Qtr 10/29/13 1st Qtr 1/27/14 NA NA <5 0 <50 <50 <50 <50 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 <1 <1 <1 0 <1 0 <1 0 <1 0 NA NA NA NA 1 2 55 52 52 65 54 56 49 57 57 49 57 44 64 49 48 46 60 57 40 49 65 57 88 58 69 NA 98 73 73 68 81 9 77 9 60 5 72 3 59 4 NA 310 442 960 1,000 1,100 830 2,170 * 282 570 300 1,400 2,000 930 1,300 630 1,700 950 410 850 "L100 . 730 1,600 2,200 970 450 1,800 720 NA 1,800 2,400 3,000 3,100 1,200 2,120 4,030 2,940 1,410 1,400 NA NA 54 <50 <50 <50 <50 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 <1 <1 <1 0 <1 0 <1 <1 0 NA NA <5 0 <50 <50 <50 <50 NA <1 0 26 5.5 13 36 14 40 53 24 100 51 .12 30 40 19 21 6.5 36 1 3 7.2 NA 29 16 21 31 4 9.34 52.4 33.2 4 03 NA 13.8 03 02 02 03 02 02 1 4 03 06 04 1 06 0 1 06 02 0 1 04 02 0 1 23 02 68 0 6 07 0 5 04 09 20 NA 1 7 25 26 1 8 2 3 2 1 1 2 1 4t 0 5 (1) VOCs were resampled because laboratory missed holding time NA = not analyzed Shaded indicates concentrations exceeding GWQS Bold and italics indicates the MDL exceeded the GWQS TABLE 1 (3 of 27) Historic Summary Of Monitoring Parameters Up To Thelst Quarter 2014 Chloroform Contamination Investigation DUSA White Mesa Mill Well Sampling Event Parameter GWQS Carbon Tetrachloride (5 ug/L) Chloride No GWQS (mg/L) Chloroform (70 ug/L) Chloromethane oo "g"-) Methylene Chloride Nitrate, Nitrate + Nitrite (10 mg/L) MW-32 dormer TOM 17) 1st Qtr 3/16/05 2nd Qtr 5/25/05 3rd Qtr 8/31/05 4th Qtr 12/7/05 1st Qtr 3/9/06 2nd Qtr 6/14/06 3rd Qtr 7/20/06 4th Qtr 11/8/06 1st Qtr 2/28/07 2nd Qtr 6/27/07 3rd Qtr 8/15/07 4th Qtr 10/10/07 1st Qtr 3/28/08 2nd Qtr 6/25/08 3rd Qtr 9/10/08 4th Qtr 10/15/08 1st Qtr 3/4/09 2nd Qtr 6/23/09 3rd Qtr 9/14/09 4th Qtr 12/16/09 1st Qtr 2/17/10 2nd Qtr 6/14/10 3rd Qtr 8/16/10 4th Qtr 10/15/10 1st Qtr 2/23/11 2nd Qtr 5/25/11 3rd Qtr 8/16/11 4th Qtr 11/16/11 ,1,12/7/11 1st Qtr 1/18/12 2nd Qtr 6/22/12 3rd Qtr 9/5/12 4th Qtr 10/10/12 1st Qtr 2/11/13 2nd Qtr 6/18/13 3rd Qtr 9/3/13 4th Qtr 10/29/13 1st Qtr 1/29/14 NA NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 ' <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA NA NA NA 33 32 30 32 31 32 32 31 32 31 29 30 26 30 31 33 35 38 32 28 24 40 31 33 32 21 32 33 35 34 3 34 9 33 35 7 34 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 32 3 5 1 8 1 5 NA NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <0 1 <0 1 <0 1 <0 1 <0 1 <0 1 <1 0 < 1 <1 0 <1 0 <1 0 <1 0 < 1 <1 0 <1 0 <0 05 < 1 <0 1 <0 1 <0 1 <0 1 <0 1 <0 1 <0 1 <0 1 <0 1 <0 1 <0 1 NA <0 1 <0 1 <0 1 <0 1 <0 1 <0 1 <0 1 <0 1 <0 1 (1) VOCs were resampled because laboratory missed holding time NA = not analyzed Shaded indicates concentrations exceeding GWQS TABLE 1 (4 of 27) Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2014 Chloroform Contamination Investigation DUSA White Mesa Mill Well Sampling Event Parameter GWQS Carbon Tetrachloride (5 ug/L) Chloride No GWQS (mg/L) Chloroform (70 pg/L) Chloromethane (30 pg/L) Methylene Chloride (5 pg/L) Nitrate, Nitrate + Nitrite (10 mg/L) TW4-1 1st Qtr 3/16/05 2nd Qtr 5/25/05 3rd Qtr 8/31/05 4th Qtr 12/7/05 1st Qtr 3/9/06 2nd Qtr 6/14/06 3rd Qtr 7/20/06 4th Qtr 11/8/06 1st Qtr 2/28/07 2nd Qtr 6/27/07 3rd Qtr 8/15/07 4th Qtr 10/10/07 1st Qtr 3/28/08 2nd Qtr 6/25/08 3rd Qtr 9/10/08 4th Qtr 10/15/08 1st Qtr 3/11/09 2nd Qtr 6/23/09 3rd Qtr 9/14/09 4th Qtr 12/29/09 1st Qtr 3/3/10 2nd Qtr 6/14/10 3rd Qtr 8/18/10 4th Qtr 10/15/10 1st Qtr 2/24/11 2nd Qtr 6/1/11 3rd Qtr 8/18/11 4th Qtr 11/29/11 1st Qtr 1/24/12 2nd Qtr 6/14/12 3rd Qtr 9/28/12 4th Qtr 10/4/12 1st Qtr 2/13/13 2nd Qtr 6/19/13 3rd Qtr 9/3/13 4th Qtr 11/14/13 1st Qtr 2/5/14 NA NA <10 <50 <50 <50 <50 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 1 4 1 2 1 4 1 3 1 3 1 3 1 1 1 3 1 3 1 1 1 1 2 1 3 66 NA NA NA 5.47 52 49 48 51 47 47 45 43 43 39 39 35 41 37 37 36 41 35 40 35 40 41 35 36 40 38 42 39 40 37 6 39 1 37 6 36 5 38 9 2,700 3,080 2,900 2,400 2,700 2,200 2,840 2,260 1,900 1,900 : 2,300 2,000 • 2,000 1,900 1,700 1,700 1,700 1,500 1,700 1,400 1,300 1,600 1,600 JL§00 1,300 1,200 1,300 1,500 1,300 1,000 1,000 1,100 1,320 1,100 1,150 1,280 1,090 NA NA <10 <50 <50 <50 <50 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA NA <10 <50 <SO <50 <50 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 9 1 10.6 98 97 94 96 92 89 9 84 78 76 8 68 8 15 93 7 5 69 7 3 68 7 1 68 67 66 6 6 66 68 66 68 7 1 50 65 70 69 7 1 7 1 77 NA = not analyzed Shaded indicates concentrations exceeding GWQS Bold and italics indicates the MDL exceeded the GWQS TABLE 1 (5 of 27) Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2014 Chloroform Contamination Investigation DUSA White Mesa Mill Well Sampling Event Parameter GWQS Carbon Tetrachloride (5 pg/L) Chloride No GWQS (mg/L) Chloroform (70 pg/L) Chloromethane (30 pg/L) Methylene Chloride (5 pg/L) Nitrate, Nitrate + Nitrite (10 mg/L) TW4-2 1st Qtr 3/16/05 2nd Qtr 5/25/05 3rd Qtr 8/31/05 4th Qtr 12/7/05 1st Qtr 3/9/06 2nd Qtr 6/14/06 3rd Qtr 7/20/06 4th Qtr 11/8/06 1st Qtr 2/28/07 2nd Qtr 6/27/07 3rd Qtr 8/15/07 4th Qtr 10/10/07 1st Qtr 3/28/08 2nd Qtr 6/25/08 3rd Qtr 9/10/08 4th Qtr 10/15/08 11/18/08 1st Qtr 3/11/09 2nd Qtr 6/23/09 3rd Qtr 9/14/09 4th Qtr 12/29/09 1st Qtr 3/3/10 2nd Qtr 6/14/10 3rd Qtr 8/18/10 4th Qtr 10/15/10 1st Qtr 2/24/11 2nd Qtr 6/2/11 3rd Qtr 8/17/11 4th Qtr 11/29/11 1st Qtr 1/24/12 2nd Qtr 6/14/12 3rd Qtr 9/28/12 4th Qtr 10/4/12 1st Qtr 2/13/13 2nd Qtr 6/19/13 3rd Qtr 9/3/13 4th Qtr 11/14/13 1st Qtr 2/6/14 NA NA <10 <50 <50 <50 <50 NA 2 3 1 8 2 5 22 2 1 23 22 24 24 22 2 2 2 2 26 2 5 2 1 24 22 1 6 28 2 2 1 1 8 2 5 17 2 65 241 3 15 7.1' NA NA NA NA 56 56 56 54 55 54 50 49 51 48 46 42 47 46 44 43 46 42 43 43 41 46 42 48 49 49 52 76 49 46 46 9 44 9 43 9 45 9 NA 3,700 3,750 3,900 3,500 3,800 3,200 4,120 3,420 2,300 3,000 340 (?) 3,200 i<3,300 ' 3,100 2,800 _3,200 3,100 2,800 3,000 1,600 2,600 3,300 3,300 -3.000 "3,160 3,000 2,400 3,900 2,500 2,500 2,900 3,100 3,580 3,110 3,480 3,740 3,180 NA NA <10 <50 <50 <50 <50 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA NA <10 <50 <50 <50 <50 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA 77 86 80 78 75 7 1 74 76 73 78 7 3 69 69 74 7 1 80 65 64 66 64 68 87 66 65 70 68 60 70 7 1 77 4 0 76 8 1 7 5 93 84 79 NA = not analyzed Shaded indicates concentrations exceeding GWQS Bold and italics indicates the MDL exceeded the GWQS TABLE 1 (6 of 27) Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2014 Chloroform Contamination Investigation DUSA White Mesa Mill Well Sampling Event Parameter GWQS Carbon Tetrachloride (5 ug/L) Chloride No GWQS (mg/L) Chloroform <7Q"g"-) Chloromethane (30 pg/L) Methylene Chloride (5 pg/L) Nitrate, Nitrate + Nitrite (10 mg/L) TW4-3 1st Qtr 3/16/05 2nd Qtr 5/25/05 3rd Qtr 8/31/05 4th Qtr 12/7/05 . 1st Qtr 3/9/06 2nd Qtr 6/14/06 3rd Qtr 7/20/06 4th Qtr 11/8/06 1st Qtr 2/28/07 2nd Qtr 6/27/07 3rd Qtr 8/15/07 4th Qtr 10/10/07 1st Qtr 3/28/08 2nd Qtr 6/25/08 3rd Qtr 9/10/08 4th Qtr 10/15/08 1st Qtr 3/4/09 2nd Qtr 6/23/09 3rd Qtr 9/14/09 4th Qtr 12/29/09 1st Qtr 2/23/10 2nd Qtr 6/14/10 3rd Qtr 8/10/10 4th Qtr 10/15/10 1st Qtr 2/15/11 2nd Qtr 5/25/11 3rd Qtr 8/16/11 4th Qtr 11/14/11 1st Qtr 1/17/12 2nd Qtr 5/31/12 3rd Qtr 8/29/12 4th Qtr 10/3/12 1st Qtr 2/7/13 2nd Qtr 6/29/13 3rd Qtr 9/3/13 4th Qtr 11/6/13 1st Qtr 1/22/14 NA NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA NA NA 26 26 26 26 23 22 23 24 27 21 19 19 22 21 20 21 22 23 24 22 26 23 23 23 23 21 24 25 25 23 7 23 8 25 24 1 24 9 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 64 23 1 6 22 NA NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 35 37 35 33 33 7 1 29 1 5 3 1 33 3 1 28 2 8 29 27 26 25 29 28 26 28 30 3 1 33 35 37 40 4 4 7 1 44 49 48 5 1 58 49 59 67 NA = not analyzed Shaded indicates concentrations exceeding GWQS TABLE 1 (7 of 27) Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2014 Chloroform Contamination Investigation DUSA White Mesa Mill Well Sampling Event Parameter GWQS Carbon Tetrachloride (5 ug/L) Chloride No GWQS (mg/L) Chloroform (70 pg/L) Chloromethane (3Q pg/L) Methylene Chloride (5 pg/M Nitrate, Nitrate + Nitrite (10 mq/L) TW4-4 (chlorofi pumping well) 1st Qtr 3/16/05 2nd Qtr 5/25/05 3rd Qtr 8/31/05 4th Qtr 12/7/05 1st Qtr 3/9/06 2nd Qtr 6/14/06 3rd Qtr 7/20/06 4th Qtr 11/8/06 1st Qtr 2/28/07 2nd Qtr 6/27/07 3rd Qtr 8/15/07 4th Qtr 10/10/07 1st Qtr 3/28/08 2nd Qtr 6/25/08 3rd Qtr 9/10/08 4th Qtr 10/15/08 4th Qtr 11/18/09 1st Qtr 3/4/09 2nd Qtr 6/23/09 3rd Qtr 9/14/09 4th Qtr 12/29/09 1st Qtr 2/17/10 2nd Qtr 6/14/10 3rd Qtr 8/10/10 4th Qtr 10/15/10 1st Qtr 2/23/11 2nd Qtr 6/1/11 3rd Qtr 8/17/11 4th Qtr 11/16/11 1st Qtr 1/23/12 2nd Qtr 6/6/12 3rd Qtr 9/4/12 4th Qtr 10/3/12 1st Qtr 2/11/13 2nd Qtr 6/29/13 3rd Qtr 9/3/13 4th Qtr 10/3/13 1st Qtr 1/27/14 NA NA <10 <50 <50 <50 <50 NA <2 0 <1 0 <1 0 <1 0 <1 0 1 7 1 5 1 7 1 5 1 5 1 6 1 5 1 4 1 2 1 2 1 1 1 1 1 1 2 1 3 1 3 1 4 1 2 1 2 1 ^' 1 2 _ 5.3 3 88 NA NA NA NA 54 51 48 50 49 49 47 45 47 43 42 39 44 37 34 39 41 48 35 36 38 41 35 40 39 38 43 39 38 39 39 6 38 8 43 9 37 4 3,100 2,400 3,200 j 2,800 :, • 2,900 "SB 2,600 'Cv 2,850 f 2,670 2,200 2.400 2,700 2,500 NA 2,800 2,500 2,200 2,500 2,200 1,800 2,000 950 1,700 1,700 2,100 1,700 1,800 \ 1,700 : 1.500 •1,500 1,200 1,500 1,600 1,400 1,460 1,330 1,380 1,360 1,260 NA NA <10 <50 <50 <S0 <50 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA NA <10 <50 <50 <50 <50 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA 100 11.3 99 10.2 9 5 86 97 10.1 90 94 95 9 5 92 10.8 88 10.1 10.2 82 84 76 66 76 7 3 7 1 70 70 66 70 7 1 7 1 7 1 70 74 6 3 72 78 7 3 NA = not analyzed Shaded indicates concentrations exceeding GWQS Bold and italics indicates the MDL exceeded the GWQS TABLE 1 (8 of 27) Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2014 Chloroform Contamination Investigation DUSA White Mesa Mill Well Sampling Event Parameter GWQS Carbon Tetrachloride Chloride No GWQS (mg/L) Chloroform i7Qpg/L) Chloromethane pg/u Methylene Chloride (5 pg/L) Nitrate, Nitrate + Nitrite (10 mg/L) TW4-5 1st Qtr 3/16/05 2nd Qtr 5/25/05 3rd Qtr 8/31/05 4th Qtr 12/7/05 1st Qtr 3/9/06 2nd Qtr 6/14/06 3rd Qtr 7/20/06 4th Qtr 11/8/06 1st Qtr 2/28/07 2nd Qtr 6/27/07 3rd Qtr 8/15/07 4th Qtr 10/10/07 1st Qtr 3/28/08 2nd Qtr 6/25/08 3rd Qtr 9/10/08 4th Qtr 10/15/08 1st Qtr 3/4/09 2nd Qtr 6/23/09 3rd Qtr 9/14/09 4th Qtr 12/29/09 1st Qtr 2/25/10 2nd Qtr 6/14/10 3rd Qtr 8/11/10 4th Qtr 10/15/10 1st Qtr 2/22/11 2nd Qtr 5/26/11 3rd Qtr 8/7/11 4th Qtr 11/16/11 11112/7/11 1st Qtr 1/18/12 2nd Qtr 6/6/12 3rd Qtr 9/11/12 4th Qtr 10/3/12 1st Qtr 2/13/13 2nd Qtr 6/13/13 3rd Qtr 9/5/13 4th Qtr 11/13/13 1st Qtr 1/30/14 NA NA <2 5 <2 5 <2 5 <2 5 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA NA NA NA 56 52 51 54 55 57 45 38 39 36 37 34 37 34 37 48 41 43 28 38 41 34 35 37 30 22 39 37 38 34 3 36 5 39 1 41 1 40 5 NA 120 . 113 82 63 66 51 53 7 47 1 35 26 92 94 11 9 3 11 10 12 13 12 85 13 12 12 11 10 9 10 79 76 84 12 8 10 8 11 2 11 6 14 4 12 5 NA NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <i"o" 58 25 3 1 3 1 NA NA <2 5 <2 5 <2 5 <2 5 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA 49 3 7: 60 60 60 59 67 29 7 8 70 77 82 74 87 79 93 7 9 75 8 3 7 5 68 7 1 70 72 70 72 75 6.0 58 80 8 1 77 82 10.7 78 78 9 2 (1) VOCs were resampled because laboratory missed holding time NA = not analyzed Shaded indicates concentrations exceeding GWQS TABLE 1 (9 of 27) Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2014 Chloroform Contamination Investigation DUSA White Mesa Mill Well Sampling Event Parameter GWQS Carbon Tetrachloride (5 U9/L) Chloride No GWQS (mg/L) Chloroform (7Q pg/u Chloromethane (3Q pg/L) Methylene Chloride (5 pg/u Nitrate, Nitrate + Nitrite (10 mg/L) TW4-6 1st Qtr 3/16/05 2nd Qtr 5/25/05 3rd Qtr 8/31/05 4th Qtr 12/7/05 1st Qtr 3/9/06 2nd Qtr 6/14/06 3rd Qtr 7/20/06 4th Qtr 11/8/06 1st Qtr 2/28/07 2nd Qtr 6/27/07 3rd Qtr 8/15/07 4th Qtr 10/10/07 1st Qtr 3/28/08 2nd Qtr 6/25/08 3rd Qtr 9/10/08 4th Qtr 10/15/08 1st Qtr 3/11/09 2nd Qtr 6/23/09 3rd Qtr 9/14/09 4th Qtr 12/29/09 1st Qtr 2/25/10 2nd Qtr 6/14/10 3rd Qtr 8/11/10 4th Qtr 10/15/10 1 st Qtr 2/23/11 2nd Qtr 5/26/11 3rd Qtr 8/17/11 4th Qtr 11/16/11 12/7/11 11/16/11 1st Qtr 1/18/12 2nd Qtr 6/13/12 3rd Qtr 9/11/12 4th Qtr 10/3/12 1st Qtr 2/13/13 2nd Qtr 6/13/13 3rd Qtr 9/5/13 4th Qtr 11/13/13 1st Qtr 1/29/14 NA NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA NA NA NA 32 31 30 37 65 32 38 36 35 33 35 35 33 35 37 37 41 45 33 31 41 40 42 39 36 33 38 40 21 41 40 4 37 9 40 6 40 2 40 6 <1 0 NA 2 5 10 17 31 19 11 42 8 46 11 18 18 52 24 39 37 81 120 280 250 1000 590 630 7 420 47 96 16 21 50 38 47 69 9 6 89 4 86 5 93 5 51 57 NA NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 28 1 3 NA NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 02 0 4 0 8 09 1 2 1 0 06 1 4 1 06 07 08 1 1 09 1 1 1 0 22 27 50 6 1 1 8 25 3 9 4 3 07 03 0 3 08 08 07 02 0 1 02 02 0 2 02 1 5 0 2, (1) VOCs were resampled because laboratory missed holding time (2) Results of the TW4-70 the duplicate sample for TW4-6 NA = not analyzed Shaded indicates concentrations exceeding GWQS TABLE 1 (10 of 27) Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2014 Chloroform Contamination Investigation DUSA White Mesa Mill Well Sampling Event Parameter GWQS Carbon Tetrachloride (5 pg/L) Chloride No GWQS (mg/L) Chloroform (70 pg/L) Chloromethane (3Q pg/M Methylene Chloride (5 pg/u Nitrate, Nitrate + Nitrite (10 mg/L) TW4-7 1st Qtr 3/16/05 2nd Qtr 5/25/05 3rd Qtr 8/31/05 4th Qtr 12/7/05 1st Qtr 3/9/06 2nd Qtr 6/14/06 3rd Qtr 7/20/06 4th Qtr 11/8/06 1st Qtr 2/28/07 2nd Qtr 6/27/07 3rd Qtr 8/15/07 4th Qtr 10/10/07 1st Qtr 3/28/08 2nd Qtr 6/25/08 3rd Qtr 9/10/08 4th Qtr 10/15/08 11/18/08 1st Qtr 3/11/09 2nd Qtr 6/23/09 3rd Qtr 9/14/09 4th Qtr 12/29/09 1st Qtr 3/3/10 2nd Qtr 6/14/10 3rd Qtr 8/11/10 4th Qtr 10/15/10 1st Qtr 2/23/11 2nd Qtr 6/1/11 3rd Qtr 8/18/11 4th Qtr 11/29/11 1st Qtr 1/19/12 2nd Qtr 6/14/12 3rd Qtr 9/13/12 4th Qtr 10/4/12 1st Qtr 2/13/13 2nd Qtr 6/18/13 3rd Qtr 9/12/13 4th Qtr 11/14/13 NA NA <10 <50 <50 <50 <50 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA NA NA 1 5 1 1 1 5 1 4 1 2 1 3 1 3 1 4 1 2 NA 1st Qtr 2/5/14 5.41 52 48 47 51 49 47 45 44 45 43 43 35 40 35 37 37 37 35 31 36 38 45 35 37 37 37 41 40 41 37 7 39 3 36 4 37 2 "382 NA 3,100 2,700 3,100 2.500 1,900 2,200 2,140 -2,160 1,830 2,600 2,300 1,900 2,200 1,800 1,600 2,500 1,800 1,400 1,500 1,300 1,200 1,100 1,500 1,100 1,300 1,200 1,200 1,000 1,000 790 870 940 940 953 1,040 1,050 946 NA NA <10 <50 <50 <50 <50 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <Tb""' NA NA <10 <50 <50 <50 <50 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <"i"b""" NA 52 54 52 5 3 1 4 5 47 46 6 5 1 47 47 42 4 8 4 16 4 01 37 3 8 4 1 4 2 3 8 39 39 4 3 6 4 0 4 1 3 8 39 40 38 38 35 4 0 4 2 4 1 4 2 NA = not analyzed Shaded indicates concentrations exceeding GWQS Bold and italics indicates the MDL exceeded the GWQS TABLE 1 (11 of 27) Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2014 Chloroform Contamination Investigation DUSA White Mesa Mill Well Sampling Event Parameter GWQS Carbon Tetrachloride (5 ug/L) Chloride No GWQS (mg/L) Chloroform <7Q"g/L) Chloromethane (3Q ng"-) Methylene Chloride (5 ug/n Nitrate, Nitrate + Nitrite (10 mg/L) TW4-8 1st Qtr 3/16/05 2nd Qtr 5/25/05 3rd Qtr 8/31/05 4th Qtr 12/7/05 1st Qtr 3/9/06 2nd Qtr 6/14/06 3rd Qtr 7/20/06 4th Qtr 11/8/06 1st Qtr 2/28/07 2nd Qtr 6/27/07 3rd Qtr 8/15/07 4th Qtr 10/10/07 1st Qtr 3/28/08 2nd Qtr 6/25/08 3rd Qtr 9/10/08 4th Qtr 10/15/08 1st Qtr 3/4/09 2nd Qtr 6/23/09 3rd Qtr 9/14/09 4th Qtr 12/17/09 1st Qtr 2/24/10 2nd Qtr 6/14/10 3rd Qtr 8/18/10 4th Qtr 10/15/10 1st Qtr 2/16/11 2nd Qtr 5/25/11 3rd Qtr 8/16/11 4th Qtr 11/16/11 m\2T7m 1st Qtr 1/18/12 2nd Qtr 5/13/12 3rd Qtr 8/29/12 4th Qtr 10/3/12 1st Qtr 2/7/13 2nd Qtr 5/30/13 3rd Qtr 9/5/13 4th Qtr 11/7/13 NA NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 1st Qtr 1/23/14 (2). 2/6/2014 <1 0 <1 0 NA NA NA NA 41 39 37 39 40 39 42 42 43 46 45 39 44 42 44 44 51 57 42 45 46 52 45 46 45 45 44 48 47 46 6 45 5 47 5 46 1 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 o" <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 48 5 46 5 10 1 1 1 3 1 8 25 2 5 1 5 35 63 8 10O.0 NA NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <i 6 <1 0 1 7 2 1 1 0 NA NA NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 " <1 0 <1 0 <1 0 <1 0 <1 0 <0 1 <1 0 <1 0 <1 0 < 1 <1 0 <1 0 <0 05 <0 05 <0 1 <0 1 <0 1 <0 1 <0 1 <0 1 <0 1 <0 1 NA <0 1 <0 1 <0 1 02 03 0 1 07 02 0 5 0 1 0 1 0 1 0 1 02 03 02 0 1 04 0 1 02 02 (1) VOCs were resampled because laboratory missed holding time (2) Resampled to venfy chloroform concentration that was collected on 1/23/14 NA = not analyzed Shaded indicates concentrations exceeding GWQS TABLE 1 (12 of 27) Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2014 Chloroform Contamination Investigation DUSA White Mesa Mill Well Sampling Event Parameter GWQS Carbon Tetrachloride (5 ug'L) Chloride No GWQS (mg/L) Chloroform <70Mg'L) Chloromethane 130 m"-) Methylene Chloride (5 ug'L) Nitrate, Nitrate + (10 mg/L) Nitrite TW4-9 1st Qtr 3/16/05 2nd Qtr 5/25/05 3rd Qtr 8/31/05 4th Qtr 12/7/05 1st Qtr 3/9/06 2nd Qtr 6/14/06 3rd Qtr 7/20/06 4th Qtr 11/8/06 1st Qtr 2/28/07 2nd Qtr 6/27/07 3rd Qtr 8/15/07 4th Qtr 10/10/07 1st Qtr 3/28/08 2nd Qtr 6/25/08 3rd Qtr 9/10/08 4th Qtr 10/15/08 1st Qtr 3/4/09 2nd Qtr 6/23/09 3rd Qtr 9/14/09 4th Qtr 12/17/09 1st Qtr 2/23/10 2nd Qtr 6/14/10 3rd Qtr 8/13/10 4th Qtr 10/15/10 1st Qtr 2/17/11 2nd Qtr 5/25/11 3rd Qtr 8/16/11 4th Qtr 11/16/11 [1) 12/7/11 1st Qtr 1/18/12 2nd Qtr 5/31/12 3rd Qtr 8/30/12 4th Qtr 10/3/12 1st Qtr 2/7/13 2nd Qtr 5/30/13 3rd Qtr 9/5/13 4th Qtr 11/7/13 1st Qtr 1/29/14 NA NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA NA NA NA 42 38 39 41 44 44 42 38 40 35 35 28 58 30 30 30 37 47 33 40 34 41 38 21 38 28 23 22 21 20 6 21 4 22 7 23 6 22 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 3 8 1 2 19 21 9 5 87 1 3 1 NA NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 o" <1 0 <1 0 <1 0 <1 0 <1 0 <10 <1 0 <1 0 29 26 27 NA NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 o" <1 0 <1 0 <1 0 <1 0 1 3 1 3 1 3 1 3 1 5 1 5 09 07 06 1 3 1 8 2 2 1 2 3 2 79 1 99 25 23 2 5 1 7 1 4 1 5 1 2 1 8 1 3 34 4 23 2 3 40 39 38 4 5 4 5 40 4 9 44 (1) VOCs were resampled because laboratory missed holding time NA = not analyzed Shaded indicates concentrations exceeding GWQS TABLE 1 (13 of 27) Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2014 Chloroform Contamination Investigation DUSA White Mesa Mill Well Sampling Event Parameter GWQS Carbon Tetrachloride (5 ug/L) No Chloride GWQS (mg/L) Chloroform (70 Pg/L) Chloromethane (30 pg/L) Methylene Chloride (5 pg/L) Nitrate, Nitrate + Nitrite (10 mg/L) TW4-10 1st Qtr 3/16/05 2nd Qtr 5/25/05 3rd Qtr 8/31/05 4th Qtr 12/7/05 1st Qtr 3/9/06 2nd Qtr 6/14/06 3rd Qtr 7/20/06 4th Qtr 11/8/06 1st Qtr 2/28/07 2nd Qtr 6/27/07 3rd Qtr 8/15/07 4th Qtr 10/10/07 1st Qtr 3/28/08 2nd Qtr 6/25/08 3rd Qtr 9/10/08 4th Qtr 10/15/08 11/18/08 1st Qtr 3/11/09 2nd Qtr 6/23/09 3rd Qtr 9/14/09 4th Qtr 12/22/09 1st Qtr 3/3/10 2nd Qtr 6/14/10 3rd Qtr 8/12/10 4th Qtr 10/15/10 1st Qtr 2/23/11 2nd Qtr 6/14/11 3rd Qtr 8/17/11 4th Qtr 11/16/11 1st Qtr 1/19/12 2nd Qtr 6/14/11 3rd Qtr 9/12/12 4th Qtr 10/3/12 1st Qtr 2/13/13 2nd Qtr 6/13/13 3rd Qtr 9/12/13 4th Qtr 11/14/13 1st Qtr 1/29/14 NA NA <2 5 <2 5 <5 0 <5 0 <5 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 5.16 NA NA NA NA 52 50 54 61 58 2 54 59 59 55 58 51 61 64 62 51 51 48 42 38 52 32 42 41 45 40 46 44 45 49 1 51 5 67 9 70 9 73 NA 140 62 110 •300 :190 300 504 452 500 350 - 660 470 620 720 660 1,200 1,100 1,200 910 300 460 220 100 1J00 620 .280 180 110 76 79 130 140 154 486 1,126 1,380 1,260 NA NA <2 5 <5 0 <5 0 <5 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 62 1 6 NA NA <2 5 <2 5 <5 0 <5 0 <5 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA 1 6 08 1 1 33 24 35 6 8 57 7 3 5 1 73 6 7 73 99 9 23 10.5 11.6 9 8 8 1 3 8 50 1 6 0 8 11.0 90 3 3 1 9 1 1 09 0 8 1 0 1 6 1 2 56 13.0 16.0 16.8 NA = not analyzed Shaded indicates concentrations exceeding GWQS TABLE 1 (14 of 27) Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2014 Chloroform Contamination Investigation DUSA White Mesa Mill Well Sampling Event Parameter GWQS Carbon Tetrachloride (5 pg/L) Chloride No GWQS (mg/L) Chloroform (7Q pg/u Chloromethane (3Q pg/u Methylene Chloride (5 pg/u Nitrate, Nitrate + Nitrite (10 mg/L) TW4-11 1st Qtr 3/16/05 2nd Qtr 5/25/05 3rd Qtr 8/31/05 4th Qtr 12/7/05 1st Qtr 3/9/06 2nd Qtr 6/14/06 3rd Qtr 7/20/06 4th Qtr 11/8/06 1st Qtr 2/28/07 2nd Qtr 6/27/07 3rd Qtr 8/15/07 4th Qtr 10/10/07 1st Qtr 3/28/08 2nd Qtr 6/25/08 3rd Qtr 9/10/08 4th Qtr 10/15/08 11/18/08 1st Qtr 3/11/09 2nd Qtr 6/23/09 3rd Qtr 9/14/09 4th Qtr 12/29/09 1st Qtr 3/3/10 2nd Qtr 6/14/10 3rd Qtr 8/12/10 4th Qtr 10/15/10 1st Qtr 2/23/11 2nd Qtr 6/1/11 3rd Qtr 8/17/11 4th Qtr 11/16/11 1st Qtr 1/24/12 2nd Qtr 6/13/12 3rd Qtr 9/13/12 4th Qtr 10/3/12 1st Qtr 2/13/13 2nd Qtr 6/18/13 3rd Qtr 9/12/13 4th Qtr 11/13/13 1st Qtr 2/5/14 NA NA <10 <100 <50 <50 <50 <1 0 <1 0 <1 0 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA NA NA 1 7 1 3 1 6 1 7 1 6 NA 3 23 5.19 58 56 56 55 55 54 53 53 53 63 46 42 47 49 44 49 46 42 40 43 49 46 49 48 46 43 52 49 50 47 3 49 3 46 6 46 7 48 5 4,400 3,590 4,400 4,400 4,400 4,300 4,080 3,660 3,600 3,800 •„j ,^4,500 J£ Ji(4i,4b0 NA 340 ' 640 900 1,000 1,000 980 1,000 860 820 820 800 720 1,000 930 820 1500 610 660 740 •730 867 788 865 874 785 NA NA <10 <100 <50 <50 <50 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 27 NA NA <10 <100 <50 <50 <50 <1 0 <1 0 <1 0 <1 0 <1 0 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 1 3 1 6 1 2 NA 87 10.3 94 94 92 100 10 0 100 10.1 10.6 10.2 98 77 73 79 95 73 68 70 6 6 "68 6 9 67 64 6 5 73 7 1 7 1 68 67 30 70 68 74 7 8 80 8 5 NA = not analyzed Bold and italics indicates the MDL exceeded the GWQS Bold and italics indicates the MDL exceeded the GWQS TABLE 1 (15 of 27) Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2014 Chloroform Contamination Investigation DUSA White Mesa Mill Well Sampling Event Parameter GWQS Carbon Tetrachloride (5 pg/L) Chloride No GWQS (mg/L) Chloroform (70 P^L) Chloromethane (3Q pg/u Methylene Chloride (5 pg/L) Nitrate, Nitrate + Nitrite (10 mg/L) TW4-12 1st Qtr 3/16/05 2nd Qtr 5/25/05 3rd Qtr 8/31/05 4th Qtr 12/7/05 1st Qtr 3/9/06 2nd Qtr 6/14/06 3rd Qtr 7/20/06 4th Qtr 11/8/06 1st Qtr 2/28/07 2nd Qtr 6/27/07 3rd Qtr 8/15/07 4th Qtr 10/10/07 1st Qtr 3/28/08 2nd Qtr 6/25/08 3rd Qtr 9/10/08 4th Qtr 10/15/08 1st Qtr 3/11/09 2nd Qtr 6/23/09 3rd Qtr 9/14/09 4th Qtr 12/16/09 1st Qtr 2/23/10 2nd Qtr 6/14/10 3rd Qtr 8/10/10 4th Qtr 10/15/10 1st Qtr 2/15/11 2nd Qtr 5/25/11 3rd Qtr 8/16/11 4th Qtr 11/15/11 1st Qtr 1/17/12 2nd Qtr 5/31/12 3rd Qtr 8/29/12 4th Qtr 10/3/12 1st Qtr 2/13/13 2nd Qtr 5/29/13 3rd Qtr 8/29/13 4th Qtr 11/6/13 1st Qtr 1/22/14 NA NA <1 0 <1 0 <1 6 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA NA NA 19 19 16 16 16 16 18 29 16 16 19 18 22 23 22 22 23 22 29 35 31 31 32 31 30 28 34 39 39 36 7 38 6 41 7 41 4 41 6 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 58 1 0 26 1 4 1 4 NA NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 1 4 1 6 1 5 1 4 1 3 1 4 1 4 1 4 1 5 1 5 1 4 1 4 1 27 27 25 24 38 5 1 36 4 0 11.0 90 80 6 5 70 68 80 77 10.0 13.0 13.0 126 14.2 17.4 16.4 18.4 NA = not analyzed Shaded indicates concentrations exceeding GWQS TABLE 1 (16 of 27) Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2014 Chloroform Contamination Investigation DUSA White Mesa Mill Well Sampling Event Parameter GWQS Carbon Tetrachloride (5 pg/L) Chloride No GWQS (mg/L) Chloroform (70 P9/L) Chloromethane (30 pg/L) Methylene Chloride (5 pg/M Nitrate, Nitrate + Nitrite (10 mg/L) TW4-13 1st Qtr 3/16/05 2nd Qtr 5/25/05 3rd Qtr 8/31/05 4th Qtr 12/7/05 1st Qtr 3/9/06 2nd Qtr 6/14/06 3rd Qtr 7/20/06 4th Qtr 11/8/06 1st Qtr 2/28/07 2nd Qtr 6/27/07 3rd Qtr 8/15/07 4th Qtr 10/10/07 1st Qtr 3/28/08 2nd Qtr 6/25/08 3rd Qtr 9/10/08 4th Qtr 10/15/08 1st Qtr 3/4/09 2nd Qtr 6/23/09 3rd Qtr 9/14/09 4th Qtr 12/16/09 1st Qtr 2/24/10 2nd Qtr 6/14/10 3rd Qtr 8/10/10 4th Qtr 10/15/10 1st Qtr 2/15/11 2nd Qtr 5/25/11 3rd Qtr 8/16/11 4th Qtr 11/15/11 1st Qtr 1/17/12 2nd Qtr 5/31/12 3rd Qtr 8/29/12 4th Qtr 10/3/12 1st Qtr 2/13/13 2nd Qtr 5/29/13 3rd Qtr 8/29/13 4th Qtr 11/6/13 1st Qtr 1/22/14 NA NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA NA NA 69 67 66 65 33 59 59 58 58 54 58 50 58 58 57 63 60 53 53 55 55 60 56 60 54 55 59 60 60 59 3 56 63 5 58 5 63 1 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 3 1 1 7 1 4 NA NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 42 4 3 46 4 3 42 49 4 3 08 4 0 46 44 4 1 38 42 43 46 37 1 2 47 4 1 4 3 52 56 58 55 64 52 59 5 5 6 0 62 5 9, 63 68 72 65 7 1 NA = not analyzed Shaded indicates concentrations exceeding GWQS TABLE 1 (17 of 27) Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2014 Chloroform Contamination Investigation DUSA White Mesa Mill Well Sampling Event Parameter GWQS Carbon Tetrachloride (5 M9/L) Chloride No GWQS (mg/L) Chloroform I70»g/L) Chloromethane isoug"-) Methylene Chloride (5 ug/L) Nitrate, Nitrate + Nitrite (10 mg/L) TW4-14 1st Qtr 3/16/05 2nd Qtr 5/25/05 3rd Qtr 8/31/05 4th Qtr 12/7/05 1stQtr3/9/06 2nd Qtr 6/14/06 3rd Qtr 7/20/06 4th Qtr 11/8/06 1st Qtr 2/28/07 2nd Qtr 6/27/07 3rd Qtr 8/15/07 4th Qtr 10/10/07 1st Qtr 3/28/08 2nd Qtr 6/25/08 3rd Qtr 9/10/08 4th Qtr 10/15/08 1st Qtr 3/4/09 2nd Qtr 6/23/09 3rd Qtr 9/14/09 4th Qtr 12/16/09 1st Qtr 3/3/10 2nd Qtr 6/14/10 3rd Qtr 8/10/10 4th Qtr 10/15/10 1st Qtr 2/15/11 2nd Qtr 6/14/11 3rd Qtr 8/16/11 4th Qtr 11/15/11 1st Qtr 1/17/12 2nd Qtr 6/14/11 3rd Qtr 8/29/12 4th Qtr 10/3/12 1st Qtr 2/7/13 2nd Qtr 5/29/13 3rd Qtr 8/29/13 4th Qtr 11/6/13 1st Qtr 1/22/14 NS NS NS NS NS NS NS <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NS NS NS NS NS NS NS 37 38 38 36 38 57 35 34 40 35 36 38 34 33 49 35 29 25 24 33 15 20 35 37 37 35 2 38 6 37 6 36 5 35 5 NS NS NS NS NS NS NS NS <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NS NS NS NS NS NS NS <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <10 <1 0 <1 0 <1 0 <1 0 NS NS NS NS NS NS NS <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NS NS NS NS NS NS NS 24 23 1 4 1 1 08 04 1 6 1 38 0 76 1 6 1 4 1 5 1 4 25 29 28 29 1 8 1 4 26 1 7 1 9 33 39 39 46 44 45 4 8 5 9 NS = not sampled Shaded indicates concentrations exceeding GWQS TABLE 1 (18 of 27) Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2014 Chloroform Contamination Investigation DUSA White Mesa Mill Well Sampling Event Parameter GWQS Carbon Tetrachloride (5 ug/L) Chloride No GWQS (mg/L) Chloroform (7Q ug/L) Chloromethane (30 ug/L) Methylene Chloride (5 ug/L) Nitrate, Nitrate + Nitrite (10 mg/L) TW4-16 1st Qtr 3/16/05 2nd Qtr 5/25/05 3rd Qtr 8/31/05 4th Qtr 12/7/05 1st Qtr 3/9/06 2nd Qtr 6/14/06 3rd Qtr 7/20/06 4th Qtr 11/8/06 1st Qtr 2/28/07 2nd Qtr 6/27/07 3rd Qtr 8/15/07 4th Qtr 10/10/07 1st Qtr 3/28/08 2nd Qtr 6/25/08 3rd Qtr 9/10/08 4th Qtr 10/15/08 1st Qtr 3/4/09 2nd Qtr 6/23/09 3rd Qtr 9/14/09 4th Qtr 12/17/09 1st Qtr 2/24/10 2nd Qtr 6/14/10 3rd Qtr 8/24/10 4th Qtr 10/15/10 1st Qtr 2/22/11 2nd Qtr 5/26/11 3rd Qtr 8/17/11 4th Qtr 11/16/11 11112/7/11 1st Qtr 1/18/12 2nd Qtr 5/26/11 3rd Qtr 8/30/12 4th Qtr 10/3/12 1st Qtr 2/7/13 2nd Qtr 5/30/13 3rd Qtr 9/5/13 4th Qtr 11/7/13 1st Qtr 1/29/14 NA NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA NA NA NA 64 60 55 60 62 79 75 65 69 52 58 71 89 73 76 79 76 77 64 72 71 86 81 63 38 48 53 59 59 58 1 49 8 54 4 56 6 66 8 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 240 212 85 14 39 13 52 136 87 26 7 1 1 4 11 10 39 2 1 4 3 3 15 16 92 134 6 93 NA NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 32 26 1 1 24 NA NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 43 5.9 21 8.9 27 6.6 1 8 5.1 1 26 14 6.6 1 4 1 7 4 21 <0 1 <0 1 <0 1 <0 1 <0 1 <0 1 <0 1 <0 1 <0 1 1 4 3 1 9 27 56 12.3 99 54 44 <0 1 1 5 10.5 98 9 6 89 8 8 52 42 47 46 33 7 5 1 7 04 0 1 1 4 32 (1) VOCs were resampled because laboratory missed holding time NA = not analyzed Shaded indicates concentrations exceeding GWQS TABLE 1(19 of 27) Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2014 Chloroform Contamination Investigation DUSA White Mesa Mill Well Sampling Event TW4-18 1st Qtr 3/16/05 2nd Qtr 5/25/05 3rd Qtr 8/31/05 4th Qtr 12/7/05 1st Qtr 3/9/06 2nd Qtr 6/14/06 3rd Qtr 7/20/06 4th Qtr 11/8/06 1st Qtr 2/28/07 2nd Qtr 6/27/07 3rd Qtr 8/15/07 4th Qtr 10/10/07 1st Qtr 3/28/08 2nd Qtr 6/25/08 3rd Qtr 9/10/08 4th Qtr 10/15/08 1st Qtr 3/4/09 2nd Qtr 6/23/09 3rd Qtr 9/14/09 4th Qtr 12/22/09 1st Qtr 2/24/10 2nd Qtr 6/14/10 3rd Qtr 8/12/10 4th Qtr 10/15/10 1st Qtr 2/22/11 2nd Qtr 5/26/11 3rd Qtr 8/17/11 4th Qtr 11/16/11 ,1112/7/11 1st Qtr 1/18/12 2nd Qtr 6/13/12 3rd Qtr 9/11/12 4th Qtr 10/3/12 1st Qtr 2/13/13 2nd Qtr 6/13/13 3rd Qtr 9/5/13 4th Qtr 11/13/13 1st Qtr" 1/30/14 Parameter GWQS Carbon Tetrachloride (5 pg/L) NA NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 Chloride No GWQS (mg/L) NA NA NA 41 36 35 35 34 30 28 32 27 23 23 26 30 29 30 26 30 41 35 37 50 52 36 23 23 NA 18 30 26 27 23 1 22 9 36 2 37 1 38 9 Chloroform (70 pg/L) NA 38 29 8 39 14 12 12 108 125 92 8 89 74 64 57 8 94 11 16 13 82 69 29 29 30 39 26 29 28 25 24 38 30 34 9 37 9 41 44 3 6 93 Chloromethane (3Qpg/u NA NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 28 1 1 1 6 27 Methylene Chloride (5 Pg/L) NA NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 Nitrate, Nitrate + Nitrite (10 mg/L) NA 14.1 12.9 133 73 5 9 47 6 1 57 5 1 49 5 0: 44 07 46 49 52 5 2 62 59 5j* 5 1 90 90 10.0 100 90 46 6 3 4 4 66 66 60 56 89 12.1 J4^2 12.8, (1) VOCs were resampled because laboratory missed holding time NA = not analyzed Shaded indicates concentrations exceeding GWQS TABLE 1 (20 of 27) Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2014 Chloroform Contamination Investigation DUSA White Mesa Mill Well Sampling Event Parameter GWQS Carbon Tetrachloride (5 ug/L) Chloride No GWQS (mg/L) Chloroform (70 pg/L) Chloromethane (30 pg/L) Methylene Chloride (s pg/L) Nitrate, Nitrate + Nitrite (10 mg/L) TW4-19 chlorofrom pumping well 1st Qtr 3/16/05 2nd Qtr 5/25/05 3rd Qtr 8/31/05 4th Qtr 12/7/05 1st Qtr 3/9/06 2nd Qtr 6/14/06 3rd Qtr 7/20/06 4th Qtr 11/8/06 1st Qtr 2/28/07 2nd Qtr 6/27/07 3rd Qtr 8/15/07 4th Qtr 10/10/07 1st Qtr 3/28/08 " 2nd Qtr 6/25/08 3rd Qtr 9/10/08 4th Qtr 10/15/08 1st Qtr 3/4/09 2nd Qtr 6/23/09 3rd Qtr 9/14/09 4th Qtr 12/22/09 1st Qtr 2/17/10 2nd Qtr 6/14/10 3rd Qtr 8/16/10 4th Qtr 10/15/10 1st Qtr 2/17/11 2nd Qtr 6/7/11 3rd Qtr 8/17/11 4th Qtr 11/17/11 11112/5/11 1st Qtr 1/23/12 2nd Qtr 6/6/12 3rd Qtr 9/4/12 4th Qtr 10/3/12 1st Qtr 2/13/13 2nd Qtr 6/5/13 3rd Qtr 9/3/13 4th Qtr 10/29/13 1st Qtr 1/27/14 NA NA <5 0 <50 <50 <50 <50 Did not sample <1 0 1 6 1 3' 1 9 1 9 2 9 8.6 _L2 1 2 1 2 15 16 1 3 42 49 1 3 17 8,3 2 1 SA 1 5 1 1 35 4 5.15 5.15 120.7 6.42 4 05 NA NA NA 81 86 116 123 134 133 129 132 131 128 113 124 127 132 43 124 144 132 142 146 135 148 148 148 138 149 149 150 164 148 179 134 134 2,200 1,200 1,400 2,800 1,200 1,100 1,120 1,050 1,200 1,100 ,1,100 1,800 1,000 3,600 JL200 1,100 990 6,600 4,700 940 1,800 2,000 JL200 3,400 4,000 970 2,200 650 460 950 1500 4,210 2,070 8,100 942 586 NA NA <5 0 <50 <50 <50 <50 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 26 NA NA <5 0 <50 <50 <50 <50 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <0 1 53 57 46 4 5 2 43 46 4 4 1 4 22 2 8 35.2 47.8 32 24 <0 1 26.7I 2 44 59 _27 17.6 12.0 30 50 06 24 2 5 4 1 80 30 17.6 47 1 6' (1) VOCs were resampled because laboratory missed holding time NA = not analyzed Bold and italics indicates the MDL exceeded the GWQS Shaded indicates concentrations exceeding GWQS TABLE 1 (21 of 27) Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2014 Chloroform Contamination Investigation DUSA White Mesa Mill Well Sampling Event Parameter GWQS Carbon Tetrachloride (Sua"-) Chloride No GWQS (mg/L) Chloroform Chloromethane oo ug/L) Methylene Chloride (s ug/L) Nitrate, Nitrate + Nitrite (10 mg/L) TW4-20 chloro pumping well 1st Qtr 3/16/05 2nd Qtr 5/25/05 3rd Qtr 8/31/05 4th Qtr 12/7/05 1st Qtr 3/9/06 2nd Qtr 6/14/06 3rd Qtr 7/20/06 4th Qtr 11/8/06 1st Qtr 2/28/07 2nd Qtr 6/27/07 3rd Qtr 8/15/07 4th Qtr 10/10/07 1st Qtr 3/28/08 2nd Qtr 6/25/08 3rd Qtr 9/10/08 4th Qtr 10/15/08 1st Qtr 3/4/09 2nd Qtr 6/23/09 3rd Qtr 9/14/09 4th Qtr 12/14/09 1st Qtr 2/17/10 2nd Qtr 6/14/10 3rd Qtr 8/16/10 4th Qtr 10/15/10 1st Qtr 2/23/11 2nd Qtr 6/1/10 3rd Qtr 8/17/11 4th Qtr 11/16/11 1st Qtr 1/23/12 2nd Qtr 6/6/12 3rd Qtr 9/4/12 4th Qtr 10/3/12 1st Qtr 2/11/13 2nd Qtr 6/5/13 3rd Qtr 9/3/13 4th Qtr 10/29/13 1st Qtr 1/27/14 NA <10 <250 <500 <500 <1000 NA 7.1 3 1 22 35 6.8 5.7 49 8.4 14 27 11 12 20 27 10 7.3 72 19.6 32.5 25.7 17.3 18.4 NA NA 131 120 235 134 124 124 112 117 170 132 191 156 168 164 164 153 187 179 200 196 203 220 177 207 186 207 262 289 302 252 250 260 272 254 ;-0 NA Monitor well was not installed 39,000 3,800 19,000 , 9,200 61,000 5,300 11,000 4,400 1,800 5,200 9,000 13,000 730,000 21,000 8,200 6,800 13,000 15,000 3,500 18,000 15,000 .24^000 ^31,000 : 8,100 3,800 ' -7.900 11,000 36,000 13,000 19,000 18,500 26,300 26,800 15,700 17,800 NA <10 <250 <500 <500 <1000 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 1 9 NA <10 <250 <500 <500 <1000 <1 0 NA <1 0 <1 0 <1 0 22 1 1 1 8 1 9 1 5 1 2 37 5.2 42 44 30 32 37 22 55 19.0 2 1 3 1 25 1 3 1 21 1 3 2 14 1 37 2 04 • 10:1 29 1 8 38 94 29 35 "4 2 23 2 1 56 09 80 44 55 5 1 29 3 3 53 20 56 53 46 44 48 65 42 79 11.0 10.8 11.0 9" 1 98 87 96 76 (1) VOCs were resampled because laboratory missed holding time NA = not analyzed Bold and italics indicates the MDL exceeded the GWQS Shaded indicates concentrations exceeding GWQS TABLE 1 (22 of 27) Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2014 Chloroform Contamination Investigation DUSA White Mesa Mill Well Sampling Event Parameter GWQS Carbon Tetrachloride (5 M9/L) Chloride No GWQS (mg/L) Chloroform <70pg/u Chloromethane (3°pg"-) Methylene Chloride <5ug/L) Nitrate, Nitrate + Nitrite (10 mg/L) TW4-21 1st Qtr 3/16/05 2nd Qtr 5/25/05 3rd Qtr 8/31/05 4th Qtr 12/7/05 1st Qtr 3/9/06 2nd Qtr 6/14/06 3rd Qtr 7/20/06 4th Qtr 11/8/06 1st Qtr 2/28/07 2nd Qtr 6/27/07 3rd Qtr 8/15/07 4th Qtr 10/10/07 1st Qtr 3/28/08 2nd Qtr 6/25/08 3rd Qtr 9/10/08 4th Qtr 10/15/08 11/18/08 1st Qtr 3/11/09 2nd Qtr 6/23/09 3rd Qtr 9/14/09 4th Qtr 12/22/09 1st Qtr 2/25/10 2nd Qtr 614/10 3rd Qtr 8/13/10 4th Qtr 10/15/10 1st Qtr 2/22/11 2nd Qtr 6/28/11 3rd Qtr 8/17/11 4th Qtr 11/16/11 12/7/11 1st Qtr 1/19/12 2nd Qtr 6/13/12 3rd Qtr 9/13/12 4th Qtr 10/4/12 1st Qtr 2/13/13 2nd Qtr 6/18/13 3rd Qtr 9/13/13 4th Qtr 11/13/13 1st Qtr 2/5/14 NA <5 0 <1 0 <2 5 <2 5 <2 5 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 2 1 8 5.8 7 1 7 1 6 1 2 — 48 6^3 6.7 6.4 5.4 6 7 5.25 3 49 2 13 6.23 NA NA NA 353 347 318 357 296 306 327 300 288 331 271 244 284 279 291 281 256 '228 266 278 210 "303 290 287 287 228 285 142 270 221 243 207 206 200 Monitor well was not installed 192 : 78 ' 86 120 120 108 139 160 '• 300 140 i120 H 390 C80 %Vt '120 , 170 NA 180 200 200 160 170 210 390 200 230 290 460 390 420 400 410 390 282 328 244 204 220 NA <5 0 <1 0 "<2 5 <2 5 <2 5 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <5 0 <1 0 <2 5 <2 5 <2 5 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 2 04 NA • 14.6 10.1 96 8 5 10.2 89 87 8 7 86 86 83 14.3 88 7 57 8 0 8 3 8 1 92 84 "Ti 12.6 14 0 70 'To 12.0 14.0 13.0 15.0 11.0 •13.0 14.0 11.8 13.8 10.3 90 11.4 (1) VOCs were resampled because laboratory missed holding time NA = not analyzed Shaded indicates concentrations exceeding GWQS TABLE 1 (23 of 27) Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2014 Chloroform Contamination Investigation DUSA White Mesa Mill Well Sampling Event Parameter GWQS Carbon Tetrachloride (5 ug'L) Chloride No GWQS (mg/L) Chloroform (70 M9/L) Chloromethane Methylene Chloride (5 pg/L) Nitrate, Nitrate + Nitrite (10 mg/L) TW4-22 nitrate pumping wefl 1st Qtr 3/16/05 2nd Qtr 5/25/05 3rd Qtr 8/31/05 4th Qtr 12/7/05 1st Qtr 3/9/06 2nd Qtr 6/14/06 3rd Qtr 7/20/06 4th Qtr 11/8/06 1st Qtr 2/28/07 2nd Qtr 6/27/07 3rd Qtr 8/15/07 4th Qtr 10/10/07 1st Qtr 3/28/08 2nd Qtr 6/25/08 3rd Qtr 9/10/08 4th Qtr 10/15/08 11/18/08 1st Qtr 3/11/09 2nd Qtr 6/23/09 3rd Qtr 9/14/09 4th Qtr 12/29/09 1st Qtr 3/3/10 2nd Qtr 6/14/10 3rd Qtr 8/24/10 4th Qtr 10/15/10 1st Qtr 2/22/11 2nd Qtr 6/1/11 3rd Qtr 8/17/11 4th Qtr 11/16/11 12/7/11 1st Qtr 1/19/12 2nd Qtr 6/13/12 3rd Qtr 9/12/12 4th Qtr 10/4/12 1st Qtr 2/11/13 2nd Qtr 6/5/13 3rd Qtr 9/3/13 4th Qtr 10/29/13 1st Qtr 1/27/14 NA <5 0 <5 0 <10 <10 <10 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 1 3 1 2 3 24 3 35 3 25 _8 09 606 NA NA NA 253 236 221 221 236 347 273 259 238 519 271 524 539 177 177 391 175 427 134 130 134 114 138 120 174 NA 36 35 130 130 586 487 501 598 NA NA Monitor well was not installed 340 290 320 390 280 '864 350 440 740 530 440 1,400 1,200 6,300 630 390 730 2,300 380 2,200 540 340 340 1,300 210 450 _ 400 "20b" 120 :A?21 " 330 10,600 12,500 9,640 13,300 12,100 NA <5 0 <5 0 <10 <10 <10 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 1 6 NA <5 0 <5 0 <10 <10 <10 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 2 83 NA NA ; 18.2 15.7 15.1 15.3 14.3 14.5 15.9 20.9 19.3 19.3 18.8 39.1 41.9 38.7 36.3 20.7 20.6 40.3 17.8 36.8 19.0 15.0 16.0 180 17.0 15.0 19.0 'I4.6 12.8 70 14.0 58.0 50.2 29.7 _<5.2 54.6 (1) VOCs were resampled because laboratory missed holding time NA = not analyzed Shaded indicates concentrations exceeding GWQS Bold and italics indicates the MDL exceeded the GWQS TABLE 1 (24 of 27) Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2014 Chloroform Contamination Investigation DUSA White Mesa Mill Well Sampling Event Parameter GWQS Carbon Tetrachloride (5 ug/L) No Chloride GWQS (mg/L) Chloroform (70 pg/L) Chloromethane (30 pg/L) Methylene Chloride (5 Pg/L) Nitrate, Nitrate + Nrtnte (10 mg/L) TW4-23 2nd Qtr 6/27/07 3rd Qtr 8/15/07 4th Qtr 10/10/07 1st Qtr 3/28/08 2nd Qtr 6/25/08 3rd Qtr 9/10/08 4th Qtr 10/15/08 11/18/08 1st Qtr 3/4/09 2nd Qtr 6/23/09 3rd Qtr 9/14/09 4th Qtr 12/16/09 1st Qtr 2/24/10 2nd Qtr 6/14/10 3rd Qtr 8/24/10 4th Qtr 10/15/10 1st Qtr 2/16/11 2nd Qtr 6/14/11 3rd Qtr 8/16/11 4th Qtr 11/15/11 1st Qtr 1/17/12 2nd Qtr 5/31/12 3rd Qtr 8/29/12 4th Qtr 10/3/12 1st Qtr 2/7/13 2nd Qtr 5/30/13 3rd Qtr 9/5/13 4th Qtr 11/7/13 1st Qtr 1/23/14 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA 47 46 43 41 41 35 51 41 43 43 37 45 40 40 34 44 44 41 43 40 44 46 45 43 6 44 7 48 43 44 6 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <0 1 <0 1 <0 1 <0 1 <0 1 <0 05 <0 05 NA <0 1 <0 1 <0 1 <0 1 <0 1 <0 1 <0 1 <0 1 <0 1 <0 1 <0 1 <0 1 <0 1" <0 1 <0 1 <0 1 <0 1 0 1 <0 1 <0 1 <0 1 NA = not analyzed Shaded indicates concentrations exceeding GWQS TABLE 1 (25 of 27) Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2014 Chloroform Contamination Investigation DUSA White Mesa Mill Well Sampling Event Parameter GWQS Carbon Tetrachloride (5 U9'L) Chloride No GWQS (mg/L) Chloroform (70 ug'L) Chloromethane Methylene Chloride (5 ug/L) Nitrate, Nitrate + Nitnte (10 mg/L) TW4-24 nitrate pumping well 2nd Qtr 6/27/07 3rd Qtr 8/15/07 4th Qtr 10/10/07 1st Qtr 3/28/08 2nd Qtr 6/25/08 3rd Qtr 9/10/08 4th Qtr 10/15/08 11/18/08 1st Qtr 3/4/09 2nd Qtr 6/23/09 3rd Qtr 9/14/09 4th Qtr 12/16/09 1st Qtr 2/25/10 2nd Qtr 6/14/10 3rd Qtr 8/24/10 4th Qtr 10/15/10 1st Qtr 2/17/11 2nd Qtr 5/26/11 3rd Qtr 8/17/11 4th Qtr 11/16/11 11112/7/11 1st Qtr 1/16/12 2nd Qtr 6/6/12 3rd Qtr 8/30/12 4th Qtr 10/3/12 1st Qtr 2/11/13 2nd Qtr 6/5/13 3rd Qtr 8/30/13 4th Qtr 10/29/13 1st Qtr 1/27/14 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA NA 1 18 770 791 692 740 834 1180 1130 1010 759 618 1080 896 639 587 522 1100 1110 967 608 373 355 489 405 1260 916 998 1030 809 NA <2 0 NA <1 0 <1 0 <1 0 (1) VOCs were resampled because laboratory missed holding time NA = not analyzed Shaded indicates concentrations exceeding GWQS 26 22 1 5 1 5 1 4 29 1 4 1 5 1 4 1 2 1 3 1 7 1 8 1 4 1 8 1 1 1 7 1 2 1 1 174 21 8 32 5 78 5 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 ' <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 •26.1 29 24.7 NA 24.4 45.3 38.4 44.8 30.5 •30.4 30.7 283 33.1 30 31 31 NA 35.9 23.7 33 35 31 6 TABLE 1 (26 of 27) Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2014 Chloroform Contamination Investigation DUSA White Mesa Mill Well Sampling Event Parameter GWQS Carbon Tetrachloride (5 ug/L) Chloride No GWQS (mg/L) Chloroform <7Q pg/u Chloromethane (30 ug/L) Methylene Chloride (5 ug/U Nitrate, Nitrate + (10 mg/L) Nitrite TW4-25 nitrate pumping well 2nd Qtr 6/27/07 3rd Qtr 8/15/07 4th Qtr 10/10/07 1st Qtr 3/28/08 2nd Qtr 6/25/08 3rd Qtr 9/10/08 4th Qtr 10/15/08 4th Qtr 11/18/09 1st Qtr 3/4/09 2nd Qtr 6/23/09 3rd Qtr 9/14/09 4th Qtr 12/14/09 1st Qtr 2/23/10 2nd Qtr 6/14/10 3rd Qtr 8/10/10 4th Qtr 10/15/10 1st Qtr 2/16/11 2nd Qtr 5/25/11 3rd Qtr 8/16/11 4th Qtr 11/15/11 1st Qtr 1/16/12 2nd Qtr 5/31/12 3rd Qtr 9/4/12 4th Qtr 10/3/12 1st Qtr 2/11/13 2nd Qtr 6/5/13 3rd Qtr 9/4/13 4th Qtr 10/31/13 1st Qtr 1/27/14 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA 395 382 358 374 344 333 366 332 328 328 371 296 306 250 312 315 321 276 294 " 304 287 334 338 "190 136 119 88 6 85 7 <1 0 <1 0 <1 0 <1 0 <1 0 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 22 1 8 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA 17.1 29 17 16.7 22.1 18.8 21.3 15.3 '•15.3 3 3 14.2 14.4 16 14 15 -15 16 16 16 16 16 17 17 9 04 5 24 6 6 22 (1) VOCs were resampled because laboratory missed holding time NA = not analyzed Shaded indicates concentrations exceeding GWQS TABLE 1 (27 of 27) Historic Summary Of Monitoring Parameters Up To The 1st Quarter 2014 Chloroform Contamination Investigation DUSA White Mesa Mill Well Sampling Event Parameter GWQS Carbon Tetrachloride (5 ug/L) Chloride No GWQS (mg/L) Chloroform (70 ug/L) Chloromethane (3Q pg/L) Methylene Chloride (5 Mg/L) Nitrate, Nitrate + Nitrite (10 mg/L) TW4-26 2nd Qtr 6/14/10 3rd Qtr 8/24/10 4th Qtr 10/15/10 1st Qtr 2/16/11 2nd Qtr 5/26/11 3rd Qtr 8/17/11 4th Qtr 11/16/11 1,2/7/11 1st Qtr 1/18/12 2nd Qtr 6/6/12 3rd Qtr 9/11/12 4th Qtr 10/3/12 1st Qtr 2/7/13 2nd Qtr 6/13/13 3rd Qtr 9/5/13 4th Qtr 11/7/13 1st Qtr 1/29/14 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA 33 17 22 30 15 19 26 17 19 19 19 16 6 14 5 17 6 159 16 9 NA 13 52 54 2 29 28 52 7 4 1 49 4 9 49 2 12 2 81 3 37 1 43 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 NA <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 7 9 90 96 100 100 11.0 100 NA 11.0 12.0 90 •12.0 •?'.«.f'.'fft12.5 "*13.6 11.7 15.9 14 2 TW4-27 1st Qtr 1/18/12 2nd Qtr 6/13/12 3rd Qtr 9/4/12 4th Qtr 10/3/12 1st Qtr 2/7/13 2nd Qtr 6/13/13 3rd Qtr 8/30/13 4th Qtr 11/6/13 1st Qtr 1/23/14 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 11 17 21 18 188 20 3 19 21 8 31 8 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 24.0 41.0 37.0 36 0 31 2 29.4 27.2 29.8 31.3 TW4-28 2nd Qtr 6/19/13 3rd Qtr 8/29/13 4th Qtr 11/6/13 1st Qtr 1/22/14" <1 0 <1 0 <1 0 <1 0 44 6 45 3 45 3 47 8 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 14.9 17.3 16.2 16.9 TW4-29 2nd Qtr 6/19/13 2nd Qtr 7/11/13 3rd Qtr 9/26/13 4th Qtr 11/13/13 1st"Qtr2/5/14 <1 0 <1 0 <1 0 <1 0 <1 0 44 8 37 7 41 4 42 5 14 9 242 •-rr 262 ;}:!••• 246 " 260 1*^258 <1 0 <1 0 <1 0 <1 0__ <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 46 35 42 4 1 46 TW4-30 2nd Qtr 6/19/13 3rd Qtr 9/26/13 4th Qtr 11/13/13 1st Qtr 1/23/14 <1 0 <1 0 <1 0 <1 0 36 36 3 35 9 36 9 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 1 0 1 1 2 1 4 TW4-31 2nd Qtr 6/19/13 3rd Qtr 9/5/13 4th Qtr 11/7/13 1st Qtr 1/23/14 <1 0 <1 0 <1 0 <1 0 28 4 29 4 28 28 5 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 1 3 1 1 1 3 1 3 TW4-32 4th Qtr 11/14/13 1st Qtr 1/22/14 <1 0 <1 0 52 1 54 5 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 4 3 5 1 TW4-33 4th Qtr 11/14/13 1st Qtr 1/30/14 <1 0 <1 0 47 2l 4351 126 <1 0 124 <1 0 <1 0 <1 0 1 8 26 TW4-34 4th Qtr 11/14/13 1st Qtr 1/23/14 <1 0 <1 0 192 20 4 <1 0 <1 0 <1 0 1<1 0 <1 0 <1 0 1 6 1 9 Shaded indicates concentrations exceeding GWQS (1) VOCs were resampled because laboratory missed holding time Table 2 Summary of QA/QC Samples 1st Quarter 2014 Parameter GWQS Dup TW4-28 cate of TW4-28 TW4-65 RPD Duplicate of MW-32 MW-32 TW4-70 RPD Nitrate + Nitrite (as N)^ Chloride 10 mg/L Chloroform none 70 ug/L 16.9 47.8 18.1 47.5 -6\9 0.6 <0.1 <0.1 34 34.2 <1.0 <1.0 nc <1.0 Carbon tetrachloride 5 ug/L Chloromethane 30 ug/L <1.0 <1.0 <1.0 O.O nc nc <1.0 <1.0 <L0 <i.o~ Methylene Chloride 5 MQ/L <1.0 <1.0 nc <1.0 <1.0 nc -0.6 nc nc nc nc nc = not calculated Tabel 3 Chloroform Mass Removal Calculations DUSA White Mesa Mill, Bland, Utah 1st Quarter 2014 Well ID MW4 MW-26 TW4-4 TW4-19 TW4-20 TW4-22 TW4-24 TW4-25 Ave Chloroform (ug/L) Chloroform (g/L) Chloroform (Ibs/L) Chloroform (lbs/gal) Total gallons pumped 1st qtr 2014 lbs of chloroform removed Gallons of chloroform removed 1,390 1 39E-03 3.07E-06 1.16E-05 69,834 0.81 0 07 1,400 1 40E-03 3 09E-06 1 17E-05 23,263 0.27 0 02 1,260 1 26E-03 2.78E-06 1 05E-05 58,993 0.62 0.05 586 5 86E-04 1 29E-06 4.90E-06 304,851 1.49 012 17,800 1 78E-02 3 93E-05 1.49E-04 18,782 2.80 0 23 12,100 1 21 E-02 2 67E-05 1.01E-04 24,532 2.48 0.20 78 5 7 85E-05 1 73E-07 6 56E-07 229,064 0.15 0.012 0 0 00E+00 0 00E+00 0 00E+00 129,979 0.00 0 00 total lbs of chloroform removed 8.63 total gallons of chloroform removed 0 70