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HomeMy WebLinkAbout8301_ScotlandMSWLF_GWMR_DIN28068_20161019This page intentionally left blank. Octo This ober 201 S La NC Scotla La document is inte for the pu 6 Ground Scotland aurinburg Solid Wa P and County P 507 W. C aurinburg, N Jan © 2016 S ended for the sol urpose agreed on dwater M County L g, North C ste Perm Prepared for: Public Work Covington St North Caroli nuary 2017 Prepared by: Smith Gardner, I le use of the clien n by the client and Monitorin andfill Carolina it # 83-01 ks Departme treet na 28352 7 Inc. ent for which it wa d Smith Gardner ng Repor 1 ent as prepared and r, Inc. rt This page intentionally left blank. This page intentionally left blank. Scotland County Landfill October 2016 Groundwater Monitoring Report January 2017 Table of Contents Page i Scotland County Landfill Solid Waste Permit No. 83-01 October 2016 Water Quality Monitoring Report Table of Contents Page 1.0 INTRODUCTION ......................................................................................................... 2  2.0 SITE GEOLOGY ........................................................................................................... 2  3.0 SAMPLING LOCATIONS ............................................................................................. 2  4.0 SAMPLING PROCEDURES ......................................................................................... 3  5.0 FIELD & LABORATORY RESULTS .............................................................................. 3  5.1 Laboratory Analysis ................................................................................................... 3  5.2 Field Results .............................................................................................................. 4  5.3 Inorganic Constituent Laboratory Results ............................................................... 4  5.4 Organic Constituent Laboratory Results .................................................................. 4  5.5 Surface Water Analytical Results ............................................................................. 5  6.0 CORRECTIVE MEASURES UPDATE ............................................................................ 5  7.0 STATISTICAL ANALYSIS AND RESULTS .................................................................... 5  7.1 Statistical Analysis .................................................................................................... 5  7.2 Statistical Results ..................................................................................................... 5  8.0 GROUNDWATER CHARACTERIZATION ...................................................................... 6  9.0 CONCLUSIONS .......................................................................................................... 6  FIGURES Figure 1 Groundwater Potentiometric Surface Map Figure 2 Total VOC Isoconcentration Map TABLES Table 1 Groundwater Elevations Table 2 Field Parameter Results Table 3 Detected Inorganic Consituents Table 4 Detected Organic Constituents Table 5 Indicator Parameters Table 6 Statistical Analysis Summary Table 7 Conductivity and Velocity Calculations APPENDICES Appendix A Monitoring Well Information Appendix B Laboratory Analytical Report Appendix C Time vs. Concentration Graphs This page intentionally left blank. Scotland County Landfill October 2016 Groundwater Monitoring Report January 2017 Page 2 1.0 INTRODUCTION The Scotland County Landfill, operating under Solid Waste Permit #83-01, is required to submit semi-annual groundwater monitoring reports (15A NCAC 13B.0544) for assessment monitoring. This report presents the results from the sampling conducted on October 19, 2016. The Scotland County Landfill contains two disposal areas. Phase I is located north of Old Maxton Road. Phases II and III are located south of Old Maxton Road. C&D waste is currently accepted over the closed Phases II and III. Municipal Solid Waste (MSW) is presently transferred off-site to a lined landfill in another county. The MSW landfill was closed per Solid Waste Regulations and the certification report1 was submitted to the Solid Waste Section (SWS) in August 1999. In 2007 the Scotland County Landfill was assessed to determine if groundwater issues would require a remediation plan. The Corrective Action Plan2 was approved on February 3, 2009. Section 8.0 of this report is an update regarding the current corrective action situation for this facility. This report includes a field procedure summary, laboratory and statistical analyses, groundwater characterization, summary tables, graphs and laboratory analytical reports. 2.0 SITE GEOLOGY According to the 1985 Geologic Map of North Carolina, the Scotland County Landfill is located in an area underlain by the Middendorf Formation. The Geology of the Carolinas3 describes the Middendorf Formation as deeply weathered at its type locality which has caused considerable difficulty in identification. In North Carolina the Middendorf is described as interbedded sands and clays with laterally discontinuous beds and common cross-bedding. Sandstone is the dominant lithology with the basal portion being conglomeritic with quartz and white kaolin clay clasts; believed to have been deposited in a fluvial upper delta plain environment. 3.0 SAMPLING LOCATIONS The groundwater monitoring network consists of twelve wells (MW-1 through MW-9 and MW-11 through MW-13) positioned around the landfill perimeter (Figure 1). MW-2 and MW-11 are only sampled during the spring event as approved in the March 2012 Revised Corrective Action Update4. MW-1 and MW-8 serve as the background wells for this site. Two surface water sampling points are located up and downstream of the landfill on Shoe Heel Creek. An equipment blank (EB) and trip blank (TB) were also analyzed for quality control purposes. Well depths range from 14.5 to 40 feet below grade. Available boring logs, presented in Appendix A, 1 Construction Quality Assurance Report, Scotland County Landfill Phase III Closure, G.N. Richardson & Associates, Inc. August 1999. 2 Corrective Action Plan, Scotland County Landfill, Richardson Smith Gardner and Associates, Approved February 2009. 3 Horton, J. Wright, and Zullo, Victor, A., The Geology of the Carolinas, University of Tennessee Press, 1991. 4 Revised Corrective Action Update, Scotland County Landfill. Richardson Smith Gardner and Associates. March 26, 2012. Scotland County Landfill October 2016 Groundwater Monitoring Report January 2017 Page 3 indicate they were installed in varying amounts of sand, silt and clay. Well construction details are provided in Table 1. 4.0 SAMPLING PROCEDURES Sampling procedures followed the protocols set forth in the site’s approved Water Quality Monitoring Plan2 and the North Carolina Water Quality Monitoring Guidance Document for Solid Waste Facilities (North Carolina Department of Environment and Natural Resources, Division of Waste Management). Each well was gauged to determine groundwater depth and then purged three to five well volumes or until dry. Water table elevations and are included in Table 1. Samples were collected in laboratory prepared containers for the specified analytical procedures. Sampling equipment, was brought to the site in sterile condition from the manufacturer or was cleaned in the laboratory and transported to the site in a condition to avoid potential contamination. Groundwater samples were properly preserved, placed on ice and transported to the laboratory facility within the specified hold times for analysis. 5.0 FIELD & LABORATORY RESULTS Analytical results were compared to the NC DWM Solid Waste Section Quantitation Limits (SWSLs), 15A NCAC 2L.0200 (2LStandard) and Federal Maximum Contaminant Limits (MCL). Surface water results were compared with the NCAC 2B Standard for Class C waters (2B Standard). Constituents detected between the Method Detection Limit (MDL) and SWSL are a non- quantifiable value defined by the laboratory as “J” values. Values reported below the MDL are considered non-detect. Select dissolved analysis was also performed on samples collected this event. An Alternate Source Demonstration Report will be submitted to DEQ under a separate cover. The laboratory analytical report is included as Appendix B. 5.1 Laboratory Analysis Samples were collected and analyzed by Environment 1, Inc., Greenville, NC, a North Carolina certified laboratory (NC Wastewater ID #10). Laboratory analysis for sampled locations included select Appendix I and II parameters as well as designated MNA parameters as identified in the approved March 26, 2012 revised corrective action update. Additional dissolved samples were collected and analysed for arsenic, chromium and vanadium. The MNA constituent, dissolved methane, was analyzed by Microseeps, Inc. (220 William Pitt Way, Pittsburg, PA 15238). Parameters were reported to the method detection limits (MDL) established for each compound. Analysis for this consituent was performed via the EPA approved method identified in the laboratory report. Scotland County Landfill October 2016 Groundwater Monitoring Report January 2017 Page 4 5.2 Field Results Field parameters pH, conductivity, temperature and turbidity, were collected by Environment 1; data is presented in Table 2. October 2016 data is generally consistent with previously recorded field measurements at the site; however, turbidity concentrations for several wells (MW-4, MW-7 and MW-12) were considerably higher than historically detected concentrations. 5.3 Inorganic Constituent Laboratory Results Two inorganic constituents were detected above their 2L Standard in samples collected this event.  Chromium (MW-12)  Iron (MW-1, MW-6, MW-7, MW-9, MW-12 and MW-13) Arsenic was also reprted in MW-4; at 10ug/l, the 2L Standard. Turbidity levels above historically reported concentrations, are believed to have contributed to additional inorangics detections this event. Dissolved analysis for arsenic (MW-4) and chromium confirmed inorganic detections were a result of suspended soilds in the collected groundwater samples. Vanadium (MW-12) was the only inorganic constituent detected above its GWP Standard for this event. High turbidity values resulting from naturally occurring metals likely contributed to inorganic detections this event. Dissolved analyses for vanadium confirmed high turbidity biased the results high and groundwater concetrations for this constituent do not exceed the GWP standard. Most inorganic constituents were non-quantifiable “J-values” or reported below the MDL. Inorganic detections are presented on Table 3. 5.4 Organic Constituent Laboratory Results Four organic constituents were detected above their 2L Standards:  1,1-Dichloroethane (MW-6),  1,4-Dichorobenzene (MW-6),  Benzene(MW-3, MW-6,and MW-9),  Vinyl chloride (MW-3, MW-4, MW-6 and MW-13). Tetrahydrofuran was not reported in the samples collected this event. Organic detections are presented on Table 4. Additionally, a total volatile organic compound (VOC) isopach map is presented as Figure 2. This map shows where VOC concentrations have been detected around the site for this sampling event. Scotland County Landfill October 2016 Groundwater Monitoring Report January 2017 Page 5 5.5 Surface Water Analytical Results No inorganic or organic constituents were reported above the 2B Standard in samples collected this event. 6.0 CORRECTIVE MEASURES UPDATE Scotland County is currently operating under a Corrective Action Plan (CAP)5 approved February 3, 2009, and a Revised Corrective Action Update letter6 to Brian Wootton at NCDENR SWS submitted on March 26, 2012. Adjustments to the MNA parameters were implemented starting with the spring 2012 sampling event based on verbal approval from NCDENR, including reduced sampling parameters, frequency and locations. Select MNA indicator parameters were collected and analyzed for MNA designated locations this event. Laboratory results indicate methanogenic processes continue to be present on site. Results are summarized in Table 5. Per the revised CAP, full MNA parameters will not be collected again until the spring and fall 2017 event. 7.0 STATISTICAL ANALYSIS AND RESULTS 7.1 Statistical Analysis Smith Gardner, Inc. (S+G) reviewed the laboratory data from this event to evaluate trends, examine major site changes and establish statistical significance while considering differences between up and down gradient wells. Data entry and analysis was performed using the Chempoint and Chemstat statistical software package developed specifically for RCRA Subtitle D sites (Starpoint Software, Cincinnati, OH). Chemstat follows EPA and DWM protocols for approved statistical analysis methods for groundwater data. The data from this event was added to our existing site database, reviewed to evaluate the most appropriate analysis methods and checked for outliers and erroneous results. Initial analysis to determine noteworthy changes or data trends involved basic data review and construction of a time-concentration graph for specific parameters (included in Appendix C). A statistical analysis summary is presented as Table 6. 7.2 Statistical Results Statistical analysis was performed for arsenic, chromium, iron and vanadium for reported total metals concentrations at or above their 2L or GWP Standards this event. Statistical analysis was not performed on constituents detected in background wells. Wilcoxon Rand Individual Well Test (Intra-well) was completed for iron. Parametric Prediction Limit Test (Inter-well) was completed for arsenic, chromium and vanadium. No concentrations were determined to be statistically significant this event. 5 Corrective Action Plan, Scotland County Landfill, Richardson Smith Gardner and Associates, Inc. January 2009, approved February 2009. 6 Letter from Joan Smyth of RSG to Brian Wootton of NCDENR dated March 26, 2012. Scotland County Landfill October 2016 Groundwater Monitoring Report January 2017 Page 6 8.0 GROUNDWATER CHARACTERIZATION A potentiometric surface map was prepared from groundwater elevations for this sampling event. In general, groundwater is flowing east toward Shoe Heel Creek Swamp. This is consistent with groundwater flow patterns previously reported for the site. The potentiometric surface map is attached as Figure 1. Groundwater flow velocities were calculated for monitoring wells MW-1 through MW-8 using the equation: V = Ki/n Where: K = hydraulic conductivity i = groundwater gradient n = porosity Groundwater flow velocities ranged from 0.386 ft/day (MW-2) to 1.345 ft/day (MW-8), and averaged 1.299 ft/day. Calculated flow velocities are presented in Table 7. 9.0 CONCLUSIONS Laboratory results indicate that water quality at the Scotland County Landfill is generally consistent with reported historical detections. Groundwater analysis indicates that inorganic parameter concentrations were likely influenced by high turbidity of naturally occurring metals in samples collected this event. Flow direction and gradient remain consistent with reported historical observations. The facility will continue semi-annual monitoring with the next event that will include full MNA analysis, scheduled for April 2017. Scotland County Landfill October 2016 Groundwater Monitoring Report January 2017 Page 7 This page intentionally left blank. FIGURES October 2016 Groundwater Monitoring Report Scotland County Landfill Solid Waste Permit No. 83-01 This page intentionally left blank. MW-2 TOC = 197.62DTW = 22.25 GWE = 175.37 MW-3 TOC = 192.92 DTW = 21.60 GWE = 171.32 MW-4 TOC = 191.11 DTW = 22.61 GWE = 168.50 MW-5 TOC = 193.69 DTW = 181.39 GWE = 12.30 MW-6 TOC = 186.44 DTW = 15.80 GWE = 170.64 MW-7 TOC = 194.53 DTW = 16.60GWE = 177.93 MW-8 TOC = 196.05 DTW = 8.33GWE = 187.72 MW-10 TOC = 193.31 DTW = 6.00 GWE = 187.31 MW-11 TOC = 179.82 DTW = 16.71 GWE = 163.11 MW-12* MW-13* MW-9 TOC = 171.22 DTW = 6.65 GWE = 164.57 MW-1 TOC = 192.83 DTW = 5.35 GWE = 187.48 G: \ C A D \ S c o t l a n d \ S c o t - 2 \ s h e e t s \ S C O T - B 0 1 7 8 . d w g - 12 / 1 6 / 2 0 1 6 2 : 3 5 P M SM I T H 14 N . B o y l a n A v e n u e , R a l e i g h N C 2 7 6 0 3 NC L I C . N O . C - 0 8 2 8 ( E N G I N E E R I N G ) 91 9 . 8 2 8 . 0 5 7 7 GA R D N E R + DR A W N : AP P R O V E D : PR O J E C T N O : SC A L E : FI L E N A M E : DA T E : FIG U R E N O . PR E P A R E D B Y : PR E P A R E D F O R : © 2016 Smith Gardner, Inc. SC O T L A N D C O U N T Y GR O U N D W A T E R P O T E N T I O M E T R I C S U R F A C E M A P OC T O B E R 2 0 1 6 T. R . S . M. M . G . AS S H O W N 1 De c 2 0 1 6 SC O T - 2 SC O T - B 0 1 7 8 0 200'400' TOC= DTW= GWE= MW-10 10 MW-11 MW-12 MW-13 0 20 30 30 20 10 0 40 50 60 70 80 90 40 50 60 70 80 90 MW-1 MW-2 MW-3 MW-4 MW-5 MW-6 MW-7 MW-8 MW-9 MW-10 LFG-1 LFG-2 LFG-3 LFG-4 LFG-5 LFG-6 LFG-7 LFG-8 LFG-9 LFG-10 LFG-11 WSW-1 WSW-2 2.6 ND ND 5.4 NDND 36.5 21.5 ND 4.2 NA ND NS NS NS MW-3 LFG-11 WSW-2 ND 0 250'500' G: \ C A D \ S c o t l a n d \ S c o t - 2 \ s h e e t s \ S C O T - B 0 1 7 9 . d w g - 12 / 1 6 / 2 0 1 6 3 : 3 6 P M SM I T H 14 N . B o y l a n A v e n u e , R a l e i g h N C 2 7 6 0 3 NC L I C . N O . C - 0 8 2 8 ( E N G I N E E R I N G ) 91 9 . 8 2 8 . 0 5 7 7 GA R D N E R + DR A W N : AP P R O V E D : PR O J E C T N O : SC A L E : FI L E N A M E : DA T E : FIG U R E N O . PR E P A R E D B Y : PR E P A R E D F O R : © 2016 Smith Gardner, Inc. TO T A L V O C IS O C O N C E N T R A T I O N M A P SC O T L A N D C O U N T Y L A N D F I L L OC T O B E R 2 0 1 6 T. R . S . M. M . G . AS S H O W N 2 De c 2 0 1 6 SC O T - 2 SC O T - B 0 1 7 9 DP-2 DP-1 DP-2 NS TABLES October 2016 Groundwater Monitoring Report Scotland County Landfill Solid Waste Permit No. 83-01 This page intentionally left blank. Ta b l e 1 Gr o u n d w a t e r E l e v a t i o n s Sc o t l a n d C o u n t y L a n d f i l l Oc t o b e r 1 9 , 2 0 1 6 By:MG Date: 12/12/2016 We l l We l l In s t a l l a t i o n Da t e La t i t u d e L o n g i t u d e We l l Di a m e t e r (i n c h e s ) To t a l We l l De p t h (f t b g s ) Gr o u n d Su r f a c e El e v a t i o n (f t a m s l ) TO C El e v a t i o n (f t a m s l ) De p t h t o Wa t e r ( f t bg s ) Wa t e r Ta b l e El e v a t i o n (f t b g s ) Sc r e e n In t e r v a l (f e e t b g s ) Screen Geology MW - 1 1 1 / 1 5 / 1 9 9 3 3 4 . 7 2 2 8 4 7 9 . 3 8 4 5 1 2 . 0 2 1 . 0 1 9 0 . 3 5 1 9 2 . 8 3 5 . 3 5 1 8 7 . 4 8 5 - 2 0 s a n d w i t h c l a y MW - 2 1 1 / 1 8 / 1 9 9 3 3 4 . 7 2 5 7 7 7 9 . 3 8 2 5 5 2 . 0 3 0 . 0 1 9 5 . 8 5 1 9 7 . 6 2 2 2 . 2 5 1 7 5 . 3 7 1 4 - 2 9 s a n d MW - 3 1 1 / 1 9 / 1 9 9 3 3 4 . 7 2 6 9 6 7 9 . 3 7 9 5 1 2 . 0 3 0 . 0 1 9 0 . 4 1 1 9 2 . 9 2 2 1 . 6 0 1 7 1 . 3 2 1 4 - 2 9 c l a y e y s a n d MW - 4 1 1 / 2 2 / 1 9 9 3 3 4 . 7 2 5 7 5 7 9 . 3 7 8 3 6 2 . 0 3 4 . 0 1 9 0 . 1 2 1 9 1 . 1 1 2 2 . 6 1 1 6 8 . 5 0 1 8 - 3 3 c l a y e y s a n d MW - 5 1 1 / 1 7 / 1 9 9 3 3 4 . 7 2 2 9 0 7 9 . 3 8 1 8 1 2 . 0 2 8 . 0 1 9 0 . 2 9 1 9 3 . 6 9 1 2 . 3 0 1 8 1 . 3 9 1 2 - 2 7 c l a y e y s a n d MW - 6 1 1 / 2 2 / 1 9 9 3 3 4 . 7 2 5 9 9 7 9 . 3 7 9 5 1 2 . 0 4 0 . 0 1 8 0 . 2 7 1 8 6 . 4 4 1 5 . 8 0 1 7 0 . 6 4 1 9 - 3 9 s a n d a n d c l a y MW - 7 1 1 / 2 3 / 1 9 9 3 3 4 . 7 2 8 2 1 7 9 . 3 8 0 6 7 2 . 0 3 0 . 0 1 9 1 . 9 9 1 9 4 . 5 3 1 6 . 6 0 1 7 7 . 9 3 1 4 - 2 9 s a n d y c l a y MW - 8 1 1 / 2 3 / 1 9 9 3 3 4 . 7 2 4 7 9 7 9 . 3 8 6 2 7 2 . 0 2 1 . 0 1 9 3 . 7 5 1 9 6 . 0 5 8 . 3 3 1 8 7 . 7 2 5 - 2 0 s a n d MW - 9 9 / 1 7 / 1 9 9 0 3 4 . 7 2 6 2 5 7 9 . 3 7 7 3 5 4 . 0 2 2 . 0 1 6 9 . 8 3 1 7 1 . 2 2 6 . 6 5 1 6 4 . 5 7 N A c l a y MW - 1 0 N A 34 . 7 2 2 2 7 79 . 3 8 4 1 5 N A N A 1 9 2 . 0 0 1 9 3 . 3 1 6 . 0 0 1 8 7 . 3 1 N A N A MW - 1 1 4 / 2 4 / 1 9 8 1 3 4 . 7 2 8 5 7 7 9 . 3 7 8 9 1 4 . 0 4 0 . 0 1 7 7 . 1 3 1 7 9 . 8 2 1 6 . 7 1 1 6 3 . 1 1 3 0 - 4 0 s a n d MW - 1 2 * 8 / 2 7 / 2 0 0 9 3 4 . 7 2 7 6 0 7 9 . 3 7 8 7 1 2 . 0 3 5 . 0 1 8 7 . 1 7 1 8 7 . 0 0 2 7 . 0 0 1 6 0 . 0 0 2 5 - 3 5 s i l t y s a n d MW - 1 3 * 8 / 2 7 / 2 0 0 9 3 4 . 7 2 6 4 4 7 9 . 3 7 7 2 4 2 . 0 1 4 . 5 1 6 2 . 0 0 1 6 2 . 0 0 2 . 8 3 1 5 9 . 1 7 4 . 5 - 1 4 . 5 s i l t y s a n d No t e : NA = n o t a v a i l a b l e bg s = b e l o w g r o u n d s u r f a c e am s l = a b o v e m e a n s e a l e v e l Wa t e r l e v e l d a t a c o l l e c t e d b y E n v i r o n m e n t 1 p e r s o n n e l . Av a i l a b l e w e l l l o g s p r o v i d e d i n Ap p e n d i x A *G S E a n d T O C a r e a p p r o x i m a t e f o r M W - 1 2 a n d M W - 1 3 Z:\ P r o j e c t s \ G r o u n d w a t e r M o n i t o r i n g R e p o r t s \ S c o t l a n d \ 2 0 . S c o t l a n d 4 - 1 5 \ 4 - 1 5 - s c o t _ g w _ t a b l e s - 1 Ta b l e 2 Fi e l d P a r a m e t e r R e s u l t s Sc o t l a n d C o u n t y L a n d f i l l Oc t o b e r 1 9 , 2 0 1 6 By:MG Date: 12/12/2016 We l l pH ( S t d Un i t s ) Sp e c i f i c Co n d u c t i v i t y (u m h o s / c m ) Te m p e r a t u r e (C e l s i u s ) Tu r b i d i t y (N T U ) MW - 1 5. 6 1 3 9 2 7 7 . 1 MW - 3 5. 3 1 5 2 2 3 6 . 1 MW - 4 5. 6 2 6 1 2 3 2 6 0 MW - 5 6. 2 4 6 7 2 5 1 9 MW - 6 5. 5 3 2 0 2 5 1 1 MW - 7 5. 9 9 1 8 2 2 7 0 0 MW - 8 4. 2 1 1 3 2 7 1 MW - 9 4. 7 2 4 2 2 3 3 2 MW - 1 2 6. 0 7 9 6 2 3 7 5 0 MW - 1 3 5. 5 3 0 7 2 2 3 7 Up s t r e a m 5. 4 9 6 2 0 N A Do w n s t r e a m 5. 3 47 2 2 NA No t e : NA = N o t A n a l y z e d Fi e l d m e a s u r e m e n t s c o l l e c t e d b y E n v i r o n m e n t 1 , I n c . pe r s o n n e l ; f r o m r e p o r t d a t e d : 1 2 / 1 / 2 0 1 6 , C l i e n t I D N o . 6 0 0 0 Z:\ P r o j e c t s \ G r o u n d w a t e r M o n i t o r i n g \ 2 . G r o u n d w a t e r M o n i t o r i n g R e p o r t s \ S c o t l a n d \ 2 0 . S c o t l a n d 4 - 1 5 \ 4 - 1 5 - s c o t _ g w _ t a b l e s - 1 Ta b l e 3 De t e c t e d I n o r g a n i c C o n s t i t u e n t s Sc o t l a n d C o u n t y L a n d f i l l Oc t o b e r 1 9 , 2 0 1 6 By: MG Date: 12/12/2016 Pa r a m e t e r M D L S W S L 2L / GW P * MC L 2 B M W - 1 M W - 3 M W - 4 M W - 5 M W - 6 M W - 7 M W - 8 M W - 9 M W - 1 2 M W - 1 3 U p s t r e a m D o w n s t r e a m An t i m o n y 0 . 0 5 6 1 * 6 6 4 0 < 0 . 0 5 0 . 0 9 J 0 . 0 7 J 0 . 1 3 J 0 . 0 7 J < 0 . 0 5 < 0 . 0 5 < 0 . 0 5 0 . 1 2 J < 0 . 0 5 0 . 0 6 J < 0 . 0 5 Ar s e n i c 0 . 6 6 1 0 1 0 1 0 1 0 < 0 . 6 6 5 . 8 J 1 0 2 . 7 J 2 . 2 J 2 . 6 J < 0 . 6 6 0 . 7 3 J 7 J 1 J < 0 . 6 6 1 . 8 J Ar s e n i c ( d i s s o l v e d ) 0 . 6 6 1 0 1 0 1 0 1 0 N A N A 0 . 8 6 J N A N A N A N A N A N A N A N A N A Ba r i u m 0 . 0 2 1 0 0 7 0 0 2 0 0 0 2 0 0 0 0 0 1 6 J 2 5 J 2 0 . 7 J 2 6 . 6 J 2 9 . 2 J 7 3 . 5 J 5 6 . 8 J 1 2 . 9 J 1 9 . 4 J 3 9 . 6 J 1 4 . 2 J 1 7 . 3 J Be r y l l i u m 0 . 0 4 1 4 * 4 6 . 5 < 0 . 0 4 0 . 0 8 J < 0 . 0 4 0 . 0 6 J < 0 . 0 4 < 0 . 0 4 0 . 2 1 J 0 . 0 6 J 0 . 3 1 J < 0 . 0 4 0 . 0 7 J 0 . 0 7 J Ca d m i u m 0 . 0 5 1 2 5 2 0 . 1 6 J 0 . 4 7 J 0 . 1 9 J 0 . 1 9 J 0 . 9 J 0 . 1 5 J 0 . 8 6 J 0 . 1 6 J 0 . 5 8 J 0 . 1 4 J < 0 . 0 5 < 0 . 0 5 Co b a l t 0 . 0 4 1 0 1 * NE 4 0 . 1 4 J 0 . 5 5 J 0 . 2 4 J 1 . 7 J 0 . 1 8 J 0 . 2 J 2 . 5 J 0 . 1 8 J 0 . 2 J 0 . 7 8 J 0 . 7 8 J 0 . 9 4 J To t a l C h r o m i u m 0 . 0 6 1 0 1 0 1 0 0 5 0 0 . 4 5 J 0 . 4 5 J 1 . 2 J 0 . 5 2 J 0 . 3 1 J 0 . 1 5 J 0 . 1 1 J 0 . 6 2 J 14 0.16 J 0 . 6 J 0 . 6 8 J To t a l C h r o m i u m ( d i s s o l v e d ) 0 . 0 6 1 0 1 0 1 0 0 5 0 N A N A N A N A N A N A N A N A < 0 . 0 6 N A N A N A Co p p e r 0 . 0 7 1 0 1 0 0 0 1 3 0 0 7 0 . 5 0 J 6 . 3 J 1 . 8 J 1 . 2 J 2 . 6 J 1 3 0 . 4 5 J 1 . 2 J 3 . 5 J 0 . 4 6 J 0 . 7 9 J 0 . 9 9 J Ir o n 5 . 2 3 3 0 0 3 0 0 3 0 0 1 0 0 0 49 8 NA N A N A 29 6 9 7 1 1 2 0 8 1 NA 69 0 4 NA N A N A N A Le a d 0 . 0 6 1 0 1 5 1 5 2 5 0 . 5 6 J 0 . 3 7 J 1 . 1 J 1 . 8 J 0 . 1 6 J 0 . 3 8 J 1 . 4 J 0 . 7 3 J 6 . 6 J 1 J 0 . 6 6 J 0 . 8 2 J Me r c u r y 0 . 0 4 0 . 2 1 2 0 . 0 1 2 < 0 . 0 4 < 0 . 0 4 < 0 . 0 4 < 0 . 0 4 < 0 . 0 4 < 0 . 0 4 < 0 . 0 4 < 0 . 0 4 < 0 . 0 4 0 . 1 6 J N A N A Ni c k e l 0 . 0 6 5 0 1 0 0 N E 8 8 0 . 3 1 J 1 . 1 J 0 . 5 4 J 1 . 8 J 0 . 4 9 J 1 J 1 . 9 J 0 . 4 8 J 0 . 7 4 J 0 . 5 7 J 1 J 1 . 2 J Se l e n i u m 0 . 5 4 1 0 2 0 5 0 5 < 0 . 5 4 < 0 . 5 4 < 0 . 5 4 0 . 8 J < 0 . 5 4 0 . 6 1 J < 0 . 5 4 0 . 6 4 J 2 J 0 . 5 9 J < 0 . 5 4 < 0 . 5 4 Th a l l i u m 0 . 0 5 6 0 . 2 8 * 2 0 . 4 7 < 0 . 0 6 J 0 . 1 4 J 0 . 0 5 J 0 . 0 8 J < 0 . 0 5 < 0 . 0 5 0 . 0 6 J 0 . 1 4 J < 0 . 0 5 0 . 1 J 0 . 0 7 J 0 . 0 6 J Va n a d i u m 0 . 3 6 2 5 0. 3 * NE N E 1 . 5 J 1 . 4 J 8 . 9 J 1 . 6 J 2 . 9 J 0 . 9 5 J < 0 . 3 6 1 . 4 J 51 0.81 J 0 . 7 9 J 1 . 1 J Va n a d i u m ( d i s s o l v e d ) 0 . 3 6 2 5 0 . 3 * N E N E < 0 . 3 6 0 . 7 9 J < 0 . 3 6 < 0 . 3 6 0 . 5 9 J < 0 . 3 6 < 0 . 3 6 < 0 . 3 6 < 0 . 3 6 < 0 . 3 6 < 0 . 3 6 < 0 . 3 6 Zi n c 1 . 6 1 1 0 1 0 0 0 5 0 0 0 5 0 1 . 9 J 6 . 1 J 2 . 8 J 3 J 3 . 5 J 4 . 7 J 5 7 2 . 1 J 7 . 4 J 1 . 9 J 6 . 8 J 1 1 No t e : MD L - Me t h o d D e t e c t i o n L i m i t Ta b l e u n i t s a r e p r e s e n t e d i n u g / l . SW S L - So l i d W a s t e S e c t i o n Q u a n t i t a t i o n L i m i t s La b a n a l y s i s b y E n v i r o n m e n t 1 , I n c . r e p o r t d a t e d 1 2 / 1 / 2 0 1 6 , C l i e n t I D # 6 0 0 0 . 2L - Gr o u n d w a t e r S t a n d a r d s ( 1 5 A N C A C 2 L 0 2 0 0 ) GW P - Gr o u n d w a t e r P r o t e c t i o n S t a n d a r d s ( n o t e d b y *) MC L - F e d e r a l M a x i m u m C o n t a m i n a n t L e v e l 2B - NC A C 2 B S t a n d a r d f o r C l a s s C w a t e r s BO L D - De t e c t i o n a b o v e 2 L o r G W P S t a n d a r d J- La b o r a t o r y d e f i n e d c o n c e n t r a t i o n , b e t w e e n M D L a n d S W S L < M D L - No t d e t e c t e d a t o r a b o v e M D L NE - St a n d a r d N o t E s t a b l i s h e d NA - Pa r a m e t e r N o t A n a l y z e d Z:\ P r o j e c t s \ G r o u n d w a t e r M o n i t o r i n g \ 2 . G r o u n d w a t e r M o n i t o r i n g R e p o r t s \ S c o t l a n d \ 2 0 . S c o t l a n d 4 - 1 5 \ 4 - 1 5 - s c o t _ g w _ t a b l e s - 1 Th i s p a g e i n t e n t i o n a l l y l e f t b l a n k . Ta b l e 4 De t e c t e d O r g a n i c C o n s t i t u e n t s Sc o t l a n d C o u n t y L a n d f i l l Oc t o b e r 1 9 , 2 0 1 6 By: MG Date: 12/12/2016 Pa r a m e t e r M D L S W S L 2 L / G W P * M C L 2 B M W - 3 M W - 4 M W - 6 M W - 7 M W - 1 2 M W - 1 3 U p s t r e a m D o w n s t r e a m 1, 1 - D i c h l o r o e t h a n e 0 . 2 0 5 6 N E 1 0 0 1 . 8 J 1 . 5 J 8 0. 5 J 0 . 2 J 2 . 9 J < 0 . 2 < 0 . 2 1, 2 - D i c h l o r o b e n z e n e 0 . 3 2 5 2 0 6 0 0 4 7 0 < 0 . 3 2 < 0 . 3 2 0 . 4 J 0 . 4 J < 0 . 3 2 < 0 . 3 2 < 0 . 3 2 < 0 . 3 2 1, 4 - D i c h l o r o b e n z e n e 0 . 3 9 1 6 7 5 1 0 0 1 1 . 4 13 . 9 1. 2 < 0 . 3 9 2 . 1 < 0 . 3 9 < 0 . 3 9 Ac e t o n e 9 . 0 6 1 0 0 6 0 0 0 N E 2 0 0 2 1 . 4 J < 9 . 0 6 < 9 . 0 6 3 6 . 1 J < 9 . 0 6 < 9 . 0 6 < 9 . 0 6 < 9 . 0 6 Be n z e n e 0 . 2 4 1 1 5 5 1 1. 4 0. 6 J 5. 4 5 . 3 <0 . 2 4 0 . 9 J < 0 . 2 4 < 0 . 2 4 Ca r b o n D i s u l f i d e 0 . 2 3 1 0 0 7 0 0 N E 2 0 0 0 0 < 0 . 2 3 < 0 . 2 3 < 0 . 2 3 < 0 . 2 3 < 0 . 2 3 < 0 . 2 3 < 0 . 2 3 0 . 3 J Ch l o r o b e n z e n e 0 . 3 0 3 5 0 1 0 0 1 4 0 0 . 4 J 0 . 6 J 0 . 7 J 4 . 4 < 0 . 3 0 . 6 J < 0 . 3 < 0 . 3 Ci s - 1 , 2 - D i c h l o r o e t h e n e 0 . 2 5 5 7 0 7 0 4 9 0 0 < 0 . 2 5 1 . 4 J 0 . 4 J < 0 . 2 5 < 0 . 2 5 3 . 1 J < 0 . 2 5 < 0 . 2 5 Di c h l o r o d i f l u o r o m e t h a n e 0. 5 1 5 1 0 0 0 N E N E < 0 . 5 1 < 0 . 5 1 0 . 7 J < 0 . 5 1 < 0 . 5 1 < 0 . 5 1 N A N A Di e l d r i n 0 . 0 4 2 0 . 0 7 5 0 . 0 0 2 N E N E < 0 . 0 4 2 < 0 . 0 4 2 < 0 . 0 4 2 0 . 0 9 7 1 < 0 . 0 4 2 < 0 . 0 4 2 N A N A P- C r e s o l 4 . 1 2 1 0 4 0 N E N E < 4 . 1 2 < 4 . 1 2 < 4 . 1 2 1 0 . 4 6 < 4 . 1 2 < 4 . 1 2 N A N A To l u e n e 0 . 2 3 1 6 0 0 1 0 0 0 1 1 < 0 . 2 3 < 0 . 2 3 < 0 . 2 3 < 0 . 2 3 < 0 . 2 3 < 0 . 2 3 0 . 6 J < 0 . 2 3 Tr i c h l o r o e t h e n e 0 . 2 3 1 3 5 3 0 < 0 . 2 3 0 . 3 J < 0 . 2 3 < 0 . 2 3 < 0 . 2 3 0 . 5 J < 0 . 2 3 < 0 . 2 3 Vi n y l C h l o r i d e 0 . 6 3 1 0 . 0 3 2 2 . 4 3 1 . 2 9 . 2 <0 . 6 3 < 0 . 6 3 2. 1 <0.63 < 0 . 6 3 No t e : MD L - M e t h o d D e t e c t i o n L i m i t T a b l e u n i t s a r e p r e s e n t e d i n u g / l . SW S L - S o l i d W a s t e S e c t i o n Q u a n t i t a t i o n L i m i t s 2L - G r o u n d w a t e r S t a n d a r d s ( 1 5 A N C A C 2 L 0 2 0 0 ) GW P - Gr o u n d w a t e r P r o t e c t i o n S t a n d a r d s ( n o t e d b y *) MC L - F e d e r a l M a x i m u m C o n t a m i n a n t L e v e l BO L D - D e t e c t i o n a b o v e 2 L o r G W P S t a n d a r d J - L a b o r a t o r y d e f i n e d c o n c e n t r a t i o n b e t w e e n M D L a n d S W S L < M D L - N o t d e t e c t e d a t o r a b o v e M D L NE - S t a n d a r d N o t E s t a b l i s h e d NA - P a r a m e t e r N o t A n a l y z e d La b d a t a a n a l y s i s b y E n v i r o n m e n t 1 , I n c . r e p o r t d a t e d 12 / 1 / 2 0 1 6 , C l i e n t I D # 6 0 0 0 . H:\ P r o j e c t s \ G r o u n d w a t e r M o n i t o r i n g \ 2 . G r o u n d w a t e r M o n i t o r i n g R e p o r t s \ S c o t l a n d \ 2 3 . S c o t l a n d 1 0 - 1 6 \ 1 0 - 1 6 - s c o t _ g w _ t a b l e s - u s e . x l s x Ta b l e 5 In d i c a t o r P a r a m e t e r s Sc o t l a n d C o u n t y L a n d f i l l Oc t o b e r 1 9 , 2 0 1 6 By: MG Date: 12/13/2016 Pa r a m e t e r ( u n i t s ) M D L M W - 1 M W - 3 M W - 4 M W - 5 M W - 6 M W - 7 M W - 8 M W - 9 M W - 1 2 M W - 1 3 CO D ( m g / l ) 20 < 2 0 N A N A N A 3 1 3 8 N A < 2 0 2 8 2 3 Ni t r a t e N i t r o g e n ( m g / l ) 0. 0 0 4 3 . 2 9 J N A N A N A < 0 . 0 0 4 0 . 0 4 J N A 0 . 2 0 J < 0 . 0 0 4 < 0 . 0 0 4 To t a l O r g a n i c C a r b o n ( m g / l ) 0. 1 < 0 . 1 N A N A N A 6 . 3 6 . 8 7 N A 2 . 8 7 4 . 8 2 2 . 8 1 To t a l A l k a l i n i t y ( m g / l ) 1 4 N A N A N A 7 8 3 1 5 N A 1 2 1 2 3 9 Ch l o r i d e ( m g / l ) 51 9 N A N A N A 1 2 1 2 N A 1 2 2 2 2 1 Su l f a t e ( m g / l ) 5 1 3 . 3 J N A N A N A 1 6 J < 5 N A 6 6 . 7 J 1 1 7 J 5 6 . 3 J Su l f i d e ( u g / l ) 10 0 < 1 0 0 N A N A N A 3 2 3 J < 1 0 0 N A < 1 0 0 < 1 0 0 < 1 0 0 Di s s o l v e d O x y g e n ( m g / l ) 0. 1 6 . 0 5 0 . 4 9 0 . 2 9 5 . 9 8 0 . 2 8 0 . 5 4 5 . 6 8 1 . 1 4 4 . 0 4 0 . 4 2 OR P ( M V ) NE 1 1 7 6 6 5 1 6 5 3 1 - 2 9 1 7 7 1 2 4 2 1 4 7 2 Me t h a n e ( u g / l ) 0. 0 3 7 1 . 5 N A N A N A 1 0 0 0 0 1 2 0 0 0 N A 3 9 0 2 8 0 1 7 0 No t e : MD L = M e t h o d D e t e c t i o n L i m i t J = L a b o r a t o r y d e f i n e d a s b e t w e e n M D L a n d S W S L l i m i t O R b e t w e e n t h e M D L a n d P Q L ( P r a c t i c a l Q u a n t i t a t i o n L i m i t ) . No n - d e t e c t s a r e p r e s e n t e d a s < M D L v a l u e NA = P a r a m e t e r N o t A n a l y z e d La b d a t a a n a l y s i s b y E n v i r o n m e n t 1 , I n c . r e p o r t d a t e d 5 / 3 1 / 2 0 1 6 , C l i e n t I D # 6 0 0 0 a n d M i c r o s e e p s / P a c e A n a l y t i c a l E n e r g y Se r v i c e s w o r k o r d e r # 1 8 7 7 5 H:\ P r o j e c t s \ G r o u n d w a t e r M o n i t o r i n g \ 2 . G r o u n d w a t e r M o n i t o r i n g R e p o r t s \ S c o t l a n d \ 2 3 . S c o t l a n d 1 0 - 1 6 \ 1 0 - 1 6 - s c o t _ g w _ t a b l e s - u s e . x l s x Ta b l e 6 St a t i s t i c a l A n a l y s i s S u m m a r y Sc o t l a n d C o u n t y L a n d f i l l Oc t o b e r 1 9 , 2 0 1 6 By: MG Date: 12/13/2016 Mo n i t o r i n g W e l l P a r a m e t e r R e s u l t 2 L / G W P * T e s t U n i t % N D T e s t St a t i s t i c a l l y Si g n i f i c a n t ? MW - 4 A r s e n i c 1 0 1 0 u g / l 5 8 . 5 8 P P L N MW - 1 2 C h r o m i u m 1 4 1 0 u g / l 5 7 . 9 4 P P L N MW - 6 I r o n 29 6 9 7 30 0 u g /l 0 W i l c o x o n N MW - 7 I r o n 11 2 0 8 1 30 0 u g /l 0 W i l c o x o n N MW - 9 I r o n 69 0 4 30 0 u g /l 0 W i l c o x o n N MW - 1 2 V a n a d i u m 51 0. 3 * u g /l 5 0 . 2 1 P P L N No t e s : %N D M e t h o d c h o s e n d u e t o p e r c e n t n o n - d e t e c t s PP L P a r a m e t r i c P r e d i c t i o n L i m i t ( I n t e r - W e l l ) Wi l c o x o n W i l c o x o n R a n d I n d i v i d u a l W e l l T e s t ( I n t r a - w e l l ) Bo l d i n d i c a t e s s t a t i s t i c a l s i g n i f i c a n c e La b a n a l y s i s b y E n v i r o n m e n t 1 , I n c . r e p o r t d a t e d 1 2 / 1 / 2 0 1 6 , C l i e n t I D # 6 0 0 0 . MW - 1 a n d M W - 8 a r e u s e d a s s i t e b a c k g r o u n d w e l l s H: \ P r o j e c t s \ G r o u n d w a t e r M o n i t o r i n g \ 2 . G r o u n d w a t e r M o n i t o r i n g R e po r t s \ S c o t l a n d \ 2 3 . S c o t l a n d 1 0 - 1 6 \ 1 0 - 1 6 - s c o t _ g w _ t a b l e s - u s e . x l s x Ta b l e 7 Co n d u c t i v i t y a n d V e l o c i t y C a l c u l a t i o n s Sc o t a l a n d C o u n t y L a n d f i l l Oc t o b e r 1 9 , 2 0 1 6 By: MG Date: 12/22/2016 We l l Gr o u n d w a t e r El e v a t i o n (f e e t ) Hy d r a u l i c Co n d u c t i v i t y (f t / d a y ) Po r o s i t y ( % ) G r a d i e n t Ve l o c i t y (f t / d a y ) MW - 1 1 8 7 . 4 8 6 . 8 0 . 2 0 . 0 2 6 9 0 . 9 1 5 MW - 2 1 7 5 . 3 7 6 . 1 2 0 . 2 0 . 0 1 2 6 0 . 3 8 6 MW - 3 1 7 1 . 3 2 1 4 . 2 9 0 . 1 8 0 . 0 1 4 7 1 . 1 6 4 MW - 4 1 6 8 . 5 0 2 3 . 1 3 0 . 2 1 0 . 0 1 1 1 1 . 2 2 4 MW - 5 1 8 1 . 3 9 1 8 . 0 3 0 . 2 1 0 . 0 0 7 6 0 . 6 5 5 MW - 6 1 7 0 . 6 4 1 3 . 2 7 0 . 1 8 0 . 0 1 1 6 0 . 8 5 8 MW - 7 1 7 7 . 9 3 7 . 4 8 0 . 1 5 0 . 0 7 7 2 3 . 8 5 0 MW - 8 1 8 7 . 7 2 7 . 8 2 0 . 2 0 . 0 3 4 4 1 . 3 4 5 Av e r a g e V e l o c i t y ( f t / d a y ) 1. 2 9 9 No t e : Ve l o c i t y C a l c u l a t e d f r o m V = K * I / n V = v e l o c i t y K = H y d r a u l i c C o n d u c t i v i t y I = G r a d i e n t n = P o r o s i t y Hy d r a u l i c C o n d u c t i v i t y v a l u e s f r o m 4 / 4 / 9 4 G A I C o n s u l t a n t s I n c . r e p o r t Es t i m a t e d p o r o s i t y v a l u e s a s s u m e d f r o m G r o u n d w a t e r a n d W e l l s ( D r i s c o l l ) Wa t e r l e v e l d a t a c o l l e c t e d b y E n v i r o n m e n t 1 p e r s o n n e l . N/ A = D a t a N o t A v a i l a b l e H: \ P r o j e c t s \ G r o u n d w a t e r M o n i t o r i n g \ 2 . G r o u n d w a t e r M o n i t o r i n g R e p o r t s \ S c o t l a n d \ 2 3 . S c o t l a n d 1 0 - 1 6 \ 1 0 - 1 6 - s c o t _ g w _ t a b l e s - u s e . x l s x APPENDIX A Monitoring Well Information October 2016 Groundwater Monitoring Report Scotland County Landfill Soild Waste Permit No. 83-01 This page intentionally left blank. FIELD BOREHOLE LOG BOREHOLE NUMBER PROJECT NAME: LOCATION: DRILLING CO: DRILLING METHOD: FIELD PARTY: GEOLOGIST: DATE BEGUN: COMPLETED: TOTAL DEPTH: TOP OF CASING ELEV.: Depth (ft) Time Date STATIC WATER LEVEL (BLS) DE P T H BL O W C O U N T SA M P L I N G M E T H O D RE C O V E R Y DR I L L M E T H O D DESCRIPTION LI T H O L O G Y WE L L IN S T A L L A T I O N 0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 DE P T H Richardson Smith Gardner & Assoc 14 North Boylan Avenue, Raleigh NC 27603 (919) 828-0577 Page 1 of 1 GROUND ELEV.: NORTHING:EASTING:0 0 MW-12 HSA Scotland County Landfill Laurinburg, NC Zebra Environmental, Inc. Dan Ferrell J. Smyth 8/26/09 8/27/09 35 GRAB GRAB GRAB GRAB GRAB GRAB HSA SOIL: Dark brown dry topsoil SILTY SAND: Dry, brown to red silty F-M sand. CLAYEY SILTY SAND: Dry, tan brown clayey silty F-M sand. SILTY SAND: Dry, red brown to tan silty F-M sand. SILTY SAND: Moist, light tan silty F-M sand grading to silty F sand at 25 feet. SILTY SAND: Wet, Light tan, silty fF sand. B.T. at 35 feet. NA NA NA NA NA NA FIELD BOREHOLE LOG BOREHOLE NUMBER PROJECT NAME: LOCATION: DRILLING CO: DRILLING METHOD: FIELD PARTY: GEOLOGIST: DATE BEGUN: COMPLETED: TOTAL DEPTH: TOP OF CASING ELEV.: Depth (ft) Time Date STATIC WATER LEVEL (BLS) DE P T H BL O W C O U N T SA M P L I N G M E T H O D RE C O V E R Y DR I L L M E T H O D DESCRIPTION LI T H O L O G Y WE L L IN S T A L L A T I O N 0.0 5.0 10.0 0.0 5.0 10.0 DE P T H Richardson Smith Gardner & Assoc 14 North Boylan Avenue, Raleigh NC 27603 (919) 828-0577 Page 1 of 1 GROUND ELEV.: NORTHING:EASTING:0 0 MW-13 HSA Scotland County Landfill Laurinburg, NC Zebra Environmental, Inc. Dan Ferrell J. Smyth 8/26/09 8/27/09 14.5 GRAB GRAB GRAB HSA SOIL: Dark brown dry topsoil SILTY SAND: Wet, black to gray silty F-M sand to sandy silt. SILTY SAND: Wet, Light tan silty F-C sand. B.T. @ 14.5 feet. NA NA NA NA NA NA APPENDIX B Laboratory Analytical Report October 2016 Groundwater Monitoring Report Scotland County Landfill Soild Waste Permit No. 83-01 This page intentionally left blank. APPENDIX C Time vs. Concentration Graphs October 2016 Groundwater Monitoring Reports Scotland County Landfill Solid Waste Permit No. 83-01 This page intentionally left blank. Pa g e 1 1, 1 - D i c h l o r o e t h a n e Ti m e - S e r i e s G r a p h o f M W - 6 Sa m p l e D a t e C o n c e n t r a t i o n ( p p b ) 010203040506070 1 / 5 / 1 9 9 4 4 / 8 / 1 9 9 7 7 / 1 0 / 2 0 0 0 1 0 / 1 2 / 2 0 0 3 1 / 1 3 / 2 0 0 7 4 / 1 6 / 2 0 1 0 7/18/2013 10/19/2016 Pa g e 1 1, 4 - D i c h l o r o b e n z e n e Ti m e - S e r i e s G r a p h o f M W - 6 Sa m p l e D a t e C o n c e n t r a t i o n ( p p b ) 05101520 1 / 5 / 1 9 9 4 4 / 8 / 1 9 9 7 7 / 1 0 / 2 0 0 0 1 0 / 1 2 / 2 0 0 3 1 / 1 3 / 2 0 0 7 4 / 1 6 / 2 0 1 0 7/18/2013 10/19/2016 Pa g e 1 Ar s e n i c , t o t a l Ti m e - S e r i e s G r a p h o f M W - 4 Sa m p l e D a t e C o n c e n t r a t i o n ( p p b ) 051015202530 1 / 5 / 1 9 9 4 4 / 8 / 1 9 9 7 7 / 1 0 / 2 0 0 0 1 0 / 1 2 / 2 0 0 3 1 / 1 3 / 2 0 0 7 4 / 1 6 / 2 0 1 0 7/18/2013 10/19/2016 Pa g e 1 Be n z e n e Mu l t i - W e l l T i m e - S e r i e s G r a p h Sa m p l e D a t e C o n c e n t r a t i o n ( p p b ) 0123456789 MW - 3 MW - 6 MW - 7 1 / 5 / 1 9 9 4 4 / 8 / 1 9 9 7 7 / 1 0 / 2 0 0 0 1 0 / 1 2 / 2 0 0 3 1 / 1 3 / 2 0 0 7 4 / 1 6 / 2 0 1 0 7/18/2013 10/19/2016 Pa g e 1 Ch r o m i u m , t o t a l Ti m e - S e r i e s G r a p h o f M W - 1 2 Sa m p l e D a t e C o n c e n t r a t i o n ( p p b ) 01020304050 1 0 / 1 3 / 2 0 0 9 1 0 / 1 4 / 2 0 1 0 1 0 / 1 5 / 2 0 1 1 1 0 / 1 5 / 2 0 1 2 1 0 / 1 6 / 2 0 1 3 1 0 / 1 7 / 2 0 1 4 10/18/2015 10/19/2016 Pa g e 1 Ir o n , t o t a l Mu l t i - W e l l T i m e - S e r i e s G r a p h Sa m p l e D a t e C o n c e n t r a t i o n ( p p b ) 0 50 0 0 0 10 0 0 0 0 15 0 0 0 0 20 0 0 0 0 MW - 6 MW - 7 MW - 9 4 / 2 6 / 2 0 1 0 3 / 3 0 / 2 0 1 1 3 / 2 / 2 0 1 2 2 / 3 / 2 0 1 3 1 / 8 / 2 0 1 4 1 2 / 1 2 / 2 0 1 4 11/15/2015 10/19/2016 Pa g e 1 Va n a d i u m Ti m e - S e r i e s G r a p h o f M W - 1 2 Sa m p l e D a t e C o n c e n t r a t i o n ( p p b ) 050 10 0 15 0 20 0 1 0 / 1 3 / 2 0 0 9 1 0 / 1 4 / 2 0 1 0 1 0 / 1 5 / 2 0 1 1 1 0 / 1 5 / 2 0 1 2 1 0 / 1 6 / 2 0 1 3 1 0 / 1 7 / 2 0 1 4 10/18/2015 10/19/2016 Pa g e 1 Vi n y l c h l o r i d e Mu l t i - W e l l T i m e - S e r i e s G r a p h Sa m p l e D a t e C o n c e n t r a t i o n ( p p b ) 01020304050 MW - 3 MW - 4 MW - 6 MW - 1 3 1 / 5 / 1 9 9 4 4 / 8 / 1 9 9 7 7 / 1 0 / 2 0 0 0 1 0 / 1 2 / 2 0 0 3 1 / 1 3 / 2 0 0 7 4 / 1 6 / 2 0 1 0 7/18/2013 10/19/2016