Wednesday, October 19, :19 AM

Transcription

1 Spakes, Rita From: Sent: To: Subject: Attachments: Rec d Digitally AFIN: PMT#: 0254-S1-R4 S By spakes at 12:58 pm, Oct 19, 2016 W Hynum, Tammie DOC ID#: M Wednesday, October 19, :19 AM D TO: BS>FILE <RDS Sadler, Bill; Rich, Jay FW: Alternative Source Demonstration, Craighead County Class 1 Landfill, Solid Waste Permit No S1-R4 TM-T Hynum pdf From: Dana Derrington [mailto:dld@ftn-assoc.com] Sent: Wednesday, October 19, :17 AM To: Hynum, Tammie Subject: Alternative Source Demonstration, Craighead County Class 1 Landfill, Solid Waste Permit No S1-R4 Hello Tammie, I have attached an Alternative Source Demonstration in response to confirmed SSIs during the first half of 2016 for the Craighead County Class 1 Landfill. Please contact me with any questions. Regards, Dana Dana Derrington, PE *, PG * FTN Associates, Ltd. 3 Innwood Circle, Ste.220 Little Rock, AR Office: (501) Cell: (501) * Missouri and Arkansas 1

2 TECHNICAL MEMORANDUM DATE: October 19, 2016 TO: FROM: SUBJECT: Tammie J. Hynum Office of Land Resources, Arkansas Department of Environmental Quality Dana Derrington, PE, PG FTN Associates, Ltd. Alternative Source Demonstration for Statistically Significant Increases Craighead County Class 1 Landfill, Solid Waste Permit No S1-R4 FTN No. R On behalf of the Craighead County Solid Waste Disposal Authority (CCSWDA), FTN Associates, Ltd. (FTN) is submitting an Alternate Source Demonstration (ASD) for the Legacy Class 1 Landfill. This ASD is being submitted to address statistically significant increases (SSIs) from the first half of 2016 groundwater monitoring period in accordance with Arkansas Pollution Control and Ecology Commission Regulation No. 22, (c)(3). 1.0 BACKGROUND In April 2016, FTN performed groundwater sampling for the first half 2016 semiannual groundwater monitoring report (DIN 69968). Statistical analysis using intrawell prediction limits indicated SSIs for chloride and barium at upgradient MW-14R, and for chromium at upgradient MW-17R and MW-20. Iron at MW-14R and chromium at MW-17R were indicated as SSIs based on Mann-Kendall/Sen s estimate of slope trend analysis. A site map showing the locations of these wells and the typical groundwater flow direction (which is to the west-southwest across the site) is included as Figure 1 (Attachment 1). Verification sampling was performed by FTN on August 2 and 3, 2016, and confirmed each of the SSIs indicated above, as summarized in Table 1. The laboratory report was submitted to the Arkansas Department of Environmental Quality by ESC Lab Sciences (ESC) (DIN 70229) and by FTN via (from Dana Derrington to Tammie Hynum on September 9, 2016). It should be noted that ESC inadvertently analyzed the metals using SW method 6010 as opposed to SW-846 method 6020, which has a lower method detection limit (MDL) and laboratory practical quantitation limit (PQL). FTN contacted ESC regarding this error after the results were received, but the laboratory could not correct the results. This resulted in the detection at MW-17R being flagged with a J, indicating that 1 EPA s Test Methods for Evaluating Solid Waste - Physical/Chemical Methods (SW-846). Regional Offices: Fayetteville, AR; Baton Rouge, LA ftn@ftn-assoc.com

3 Tammie J. Hynum October 19, 2016 Page 2 chromium was detected below the PQL, and the result is therefore estimated. Under Regulation No. 22, results of this type are not required for statistical analysis so the confirmation of the SSI is qualified. Table 1. Verification results for first half of 2016 SSIs. April 2016 Observation (mg August 2016 Verification (mg Confirmed SSI? Well ID Parameter Statistical Test (a) MW-14R Barium PL ( mg Yes MW-14R Chloride PL (38.77 mg Yes MW-14R Iron Trend (increasing) Yes MW-17R Chromium PL ( mg (J) Yes (b) MW-19 Chromium Trend (increasing) Yes MW-20 Chromium PL ( mg Yes a. PL = prediction limit; value in parenthesis is the intrawell prediction limit. Trend = trend test using the Mann-Kendall/Sen's Slope estimator. b. The result is below the laboratory PQL and considered estimated. The confirmation of the SSI is qualified. 2.0 BARIUM, CHLORIDE, AND IRON AT MW-14R Terracon submitted an ASD in June 2011 due to SSIs for barium and chloride in MW-14R (DIN 60141). Terracon stated that the concentration of barium in MW-14R (0.28 mg was well below the EPA maximum contaminant level (MCL) of 2 mg/l and noted that barium was reported in similar concentrations both upgradient and of the landfill. Terracon also stated that the chloride concentration at MW-14R of 4 mg/l 2 during the first half of 2011 was well below the secondary MCL (SMCL) of 250 mg/l. Further, Terracon stated that SMCL exceedances affect the aesthetic qualities of drinking water such as taste, odor, color, and appearance and are not federally enforced. Terracon concluded that because MW-14R is located upgradient of the waste mass, elevated barium and chloride concentrations are likely attributable to the natural variability of the groundwater or an offsite source. While ADEQ issued a response to the 2011 ASD (DIN 61656), it is unclear if the response was an approval of Terracon s findings. As indicated by Figure 1, the location of MW-14R is more than 600 ft upgradient of the limits of the permitted waste boundary, so attribution of the SSIs for barium, chloride, and iron to the landfill is technically problematic. Detected barium at this location continues to be well below the MCL and is within published levels for wells screened in similar sediments. For example, the landfill is located in the Pleistocene valley train deposits of the Mississippi River Valley alluvial aquifer as shown on 2 Please note that this value was reported incorrectly in Terracon s ASD. The value reported by the laboratory was 47 mg/l, which ADEQ pointed out in its response to the ASD (DIN 61656).

4 Tammie J. Hynum October 19, 2016 Page 3 Figure 2 (Attachment 2). According to Gonthier (2003), groundwater in these sediments had respective median and maximum concentrations of mg/l and mg/l for barium based on 29 sampled wells. Similarly, iron had a median concentration of 3.8 mg/l and a maximum of 10.7 mg/l, and chloride had a median concentration of 8.9 mg/l with a maximum of 230 mg/l. In consideration of the upgradient location of MW-14R and the fact that detected levels for barium, chloride, and iron are within published levels, the SSIs at this well are considered to be the result of offsite influences. 3.0 CHROMIUM AT MW-17R, MW-19, AND MW-20 Chromium at upgradient well MW-14R has been detected at similar levels to those that triggered the SSIs at MW-17R, MW-19, and MW-20, as summarized in Table 2. While not always a predictor, elevated turbidity is often times associated with elevated metals such as chromium. Two of the elevated chromium measurements at MW-14R were from a sample with elevated turbidity, as shown in Table 2. Table 2. Select chromium and turbidity values measured at upgradient MW-14R. Date Turbidity (NTUs*) Chromium (mg 04/01/ /17/ /05/ /06/ *Nephelometric turbidity units The relationship between elevated turbidity and metals is well documented (e.g., Puls and Barcelona 1996) and can bias metals results. The facility Groundwater Sampling and Analysis Plan (GWSAP) (DIN 61939) and subsequent groundwater monitoring reports (DINs 66777, 68951, and 69968) have documented the recurring problem of poor sample clarity and aquifer recharge at the landfill s wells. Many of the metals data are flagged with an R in the historical database and are excluded from statistical analysis because they are associated with elevated turbidity and are not considered representative of groundwater quality (Attachment 2). Rather, these data suggest that chromium is sorbed to particles in the aquifer matrix and are otherwise immobile in groundwater. Deteriorating sample quality at the landfill is likely due to withdrawal pressures on the aquifer by the surrounding agricultural industry, as documented in the landfill s GWSAP and publications by Schrader (2015) and Kresse et al. (2014). The regional decline has been observed at the landfill and has caused the repeated need to install replacement wells due to poor recharge, poor sample clarity, and lack of water column. For example, the original monitoring well MW-17 had a water level of approximately 92 ft below ground surface (bgs) in Its replacement well, installed in the same general location and elevation, now has a water level of approximately 120 ft bgs, a nearly 30-ft drop in head.

5 Tammie J. Hynum October 19, 2016 Page 4 None of the chromium levels that triggered the SSIs exceed the MCL of 0.1 mg/l. Levels at MW-17R, MW-19, and MW-20 are within or similar to measurements at upgradient MW-14R, even when considering those associated with a sample turbidity of 10 NTUs or less [as required by (a)]. As such, the SSIs are considered to be a symptom of the overall decline in groundwater quality in the region (Schrader 2015, Kresse et al. 2014) as opposed to impact from landfilling activities. 4.0 SUMMARY Based on a review of published information and the upgradient position of MW-14R, it is difficult to attribute the SSIs of barium, chloride, and iron at this well to the waste mass at the facility. Our conclusion, and the conclusion of others with respect to chloride and barium, is that these increases are due to offsite influence. Chromium levels at MW-17R, MW-19, and MW-20 are below the MCL of 0.1 mg/l and are generally within or similar to levels measured at upgradient MW-14R. Elevated chromium is often linked to sample turbidity at the landfill. Poor recharge and lack of sample clarity have been chronic problems at the landfill due to regional stresses on the aquifer. At this time, the SSIs for chromium are considered to be indicative of the overall decline of the aquifer as opposed to landfilling activities. Based on these findings, it is recommended that the landfill continue with detection monitoring per the requirements of Regulation No. 22 and the facility s permit. CCSWDA would appreciate an expeditious review of this memorandum and requests that ADEQ provide a response to each of the parameters discussed herein. If you have any questions or comments regarding groundwater quality this issue, please do not hesitate to call Dana Derrington, PE, PG, at (501) or Paul Crawford, PE, PG, at (501) DLD/hlf Attachments CC: Robert Hendrix; Craighead County Solid Waste Disposal Authority (with attachments) Angela Sparks; Craighead County Solid Waste Disposal Authority (with attachments) R:\WP_FILES\ \CORRESPONDENCE\L-T HYNUM ALTERNATE SOURCE DEMONSTRATION\ TM-T HYNUM DOCX

6 Tammie J. Hynum October 19, 2016 Page 5 SELECTED REFERENCES FTN Second Half of 2014 Semiannual Groundwater Monitoring Report, Craighead County Legacy Class 1 Landfill, Jonesboro, AR, Permit No S1-R4 [ADEQ DIN 66777]. Little Rock, AR: FTN Associates, Ltd. November 19, FTN. 2016a. First Half of 2016 Semiannual Groundwater Monitoring Report, Craighead County Legacy Class 1 Landfill, Jonesboro, AR, Permit No S1-R4 [ADEQ DIN 69968]. Little Rock, AR: FTN Associates, Ltd. July 13, FTN. 2016b. Second Half of 2015 Semiannual Groundwater Monitoring Report, Craighead County Legacy Class 1 Landfill, Jonesboro, AR, Permit No S1-R4 [ADEQ DIN 68951]. Little Rock, AR: FTN Associates, Ltd. February 25, Gonthier, G.J Quality of groundwater in Pleistocene and Holocene subunits of the Mississippi River Alluvial Aquifer, 1998 [Water-Resources Investigations Report ]. Jackson, MS: US Geological Survey, National Water-Quality Assessment Program. Kresse, T.M., P.D. Hays, K.R. Merriman, J.A. Gillip, D.T. Fugitt, J.L. Spellman, A.M. Nottmeier, D.A. Westerman, J.M. Blackstock, and J.L. Battreal Aquifers of Arkansas Protection, management, and hydrologic and geochemical characteristics of groundwater resources in Arkansas [Scientific Investigations Report ]. Prepared in cooperation with the Arkansas Natural Resources Commission. Reston, VA: US Geological Survey. 334 pp. doi: Puls, R.W., and M.J. Barcelona Low-Flow (Minimal Drawdown) Ground-Water Sampling Procedures [EPA 540/S-95/504]. Washington, DC: US Environmental Protection Agency, Office of Solid Waste and Emergency Response. Schrader, T.P Water levels and water quality in the Mississippi River Valley alluvial aquifer in eastern Arkansas, 2012 [Scientific Investigations Report ]. Prepared in cooperation with the Arkansas Natural Resources Commission and the Arkansas Geological Survey. Little Rock, AR: US Geological Survey. doi: Terracon Consultants, Inc Alternative Source Demonstration First Half 2011 Groundwater Monitoring Event, Legacy Class 1 Landfill, Permit No. 254-S1-R3 [ADEQ DIN 60141]. Little Rock, AR: Terracon Consultants, Inc.

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8 ATTACHMENT 1 Figures

9 Figure 1. Potentiometric surface map, April 12, 2016.

10 LEGACY LANDFILL LOCATION R:\cad\ \dwg\fig-1 Figure 2. Surface geology of Craighead County (adapted from Kresse et al. 2014).

11 ATTACHMENT 2 Historical Database

12 s N (mg Ammonia as g Calcium (mg COD (mg g Chloride (mg Iron (mg (mg Manganese Sodium (mg Sulfate (mg/ Antimony (m mg Arsenic (mg/ Barium (mg/ MW 6 3/16/ < < <0.006 <0.005 <1 <0.004 <0.005 <0.005 <1 <0.03 <0.015 n/a <1 <0.005 <0.05 5/23/ <0.006 <0.005 <1 <0.004 <0.005 <0.05 <0.03 < n/a <0.05 <0.005 <0.05 6/29/ <0.006 <0.005 <1 <0.004 <0.005 <0.05 <0.03 <0.03 <0.015 n/a <0.1 <0.005 <0.05 7/25/ < < < <1 < < < < < < n/a <0.1 < < /8/ < <0.014 <0.008 <1 <0.004 <0.005 <0.05 <0.03 <0.03 <0.015 n/a <0.1 <0.008 <0.05 8/6/1996 < < <0.006 <0.01 <1 <0.004 <0.005 <0.05 <0.02 < n/a <0.05 <0.01 <0.05 2/26/1997 < <0.006 <0.01 <1 <0.004 <0.005 <0.05 <0.02 < n/a <0.05 <0.01 <0.05 9/10/ <0.006 <0.01 <1 <0.004 <0.005 <0.05 <0.02 <0.03 <0.015 n/a <0.05 <0.02 <0.05 MW 6R 9/23/1998 < <0.006 <0.005 <0.1 <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 3/16/1999 < < <0.006 <0.005 <0.1 <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/29/ <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a < <0.01 3/14/2000 < < <0.006 < <0.002 <0.003 <0.01 <0.01 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/20/2000 < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 3/21/2001 < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/26/ < (O) (O) <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.005 <0.01 3/27/2002 < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/25/2002 < < (O) <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 4/1/ < <0.006 < <0.002 <0.003 <0.01 < <0.005 n/a <0.01 <0.01 <0.01 9/17/ < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 3/24/ < < < < < < < < < n/a < < < /14/2004 n/a n/a n/a n/a 104 <0.006 < <0.004 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 3/9/2005 n/a n/a n/a n/a 62.6 <0.006 <0.005 <0.01 <0.002 <0.003 <0.005 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/28/2005 n/a n/a n/a n/a 81.2 <0.002 < < <0.02 < n/a <0.01 <0.003 < /15/2006 n/a n/a n/a n/a 81.2 < < < <0.02 <0.002 <0.001 n/a (O) <0.003 < /20/2006 n/a n/a n/a n/a 87.9 <0.002 < <5E 05 < < <0.1 <0.002 <0.001 n/a <0.005 <0.005 < /6/2007 n/a n/a n/a n/a 73.6 <0.002 < <5E 05 < < <0.02 <0.002 <0.001 n/a <0.002 <0.003 < /19/2007 n/a n/a n/a 22 < n/a 130 < < < < < <0.005 < n/a < < /1/2008 n/a n/a n/a 24.9 < n/a 82.4 < < < < < < n/a < < /18/2008 n/a n/a n/a < n/a 92.4 < < < < < n/a <0.001 < /17/2009 n/a n/a n/a (R) 0.33(R) n/a 72.1 < (R) 0.198(R) < < (R) < (R) (R) n/a (R) <0.001 < /7/2009 n/a n/a n/a (O) n/a 132 < < < < E 05 n/a <0.001 < /16/2010 n/a n/a n/a n/a 73.1 < < < < <0.001 < < n/a <0.002 < /28/2010 n/a n/a n/a n/a 96.8 < < < < <0.001 < < n/a <0.002 < /13/2012 n/a n/a n/a n/a 88 < <0.001 < <0.01 < n/a < <0.01 9/26/2012 n/a n/a n/a n/a 87 < <0.001 < <0.01 <0.01 <0.002 <0.001 n/a <0.02 <0.001 <0.01 3/5/2014 n/a n/a n/a n/a 74 < < n/a < /9/2014 n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a MW 8 3/16/ < < <0.006 <0.005 <1 <0.004 <0.005 <0.005 <0.1 <0.03 <0.015 n/a <1 <0.005 <0.05 5/23/ (O) <0.006 <0.005 <1 <0.004 <0.005 <0.05 <0.03 <0.03 <0.015 n/a <0.05 <0.005 <0.05 6/29/ <0.006 <0.005 <1 <0.004 <0.005 <0.05 <0.03 <0.03 <0.015 n/a <0.1 <0.005 <0.05 7/25/ < <0.006 <0.005 <1 <0.004 <0.005 <0.05 <0.03 <0.03 <0.015 n/a <0.1 <0.005 <0.05 2/8/1996 < < <0.014 <0.008 <1 <0.004 <0.005 <0.05 <0.03 < n/a <0.1 <0.008 <0.05 8/6/ < <0.006 <0.01 <1 <0.004 <0.005 <0.05 <0.02 <0.03 <0.015 n/a <0.05 <0.01 <0.05 2/26/1997 / < < (R) 0.53(R) <0.006 <0.01 <1 <0.004 <0.005 <0.05 <0.02 < (R) n/a <0.05 <0.01 <0.05 9/10/ <0.006 <0.01 <1 <0.004 <0.005 <0.05 <0.02 <0.03 <0.015 n/a <0.05 <0.02 <0.05 4/9/ < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/23/1998 < <0.006 <0.005 <0.1 <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 R flag indicates value is rejected; not used in statistical analyses. 1 of 24 Beryllium (m mg Cadmium (m mg mg Chromium ( L) Cobalt (mg/ Copper (mg/ Lead (mg g/l) Mercury (mg L) Nickel (mg/l Selenium (m mg ) Silver (mg/l

13 s N (mg Ammonia as g Calcium (mg COD (mg g Chloride (mg Iron (mg (mg Manganese Sodium (mg Sulfate (mg/ Antimony (m mg Arsenic (mg/ Barium (mg/ MW 8 (cont.) 3/16/1999 < < <0.006 <0.005 <0.1 <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/29/ < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 3/14/2000 < < <0.006 < <0.002 <0.003 <0.01 <0.01 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/20/2000 < < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 3/21/2001 < < < < < < < < < < n/a < < < /26/2001 < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.005 <0.01 3/27/ < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/25/ < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 4/1/2003 < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/17/2003 < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 3/24/ < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/14/2004 n/a n/a n/a n/a 36.7 <0.006 < <0.004 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 3/9/2005 n/a n/a n/a n/a 42.5 <0.006 < <0.002 <0.003 <0.005 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/28/2005 n/a n/a 45.2(O) 355 <0.002(O) < < <0.02 <0.002 <0.001 <0.01 <0.003 n/a < <0.001 < /15/2006 n/a n/a n/a n/a 49.7 < < < <0.02 <0.002 <0.001 n/a <0.003 < /20/2006 n/a n/a n/a n/a 65.5 <0.002 < <5E 05 < < <0.1 <0.002 <0.001 n/a <0.005 <0.005 < /6/2007 n/a n/a n/a n/a 46.3 <0.002 < <5E 05 < <0.02 <0.002 <0.001 n/a <0.003 < /19/2007 n/a n/a n/a 26 < n/a 60.9 < < < < < < < n/a < < /1/2008 n/a n/a n/a 24.9 < n/a 44.8 < < < < < <0.001 < n/a < < /18/2008 n/a n/a n/a < n/a 34.8 < < < < < n/a <0.001 < /17/2009 n/a n/a n/a (R) (R) n/a 80.6 < (R) 0.141(R) < < (R) < (R) < n/a (R) <0.001 < /7/2009 n/a n/a n/a n/a 48 < < E E n/a < < /16/2010 n/a n/a n/a n/a 37.5 < < < <0.001 < n/a <0.002 < /28/2010 n/a n/a n/a n/a 39.8 < < < < n/a <0.002 < /26/2012 n/a n/a n/a (R) 0.27(R) n/a 34 < (R) 0.16(R) <0.001 < (R) < (R) <0.001 n/a <0.02 <0.001 <0.01 3/5/2014 n/a n/a n/a n/a 41 < < (J) (J) n/a < /16/2015 n/a n/a n/a n/a 25.2 < <0.002 < (J) <0.005 <0.002 n/a <0.002 <0.002 MW 9 3/16/ < <0.006 <0.005 <1 <0.004 <0.005 <0.005 <0.1 <0.03 <0.015 n/a <0.1 <0.005 <0.05 5/23/ <0.006 <0.005 <1 <0.004 <0.005 <0.05 <0.03 <0.03 <0.015 n/a <0.05 <0.005 <0.05 6/29/ <0.006 <0.005 <1 <0.004 <0.005 <0.05 <0.03 <0.03 <0.015 n/a <0.1 <0.005 <0.05 7/25/ < <0.006 <0.005 <1 <0.004 <0.005 <0.05 <0.03 <0.03 <0.015 n/a <0.1 <0.005 <0.05 2/8/ <0.014 <0.008 <1 <0.004 <0.005 <0.05 <0.03 <0.03 <0.015 n/a <0.1 <0.008 <0.05 8/6/ < <0.006 <0.01 <1 <0.004 <0.005 <0.05 <0.02 < n/a <0.05 <0.01 <0.05 2/26/1997 < < <0.006 <0.01 <1 <0.004 <0.005 <0.05 <0.02 < n/a <0.05 <0.01 <0.05 9/10/ < <0.006 <0.01 <1 <0.004 <0.005 <0.05 <0.02 <0.03 <0.015 n/a <0.05 <0.02 <0.05 4/9/ < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/23/1998 < <0.006 <0.005 <0.1 <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 3/16/1999 < < < < <0.1 < < < < < < n/a < < < /29/ < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 3/14/2000 < < <0.006 <0.005 <0.1 <0.002 <0.003 <0.01 <0.01 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/20/2000 < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 3/21/2001 < < < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/26/ < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.005 <0.01 3/27/2002 < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/25/2002 < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 4/1/2003 / < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/17/ < <0.006 < <0.002 < < <0.005 n/a <0.01 <0.01 <0.01 3/24/2004 < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/14/2004 n/a n/a n/a n/a 22.4 <0.006 < <0.004 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 R flag indicates value is rejected; not used in statistical analyses. 2 of 24 Beryllium (m mg Cadmium (m mg mg Chromium ( L) Cobalt (mg/ Copper (mg/ Lead (mg g/l) Mercury (mg L) Nickel (mg/l Selenium (m mg ) Silver (mg/l

14 s N (mg Ammonia as g Calcium (mg COD (mg g Chloride (mg Iron (mg (mg Manganese Sodium (mg Sulfate (mg/ Antimony (m mg Arsenic (mg/ Barium (mg/ MW 9 (cont.) 3/9/2005 n/a n/a n/a n/a 22 <0.006 < <0.002 <0.003 <0.005 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/28/2005 n/a n/a n/a n/a 22.3 <0.002 < < <0.02 <0.002 <0.001 n/a <0.01 <0.003 < /15/2006 n/a n/a n/a n/a 24.1 < < < <0.02 < n/a <0.003 < /20/2006 n/a n/a n/a n/a 32.9 <0.002 < <5E 05 < < < <0.001 n/a <0.005 <0.005 < /6/2007 n/a n/a n/a n/a 14.2 < < <5E 05 < < < < < n/a < < < /19/2007 n/a n/a n/a 11 < n/a 21.8 < < < < < < < < n/a < < < /1/2008 n/a n/a n/a 10.9 < n/a 10.9 < < < < < < n/a < < /18/2008 n/a n/a n/a < n/a 12.2 < < < < < n/a <0.001 < /17/2009 n/a n/a n/a n/a 20.6 < < < n/a < /7/2009 n/a n/a n/a n/a 18.3 < < < < n/a <0.001 < /16/2010 n/a n/a n/a n/a 15.1 < < < < <0.001 < < n/a <0.002 < MW 9R 9/28/2010 n/a n/a n/a n/a 36.7 < < < <0.001 < < n/a <0.002 < /30/2010 n/a n/a n/a n/a 13 < < < < n/a < < /9/2011 n/a n/a n/a n/a 45 <0.001 < <0.001 < <0.01 <0.01 <0.002 <0.001 n/a <0.02 <0.001 <0.01 6/3/2011 n/a n/a n/a n/a 74 <0.001 < <0.001 < <0.01 < <0.001 n/a <0.02 <0.001 <0.01 9/13/2011 n/a n/a n/a n/a 28 < <0.001 < <0.01 <0.01 <0.002 <0.001 n/a <0.02 <0.001 <0.01 3/13/2012 n/a n/a n/a n/a 14 < <0.001 < < n/a <0.001 <0.01 9/26/2012 n/a n/a n/a n/a 16 < <0.001 < < n/a <0.02 <0.001 <0.01 3/6/2013 n/a n/a n/a 0.24(BJO) 8.1(BR) 0.65(B) n/a 0.65(BJ) (J) (J) < (R) (J) 0.017(R) 0.01(R) < (R) (J) <0.01 9/12/2013 n/a n/a n/a n/a (J) (J) (J) (BR) < (J) < /5/2014 n/a n/a n/a n/a 20 < (J) 00019(J) (J) 00033(J) n/a < /9/2014 n/a n/a n/a n/a 52 < (J) 0.17 <0.001 < (J) (J) (J) n/a <0.001 < /22/2015 n/a n/a n/a n/a 13 <0.002 <0.002(J) 0.17 <0.002 < <0.002(J) <0.002(J) n/a 0.02 <0.002 < /12/2015 n/a n/a n/a n/a (J) (J) <0.002 < (J) (J) (J) n/a <0.002 <0.002 MW 14 3/16/ < <0.006 <0.005 <1 <0.004 <0.005 <0.005 <0.1 <0.03 <0.015 n/a <0.1 <0.005 <0.05 5/23/ <0.006 <0.005 <1 <0.004 <0.005 <0.05 <0.03 < n/a <0.05 <0.005 <0.05 6/29/ <0.006 <0.005 <1 <0.004 <0.005 <0.05 <0.03 <0.03 <0.015 n/a <0.1 <0.005 <0.05 7/25/ < <0.006 <0.005 <1 <0.004 < <0.03 <0.03 <0.015 n/a 0.52 <0.005 <0.05 2/8/ <0.014 <0.008 <1 <0.004 <0.005 <0.05 <0.03 < n/a <0.1 <0.008 <0.05 8/6/ < <0.006 <0.01 <1 <0.004 <0.005 <0.05 <0.02 < n/a <0.05 <0.01 <0.05 2/26/1997 < <0.006 <0.01 <1 <0.004 <0.005 <0.05 <0.02 < n/a <0.05 <0.01 <0.05 9/10/ < <0.006 <0.01 <1 <0.004 <0.005 <0.05 <0.02 <0.03 <0.015 n/a <0.05 <0.02 <0.05 4/9/ < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/23/ <0.006 <0.005 <0.1 <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 3/16/1999 < < <0.006 <0.005 <0.1 <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/29/1999 < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a < <0.01 3/14/2000 < < < < < < < < < n/a < < < /20/2000 < < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 3/21/2001 < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/26/2001 < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.005 <0.01 3/27/2002 < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/25/2002 < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 4/1/2003 < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/17/2003 < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 3/24/2004 / < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 MW 14R upgradient 9/14/2004 n/a n/a n/a n/a 136 <0.006 < <0.004 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 3/9/2005 n/a n/a n/a n/a 162 <0.006 < <0.002 <0.003 <0.005 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 R flag indicates value is rejected; not used in statistical analyses. 3 of 24 Beryllium (m mg Cadmium (m mg mg Chromium ( L) Cobalt (mg/ Copper (mg/ Lead (mg g/l) Mercury (mg L) Nickel (mg/l Selenium (m mg ) Silver (mg/l

15 s N (mg Ammonia as g Calcium (mg COD (mg g Chloride (mg Iron (mg (mg Manganese Sodium (mg Sulfate (mg/ Antimony (m mg Arsenic (mg/ Barium (mg/ MW 14R (cont.) 9/28/2005 n/a n/a n/a n/a 154 < < < <0.02 <0.002 <0.001 n/a <0.01 <0.003 < /15/2006 n/a n/a n/a n/a 167 < < < <0.002 <0.001 n/a <0.003 < /20/2006 n/a n/a n/a n/a 121 <0.002 < <5E 05 < < <0.1 <0.002 <0.001 n/a <0.005 <0.005 < /6/2007 n/a n/a n/a n/a 94.7 <0.002 < <5E 05 < <0.02 <0.002 <0.001 n/a <0.003 < /19/2007 n/a n/a n/a n/a 104 < < < < < < < n/a < < /1/2008 n/a n/a n/a 26.9 < n/a 105 < < < < < < n/a 0.01 < < /18/2008 n/a n/a n/a n/a 86 < < < < n/a <0.001 < /17/2009 n/a n/a n/a n/a 91.8 < < < < n/a < /7/2009 n/a n/a n/a n/a 106 < < < E 05 n/a <0.001 < /16/2010 n/a n/a n/a n/a 84.4 < < < < < < n/a <0.002 < /28/2010 n/a n/a n/a n/a 85.4 < < < < <0.001 < < n/a <0.002 < /9/2011 n/a n/a n/a n/a 94 < <0.001 < <0.01 <0.01 <0.002 <0.001 n/a <0.02 <0.001 <0.01 9/13/2011 n/a n/a n/a n/a 85 < <0.001 < <0.01 <0.01 <0.002 <0.001 n/a <0.02 <0.001 <0.01 3/13/2012 n/a n/a n/a n/a 84 < <0.001 < <0.01 < n/a < <0.01 9/26/2012 n/a n/a n/a n/a 74 < <0.001 < <0.01 <0.01 <0.002 <0.001 n/a <0.02 <0.001 <0.01 3/5/2013 n/a n/a n/a 47(B) 5.3(B) 0.56(B) n/a 72(B) < (J) < < (J) (J) < (J) (J) <0.01 9/10/2013 n/a n/a n/a n/a (J) < (J) (J) (JB) (J) < (J) < /4/2014 n/a n/a n/a n/a 77 < < (J) (J) (J) (J) n/a < /6/2014 n/a n/a n/a n/a 81 < <0.001 < n/a < /14/2015 n/a n/a n/a 50(B) n/a 76 <0.002(JB) <0.002(J) 0.31 <0.002 <0.001 <0.002(J) <0.002(J) <0.005(B) <0.002 n/a <0.002(J) <0.002 < /14/2015 n/a n/a n/a n/a (J) <0.002 < (J) (J) (J) (J) n/a (J) <0.002 < /12/2016 n/a n/a n/a n/a (J) (J) < < (J) 00124(J) (J) 00122(J) (J) (J) n/a < < /2/2016 n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a MW 16 3/16/ <0.006 <0.005 <1 <0.004 <0.005 <0.005 <0.1 <0.03 <0.015 n/a <0.1 <0.005 <0.05 5/23/ n/a /29/ (R) 1.17(R) <0.006 <0.005 <1 <0.004 <0.005 <0.05 <0.03 <0.03 <0.015 n/a <0.1 <0.005 <0.05 7/25/ < (R) 1.18(R) <0.006 <0.005 <1 <0.004 <0.005 <0.05 <0.03 <0.03 <0.015 n/a <0.1 <0.005 <0.05 2/8/ < <0.014 <0.008 <1 <0.004 <0.005 <0.05 <0.03 <0.03 <0.015 n/a <0.1 <0.008 <0.05 8/6/ < <0.006 <0.01 <1 <0.004 <0.005 <0.05 <0.02 < n/a <0.05 <0.01 <0.05 2/26/1997 < < <0.006 <0.01 <1 <0.004 <0.005 <0.05 <0.02 < n/a <0.05 <0.01 <0.05 9/10/ < <0.006 <0.01 <1 <0.004 <0.005 <0.05 <0.02 <0.03 <0.015 n/a <0.05 <0.02 <0.05 4/9/ < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/23/ <0.006 <0.005 <0.1 <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 3/16/1999 < < <0.006 <0.005 <0.1 <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/29/ < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 3/14/2000 < < <0.006 < <0.002 <0.003 <0.01 <0.01 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/20/2000 < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 3/21/2001 < < < < < < < < < < n/a < < < /26/ < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.005 <0.01 3/27/2002 < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/25/2002 < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 4/1/2003 < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/17/2003 < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 3/24/2004 < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/14/2004 n/a n/a n/a n/a 42.3 <0.006 < <0.004 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 3/9/2005 / n/a n/a n/a n/a 44.4 <0.006 < <0.004 <0.003 <0.005 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/28/2005 n/a n/a n/a n/a 31.8 <0.002 < < < <0.02 <0.002 <0.001 n/a <0.01 <0.003 < /15/2006 n/a n/a n/a n/a 36.8 <0.002 < < < <0.02 <0.002 <0.001 n/a <0.003 < /20/2006 n/a n/a n/a n/a 40.6 <0.002 < <5E 05 < < <0.1 <0.002 <0.001 n/a <0.005 <0.005 < R flag indicates value is rejected; not used in statistical analyses. 4 of 24 Beryllium (m mg Cadmium (m mg mg Chromium ( L) Cobalt (mg/ Copper (mg/ Lead (mg g/l) Mercury (mg L) Nickel (mg/l Selenium (m mg ) Silver (mg/l

16 s N (mg Ammonia as g Calcium (mg COD (mg g Chloride (mg Iron (mg (mg Manganese Sodium (mg Sulfate (mg/ Antimony (m mg Arsenic (mg/ Barium (mg/ MW 16 (cont.) 3/6/2007 n/a n/a n/a n/a 26.1 <0.002 < <5E 05 < < <0.02 <0.002 <0.001 n/a <0.002 <0.003 < /19/2007 n/a n/a n/a 15 < n/a 32.6 < < < < < < < < n/a < < /1/2008 n/a n/a n/a 12.9 < n/a 35.2 < < < < < < n/a < < /18/2008 n/a n/a n/a < n/a 34.2 < < < < < n/a <0.001 < /17/2009 n/a n/a n/a (R) n/a 28.1 < < < n/a < /7/2009 n/a n/a n/a n/a 47.6 < < < < E 05 n/a <0.001 < /16/2010 n/a n/a n/a n/a 38.8 < < < < < < n/a <0.002 < MW 16R 9/28/2010 n/a n/a n/a n/a 32.1 < < < < <0.001 < < n/a <0.002 < /30/2010 n/a n/a n/a n/a 22.4 < < < < <0.001 < n/a <0.001 < < /9/2011 n/a n/a n/a n/a 24 <0.001 < < < <0.01 <0.01 <0.002 <0.001 n/a <0.02 <0.001 <0.01 6/3/2011 n/a n/a n/a n/a 25 <0.001 < < < <0.01 <0.01 <0.002 <0.001 n/a <0.02 <0.001 <0.01 9/13/2011 n/a n/a n/a n/a 25 < < < <0.01 <0.01 <0.002 <0.001 n/a <0.02 <0.001 <0.01 3/13/2012 n/a n/a n/a n/a 26 < < < < n/a <0.001 <0.01 9/26/2012 n/a n/a n/a (R) 0.52(R) n/a 20 < (R) 0.12(R) <0.001 < (R) < (R) (R) n/a < (R) <0.01 3/5/2013 n/a n/a n/a 8(B) 11(BR) 0.83(BR) n/a 22(B) (JR) (R) 0.24(R) (R) < (R) (JR) 0.039(R) 0.024(R) < (R) (JR) (JR) 9/11/2013 n/a n/a n/a n/a (J) (J) < (BO) < (J) < /4/2014 n/a n/a n/a n/a 20 < < (J) (J) n/a < /23/2014 n/a n/a n/a n/a (J) (J) 0.11 <0.002 < < (J) (J) n/a < /21/2015 n/a n/a n/a n/a 21.3 <0.002 <0.002(J) 0.12 <0.002 <0.001 <0.002(J) <0.002 <0.005 <0.002 n/a <0.002(J) <0.002 < /16/2015 n/a n/a n/a n/a (J) (J) 0.12 <0.002 < < (J) (J) n/a <0.002 < /14/2016 n/a n/a n/a n/a (J) (J) (J) 00163(J) < < < (J) (J) < n/a < < MW 17 3/16/1995 < <0.006 <0.005 <1 <0.004 <0.005 <0.005 <0.1 <0.03 <0.015 n/a <0.1 <0.005 <0.05 5/23/ <0.006 <0.005 <1 <0.004 <0.005 <0.05 <0.03 < n/a <0.05 <0.005 <0.05 6/29/ <0.006 <0.005 <1 <0.004 <0.005 <0.05 <0.03 <0.03 <0.015 n/a <0.1 <0.005 <0.05 7/25/ <0.006 <0.005 <1 <0.004 <0.005 <0.05 <0.03 <0.03 <0.015 n/a <0.1 <0.005 <0.05 2/8/ < <0.014 <0.008 <1 <0.004 <0.005 <0.05 <0.03 < n/a <0.1 <0.008 <0.05 8/6/ < <0.006 <0.01 <1 <0.004 <0.005 <0.05 <0.02 < n/a <0.05 <0.01 <0.05 2/26/1997 < <0.006 <0.01 <1 <0.004 <0.005 <0.05 <0.02 < n/a <0.05 <0.01 <0.05 9/10/ < <0.006 <0.01 <1 <0.004 <0.005 <0.05 <0.02 <0.03 <0.015 n/a <0.05 <0.02 <0.05 4/9/ < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/23/ <0.006 <0.005 <0.1 <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 3/16/1999 < < <0.006 <0.005 <0.1 <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/29/ < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 3/14/2000 < < < <0.006 <0.005 <0.1 <0.002 <0.003 <0.01 <0.01 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/20/2000 < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 3/21/2001 < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/26/2001 < < < < < < < < < n/a < < < /27/ < <0.006 < <0.002 < <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/25/2002 < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 4/1/2003 < < <0.006 < <0.002 <0.003 <0.01 < <0.005 n/a <0.01 <0.01 <0.01 9/17/2003 < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a < <0.01 MW 17R upgradient 9/14/2004 n/a n/a n/a n/a 58.5 <0.006 < <0.004 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 3/9/2005 n/a n/a n/a <0.05 n/a 58.4 <0.006 <0.005 <0.01 <0.002 <0.003 <0.005 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/28/2005 / n/a n/a n/a <0.03 n/a 61.6 <0.002 < < < <0.02 <0.001 <0.001 n/a <0.01 <0.003 < /15/2006 n/a n/a n/a <0.03 n/a 57.8 <0.002 < < < <0.02 <0.001 <0.001 n/a <0.003 < /20/2006 n/a n/a n/a <0.03 n/a 58.1 <0.002 < <5E 05 < < <0.1 <0.002 <0.001 n/a <0.005 <0.005 < /6/2007 n/a n/a n/a <0.03 n/a 47.7 <0.002 < <5E 05 < <0.02 <0.002 <0.001 n/a <0.002 <0.003 < R flag indicates value is rejected; not used in statistical analyses. 5 of 24 Beryllium (m mg Cadmium (m mg mg Chromium ( L) Cobalt (mg/ Copper (mg/ Lead (mg g/l) Mercury (mg L) Nickel (mg/l Selenium (m mg ) Silver (mg/l

17 s N (mg Ammonia as g Calcium (mg COD (mg g Chloride (mg Iron (mg (mg Manganese Sodium (mg Sulfate (mg/ Antimony (m mg Arsenic (mg/ Barium (mg/ MW 17R (cont.) 9/19/2007 n/a n/a n/a 14 <0.25 <0.015 n/a 47.4 < < < < < < < n/a < < /1/2008 n/a n/a n/a 12.9 <10 <0.015 n/a 45.2 < < (R) < < (R) < (R) < n/a (R) < < /18/2008 n/a n/a n/a < (R) (R) n/a 38.3 < (R) (R) < < (R) < (R) (R) n/a (R) <0.001 < /17/2009 n/a n/a n/a (R) (R) n/a 36.9 < (R) (R) < < (R) < (R) (R) n/a (R) <0.001 < /7/2009 n/a n/a n/a n/a < < < E 05 n/a < < /16/2010 n/a n/a n/a n/a 33.7 < < < <0.001 < < n/a <0.002 < /28/2010 n/a n/a n/a n/a 31.9 < < < < <0.001 < < n/a <0.002 < /9/2011 n/a n/a n/a (O) n/a 34 <0.001 < <0.001 < <0.01 <0.01 <0.002 <0.001 n/a <0.02 <0.001 <0.01 9/13/2011 n/a n/a n/a n/a 36 <0.001 < <0.001 < <0.01 <0.01 <0.002 <0.001 n/a <0.02 <0.001 <0.01 3/13/2012 n/a n/a n/a (R) 0.052(R) n/a 36 < (R) 0.11(R) <0.001 < (R) < (R) (R) n/a 0.02(R) <0.001 <0.01 9/26/2012 n/a n/a n/a (R) 0.06(R) n/a 37 <0.001 < (R) (R) < <0.01 <0.01 < (R) n/a <0.02 <0.001 <0.01 3/5/2013 n/a n/a n/a 8.1(B) 1.3(B) 0.055(B) n/a 30(B) < (J) (J) < <0.01 <0.002 <0.001 < (J) < (J) 9/11/2013 n/a n/a n/a (R) 0.15(R) n/a (JR) (R) 0.1(R) < (JR) 0.44(R) (R) 0.016(BR) (JR) < (R) <0.001 < /5/2014 n/a n/a n/a n/a 33 < < (J) (J) (J) < (J) n/a (J) < /9/2014 n/a n/a n/a n/a (J) (J) 0.11 <0.001 < (J) <0.002 <0.001 n/a <0.001 < /21/2015 n/a n/a n/a n/a 33.8 <0.002(J) <0.002(J) 0.1 <0.002 < <0.002 <0.005 <0.002 n/a <0.002 < /14/2015 n/a n/a n/a n/a 34.8 < (J) <0.002 < (J) (J) <0.002 n/a <0.002 < /12/2016 n/a n/a n/a n/a (J) (J) <0.002 < (J) (J) <0.002 n/a < (J) 8/2/2016 n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a (J) n/a n/a n/a n/a n/a n/a n/a MW 18 3/16/ < <0.006 <0.005 <1 <0.004 <0.005 <0.005 <0.1 <0.03 <0.015 n/a <0.1 <0.005 <0.05 5/23/ < < <1 < < < < < < n/a < < < /29/ <0.005 <1 <0.004 <0.005 <0.05 <0.03 <0.03 <0.015 n/a <0.1 <0.005 <0.05 7/25/ < <0.006 <0.005 <1 <0.004 <0.005 <0.05 <0.03 <0.03 <0.015 n/a <0.1 <0.005 <0.05 2/8/ < <0.014 <0.008 <1 <0.004 <0.005 <0.05 <0.03 < n/a <0.1 <0.008 <0.05 8/6/1996 < < <0.006 <0.01 <1 <0.004 <0.005 <0.05 <0.02 < n/a <0.05 <0.01 <0.05 2/26/1997 < < <0.006 <0.01 <1 <0.004 <0.005 < < n/a <0.05 <0.01 <0.05 9/10/ < <0.006 <0.01 <1 <0.004 <0.005 <0.05 <0.02 <0.03 <0.015 n/a <0.05 <0.02 <0.05 4/9/ < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/23/ <0.006 <0.005 <0.1 <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 3/16/1999 < < <0.006 <0.005 <0.1 <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 9/29/ < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a < <0.01 3/14/2000 < < <0.006 < <0.002 <0.003 <0.01 <0.01 <0.005 <0.005 n/a < <0.01 9/20/2000 < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 3/21/2001 < < < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 9/26/2001 < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.005 <0.01 3/27/2002 < < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a < <0.01 9/25/ < <0.006 < <0.002 <0.003 <0.01 <0.02 <0.005 <0.005 n/a <0.01 <0.01 <0.01 4/1/2003 < < < < < < < < < < n/a < < < /17/ (R) < < < <0.005 n/a <0.01 <0.01 <0.01 MW 19 9/28/2010 n/a n/a n/a n/a 27.4 < < < < < < n/a <0.002 < /30/2010 n/a n/a n/a n/a 29.4 < < < < <0.001 < n/a < < /9/2011 n/a n/a n/a n/a 37 <0.001 < <0.001 < <0.01 <0.01 <0.002 <0.001 n/a <0.02 <0.001 <0.01 6/3/2011 n/a n/a n/a n/a 38 <0.001 < <0.001 < <0.01 <0.01 <0.002 <0.001 n/a <0.02 <0.001 <0.01 9/13/2011 n/a n/a n/a n/a 38 < <0.001 < <0.01 <0.01 <0.002 <0.001 n/a <0.02 <0.001 <0.01 3/13/2012 / n/a n/a n/a n/a <0.001 < < n/a <0.02 <0.001 <0.01 9/26/2012 n/a n/a n/a (R) 0.51(R) n/a 42 < (R) 0.3(R) <0.001 < <0.01 < (R) (R) n/a < (R) <0.01 3/5/2013 n/a n/a n/a 16(B) 5.1(BR) 0.6(BR) n/a 43(B) < (JR) 0.3(R) <0.001 < (R) (JR) 0.014(R) (JR) < (R) <0.001 <0.01 9/11/2013 n/a n/a n/a n/a (J) <0.001 < (BO) < (J) <0.001 R flag indicates value is rejected; not used in statistical analyses. 6 of 24 Beryllium (m mg Cadmium (m mg mg Chromium ( L) Cobalt (mg/ Copper (mg/ Lead (mg g/l) Mercury (mg L) Nickel (mg/l Selenium (m mg ) Silver (mg/l