H HILMAR. June 7, 2077

Transcription

1 Upper H HILMAR INGIT S June 7, 2077 Mr. Doug Patteson Supervising WRC Engineer CaLifornia RegionaL Water Quality Control Board CentraL Vattey Region - Region S Fresno Office 1685 E Street Fresno, Catifornia RE: Hitmar Cheese Company, Inc. ( HCC ) Hilmar, Merced County, California Cleanup and Abatement Order ( Order ) R Proposed Modifications to Monitoring & Sampling (M&S) Program Dear Mr. Patteson: At the Aprit 4, 2017 meeting between Hitmar Cheese Company (HCC), you, RusselL Watts, Jan Atfson and Jacobson James & Associates (JJ&A), HCC and JJ&A provided an overview of the current status of activities required pursuant to the Order. Included in the overview was a discussion of current groundwater monitoring well trends in the three (3) identified water bearing zones - Aquifer Shallow Zone, Upper Aquifer Suppty Zone and Lower Aquifer Zone. Fotlowing the meeting, HCC requested that JJ&A review and evaluate the discussions from the meeting and develop proposed recommendations, with appropriate justification, for modification of the current MEtS Program. The proposed recommendations and detailed justifications for modification of the MEtS Program are presented in the attached letter from JJ&A to HCC. Briefty, these include the fotlowing: Upper Aquifer Shallow Zone: Removal of groundwater monitoring welts MW-03, MW-04, MW-il, MW-16 and MW-2i from the current MEtS Program; Upper Aquifer Suppty Zone: Removal of MW-18 from the current MEtS Program; Lower Aquifer: Removal of MW-23 from the current MEtS Program; and Sampling frequency: Revise the sampling frequency for MW-Ui, MW-05, MW-07, MW-i 3 and MW-15 from semi-annual sampling to annual sampling. It should be noted that no recommendations are being made at this time for modification of the MEtS Program for those groundwater monitoring currently being sampled on a quarterly basis pursuant to WDR Order No. R5-20i HCC is requesting that the RWQCB evaluate the HCC request to modify the current MEtS Program in accord with the attached JJEtA recommendations and approve the modifications as proposed. Headquarters & Innovation Center 8901 North LanderAvenue, P.O. Box 910, Hilmar, CA USA T: Fax: hilmarcheese.com Hilmar Manufacturing Site & Visitor Center: 9001 North Lander Avenue, P.O. Box 910, Hilmar, CA USA 1: Turlock Manufacturing Site: 3600 West Canal Drive, Turlock, CA 95380, Mail: P.O. Box 910, Hilmar, CA USA 1: Daihart Manufacturing Site: US Highway 385, P.O. Box 1300, Dalhart, TX USA 1:

2 Letter to: Mr. Doug Patteson June 7, 2017 Page 2 I certify under penatty of tow that I have personatty examined and am famitiar with the information submitted in these documents and att attachments and that, based on my inquiry of those individuats immediately responsibte for obtaining the information, I betieve that the information is true, accurate, and comptete. I am aware that there are significant penatties for submitting fatse information, inctuding the possibility of fine and imprisonment. Any questions on the above can be addressed to my attention at (209) Sincerely, Hi tmar Cheese Company, Inc. Burton N. Fteischer EnvironmentaL Director cc: Jan Atfson, Engineering Geologist, RWQCB Russett Watts, Senior WRC Engineer, RWQCB David Ahtem,

3 June 7, 2017 Mr. Burton N. Fleischer Environmental Director 9001 North Lander Avenue Subject: CAO No. R , Hilmar, Merced County Dear Mr. Fleischer: As requested by, (HCC), Jacobson James & Associates, Inc. (JJ&A) has reviewed the current groundwater Monitoring and Sampling Program (M&S Program) being conducted pursuant to the Central Valley Regional Water Quality Control Board (CVRWQCB) Cleanup and Abatement Order (CAO) No. R Based on the review, JJ&A is recommending proposed modifications to the M&S Program. The proposed modifications are designed to maximize the efficiency of the data collection efforts while continuing to comprehensively characterize groundwater quality to confirm the on going effectiveness of the remedial action alternative being implemented at the Site. The proposed modifications are based on the review of more than six years of groundwater data collected per the CAO and the CVRWQCB issued Waste Discharge Requirements (WDRs) Order No. R BACKGROUND The Site, as shown in Figure 1, is located slightly north of the town of Hilmar in Merced County, California. Agriculture is the predominant land use both regionally, and in the vicinity of the Site. Historical Site activities included the discharge of partially treated wastewater from HCC to areas formerly identified as Primary Lands. The last discharge of partially treated waste water to the former Primary Lands occurred in December Since December 2010, the former Primary Lands, now identified as Reuse Areas, receive fully treated reuse water from the HCC on site Water Reclamation (WR) facility. The reuse water complies with the requirements contained in the WDRs and is used for agriculture purposes. In addition, the Reuse Areas can receive Turlock Irrigation District (TID) water and/or dairy waste water. Figure 2 shows the locations of the current groundwater monitoring wells. The CAO required that HCC investigate the lateral and vertical extent of the groundwater to determine the potential impact from historic HCC operations, as well as requiring that HCC evaluate and select potential remedial options for groundwater determined to be impacted by historic HCC operations. The CAO activities resulted in the identification of three water bearing intervals beneath the Site that HCC Modification to MRP 2017_ _FINAL.docx

4 , Hilmar, Merced County June 7, 2017 Page 2 of 5 are currently being monitored pursuant to the CAO and WDRs. These three zones are classified as the Upper Aquifer Shallow Zone (water table zone down to about 20 feet below ground surface [ft bgs]), the Upper Aquifer Supply Zone (stratigraphically below the shallow zone and above the Corcoran Clay (well depths range from 62 to 127 ft bgs); and the Lower Aquifer Zone (below the Corcoran Clay). The current groundwater monitoring well network pursuant to the CAO M&S Program consists of 20 monitoring wells sampled semi annually: MW 01, 03 through 09, 11 through 13, 15 through 19, 21 through 23, and 25. HCC also conducts quarterly groundwater monitoring of 20 monitoring wells (MW 04, 06, 08, 09, 11, 12, 16 through 19; MW 21 through 23; and, MW 30, 31, and 33 through 37) pursuant to the WDR. The current M&S Program is summarized on Table 1, including identification of the water bearing zone monitored by each well. MONITORING WELL DATA EVALUATION AND PROPOSED RECOMMENDATIONS Remedial Action Objectives (RAOs) were identified for the following constituents of concern (COCs) in the Upper Aquifer Shallow and Supply Zones: chloride, iron, manganese, nitrate as nitrogen, sodium, sulfate, and Total Dissolved Solids, as shown in Table 2. The RAOs are contained in the Upper Aquifer Remedial Action Plan 1, and progress towards attainment of the RAOs is discussed in detail in the groundwater monitoring reports submitted to the CVRWQCB. Charts were constructed to depict the COCs trends over time for the CAO M&S Program wells completed in Upper Aquifer Shallow, Upper Aquifer Supply, and Lower Aquifer Zones (Attachment 1). The historical results are tabulated in Attachment 2. Upper Aquifer Shallow Zone The current M&S Program for both the CAO and WDRs consists of 22 groundwater monitoring wells located in the Upper Aquifer Shallow Zone, as shown in Table 1. Fifteen of the 22 groundwater monitoring wells are sampled pursuant to the CAO: MW 01, 03 through 09, 11 through 13, 15 through 17, and 21, shown on Figure 2. The proposed modifications to the M&S Program are based on the attainment of RAOs for the COCs in the Upper Aquifer Shallow Zone as summarized on Table 3 and decreases of COCs observed in the subject wells that were identified as being impacted by former HCC operations, as shown in the charts (Attachment 1). The following wells are proposed to be removed from the M&S Program pursuant to the CAO: MW 03: The concentrations of COCs have decreased, resulting in attainment of the RAOs, with the exception of iron and manganese. 2 The iron concentrations are attributed to monitoring well biofouling as previously documented in routine reporting. The manganese concentrations are due to the reducing conditions in the saturated zone and are consistent with concentrations representative of ambient conditions surrounding the Site. Continued monitoring of water quality conditions at this location is not needed to assess Site clean up. 1 JJ&A, Upper Aquifer Remedial Action Plan,,. Revised February Iron and manganese were not significant components in HCC wastewater discharged to the Primary Lands.

5 , Hilmar, Merced County June 7, 2017 Page 3 of 5 MW 04: The concentrations of COCs have decreased resulting in attainment of the RAOs, with the exception of manganese. As with MW 03, the manganese concentrations are due to the reducing conditions in the saturated zone representative of ambient conditions. Continued monitoring of this location is not needed to assess Site clean up. MW 11: The COC in this up gradient well are variable with concentrations of the COCs below the RAOs. As shown on the chart, increases and/or decreases of specific COCs (e.g., chloride) indicate seasonal variations representative of ambient conditions un related to historical HCC operations. The water quality data collected from this well is no longer necessary to monitor the clean up of the Site. MW 16: The COC trends exhibit seasonal variability with higher concentrations typically observed during the October sampling events of each year (i.e., lowest water levels of the year). The COC concentrations have decreased resulting in attainment of the RAOs, with the exception of iron and manganese. The reasons for the iron and manganese concentrations are the same as those presented in the discussions for MW 03 and MW 04. Monitoring well MW 16 is not downgradient with respect to groundwater flow from the Site, and is not located within the plume of groundwater impacted by historical HCC discharges, and as such is no longer necessary to monitor the clean up of the Site. MW 21: The COC concentrations have decreased resulting in attainment of the RAOs, with the exception of nitrate. The nitrate concentrations are slightly above the RAO and are related to ambient conditions. This well is located east and upgradient of the Site and was installed to be representative of background conditions in an area not impacted by former HCC operations. Based on the progress being made with regard to attainment of ROAs, this background well is no longer needed. Upper Aquifer Supply Zone The current M&S Program for both the CAO and WDR M&S Programs include four groundwater monitoring wells located in the Upper Aquifer Supply Zone: MW 18, MW 19, MW 22 and MW 25. The Upper Aquifer Zone RAO summary is included in Table 4 with charts showing the COCs trends over time included as Attachment 1. The following well is proposed for removal from the M&S Program. MW 18: This well is located upgradient of the Site and the COC concentrations exhibit attainment of the RAOs. The concentration trends are stable and indicative of ambient conditions. Groundwater data collected from this location is no longer necessary for monitoring of groundwater conditions. Lower Aquifer Zone The current M&S Program requires the sampling of one Lower Aquifer monitoring well: MW 23. MW 23: A chart showing COCs trends over time, included in Attachment 1, indicates stable and consistent COC trends representative of ambient conditions. As detailed in the Lower Aquifer Remedial Investigation Summary Report (JJ&A, August 20, 2012), HCC is not the source of

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7 , Hilmar, Merced County June 7, 2017 Page 5 of 5 LIST OF TABLES Table 1 Current Monitoring and Sampling Program Table 2 Remedial Action Objectives Table 3 RAO Attainment for Upper Aquifer Shallow Zone Table 4 RAO Attainment for Upper Aquifer Supply Zone Table 5 Summary of Proposed Modifications to the Monitoring and Sampling Program LIST OF FIGURES Figure 1 Site Map Figure 2 Proposed Sampling Plan Changes LIST OF ATTACHMENTS Attachment 1 Historical Trend Charts Attachment 2 Historical Analytical Data Summary

8 TABLES

9 , Hilmar, Merced County June 7, 2017 LIST OF TABLES Table 1 Current Monitoring and Sampling Program Table 2 Remedial Action Objectives Table 3 RAO Attainment for Upper Aquifer Shallow Zone Table 4 RAO Attainment for Upper Aquifer Supply Zone Table 5 Summary of Proposed Modifications to the Monitoring and Sampling Program

10 Identification Semi Annual Quarterly Monitoring Monitoring Water Bearing Zone DTW GWE Required by Required by Alkalinity as CaCO 3 Bicarbonate as CaCO 3 Current Constituents for Analysis Carbonate as CaCO 3 As Ca Cl EC Fe Hardness K Mg Mn Na TABLE 1 CURRENT MONITORING AND SAMPLING PROGRAM Nitrate as N ph Sulfate TDS TKN TN TOC CAO a WDR b MW 01 UA Shallow Zone X X X X X X X X X X X X X X X X X X MW 03 UA Shallow Zone X X X X X X X X X X X X X X X X X X MW 04 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X X MW 05 UA Shallow Zone X X X X X X X X X X X X X X X X X X MW 06 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X X MW 07 UA Shallow Zone X X X X X X X X X X X X X X X X X X MW 08 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X X MW 09 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X X MW 11 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X X MW 12 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X X MW 13 UA Shallow Zone X X X X X X X X X X X X X X X X X X MW 15 UA Shallow Zone X X X X X X X X X X X X X X X X X X MW 16 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X X MW 17 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X X MW 18 UA Supply Zone X X X X X X X X X X X X X X X X X X X X X X X X MW 19 UA Supply Zone X X X X X X X X X X X X X X X X X X X X X X X X MW 21 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X X MW 22 UA Supply Zone X X X X X X X X X X X X X X X X X X X X X X X X MW 23 LA C Zone X X X X X X X X X X X X X X X X X X X X X X X X MW 25 UA Supply Zone X X X X X X X X X X X X X X X X X X MW 30 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X MW 31 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X MW 33 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X MW 34 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X MW 35 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X MW 36 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X MW 37 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X Notes: a Monitoring required by CAO No. R for, Inc., Himar Whey, Inc., and Kathy and Delton Nyman. In addition, monitoring required by Monitoring and Reporting Program No. R b Monitoring required by Order No. R Waste Discharge Requirements for, Inc. and Reuse Area Owners. In addition, monitoring required by Monitoring and Reporting Program No. R As = dissolved arsenic Ca = dissolved calcium CaCO 3 = calcium carbonate CAO = Cleanup and Abatement Order Cl = dissolved chloride DTW = depth to water EC = electrical conductivity Fe = dissolved iron GWE = groundwater elevation K = dissolved potassium LA = Lower Aquifer Mg = dissolved magnesium Mn = dissolved manganese N = nitrate Na = dissolved sodium TDS = total dissolved solids TKN = total kjeldahl nitrogen TN = total nitrogen (equals TKN + Nitrate as N) TOC = total organic carbon UA = Upper Aquifer WDR = Waste Discharge Requirement Page 1 of 1

11 TABLE 2 REMEDIAL ACTION OBJECTIVES Constituent Remedial Action Objective (RAO) a,b,c Upper Aquifer Shallow Zone Upper Aquifer Supply Zone Chloride Iron Manganese Nitrate as Nitrogen Sodium Sulfate Total Dissolved Solids (TDS) Notes: a All units in milligrams per liter. b RAOs are provided for Constituents of Concern (COCs) that have Maximum Contaminant Levels (MCLs), with the exception of: (1) electrical conductivity, as TDS is a representative indicator, and (2) sodium, which does not have a MCL but was requested as a key indicator constituent by the Central Valley Regional Water Quality Control Board for the Upper Aquifer groundwater modeling of remedial alternatives. The COCs without MCLs will be represented by the TDS RAO. c The RAOs reflect the lower of the MCL or agricultural use level, unless lower than the ambient screening threshold, in which case the ambient screening threshold was selected as the RAO, as described in the Upper Aquifer Remedial Action Plan (Jacobson James & Associates [JJ&A], 2013). Source: JJ&A, Upper Aquifer Remedial Action Plan,,. Revised February 28. Page 1 of 1

12 TABLE 3 RAO ATTAINMENT FOR UPPER AQUIFER SHALLOW ZONE, Constituents of Concern Well ID Cl Fe Mn Na NO 3 N SO 4 TDS MW 01 X X X X X X X MW 03 X X X X X X MW 04 X X X X X X MW 05 X X X X X X X X X MW 06 X X X X X X X X MW 07 X X X X X X X X MW 08 X X X X X X MW 09 X X X X X MW 11 X X MW 12 X X MW 13 X X X X X X X MW 15 X X X X X MW 16 X X X MW 17 X X MW 21 X X Notes: RAO Attained RAO Not Attained Cl = dissolved chloride Fe = dissolved iron Mn = dissolved manganese Na = dissolved sodium NO 3 N = nitrate as nitrogen RAO = Remedial Action Objective SO 4 = sulfate TDS = total dissolved solids Page 1 of 1

13 TABLE 4 RAO ATTAINMENT FOR UPPER AQUIFER SUPPLY ZONE, Well ID Constituents of Concern Cl Fe Mn Na NO 3 N SO 4 TDS MW 18 X MW 19 X MW 22 X X X MW 25 X X Notes: RAO Attained RAO Not Attained Cl = dissolved chloride Fe = dissolved iron Mn = dissolved manganese Na = dissolved sodium NO 3 N = nitrate as nitrogen RAO = Remedial Action Objective SO 4 = sulfate TDS = total dissolved solids Page 1 of 1

14 Identification Annual Quarterly Monitoring Monitoring Water Bearing Zone DTW GWE Required by Required by Alkalinity as CaCO 3 Bicarbonate as CaCO 3 Carbonate as CaCO 3 As Ca Cl EC Fe Hardness K Mg Mn Na TABLE 5 SUMMARY OF PROPOSED MODIFICATIONS TO THE MONITORING AND SAMPLING PROGRAM Nitrate as N ph Sulfate TDS TKN TN TOC CAO a WDR b MW 01 UA Shallow Zone X X X X X X X X X X X X X X X X X X MW 03 UA Shallow Zone MW 04 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X MW 05 UA Shallow Zone X X X X X X X X X X X X X X X X X X MW 06 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X X MW 07 UA Shallow Zone X X X X X X X X X X X X X X X X X X MW 08 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X X MW 09 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X X MW 11 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X MW 12 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X X MW 13 UA Shallow Zone X X X X X X X X X X X X X X X X X X MW 15 UA Shallow Zone X X X X X X X X X X X X X X X X X X MW 16 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X MW 17 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X X MW 18 UA Supply Zone X X X X X X X X X X X X X X X X X X X X X X X MW 19 UA Supply Zone X X X X X X X X X X X X X X X X X X X X X X X X MW 21 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X MW 22 UA Supply Zone X X X X X X X X X X X X X X X X X X X X X X X X MW 23 LA C Zone X X X X X X X X X X X X X X X X X X X X X X X MW 25 UA Supply Zone X X X X X X X X X X X X X X X X X X X X X X X X MW 30 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X MW 31 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X MW 33 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X MW 34 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X MW 35 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X MW 36 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X MW 37 UA Shallow Zone X X X X X X X X X X X X X X X X X X X X X X X Notes: a Monitoring required by CAO No. R for, Inc., Himar Whey, Inc., and Kathy and Delton Nyman. In addition, monitoring required by Monitoring and Reporting Program No. R b Monitoring required by Order No. R Waste Discharge Requirements for, Inc. and Reuse Area Owners. In addition, monitoring required by Monitoring and Reporting Program No. R As = dissolved arsenic Ca = dissolved calcium CaCO 3 = calcium carbonate CAO = Cleanup and Abatement Order Cl = dissolved chloride DTW = depth to water EC = electrical conductivity Fe = dissolved iron GWE = groundwater elevation K = dissolved potassium LA = Lower Aquifer Mg = dissolved magnesium Mn = dissolved manganese N = nitrate Na = dissolved sodium TDS = total dissolved solids TKN = total kjeldahl nitrogen TN = total nitrogen (equals TKN + Nitrate as N) TOC = total organic carbon UA = Upper Aquifer WDR = Waste Discharge Requirement Wells proposed to be removed/modified for the CAO program. Current Constituents for Analysis Page 1 of 1

15 FIGURES

16 , Hilmar, Merced County June 7, 2017 LIST OF FIGURES Figure 1 Site Map Figure 2 Proposed Sampling Plan Changes

17 Path: J:\GIS\Hilmar\Reports\Adhoc\Figure 1 Hilmar Site Map_2015.mxd SOURCE:NATIONAL GEOGRAPHIC CALIFORNIA TOPO VERSION 4.2 SITE LOCATION Miles LOCATION HILMAR CHEESE COMPANY HILMAR, CALIFORNIA DATE DRAWN BY APPR. BY 9/21/13 DPG TJ OpenStreetMap (and) contributors, CC-BY-SA FIGURE 1 SITE LOCATION MAP

18 JOHNSON AVENUE S-34 S-33 S-31 S-23 S-24 LANDER AVENUE S-22 S-09 S-21 S-30 S-29 MW-16 & < S-13 MW-15 & < OSLO ROAD MW-13 & < S-67 & < MW-21 S-28 MW-34 & < S-48 S-45 S-11 TEGNER AVENUE MW-35 & < S-50 S-52 S-51 MW-37 & < S-43 S-44 LATERAL NO. 6 S-08 S-07 AUGUST AVENUE COLUMBUS AVENUE MW-12 & < MW-19 " m S-25 S-65 MW-06 MW-22 & < MW-07 "m & < MW-01 & < MW-09 S-63 & < MW-11 & < MW-08 & < OSLO STREET MW-23 " m S-64 MW-03 & < & < MW-05 " m MW-18 LATERAL No. 7 & < MW-04 S-46 S-53 MW-36 & < S-54 S-58 S-06 S-26 S-40 " m MW-25 Path: J:\GIS\Hilmar\Reports\2017\SamplingMod\Figure GW Sampling Plan Mod.mxd S-57 LEGEND &< " m S-60 S-63 S-47 S-55 UPPER AQUIFER SHALLOW ZONE MONITORING WELL S-61 UPPER AQUIFER SUPPLY ZONE MONITORING WELL LOWER AQUIFER MONITORING S-62 WELL HCC FACILITY CURRENT REUSE LAND AREA; FORMER PRIMARY LAND (NOTE: S-67 HAS NOT BEEN USED TO DATE) EXTENT OF HCC FACILITY AND HISTORICAL PRIMARY LANDS CURRENT REUSE AREA TURLOCK IRRIGATION DISTRICT LATERAL CANAL S-56 AMERICAN AVENUE WELL RECOMMENDED FOR REMOVAL FROM MONITORING AND SAMPLING PROGRAM NOTE: MW-30, MW-31, AND MW-33 ARE NOT DEPICTED DUE TO SCALE OF FIGURE. 0 1,000 SCALE IN FEET MW-17 & < S-41 PROJECT No. HCC.2017 HILMAR CHEESE COMPANY HILMAR, CALIFORNIA DATE 06/06/17 DRAWN BY DPG APPR. BY TJ FIGURE 2 PROPOSED SAMPLING PLAN CHANGES

19 ATTACHMENT 1 HISTORICAL TREND CHARTS

20 ATTACHMENT 1 HISTORICAL TREND CHARTS: MW 01 UPPER AQUIFER SHALLOW ZONE Total Dissolved Solids (milligram per liter) Chloride, Manganese,, Sodium, Sulfate (milligram per liter) Total Dissolved Solids Chloride Sulfate Note: Laboratory reported non detect results plotted as half of the reporting limit and shown with an open symbol.

21 ATTACHMENT 1 HISTORICAL TREND CHARTS: MW 03 UPPER AQUIFER SHALLOW ZONE Total Dissolved Solids (milligram per liter) Chloride, Manganese,, Sodium, Sulfate (milligram per liter) Total Dissolved Solids Chloride Sulfate Note: Laboratory reported non detect results plotted as half of the reporting limit and shown with an open symbol.

22 ATTACHMENT 1 HISTORICAL TREND CHARTS: MW 04 UPPER AQUIFER SHALLOW ZONE Total Dissolved Solids (milligram per liter) Chloride, Manganese,, Sodium, Sulfate (milligram per liter) Total Dissolved Solids Chloride Sulfate Note: Laboratory reported non detect results plotted as half of the reporting limit and shown with an open symbol.

23 ATTACHMENT 1 HISTORICAL TREND CHARTS: MW 05 UPPER AQUIFER SHALLOW ZONE Total Dissolved Solids (milligram per liter) Chloride, Manganese,, Sodium, Sulfate (milligram per liter) Total Dissolved Solids Chloride Sulfate Note: Laboratory reported non detect results plotted as half of the reporting limit and shown with an open symbol.

24 ATTACHMENT 1 HISTORICAL TREND CHARTS: MW 06 UPPER AQUIFER SHALLOW ZONE Total Dissolved Solids (milligram per liter) Chloride, Manganese,, Sodium, Sulfate (milligram per liter) Total Dissolved Solids Chloride Sulfate Note: Laboratory reported non detect results plotted as half of the reporting limit and shown with an open symbol.

25 ATTACHMENT 1 HISTORICAL TREND CHARTS: MW 07 UPPER AQUIFER SHALLOW ZONE Total Dissolved Solids (milligram per liter) Chloride, Manganese,, Sodium, Sulfate (milligram per liter) Total Dissolved Solids Chloride Sulfate Note: Laboratory reported non detect results plotted as half of the reporting limit and shown with an open symbol.

26 ATTACHMENT 1 HISTORICAL TREND CHARTS: MW 08 UPPER AQUIFER SHALLOW ZONE Total Dissolved Solids (milligram per liter) Chloride, Manganese,, Sodium, Sulfate (milligram per liter) Total Dissolved Solids Chloride Sulfate

27 ATTACHMENT 1 HISTORICAL TREND CHARTS: MW 09 UPPER AQUIFER SHALLOW ZONE Total Dissolved Solids (milligram per liter) Chloride, Manganese,, Sodium, Sulfate (milligram per liter) Total Dissolved Solids Chloride Sulfate Note: Laboratory reported non detect results plotted as half of the reporting limit and shown with an open symbol.

28 ATTACHMENT 1 HISTORICAL TREND CHARTS: MW 11 UPPER AQUIFER SHALLOW ZONE Total Dissolved Solids (milligram per liter) Chloride, Manganese,, Sodium, Sulfate (milligram per liter) Total Dissolved Solids Chloride Sulfate

29 ATTACHMENT 1 HISTORICAL TREND CHARTS: MW 12 UPPER AQUIFER SHALLOW ZONE Total Dissolved Solids (milligram per liter) Chloride, Manganese,, Sodium, Sulfate (milligram per liter) Total Dissolved Solids Chloride Sulfate Note: Laboratory reported non detect results plotted as half of the reporting limit and shown with an open symbol.

30 ATTACHMENT 1 HISTORICAL TREND CHARTS: MW 13 UPPER AQUIFER SHALLOW ZONE Total Dissolved Solids (milligram per liter) Chloride, Manganese,, Sodium, Sulfate (milligram per liter) Total Dissolved Solids Chloride Sulfate Note: Laboratory reported non detect results plotted as half of the reporting limit and shown with an open symbol.

31 ATTACHMENT 1 HISTORICAL TREND CHARTS: MW 15 UPPER AQUIFER SHALLOW ZONE Total Dissolved Solids (milligram per liter) Chloride, Manganese,, Sodium, Sulfate (milligram per liter) Total Dissolved Solids Chloride Sulfate Note: Laboratory reported non detect results plotted as half of the reporting limit and shown with an open symbol.

32 ATTACHMENT 1 HISTORICAL TREND CHARTS: MW 16 UPPER AQUIFER SHALLOW ZONE Total Dissolved Solids (milligram per liter) Chloride, Manganese,, Sodium, Sulfate (milligram per liter) Total Dissolved Solids Chloride Sulfate

33 ATTACHMENT 1 HISTORICAL TREND CHARTS: MW 17 UPPER AQUIFER SHALLOW ZONE Total Dissolved Solids (milligram per liter) Chloride, Manganese,, Sodium, Sulfate (milligram per liter) Total Dissolved Solids Chloride Sulfate

34 ATTACHMENT 1 HISTORICAL TREND CHARTS: MW 18 UPPER AQUIFER SUPPLY ZONE Total Dissolved Solids (milligram per liter) Chloride, Manganese,, Sodium, Sulfate (milligram per liter) Total Dissolved Solids Chloride Sulfate Note: Laboratory reported non detect results plotted as half of the reporting limit and shown with an open symbol.

35 ATTACHMENT 1 HISTORICAL TREND CHARTS: MW 19 UPPER AQUIFER SUPPLY ZONE Total Dissolved Solids (milligram per liter) Chloride, Manganese,, Sodium, Sulfate (milligram per liter) Total Dissolved Solids Chloride Sulfate

36 ATTACHMENT 1 HISTORICAL TREND CHARTS: MW 21 UPPER AQUIFER SHALLOW ZONE Total Dissolved Solids (milligram per liter) Chloride, Manganese,, Sodium, Sulfate (milligram per liter) Total Dissolved Solids Chloride Sulfate Note: Laboratory reported non detect results plotted as half of the reporting limit and shown with an open symbol. Well MW 21 has frequently been dry during sampling events, therefore, there is no analytical data to report from those events.

37 ATTACHMENT 1 HISTORICAL TREND CHARTS: MW 22 UPPER AQUIFER SUPPLY ZONE Total Dissolved Solids (milligram per liter) Chloride, Manganese,, Sodium, Sulfate (milligram per liter) Total Dissolved Solids Chloride Sulfate Note: Laboratory reported non detect results plotted as half of the reporting limit and shown with an open symbol.

38 ATTACHMENT 1 HISTORICAL TREND CHARTS: MW 23 LOWER AQUIFER C ZONE Total Dissolved Solids (milligram per liter) Chloride, Manganese,, Sodium, Sulfate (milligram per liter) Total Dissolved Solids Chloride Sulfate Note: Laboratory reported non detect results plotted as half of the reporting limit and shown with an open symbol.

39 ATTACHMENT 1 HISTORICAL TREND CHARTS: MW 25 UPPER AQUIFER SUPPLY ZONE Total Dissolved Solids (milligram per liter) Chloride, Manganese,, Sodium, Sulfate (milligram per liter) Total Dissolved Solids Chloride Sulfate Note: Laboratory reported non detect results plotted as half of the reporting limit and shown with an open symbol.

40

41 as CaCO 3 as CaCO 3 as CaCO 3 CaCO 3 Bromide Chloride Dissolved Iron MW 01 7/27/ MW 01 10/16/ MW 01 1/15/ MW 01 4/10/ MW 01 10/29/ MW 01 1/8/ MW 01 4/18/ MW 01 7/26/ MW 01 10/23/ MW 01 1/24/ MW 01 4/2/ < MW 01 6/19/ < MW 01 7/11/ < MW 01 8/15/ < MW 01 11/14/ < MW 01 2/14/ < MW 01 5/21/ < MW 01 8/20/ < MW 01 11/19/ < MW 01 2/18/ < MW 01 5/20/ < MW 01 8/25/ < MW 01 11/20/ < MW 01 2/26/ < MW 01 5/19/ < MW 01 8/20/ < MW 01 11/24/ < MW 01 2/15/ < MW 01 5/24/ < MW 01 8/20/ < MW 01 2/11/ MW 01 5/2/ <1 < MW 01 11/21/ <1 < < MW 01 12/14/ <1 < < MW 01 1/7/ <1 < < Nitrate (as NO 3 ) Kjeldahl Sulfate Page 1 of 88

42 as CaCO 3 as CaCO 3 as CaCO 3 CaCO 3 Bromide Chloride Dissolved Iron MW 01 2/2/ <1 < < <0.5 MW 01 3/27/ <1 < < MW 01 4/18/ <1 < < <0.5 MW 01 5/21/ <1 < < <0.5 MW 01 6/19/ <1 < < <0.5 MW 01 7/17/ <1 < < <0.5 MW 01 8/2/ <1 < < <0.5 MW 01 9/5/ <1 < < <0.5 MW 01 10/2/ <1 < < MW 01 11/6/ <1 < < <0.5 MW 01 12/5/ <1 < < MW 01 1/4/ <1 < < <0.5 MW 01 2/5/ <1 < < <0.5 MW 01 3/4/ <1 < < <0.5 MW 01 4/2/ <1 < < <0.5 MW 01 5/7/ <1 < < <0.5 MW 01 6/4/ <1 < < <0.5 MW 01 7/2/ <1 < < <0.5 MW 01 8/8/ <1 < < MW 01 9/5/ <1 < < MW 01 10/8/ <1 < < MW 01 11/5/ <1 < < MW 01 12/6/ <1 < < <0.5 MW 01 1/7/ <1 < < <0.5 MW 01 2/5/ <1 < < <0.5 MW 01 3/4/ <1 < < <0.5 MW 01 4/3/ <1 < < <0.5 MW 01 5/2/ <1 < < <0.5 MW 01 6/6/ <1 < < <0.5 MW 01 7/3/ <1 < < <0.5 MW 01 8/7/ <1 < < <0.5 MW 01 9/6/ <1 < < MW 01 10/3/ <1 < < MW 01 11/5/ <1 < MW 01 12/3/ <1 < Nitrate (as NO 3 ) Kjeldahl Sulfate Page 2 of 88

43 as CaCO 3 as CaCO 3 as CaCO 3 CaCO 3 Bromide Chloride Dissolved Iron MW 01 1/15/ <1 < < MW 01 2/6/ <1 < < MW 01 3/3/ <1 < < MW 01 4/7/ <1 < < MW 01 5/13/ <1 < < <0.5 MW 01 6/5/ <1 < < MW 01 7/9/ <1 < < MW 01 8/7/ <1 < < MW 01 9/7/ <1 < < <0.5 MW 01 10/5/ <1 < < <0.5 MW 01 11/2/ <1 < < <0.5 MW 01 12/2/ <1 < < MW 01 1/14/ <1 < < MW 01 2/2/ <1 < < MW 01 3/9/ <1 < < MW 01 4/6/ <1 < < MW 01 5/10/ <1 < < MW 01 6/6/ <1 < MW 01 7/22/ <1 < < MW 01 8/2/ <1 < MW 01 9/9/ <1 < MW 01 10/7/ <1 < < MW 01 11/11/ <1 < < MW 01 12/8/ <1 < < MW 01 1/5/ <1 < < MW 01 2/8/ <1 < < MW 01 3/13/ <1 < < MW 01 8/3/ <10 < MW 01 9/5/ <10 < MW 01 10/9/ <10 < MW 01 11/6/ <10 < MW 01 12/11/ <10 < MW 01 1/3/ <10 < MW 01 2/5/ <20 < MW 01 3/5/ <10 < Nitrate (as NO 3 ) Kjeldahl Sulfate Page 3 of 88

44 as CaCO 3 as CaCO 3 as CaCO 3 CaCO 3 Bromide Chloride Dissolved Iron MW 01 4/5/ <10 < MW 01 5/3/ <10 < MW 01 6/7/ <10 < MW 01 7/2/ <10 < MW 01 8/2/ <10 < MW 01 9/10/ <10 < MW 01 10/8/ <20 < MW 01 11/7/ <20 < MW 01 12/6/ <10 < MW 01 1/14/ <10 < MW 01 2/7/ <10 < < MW 01 3/4/ <10 < MW 01 4/10/ <10 < MW 01 5/5/ <10 < MW 01 6/3/ <20 < MW 01 7/1/ <20 < MW 01 8/5/ <10 < MW 01 9/8/ <5.0 < MW 01 10/9/ <10 < MW 01 11/4/ <10 < MW 01 12/3/ <10 < MW 01 1/13/ <8.2 < MW 01 2/4/ <8.2 < MW 01 3/4/ <8.2 < MW 01 4/14/ <8.2 < MW 01 5/4/ <8.2 < MW 01 6/9/ <8.2 < MW 01 7/14/ <8.2 < <0.050 Jo MW 01 8/4/ <8.2 < <0.05 Jo MW 01 9/8/ <16 < <0.050 Jo MW 01 10/6/ <8.2 < <0.050 Jo MW 01 11/10/ <8.2 < MW 01 12/8/ <8.2 < MW 01 1/5/ <4.1 < MW 01 2/10/ <8.2 < Nitrate (as NO 3 ) Kjeldahl Sulfate Page 4 of 88

45 as CaCO 3 as CaCO 3 as CaCO 3 CaCO 3 Bromide Chloride Dissolved Iron MW 01 3/8/ <8.2 < MW 01 4/15/ < MW 01 7/8/ < <0.05 Jo MW 01 10/27/ < <0.05 Jo MW 01 1/19/ < <0.05 Jo MW 01 4/4/ < <0.05 Jo MW 01 7/7/ < < MW 01 11/9/ < < J < J 1.99 J J J < MW 01 1/19/ <0.050 Jo MW 01 4/3/ < < < < <36.5 U MW 01 7/23/ < < < <0.25 U MW 01 10/15/2012 <150 U <5.0 <150 U <2.0 <30.6 U 42.1 J J J 116 J 54.7 J <29.2 U MW 01 1/22/ < < < < MW 01 4/16/ < < < MW 01 7/17/ < < < J <0.36 U MW 01 10/21/ < J J J MW 01 1/22/ < < <4.5 U MW 01 4/22/ < < J J 40.2 J 46.1 < MW 01 10/20/ < < < MW 01 4/15/ < J < J 1.07 J 123 J 103 J MW 01 10/15/ < < J < MW 01 4/14/ < < J J 48.1 < MW 01 10/12/ < < J <0.53 R MW 01 4/24/ < < MW 02 7/27/ MW 02 10/16/ MW 02 1/15/ MW 02 4/10/ MW 02 7/30/ MW 02 10/29/ MW 02 1/8/ MW 02 4/18/ MW 02 7/26/ MW 02 10/23/ MW 02 1/24/ Nitrate (as NO 3 ) Kjeldahl Sulfate Page 5 of 88

46 as CaCO 3 as CaCO 3 as CaCO 3 CaCO 3 Bromide Chloride Dissolved Iron MW 02 4/2/ MW 02 7/9/ <1 < < MW 02 10/6/ < MW 02 1/13/ MW 02 4/15/ MW 02 7/14/ < MW 02 10/11/ < MW 02 1/18/ < MW 02 4/19/ < MW 02 7/18/ < MW 02 11/14/ <1 < < MW 02 2/20/ <1 < < MW 02 5/11/ <1 < < MW 02 6/19/ < MW 02 7/11/ < MW 02 8/15/ < MW 02 11/14/ < MW 02 2/14/ < MW 02 5/21/ < MW 02 8/20/ < MW 02 11/19/ < MW 02 2/18/ < MW 02 5/20/ < MW 02 8/25/ < MW 02 11/20/ < MW 02 2/26/ < MW 02 5/19/ < MW 02 8/20/ < MW 02 11/24/ < MW 02 11/22/ < MW 02 2/11/ < MW 02 5/2/ <1 < <0.5 MW 02 9/21/ < MW 02 11/30/ <1 < < MW 02 12/14/ <1 < < Nitrate (as NO 3 ) Kjeldahl Sulfate Page 6 of 88

47 as CaCO 3 as CaCO 3 as CaCO 3 CaCO 3 Bromide Chloride Dissolved Iron MW 02 1/5/ <1 < < MW 02 2/2/ <1 < < <0.5 MW 02 3/18/ <1 < < <0.5 MW 02 4/17/ <1 < < <0.5 MW 02 5/21/ <1 < < MW 02 6/19/ <1 < < MW 02 7/17/ <1 < < <0.5 MW 02 8/2/ <1 < < <0.5 MW 02 9/5/ <1 < < MW 02 10/2/ <1 < < MW 02 11/6/ <1 < < MW 02 12/3/ <1 < < MW 02 1/4/ <1 < < MW 02 2/5/ <1 < MW 02 3/4/ <1 < < MW 02 4/2/ <1 < < <0.5 MW 02 5/7/ <1 < < MW 02 6/4/ <1 < < MW 02 7/2/ <1 < < <0.5 MW 02 8/8/ <1 < < MW 02 9/3/ <1 < < MW 02 10/8/ <1 < < MW 02 11/5/ <1 < < MW 02 12/6/ <1 < MW 02 1/6/ <1 < < MW 02 2/5/ <1 < < MW 02 3/4/ <1 < < <0.5 MW 02 4/3/ <1 < < <0.5 MW 02 5/5/ <1 < MW 02 6/6/ <1 < <0.5 MW 02 7/3/ <1 < < <0.5 MW 02 8/7/ <1 < MW 02 9/5/ <1 < < MW 02 10/3/ <1 < MW 02 11/5/ <1 < < Nitrate (as NO 3 ) Kjeldahl Sulfate Page 7 of 88

48 as CaCO 3 as CaCO 3 as CaCO 3 CaCO 3 Bromide Chloride Dissolved Iron MW 02 12/4/ <1 < MW 02 1/15/ <1 < < MW 02 2/6/ <1 < < MW 02 3/4/ <1 < MW 02 4/8/ <1 < < MW 02 5/14/ <1 < MW 02 6/5/ <1 < MW 02 7/9/ <1 < < MW 02 8/7/ <1 < < MW 02 9/7/ <1 < < <0.5 MW 02 10/5/ <1 < < MW 02 11/2/ <1 < < MW 02 12/2/ <1 < < MW 02 1/14/ <1 < MW 02 2/2/ <1 < MW 02 3/9/ <1 < MW 02 4/6/ <1 < < MW 02 5/10/ <1 < MW 02 6/6/ <1 < MW 02 7/22/ <1 < MW 02 8/2/ <1 < MW 02 9/6/ < MW 02 10/5/ <1 < MW 02 11/11/ <1 < MW 02 12/8/ <1 < < MW 02 1/6/ <1 < MW 02 2/8/ < MW 02 3/13/ <1 < MW 02 8/3/ <10 < MW 02 9/5/ <10 < MW 02 10/9/ <10 < MW 02 11/6/ <10 < MW 02 12/11/ <10 < MW 02 1/3/ <10 < MW 02 2/5/ <20 < Nitrate (as NO 3 ) Kjeldahl Sulfate Page 8 of 88

49 as CaCO 3 as CaCO 3 as CaCO 3 CaCO 3 Bromide Chloride Dissolved Iron MW 02 3/5/ <20 < MW 02 4/5/ <20 < MW 02 5/3/ <10 < MW 02 6/7/ <10 < MW 02 7/2/ <10 < MW 02 8/2/ <10 < MW 02 9/10/ <10 < MW 02 10/8/ <20 < MW 02 11/7/ <20 < MW 02 12/6/ <10 < MW 02 1/14/ <10 < MW 02 2/7/ <10 < < MW 02 3/4/ <10 < MW 02 4/10/ <20 < MW 02 5/5/ <20 < MW 02 6/3/ <20 < MW 02 7/1/ <20 < MW 02 8/5/ <20 < MW 02 9/8/ <10 < MW 02 10/9/ <5.0 < MW 02 11/4/ <10 < MW 02 12/3/ <10 < MW 02 1/13/ <8.2 < MW 02 2/4/ <8.2 < MW 02 3/4/ <8.2 < MW 02 4/14/ <8.2 < MW 02 5/4/ <8.2 < MW 02 6/9/ <8.2 < MW 02 7/14/ <8.2 < MW 02 8/4/ <8.2 < MW 02 9/8/ <8.2 < MW 02 10/6/ <4.1 < MW 02 11/10/ <8.2 < MW 02 12/8/ <8.2 < MW 02 1/5/ <4.1 < Nitrate (as NO 3 ) Kjeldahl Sulfate Page 9 of 88

50 as CaCO 3 as CaCO 3 as CaCO 3 CaCO 3 Bromide Chloride Dissolved Iron MW 02 2/10/ <4.1 < MW 02 3/8/ <8.2 < MW 02 4/15/ < MW 02 7/8/ < MW 02 10/27/ < MW 02 1/19/ < MW 02 4/4/ < MW 02 7/7/ < MW 02 11/9/ < < J < J 1.26 J J J < MW 02 1/19/ <0.050 Jo MW 02 4/3/2012 <140 U <5.0 <140 U < < J <19.7 U MW 02 7/23/ < < <0.71 U MW 02 10/15/2012 <128 U <5.0 <128 U <1.0 <38.7 U 22.6 J < J J 96.1 J 54.4 J <16.0 U MW 02 1/22/2013 <120 U <5.0 <120 U < < < MW 02 4/16/ < < < < < MW 02 7/17/ < < < J < MW 02 10/21/ < J < J J 19.3 < MW 02 1/22/ < < <0.51 U MW 02 4/22/ < J < J J 56.4 J 49.2 < J 34.4 MW 03 10/29/ MW 03 1/8/ MW 03 4/18/ MW 03 7/26/ MW 03 10/23/ MW 03 1/24/ MW 03 4/2/ < MW 03 7/9/ <1 < < MW 03 10/6/ < MW 03 1/13/ MW 03 4/15/ MW 03 7/14/ < MW 03 10/11/ MW 03 1/18/ < MW 03 4/19/ < MW 03 7/18/ < Nitrate (as NO 3 ) Kjeldahl Sulfate Page 10 of 88