2022 CCR Annual Groundwater Report

Page 1

Technical Memorandum

To: Eric Holder, Independence Power & Light

From: Andrea Collier and Tony Schroer, Barr Engineering Co.

Subject: 2022 Blue Valley Facility CCR Impoundment Groundwater Monitoring Report

Date: January 26, 2023

Project: 25491019.00

c: James Barry, Independence Power & Light Rob Morrison, Barr Engineering Co.

1.0 Introduction

On behalf of the Independence Power and Light (IPL), Barr Engineering Co. (Barr) has prepared this 2022 Groundwater Monitoring Report for the IPL Blue Valley Power Plant Facility located at 21500 East Truman Road in Independence, Missouri (Site) (Figure 1 in Attachment A).

Project activities conducted in March, June, September and December 2022 included routine groundwater monitoring and well inspections. This report presents the field data and analytical results for all Quarterly 2022 monitoring events.

1.1 Site Background

The Facility was constructed in 1958 as a tri-fuel steam electric power plant that burned coal, diesel, and natural gas until 2015, when it ceased power production from coal and diesel and was converted to a natural gas facility. All three of the former coal combustion residuals (CCR) impoundments were constructed in an upland area directly north of the plant. Two of the original CCR impoundments, the south fly ash pond, and bottom ash pond were built in 1978. The north fly ash pond was constructed in 1989. The Facility sluiced bottom ash and fly ash into the ponds until September 09, 2015. Upon the discontinuation of ash sluicing into the CCR impoundments, the former impoundments became “inactive surface impoundments” subject to the requirements of the Federal CCR Rule, 40 CFR 257.100, Subpart D. The three impoundments were closed and capped with an impermeable synthetic liner, and the Notice of Closure Completion for the former impoundments was submitted to MDNR in December 19, 2017.

The Site is located approximately seven miles south of the Missouri River and 0.75 miles west of the Little Blue River in the north central portion of Jackson County at 21500 East Truman Road in Independence, Missouri in Section 3, Township 49N, and Range 31W. Figure 2 displays the Site location and impoundment boundary. The Site is located within the Central Irregular Plains Ecoregion of west central Missouri. Potential natural vegetation of this ecoregion includes a mix of grassland and forest, with forested areas particularly located along streams (Purdue, 2020). Land use adjacent to the Site, displayed on Figure 2 (Attachment A), is primarily industrial and agricultural, with industries located north, south,

Barr Engineering Co. 325 South Lake Avenue, Duluth, MN 55802 218.529.8200 www.barr.com

To: Eric Holder, Independence Power & Light

From:

Subject: 2022 Blue Valley Facility CCR Impoundment 2022 Blue Valley Facility CCR Impoundment Groundwater

Monitoring Report

Date: January 26, 2023

Page: 2

and west of the Site and agricultural land located to the east. An isolated residential area is also located north of the Site.

Regional topography is characterized by hills and associated dendritic drainage patterns with approximately 150 feet of relief within one mile of the Site. Hills north and west of the Facility have elevations as high as 900 feet above mean sea level (MSL). The Site has features with elevations that range from approximately 750 to 800 feet above MSL and slope from the northwest to southeast (Figure 1 in Attachment A). A topographic divide, located in the southwest portion of the Site, separates the Little Blue River and Burr Oak-Creek-Little Blue River subwatersheds (Hydrologic Unit Code 12).

1.2 Regional Geology

The surficial soils of the region and portions of the Site outside the former impoundments consist primarily of unconsolidated alluvial sediments known as the Sibley Silt Loam series. According to the Soil Survey of Jackson County, Missouri (1984) developed by the United States Department of Agriculture (USDA), the Sibley Silt Loam is a friable, moderate permeability soil with naturally high fertility (USDA, 1984). The surface layer is generally dark brown, the middle sections can be dark brown to grey, and the lower sections are generally more clayey and dark yellowish-brown with various mottles.

Based on the report, City of Independence, Missouri, Blue Valley Generating Station Ash Pond Addition and Other Improvements (Burns and McDonnell, 1977), the subsurface soil in the proximity of the former impoundments consists primarily of silty clay with interbedded seams of fine-grained, uncompacted sandy silt. The report provides descriptive logs for 27 borings drilled in a grid pattern encompassing the area of the former fly ash and bottom ash ponds. The borings ranged in depth from 10 feet to 64 feet bgs. Additional investigation activities were performed in 2019 and documented in the Site Characterization Report (Barr, 2020). Borings drilled during the site characterization work indicated the presence of natural coal and oil deposits in the subsurface formations surrounding the former impoundments.

The bedrock underlying the region and Site consists of Pennsylvanian aged shales, limestones, sandstone, and siltstones with interbedded coal seams. Naturally occurring crude oil was identified in upgradient borings during the Site Characterization performed in 2020. The Pennsylvanian-aged shales overly older Mississippian aged formations (MDNR, 1997).

The Pennsylvanian-aged Pleasanton Group is the first bedrock unit encountered in the region, located approximately 25 feet bgs. The Pleasanton Group is predominantly a thick unit of shale with limestone and a basal unit of siltstone or very fined-grained sandstone. Two additional sandstone units, which combined are known as the Warrensburg Sandstone, are sometimes present in the upper half of the group depending on the location. The base of the Pleasanton Group marks a break in the depositional sequence occurring in the Pennsylvanian time. This break in the depositional sequence forms a regional

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To: Eric Holder, Independence Power & Light

Subject: 2022 Blue Valley Facility CCR Impoundment 2022 Blue Valley Facility CCR Impoundment Groundwater

Monitoring Report

Date: January 26, 2023

Page: 3

disconformity. Underlying the Pleasanton Group bedrock unit is the Marmaton Group. The Marmaton Group is comprised mainly of thick shales with intervening thin layers of limestone and sandstone.

1.3 Regional Hydrogeology

The hydrogeology in the area of the Site is represented by the Missouri River alluvium and Lake City alluvium, two groundwater subprovinces of the West-Central groundwater province. The Site is primarily located within the Missouri River alluvium, which borders the Lake City alluvium east of the Site near the Little Blue River. Information describing the West-Central groundwater province and each subprovince is provided below.

The West-Central groundwater province is bounded by the Missouri River to the north, the Springfield Plateau groundwater province to the south and east, and the Kansas state boundary to the west. The greatest potential for groundwater yield within this province is from the alluvial deposits along the northern edge of the province, which include the Missouri River alluvium and Lake City alluvium, further described below. Pennsylvanian-aged formations comprise the bedrock surface units for most of this groundwater province, specifically the Pleasanton and Marmaton Groups in the area of the Site. The Pleasanton and Marmaton Groups in the region have low recharge potential due to their extremely low horizontal and vertical permeabilities and are not considered to be water bearing; the Pleasanton Group is considered to be less productive than the Marmaton Group (MDNR, 2021). Of the small amounts of groundwater that may potentially be drawn from these groups, the groundwater is expected to be of poor quality.

The Missouri River alluvium province is located at the northern portion of the West-Central groundwater province and extends for the entire length of the Missouri River throughout the state with an aerial extent of approximately 440 square miles in the vicinity of the Site. The Missouri River alluvium formed from glacial meltwater runoff during the Pleistocene epoch (Ice Age); the melt water transported a significant amount of sediments that ranged in size from clay particles to boulders, which carved a river channel much wider than the channel occupied by the Missouri River today. Following the Pleistocene epoch, over-bank flooding of present-day rivers has deposited additional alluvium on river floodplains. The Missouri River and the Missouri River alluvium province experience delayed recharge; studies of wells within the alluvium indicated a delayed response of several days between river stages and groundwater levels. Under normal flow conditions in the Missouri River, groundwater gradients in the Missouri River alluvium are toward the river (MDNR, 1997).

In the report Groundwater Resources of Missouri (MDNR, 1997), the Missouri River alluvium is divided into four segments from the Iowa border to St. Charles, prior to the Missouri River and Mississippi River confluence. For the purpose of this project, the portion of the Missouri River alluvium province discussed in this section is the Kansas City to Miami, Missouri segment. The Missouri River alluvium in this segment composed primarily of fine sand, silt, and clay with coarse sands and gravels comprising the deeper portions of the alluvium. The alluvium has a maximum thickness of 140 feet and an average thickness of

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To: Eric Holder, Independence Power & Light

Subject: 2022 Blue Valley Facility CCR Impoundment 2022 Blue Valley Facility CCR Impoundment Groundwater

Monitoring Report

Date: January 26, 2023

Page: 4

85 to 90 feet. The average saturated thickness of the alluvium is approximately 75 feet for this area Groundwater from wells within the Missouri River alluvium supplies a majority of the potable water in the Kansas City area. Yields from the Missouri River alluvium may reach 1,000 to 1,500 gallons per minute (gpm) in the more permeable areas of the alluvium (MDNR, 1997).

The Lake City alluvium groundwater subprovince is a 16-mile-long, 1-2-mile-wide channel that begins at the southern edge of the Missouri River alluvium in central Jackson County near the town of Atherton, extends southeast to Lake City, and then trends northeast until it again intersects with the Missouri River alluvium in northeastern Jackson County near the town of Levasy. The Lake City alluvial channel likely formed as a result of an ice damming event on the ancestral Missouri River, which forced the river south of the existing channel and eroded the new channel, which currently serves as the river valley for the Little Blue River from Lake City to the Missouri River. The Site is located on the western edge of the Lake City alluvium channel. A study of this alluvium aquifer at the Lake City Army Ammunition Plant in the early 1940s estimated the alluvium’s thickness to 80 to 90 feet with a depth to water of 15 to 20 feet bgs. Well pumping rates during this study reached 300 to 400 gpm (MDNR, 1997).

2.0 Hydrogeologic Data and Monitoring

Hydrogeologic monitoring at the Site includes the collection of groundwater elevation data from Site monitoring wells. The monitoring well locations at the Site are shown on Figure 3 (Attachment A) and well construction information is located in Table 1 (Attachment B).

2.1 Potentiometric Surface Measurements

During all four Quarterly 2022 monitoring events, water-levels were collected from the eight (8) routinely scheduled groundwater monitoring wells. The resultant elevation data were used to develop potentiometric surface flow maps, assess flow direction, and calculate gradients for the shallow groundwater. A summary of all groundwater elevation data is included as Table 2.

2.2 Groundwater Flow Direction and Gradient

The groundwater elevation data from the Site’s shallow monitoring wells were contoured to construct potentiometric surface maps for each quarterly event. As graphically illustrated on Figures 4, 5, 6, and 7 groundwater flows towards the east which is consistent with historic water elevation data for the Site

The calculated hydraulic gradient for each of the Quarterly 2022 monitoring events is provided below:

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To: Eric Holder, Independence Power & Light

Subject: 2022 Blue Valley Facility CCR Impoundment 2022 Blue Valley Facility CCR Impoundment Groundwater

Monitoring Report

Date: January 26, 2023

Page: 5

Hydraulic gradients measured across the Site range from -0.001 to 0.01 (range for gradients from three different areas of the Site ) for the Quarterly 2022 groundwater elevation data (Table 2 -Attachment B). The hydraulic gradient measured across the northwestern portion of the Site (MW-6 to MW-8) was calculated to be -0.001 for March 2022, 0.003 for June 2022, 0.003 for September 2022, and 0.0005 for November 2022. The hydraulic gradient measured across the northeastern portion of the Site (MW-1 to MW-8) was calculated to be 0.003 for March 2022, 0.003 for June 2022, 0.005 for September 2022, and 0.0009 for November 2022. The hydraulic gradient measured across the central portion of the Site (MW-6 to MW-1) was calculated to be 0.0005 for March 2022, 0.003 for June 2022, 0.005 for September 2022, and 0.01 for November 2022. It should be noted that water levels measured in the upgradient wells may not be representative of actual static water levels since stabilization subsequent to purging can take several weeks. The water level measured for MW-6 during the March sampling event was not utilized for hydraulic gradient measurements because the water level had not fully re-stabilized.

The average hydraulic gradient is towards the east with a slope of approximately 0.002 for March, 0.003 for June, 0.004 for September, and 0.005 for November across the entire Site. This slope is relatively shallow as compared to previous years (2019, 2020, 2021) likely due to the varying water elevations in the upgradient monitoring wells. An approximate average interstitial velocity across the Site has been estimated to range from 2.4 x 10-3 feet/day to 6.7 x 10-4 feet/day (i.e. 0.88 to 0.24 feet/year) for March 2022, 5.0 x 10-3 feet/day to 1.4 x 10-3feet/day (i.e. 1.8 to 0.5 feet/year) for June 2022, 7.22 x 10-3 feet/day to 1.99 x 10-3 feet/day (i.e. 2.6 to 0.7 feet/year) for September 2022, and 8.0 x 10-3 feet/day to 2.2 x 10-3 feet/day (i.e. 2.9 to 0.8 feet/year) for November 2022 as calculated by the following equation and input data:

v = Ki/n, where

v = average interstitial velocity

K = hydraulic conductivity (ranges from 0.388 to 0.171 feet/day)

i = average hydraulic gradient across the Site (0.005)

n = effective porosity (estimated to range from 0.25 to 0.4)

P:\Jeff City\25 MO\49\25491019 Groundwater Monitoring Program\WorkFiles\2022\2022 Federal GW Technical Memorandum\3 - Final Version\FINAL_IPLFederalGWTechMemo012423.docx Monitoring Event Hydraulic Gradient North Side (West) (MW-6 to MW-8) North Side (East) (MW-8 to MW-1) East Side (MW-6 to MW-1) March2022 NA 0.003 0.0005 June2022 0.003 0.003 0.004 September2022 0.003 0.005 0.005 November2022 0.005 0.0009 0.01

To: Eric Holder, Independence Power & Light

Subject: 2022 Blue Valley Facility CCR Impoundment 2022 Blue Valley Facility CCR Impoundment Groundwater

Monitoring Report

Date: January 26, 2023

Page: 6

2.3 Groundwater Hydrographs

Overall, groundwater elevations measured in wells during all Four Quarters of 2022 monitoring events were relatively consistent with the data from the measurements taken during the previous events (Barr, 2020, 2021). Hydrographs of the groundwater elevations is provided in Attachment C

Due to the relatively higher recharge rates the downgradient well groundwater elevations have not changed significantly from previous monitoring periods. The greatest variance of water level elevations observed in the downgradient wells during 2022 is 4.41 feet in monitoring well MW-1. This groundwater elevation change represents measurements with seasonal flux and significantly drier/wetter periods. The groundwater elevations observed during the September sampling event showed the greatest seasonal flux of the four events.

The groundwater elevation fluctuations in the upgradient wells are significantly more prominent than the changes observed in the downgradient wells, however this may be primarily due to the slow recharge times of the upgradient wells. During several monitoring events the water levels measured immediately prior to sampling in the upgradient wells did not appear to be stabilized subsequent to purging. The groundwater elevations for the upgradient wells have been observed to change up to 25.4 feet (MW-7) between groundwater sampling events.

Groundwater levels for active monitoring wells are presented in Table 2 (Attachment B).

2.4 Groundwater Monitoring Network

No modifications have been made to the monitoring network since well installation in 2019.

3.0 Groundwater Sampling and Field Activities

The field methods for the collection of the samples are described in the Groundwater Monitoring Sampling and Analysis Plan (GMSAP) (Barr, 2021).

3.1 Well Inspections

During the 2022 monitoring events, the sampling crew measured the static water levels in each of the eight active monitoring wells at the site and visually inspected each well’s condition. Any evidence of well damage was documented in the field documents (Attachment D). Table 1 (Attachment B) contains a summary of the monitoring well construction including well number designation, measured total depth, elevation for top of screen, and the measured static water level for each well.

3.2 Sample Collection

Groundwater samples were collected at four quarterly sampling events (March 2022, June 2022, September 2022, November 2022) from the eight active monitoring wells at the Site. Groundwater sampling was conducted using bailers and low stress (low flow) methodology in compliance with the GMSAP (Barr, 2021). For the wells sampled via low stress (low flow) methodology, a submersible pump

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To: Eric Holder, Independence Power & Light

Subject: 2022 Blue Valley Facility CCR Impoundment 2022 Blue Valley Facility CCR Impoundment Groundwater Monitoring Report

Date: January 26, 2023

Page: 7

was lowered into the well screen and pumped at the lowest possible rate until measurements of temperature, pH, specific conductivity, dissolved oxygen, turbidity, and ORP stabilized. These parameters can be found on the field logs in Attachment D. The low flow sampling was performed in compliance with Section 3.0, Section 4.0, and Appendix D of the GMSAP.

For the wells sampled via bailers, the wells were purged at least three weeks prior to the sampling events. During the sampling event the bailers were extracted from the wells and the samples collected. Water quality parameters were collected via bailer immediately subsequent to the sample collection.

For quality control (QC) purposes duplicate samples were collected during each sampling event. During all four sampling events, duplicate samples were collected from downgradient well MW-1 for the March sampling event, MW-5 for the June and September sampling events, and MW-8 for the November sampling event.

4.0 Groundwater Analytical Results

4.1 March 2022

Groundwater samples were collected at all monitoring wells installed at the Site. Table 3 (Attachment B) summarizes the groundwater concentration data from the wells and compares the concentrations against EPA’s MCLs (40 CFR 141.62 and 257.95). Groundwater samples from the March 2022 sampling event that exceeded EPA’s MCLs are shown on Figure 8 (Attachment A).

Groundwater concentration exceedances of the EPA MCLs for total arsenic and total/dissolved lithium were identified in some of the samples. The following list summarizes the exceedances for each constituent:

• Total arsenic: Groundwater concentrations exceeded the arsenic MCL of 10 µg/L at downgradient monitoring wells MW-1, MW-3, and MW-4. Total arsenic concentrations at the wells ranged from 24.2 to 23.8 µg/L.

• Total and dissolved lithium: Groundwater concentrations exceed the lithium MCL of 40 10 µg/L at upgradient monitoring well MW-8. The total lithium concentration at the MW-8 was 408 µg/L, whereas the dissolved lithium concentration was 421 µg/L.

4.2 June 2022

During the June 2022 sampling event, groundwater samples were collected from all eight monitoring wells installed at the Site. Groundwater samples from the June 2022 sampling event that exceeded EPA’s MCLs on Figure 5 (Attachment A).

Groundwater concentration exceedances of the EPA MCLs for dissolved/total arsenic, dissolved/total antimony, and dissolved/total lithium were identified in some of the samples. The following list summarizes the exceedances for each constituent:

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To: Eric Holder, Independence Power & Light

Subject: 2022 Blue Valley Facility CCR Impoundment 2022 Blue Valley Facility CCR Impoundment Groundwater Monitoring Report

Date: January 26, 2023

Page: 8

• Dissolved and total arsenic: groundwater concentrations exceeded the arsenic MCL of 10 µg/L at downgradient monitoring wells MW-1 (total only), MW-3, and MW-4. Total arsenic concentrations at these three wells ranged from 11.9 to 41.1 µg/L. Dissolved arsenic concentrations at these three wells ranged from 11.9 to 15.2 µg/L.

• Dissolved and total antimony: Groundwater concentrations at upgradient wells MW-8 exceeded the antimony MCL of 6 µg/L. The dissolved and total antimony concentrations at well MW-8 were 26.3 µg/L and 27.6 µg/L, respectively.

• Total and dissolved lithium: Groundwater concentrations exceed the lithium MCL of 40 10 µg/L at upgradient monitoring wells MW-6, MW-7, and MW-8. The total lithium concentrations for wells MW6, MW-7, and MW-8 were 65.5, 105, and 112 µg/L respectively. The dissolved lithium concentrations for wells MW-6, MW-7, and MW-8 were 60, 111, and 104 µg/L respectively.

4.3 September 2022

Groundwater samples were collected at all monitoring wells installed at the Site. Table 3 (Attachment B) summarizes the groundwater concentration data from the wells and compares the concentrations against EPA’s MCLs (40 CFR 141.62 and 257.95). Groundwater samples from the September 2022 sampling event that exceeded EPA’s MCLs are shown on Figure 6 (Attachment A).

Groundwater concentration exceedances of the EPA MCLs for dissolved/total arsenic and dissolved/total lithium were identified in some of the samples. The following list summarizes the exceedances for each constituent:

• Dissolved and total arsenic: Groundwater concentrations exceeded the arsenic MCL of 10 µg/L at downgradient monitoring wells MW-3 and MW-4. Dissolved arsenic concentrations at these two wells ranged from 10.8 to 16.6 µg/L and total arsenic concentrations at the wells ranged from 26.4 to 41.5 µg/L.

• Total and dissolved lithium: Groundwater concentrations exceed the lithium MCL of 40 10 µg/L at upgradient monitoring wells MW-6, MW-7, and MW-8. The total lithium concentrations for wells MW6, MW-7, and MW-8 were 47, 45.4, and 123 µg/L respectively. The dissolved lithium concentrations for wells MW-6, MW-7, and MW-8 were 48.2, 47.1, and 117 µg/L respectively.

4.4 November 2022

During the November 2022 sampling event, groundwater samples were collected from all eight monitoring wells installed at the Site. Groundwater samples from the November 2022 sampling event that exceeded EPA’s MCLs on Figure 7 (Attachment A).

Groundwater concentration exceedances of the EPA MCLs for total arsenic and dissolved/total lithium were identified in some of the samples. The following list summarizes the exceedances for each constituent:

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To: Eric Holder, Independence Power & Light

From:

Subject: 2022 Blue Valley Facility CCR Impoundment 2022 Blue Valley Facility CCR Impoundment Groundwater Monitoring Report

Date: January 26, 2023

Page: 9

• Total arsenic: groundwater concentrations exceeded the arsenic MCL of 10 µg/L at downgradient monitoring wells MW-3 and MW-4. Total arsenic concentrations at these two wells ranged from 36 to 42.5 µg/L.

• Total and dissolved lithium: Groundwater concentrations exceed the lithium MCL of 40 10 µg/L at upgradient monitoring wells MW-6, MW-7, and MW-8. The total lithium concentrations for wells MW6, MW-7, and MW-8 were 41.8, 45.2, and 117 µg/L respectively. The dissolved lithium concentrations for wells MW-6, MW-7, and MW-8 were 40.8, 43.5, and 106 µg/L respectively.

5.0 Conclusions and Recommendations

The results of the 2022 groundwater sampling events at the Site have been summarized in the previous sections and the conclusions and recommendations based on those results are outlined in the following paragraphs.

5.1 Site Groundwater

Upgradient and downgradient groundwater sample concentrations indicate that the groundwater contains metals concentrations. The metals concentrations for antimony, arsenic, and lithium exceed the MCLs in some of the upgradient and downgradient wells. As discussed in the Site Characterization Report (Barr, 2020), the subsurface materials, including native coal and oil deposits, at the Site contain concentrations of metals that exceed the MRBCA Default Target Levels. In addition, boron, a metal that is typically associated with the presence of CCR materials , is present at significantly higher concentrations upgradient of the former impoundments (1,171 µg/L on average) than downgradient (527.8 µg/L on average). Therefore, the native soil around the former impoundments is likely to be a source for metals in the groundwater.

As a result, groundwater monitoring in compliance with the proposed GMSAP will be utilized to continue monitoring these and other parameters to identify their potential source, concentrations trends, and representativeness in the shallow groundwater.

5.2 Groundwater Flow

Results of the Site Characterization Report (Barr, 2020) indicates that the shallow groundwater underlying the site migrates slowly due to the fine-grained nature/low permeability of the unconsolidated units underlying the former impoundments.

The groundwater data continues to be consistent with previous observations made regarding groundwater flow and direction. The groundwater flow at the Site is primarily to the east/southeast and groundwater underlying the former impoundments migrates primarily through the sand layers in the unconsolidated units.

Since groundwater contact with the impoundment material is limited, it is unlikely that leaching of metals from CCR materials is occurring via lateral groundwater movement through the former impoundment. In

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To: Eric Holder, Independence Power & Light

From: Andrea Collier and Andrea Collier and Tony Schroer, Barr Engineering Co.

Subject: 2022 Blue Valley Facility CCR Impoundment 2022 Blue Valley Facility CCR Impoundment Groundwater Monitoring Report

Date: January 26, 2023

Page: 10

addition, to date, groundwater elevations measured from groundwater wells do not indicate that groundwater is migrating through CCR materials in the northwest corner of the impoundment area. Therefore, the potential for COCs to migrate is primarily via vertical leaching of the low volumes of meteoric water that have infiltrated through the engineered cap.

6.0 References

Barr, 2021. Blue Valley Coal Combustion Residuals Impoundment Groundwater Monitoring Sampling and Analysis Plan, Independence Power and Light Blue Valley Power Plant, Independence, Missouri. July 2021.

Barr, 2020. Blue Valley Coal Combustion Residuals Impoundment Site Characterization Report, Independence Power and Light Blue Valley Power Plant, Independence, Missouri. May 2020.

Burns and McDonnell, 1977. City of Independence, Missouri, Blue Valley Generating Station Ash Pond Addition and Other Improvements, May 1977.

Freeze, R. A. and J. A. Cherry, 1979. Groundwater, Prentice-Hall, Inc., Englewood Cliffs, New Jersey, 604p.

Missouri Department of Natural Resources, 2021. Geosciences Technical Resources Assessment Tool Website, URL: https://dnr.mo.gov/geology/geostrat.htm. Accessed January 2020.

Missouri Department of Natural Resources Division of Geology and Land Survey, 1997. Groundwater Resources of Missouri, Don E. Miller, 1997.

Purdue University, 2020. Primary Distinguishing Characteristics of Level III Ecoregions of the Continental United States Website, URL: https://hort.purdue.edu/newcrop/cropmap/ecoreg/descript.html#40 Accessed July – September, 2019.

US Department of Agriculture, 1984. Soil Survey of Jackson County, Missouri. September 1984

Attachments

Attachment A – Figures

Attachment B – Tables

Attachment C – Hydrographs

Attachment D – Field Data

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Figures

Attachment A

Perennial

Intermittent

Property

Freshwater

Freshwater

Freshwater

Jackson County
Lower Missouri-Crooked 10300101 HUC12: Burr Oak Creek-Little Blue River HUC12: Burr Oak Creek-Little Blue River 103001010207 103001010207 HUC12: Little Blue River HUC12: Little Blue River 103001010208 103001010208 UnnamedT ributarytoLittleBlue River WestFirePrairieCreek Little Blue River Burr Oak Creek Spring Branch Creek 7 FF 78 7 78 78 £ ¤ 24 Copyright:© 2013 National Geographic Society, i-cubed Barr Footer: ArcGIS 10.7.1, 2020-04-10 09:33 File: I:\Projects\25\49\1019\Maps\Reports\Characterization_Report\Figure 1-1 Site Location.mxd User: MRQ SITE LOCATION Independence Power & Light Independence, Missouri FIGURE 1 0 1,000 2,000 3,000 Feet ! ; N
Stream or River
HUC8:
Stream, River, or Wash
Boundary
Boundary
HUC12 Watershed
Wetlands (NWI)
Wetland
Emergent
Shrub Wetland
Forested/
Pond Other Riverine

North Fly Ash Impoundment (Closed)

Earley Machine LLC Earley Machine LLC

HEMCO Corporation HEMCO Corporation

Independence Independence School District School District Transportation Complex Transportation Complex

South Fly Ash Impoundment (Closed) Bottom Ash Impoundment (Closed)

Bottom Ash Impoundment (Clean Closure and Converted to a Sedimentation Basin)

Midwest Directional Midwest Directional Services Services

Continental Continental Manufacturing Manufacturing Watco Manufacturing Co. Watco Manufacturing Co.

Metal Sale Metal Sale Manufacturing Corporation Manufacturing Corporation

Barbour Concrete Company Barbour Concrete Company

! ! 13TH TER RANSON ST RANSON PL LITTLE BLUE PKWY 78
POWELL RD 4TH ST POWELL RD
TRUMAN RD
Railroad Barr Footer: ArcGIS 10.8.1, 2022-01-18 12:17 File: I:\Projects\25\49\1019\Maps\Reports\Federal_Groundwater_Tech_Memo\Figure 2 Site Layout.mxd User: MRQ SITE LAYOUT Independence Power & Light Independence, Missouri FIGURE 2 0 450 Feet ! ; N Closed Railroad Property Boundary
Closed Union Pacific
Note: Property boundary obtained from Jackson County parcel dataset, MO GIS Department. Imagery: Nearmap, February 2020
! ! ! ! ! > ! ! ! L I T T L E B L U E P K W Y 78 TRUMAN RD P O W E L L R D 4TH ST P O W E L L R D Closed Union Pac i f ic Railroad MW-7 MW-6 MW-8 MW-5 MW-1 MW-3 MW-4 MW-2 Barr Footer : ArcGIS 10 8 1, 2022-09-21 11:17 File I:\Projects\25\49\1019\Maps\Repor ts\MDNR Base ine Su mmar y Repor t 2022\Figure 3 Monitoring Well Locations mxd User : kac2 MONITO RING W ELL LO CATI ONS Independence Power & Light Independence, Mis souri FIGU RE 3 0 175 350 525 Feet ! ; N ! Downgra dient Mo nitoring Well ! ? Upg ra dient Mo nitoring Well Proper ty Bo undar y Clo sed Railroad Note: Property boundar y obtained from Jackson County parcel dataset MO GIS Depar tment Imager y: Nearmap, September 2021
Attachment B Tables
TopBottom MW-16/26/2019Permanent 756.09758.542.458.252 Schedule40 PVC 741.09721.09 MW-26/25/2019Permanent 752.94755.452.518.252 Schedule40 PVC 737.94717.94 MW-36/25/2019Permanent 749.09751.632.548.252 Schedule40 PVC 734.09714.09 MW-46/25/2019Permanent 749.49751.171.688.252 Schedule40 PVC 737.49707.49 MW-58/5/2019Permanent 756.63758.812.1862 Schedule40 PVC 710.63700.63 MW-68/2/2019Permanent 774.29776.011.7262 Schedule40 PVC 708.29703.29 MW-78/4/2019Permanent 776.5778.291.7962 Schedule40 PVC 696.5686.5 MW-88/2/2019Permanent 770.69772.611.9262 Schedule40 PVC 138.53128.53 Notes: (1) Elevations were surveyed on 5/5/2020. Riser Pipe Material Screened Interval (Feet) 1 Borehole Diameter (Inches) Riser Pipe Diameter (Inches) Well ID Surface Elevation (Feet) 1 Riser Elevation (Feet) 1 Riser Height (Feet) 1 Installation Date Well Type
TABLE 1 MONITORING WELL CONSTRUCTION SUMMARY

*MW-7 had not fully recharged during these sampling events.

2
Elevation Summary Depth to Water (ft) Water Level Elevation (ftMSL) Depth to Water (ft) Water Level Elevation (ftMSL) Depth to Water (ft) Water Level Elevation (ftMSL) Depth to Water (ft) Water Level Elevation (ftMSL) MW-1758.548.13750.418.27750.2712.54746.009.40749.14 MW-2755.455.79749.665.41750.046.82748.636.24749.21 MW-3751.634.89746.746.35745.288.58743.055.41746.22 MW-4751.173.70747.475.42745.757.25743.926.77744.40 MW-5758.819.45749.369.16749.6512.18746.6311.34747.47 MW-6776.0125.00751.0121.44754.5723.91752.1025.89750.12 MW-7778.2943.4*734.8940.54*737.7519.01759.2817.96760.33 MW-8772.6120.51752.1020.25752.3623.26749.3522.88749.73
Table
Groundwater
September 2022November 2022 Location Top of Riser (ft-MSL) March 2022June 2022

2021-2022 Groundwater Analytical Summary

ExceedanceKeyBold

GeneralParameters

Carbon,totalorganicNAug/l1500200023002300160018001600J1000<1000U1100120014001300180018001400190016001700 ChemicalOxygenDemandNAug/l146001630010400<10000U11300<10000U<10000U13300<10000U<10000U18500<10000U10200<10000U<10000U<10000U13800<10000U<10000U ChlorideNAug/l79600796008030078800743005910069900453004340037800J434004610055700184001910019700195001990019800 FluorideNAug/l40002901200210220<200U<200U<200U<200U<200U<200U<200U<200U<200U550<200U500250<200U<200U Hardness,asCaCO3NAug/l382000443000424000425000420000330000378000556000619000610000579000588000614000525000559000547000518000499000521000 Nitrogen,nitrate+nitrite,asNNAug/l10000120<100U<100UH<100UH<100U<100U<100U<100U<100U<100UH<100U<100U<100U<100U<100U<100UH<100U<100U<100U Nitrogen,nitrate,asNNAug/l10000120<100U<100UH<100UH<100U<100U<100U<100U<100U<100UH<100U<100U<100U<100U<100U<100UH<100U<100U<100U Nitrogen,nitrite,asNNAug/l1000<100U<100U<100UH<100UH<100U<100U<100U<100U<100U<100UH<100U<100U<100U<100U<100U<100UH<100U<100U<100U Solids,totaldissolvedNAug/l6180006720006340006290007170005470005930007570007850007870008580008350007710006900006960007260007400007090001770000 Sulfate,asSO4NAug/l10600069800740007310020200011600097900247000257000269000251000213000169000196002250074600264001370012400 Metals AluminumDissolvedug/l<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U AntimonyDissolvedug/l6<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<1.0U<15.0U<15.0U<15.0U<15.0U<15.0U<1.0U<15.0U<15.0U<15.0U<15.0U<15.0U<1.0U ArsenicDissolvedug/l 10 <10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<1.0U<10.0U<10.0U<10.0U<10.0U<10.0U<1.0U 12.2 <10.0U<10.0U 15.216.6 1.6 BariumDissolvedug/l200084.983.578.280.510612394.7426240100795590386538549504527518483 BerylliumDissolvedug/l4<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U BoronDissolvedug/l2730361025402560232016202740<100U<100U<100U<100U<100U<100U<100U<100U<100U<100U<100U<100U CadmiumDissolvedug/l5<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<0.50U<5.0U<5.0U<5.0U<5.0U<5.0U<0.50U<5.0U<5.0U<5.0U<5.0U<5.0U<0.50U ChromiumDissolvedug/l100<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U Chromium,hexavalentDissolvedug/l100(14)<10U<10U<10U<10U<10U<10U<10UJ-<10UJ-<10U<10U<10U<10U<10U<10U<10U<10U<10U<10U<10U CobaltDissolvedug/l6<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U CopperDissolvedug/l1300TT(12)<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U IronDissolvedug/l134<50.0U62.4J195J15303750<50.0U572J<50.0U130145838091.4300<50.0U<50.0U2602000119 LeadDissolvedug/l15TT(12)15<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U LithiumDissolvedug/l40<10.0U<50.0U<20.0U<20.0U14.311.013.417.6<50.0U<20.0U21.218.216.8<10.0U<50.0U<20.0U10.911.310.8 MagnesiumDissolvedug/l17100179001700016800191001500016100330003280031200342003460034100379003710033200379003720036100 ManganeseDissolvedug/l6390725069906900776054905110408045904340458055405740234026102740263025202210 MercuryDissolvedug/l2<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20UJ-<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U MolybdenumDissolvedug/l100<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U NickelDissolvedug/l<5.0U<5.0U7.27.0<5.0U<5.0U6.1<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U SeleniumDissolvedug/l50<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U SilverDissolvedug/l<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U SodiumDissolvedug/l52800686006400065600476003500058100105001150011700110001380014100773008230089300783007200076400 ThalliumDissolvedug/l2<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<1.0U<20.0U<20.0U<20.0U<20.0U<20.0U<1.0U<20.0U<20.0U<20.0U<20.0U<20.0U<1.0U ZincDissolvedug/l<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U AluminumTotalug/l<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U79.6153<75.0U<75.0U162<75.0U<75.0U167<75.0U52298.2<75.0U AntimonyTotalug/l6<15.0U<15.0U<15.0U<15.0U<15.0U<1.0U<1.0U<15.0U<15.0U<15.0U<15.0U<1.0U<1.0U<15.0U<15.0U<15.0U<15.0U<1.0U<1.0U

BoronTotalug/l2700375025302530212016002720<100U<100U<100U<100U<100U<100U<100U<100U<100U<100U<100U<100U CadmiumTotalug/l5<5.0U<5.0U<5.0U<5.0U<5.0U<0.50U<0.50U<5.0U<5.0U<5.0U<5.0U<0.50U<0.50U<5.0U<5.0U<5.0U<5.0U<0.50U<0.50U CalciumTotalug/l124000147000139000139000139000108000169000194000187000177000180000147000163000156000147000142000 ChromiumTotalug/l100<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U Chromium,hexavalentTotalug/l100(14)<10U<10U<10U<10U<10U<10U<10UJ-<10UJ<10U<10U<10U<10U<10U<10U<10U<10U<10U<10U<10U CobaltTotalug/l6<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U CopperTotalug/l1300TT(12)<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U IronTotalug/l58109000145001430097405110407014500158002340015700138001340016700166009770171001520015900 LeadTotalug/l15TT(12)15<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U LithiumTotalug/l40<10.0U<50.0U<20.0U<20.0U10.311.514.218.3<50.0U<20.0U17.419.817.2<10.0U<50.0U<20.0U<10.0U10.710.8 MagnesiumTotalug/l17300186001870018700180001490015900328003280034600330003350035800381003700038000364003490037100 ManganeseTotalug/l6720767074307420731053405250430047004660446054905930254027403030262024602420 MercuryTotalug/l2<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20UJ-<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U MolybdenumTotalug/l100<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U NickelTotalug/l5.15.47.08.1<5.0U<5.0U5.7<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U SeleniumTotalug/l50<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U SilverTotalug/l<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U SodiumTotalug/l52300707006850068900467003450060500100001140012400111001350014800725008060094400783006790076400 ThalliumTotalug/l2<20.0U<20.0U<20.0U<20.0U<20.0U<1.0U<1.0U<20.0U<20.0U<20.0U<20.0U<1.0U<1.0U<20.0U<20.0U<20.0U<20.0U<1.0U<1.0U ZincTotalug/l<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U

Table 3
MW-1MW-1MW-1MW-1MW-1MW-2MW-2MW-2MW-2MW-2MW-2MW-3MW-3MW-3MW-3MW-3MW-3 9/15/202111/09/20216/24/20229/21/202211/15/20229/15/202111/09/20213/21/20226/24/20229/21/202211/15/20229/15/202111/09/20213/21/20226/24/20229/21/202211/15/2022 NNNFDNNNNNNNNNNNNNNN Parameter Totalor DissolvedUnits EPAMaximum ContaminantLevels 40CFR257.95(h)(2) Groundwater ProtectionStandards EffectiveDate 03/01/201804/01/2012
Underline
1015.420.224.222.711.9 8.77.6<10.0U<10.0U<10.0U<10.0U6.17.4 48.838.323.841.141.536 BariumTotalug/l2000126138170170151155121494691168961773556812831664784794781 BerylliumTotalug/l4<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U
MW-1 3/21/2022 SampleType Location Date Page 1 of 3 1/20/2023 \\barr.com\projects\Jeff City\25 MO\49\25491019 Groundwater Monitoring Program\WorkFiles\2022\2022 Federal GW Technical Memorandum\Tables\Table 3 - Groundwater Analytical Summary_01192023v2.xlsx
ArsenicTotalug/l

2021-2022 Groundwater Analytical Summary

GeneralParameters

Carbon,totalorganicNAug/l70006900470058005100660014001500210020001300160015001500160014006100<25000U5900 ChemicalOxygenDemandNAug/l1850023700<10000U219001680017400<10000U<10000U<10000U10600<10000U<10000U<10000U<10000U<10000U<10000U300002930036000 ChlorideNAug/l24002500240022002000230020100223004370041300326004050041900503004540073100964007320073000 FluorideNAug/l4000280260220<200U<200U<200U250260<200U<200U<200U220220<200U<200U230280<200U<200U Hardness,asCaCO3NAug/l253000285000274000253000226000254000244000243000276000298000263000287000293000266000257000276000187000177000250000 Nitrogen,nitrate+nitrite,asNNAug/l10000<100U<100U<100U<100U<100U<100U<100U<100U<100UJ+<100UJ+<100U190150<100U<100U<100U<100U<100U140 Nitrogen,nitrate,asNNAug/l10000<100U<100U<100U<100U<100U<100U<100U<100U<100U<100U<100U190150<100U<100U<100U<100U<100U140 Nitrogen,nitrite,asNNAug/l1000<100U<100U<100U100<100U<100U<100U<100U<100U<100U<100U<100U<100U<100U<100U<100U<100U<100U<100U Solids,totaldissolvedNAug/l461000485000463000465000443000<10000U368000371000381000387000778000412000436000432000J180000J4180001010000872000932000 Sulfate,asSO4NAug/l170044003400<1000U<1000U<1000U12100109004800480031002300230017001800<1000U182004250036500 Metals AluminumDissolvedug/l<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U89.6<75.0U<75.0U

BariumDissolvedug/l2000265292286270275223170187248228219220225251249286217169319 BerylliumDissolvedug/l4<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U BoronDissolvedug/l141147136114114122<100U<100U<100U<100U<100U<100U<100U<100U<100U<100U239013601860 CadmiumDissolvedug/l5<5.0U<5.0U<5.0U<5.0U<5.0U<0.50U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<0.50U<5.0U<5.0U<5.0U ChromiumDissolvedug/l100<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U Chromium,hexavalentDissolvedug/l100(14)<10U<10U<10U<10H <10J- <10U<10U<10UH<10UH<10U<10UH<10U<10H <10J<10H <10J- <10UJ-<10U<10U<10UH<10U<10U CobaltDissolvedug/l6<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U CopperDissolvedug/l1300TT(12)<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U13.6<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U IronDissolvedug/l92.4<50.0U<50.0U56806100<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U557432<50.0U28753.7<50.0U LeadDissolvedug/l15TT(12)15<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U LithiumDissolvedug/l4020.017.416.517.021.616.5<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U11.047.618.2 MagnesiumDissolvedug/l17400181001770015100148001610016600172001890019000179001810017900178001760021300178001390019900 ManganeseDissolvedug/l102012101220759665102042679915201160131010601170163016101920540127434 MercuryDissolvedug/l2<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U MolybdenumDissolvedug/l100<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U NickelDissolvedug/l<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U SeleniumDissolvedug/l50<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U SilverDissolvedug/l<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U SodiumDissolvedug/l69400729007340059400588006610044000440004780047600458004440043900439004400050800338000269000334000 ThalliumDissolvedug/l2<20.0U<20.0U<20.0U<20.0U<20.0U<1.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<1.0U<20.0U<20.0U<20.0U ZincDissolvedug/l<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U AluminumTotalug/l131485<75.0U23719213585.576.22210J3570J<75.0U75972047545726109051680601 AntimonyTotalug/l6<15.0U<15.0U<15.0U<15.0U<1.0U<1.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<1.0U<1.0U<1.0U<15.0U<15.0U<15.0U

BariumTotalug/l2000531590428570522516178184256J287J221246249248245270178222404 BerylliumTotalug/l4<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U BoronTotalug/l126144125114108129<100U<100U<100U<100U<100U<100U<100U<100U<100U<100U134015202090 CadmiumTotalug/l5<5.0U<5.0U<5.0U<5.0U<0.50U<0.50U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<0.50U<0.50U<0.50U<5.0U<5.0U<5.0U CalciumTotalug/l7350083400772007460067300705007010079300860007460083600855007740075000507004610066000 ChromiumTotalug/l100<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U5.9<5.0U<5.0U<5.0U<5.0U<5.0U5.4<5.0U<5.0U<5.0U Chromium,hexavalentTotalug/l100(14)<10U<10U<10U<10H <10J- <10U<10U<10U<10U<10U<10UH<10U<10H <10J<10H <10J- <10UJ-<10U<10U<10UH<10U<10U CobaltTotalug/l6<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U CopperTotalug/l1300TT(12)<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U23.8<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U11.0<10.0U IronTotalug/l2260024700131002180020700221001582622570J4090J46312901280143015503510276055006660 LeadTotalug/l15TT(12)15<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U LithiumTotalug/l4019.018.115.920.020.818.3<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U58.537.816.4 MagnesiumTotalug/l16900186001960016200140001680016600165001880020200187001890019400177001700018500147001500020600 ManganeseTotalug/l1140138013308076831180756126018101900115011801180156015101620336506752 MercuryTotalug/l2<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U MolybdenumTotalug/l100<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U NickelTotalug/l<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U7.0<5.0U SeleniumTotalug/l50<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U SilverTotalug/l<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U SodiumTotalug/l64000737007690061400562006750043600409004460046800505004510046200429004200044400298000272000368000 ThalliumTotalug/l2<20.0U<20.0U<20.0U<20.0U<1.0U<1.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<1.0U<1.0U<1.0U<20.0U<20.0U<20.0U ZincTotalug/l<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U

Table 3
MW-4MW-4MW-4MW-4MW-4MW-4MW-5MW-5MW-6MW-6MW-6 9/15/202111/09/20213/21/20226/23/20229/21/202211/15/20223/22/202211/15/20229/14/202111/10/20213/22/2022 NNNNNNNFDNFDNNFDNFDNNNN Parameter Totalor DissolvedUnits EPAMaximum ContaminantLevels EPAMaximum ContaminantLevels 40CFR257.95(h)(2) EffectiveDate 03/01/201804/01/2012
ExceedanceKeyBold Underline
AntimonyDissolvedug/l6<15.0U<15.0U<15.0U<15.0U<15.0U<1.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<1.0U<15.0U<15.0U<15.0U ArsenicDissolvedug/l 1010.8 <10.0U<10.0U 11.910.8 1.9<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<1.0U<10.0U<10.0U<10.0U
ArsenicTotalug/l 1047.442.124.126.826.442.5 <10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U1.11.01.3<10.0U<10.0U<10.0U
SampleType 9/21/2022 MW-5 6/23/2022 MW-5 11/10/2021 MW-5 9/14/2021 LocationMW-5 Date Page 2 of 3 1/20/2023 \\barr.com\projects\Jeff City\25 MO\49\25491019 Groundwater Monitoring Program\WorkFiles\2022\2022 Federal GW Technical Memorandum\Tables\Table 3 - Groundwater Analytical Summary_01192023v2.xlsx

ExceedanceKeyBold Underline

GeneralParameters

Carbon,totalorganicNAug/l15700560016300540011000460032002300183001240011500121003900250010100J17600J

ChemicalOxygenDemandNAug/l45300353003470069300142001590014900<10000U29500357004030024500248001340026500J14000J

ChlorideNAug/l577006560076400264002860031200348002860031700572006320073900124000112000132000136000 FluorideNAug/l4000<200U<200U290860650110076025087011007001000880<200U720750 Hardness,asCaCO3NAug/l122000173000195000978055600643006040054400710007620008160008030008370092900121000132000 Nitrogen,nitrate+nitrite,asNNAug/l10000<100U<100U<100U<100U<100UH<100UH<100U<100U<100U<100U<100U<100U<100U<100U<100U<100U Nitrogen,nitrate,asNNAug/l10000<100U<100U<100U<100U<100U<100UH<100U<100U<100U<100U<100U<100U<100U<100U<100U<100U Nitrogen,nitrite,asNNAug/l1000<100U<100U<100U<100U<100UH<100UH<100U<100U<100U<100U<100U<100U120<100U<100U<100U Solids,totaldissolvedNAug/l718000H861000860000525000639000646000631000H61100060200014500001090000930000892000H633000649000645000 Sulfate,asSO4NAug/l59000607006260029200397004740044600<1000U1540025500279003410011500510062006300

Metals

AluminumDissolvedug/l<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U<75.0U8546444268120136132102

BerylliumDissolvedug/l4<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U BoronDissolvedug/l784991948102016001510137015001440511481456986915950926 CadmiumDissolvedug/l5<5.0U<5.0U<0.50U<5.0U<5.0U<5.0U<5.0U<5.0U<0.50U<5.0U<5.0U<5.0U<5.0U<5.0U<0.50U<0.50U ChromiumDissolvedug/l100<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U16.917.815.7<5.0U<5.0U<5.0U Chromium,hexavalentDissolvedug/l100(14)<10H <10J- <10U<10U<10U<10UHJ<10U<10H<10J-H <10U<10U<10UH<10U<10UJ-<10H <10J- <10U<10U<10U CobaltDissolvedug/l6<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U CopperDissolvedug/l1300TT(12)<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U10.711.5<10.0U12.4<10.0U<10.0U<10.0U IronDissolvedug/l<50.0U22670.9<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U56.5<50.0U<50.0U903051.9<50.0U<50.0U LeadDissolvedug/l15TT(12)15<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U LithiumDissolvedug/l4060.048.240.830031.633.111147.143.547855842110411710690.2 MagnesiumDissolvedug/l9190137001430019443404900392041204280<50.0U<50.0U<50.0U2010187232279 ManganeseDissolvedug/l169342295<5.0U<5.0U<5.0U39.442.9<5.0U<5.0U<5.0U<5.0U125<5.0U<5.0U<5.0U MercuryDissolvedug/l2<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U MolybdenumDissolvedug/l100<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U24.125.024.6<20.0U<20.0U<20.0U<20.0U NickelDissolvedug/l<5.0U<5.0U<5.0U8.5<5.0U<5.0U<5.0U<5.0U<5.0U15.113.514.316.68.6<5.0U<5.0U SeleniumDissolvedug/l50<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U SilverDissolvedug/l<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U SodiumDissolvedug/l208000249000261000174000252000248000219000220000219000117000115000106000257000261000289000282000 ThalliumDissolvedug/l2<20.0U<20.0U<1.0U<20.0U<20.0U<20.0U<20.0U<20.0U<1.0U<20.0U<20.0U<20.0U<20.0U<20.0U<1.0U<1.0U ZincDissolvedug/l<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U AluminumTotalug/l505107<75.0U12677.715022514929110701500858878092916301930

BoronTotalug/l812964966986158014501420150015204484934601060862863948

CadmiumTotalug/l5<5.0U<0.50U<0.50U<5.0U<5.0U<5.0U<5.0U<0.50U<0.50U<5.0U<5.0U<5.0U<5.0U<0.50U0.51J<0.50UJ CalciumTotalug/l31800476003130151001670017000150003050003260003210002980036500 ChromiumTotalug/l100<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U15.018.422.816.38.36.76.1

Chromium,hexavalentTotalug/l100(14)<10H <10J- <10U<10U<10U<10UHJ-<10U<10H<10J-H <10U<10U31H<10U<10U<10H <10J- <10U<10U<10U

CobaltTotalug/l6<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U5.4<5.0U<5.0U<5.0U<5.0U

CopperTotalug/l1300TT(12)<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U10.814.213.913.5<10.0U<10.0U<10.0U

IronTotalug/l120013002430217100500309321536242843479951091918602200

LeadTotalug/l15TT(12)15<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U<10.0U

LithiumTotalug/l4065.547.041.833231.233.410545.445.2426361408112123117109

MagnesiumTotalug/l1030013200146004774330547043904120473072.22521722260392630764

ManganeseTotalug/l18334136310.630.297.357.357.387.5<5.0U15.614.512912.334.137.2

MercuryTotalug/l2<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U<0.20U MolybdenumTotalug/l100<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U<20.0U22.022.624.8<20.0U<20.0U<20.0U<20.0U NickelTotalug/l<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U<5.0U13.313.716.317.79.511.28.8 SeleniumTotalug/l50<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U<15.0U SilverTotalug/l<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U<7.0U SodiumTotalug/l225000241000263000170000248000260000232000218000232000105000107000114000283000245000242000279000 ThalliumTotalug/l2<20.0U<1.0U<1.0U<20.0U<20.0U<20.0U<20.0U<1.0U<1.0U<20.0U<20.0U<20.0U<20.0U<1.0U<1.0U<1.0U ZincTotalug/l<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U<50.0U

3
Table
MW-6MW-6MW-6MW-7MW-7MW-7MW-7MW-7MW-7MW-8MW-8MW-8MW-8MW-8 6/23/20229/21/202211/15/20229/15/202111/09/20213/21/20226/23/20229/21/202211/15/20229/14/202111/10/20213/22/20226/23/20229/21/2022 NNNNNNNNNNNNNNNFD Parameter Totalor DissolvedUnits EPAMaximum ContaminantLevels EPAMaximum ContaminantLevels 40CFR257.95(h)(2) EffectiveDate 03/01/201804/01/2012
2021-2022 Groundwater Analytical Summary
AntimonyDissolvedug/l 6 <15.0U<15.0U<1.0U<15.0U<15.0U<15.0U<15.0U<15.0U<1.0U<15.0U<15.0U<15.0U 26.3 <15.0U2.8J1.8J ArsenicDissolvedug/l 10 <10.0U<10.0U<1.0U 12.3 <10.0U<10.0U<10.0U<10.0U1.4 10.8 <10.0U<10.0U<10.0U<10.0U1.41.2 BariumDissolvedug/l200015233338617.845.853.957.889.192.260059655411812.511.311.4
AntimonyTotalug/l 6 <15.0U1.3<1.0U<15.0U<15.0U<15.0U<15.0U5.1<1.0U<15.0U<15.0U<15.0U 27.6 1.24.44
BariumTotalug/l200016033642421.653.058.170.598.6115545587550130105108113 BerylliumTotalug/l4<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U<1.0U
ArsenicTotalug/l10<10.0U1.82.1<10.0U<10.0U<10.0U<10.0U1.51.6<10.0U<10.0U<10.0U<10.0U1.31.81.8
SampleType MW-8 11/15/2022 Location Date Page 3 of 3 1/20/2023 \\barr.com\projects\Jeff City\25 MO\49\25491019 Groundwater Monitoring Program\WorkFiles\2022\2022 Federal GW Technical Memorandum\Tables\Table 3 - Groundwater Analytical Summary_01192023v2.xlsx

NSampleType:Normal

FDSampleType:FieldDuplicate

Data Footnotes and Qualifiers

Barr Standard Footnotes and Qualifiers

HRecommendedsamplepreservation,extractionoranalysisholdingtimewasexceeded.

JEstimateddetectedvalue.EithercertainQCcriteriawerenotmetortheconcentrationisbetweenthelaboratory'sdetectionand quantitationlimits.

J+Theresultisanestimatedquantityandmaybebiasedhigh.

J-Theresultisanestimatedquantityandmaybebiasedlow.

UTheanalytewasanalyzedfor,butwasnotdetected.

UHTheanalytewasanalyzedfor,butwasnotdetected.Therecommendedsamplepreservation,extractionoranalysisholdingtimewas exceeded.

UJTheanalytewasanalzyedfor,butwasnotdetected.Thereportedvalueisapproximateandmaybeinaccurateorimprecise.

(19)Atnotimecanturbiditygoabove5NTU.

(14)Basedonthecriteriaforchromium,total.

TT(12)Treatmenttechnique;Copperactionlevel1.3mg/l;leadactionlevel0.015mg/l.

Maximum Contaminant Levels Page 1 of 1 1/20/2023 \\barr.com\projects\Jeff City\25 MO\49\25491019 Groundwater Monitoring Program\WorkFiles\2022\2022 Federal GW Technical Memorandum\Tables\Table 3 - Groundwater Analytical Summary_01192023v2.xlsx
EPA

Hydrographs

C
Attachment
746 746 747 747 748 748 749 749 750 750 751 751 Groundwater Elevation (ft-msl) Date
MW-1 GROUNDWATER ELEVATION HYDROGRAPH
748 749 749 749 749 749 750 750 750 750 Groundwater Elevation (ft-msl)
Date
MW-2 GROUNDWATER ELEVATION HYDROGRAPH
743 743 744 744 745 745 746 746 747 747 Groundwater Elevation (ft-msl) Date
MW-3 GROUNDWATER ELEVATION HYDROGRAPH
744 744 745 745 746 746 747 747 748 748 Groundwater Elevation (ft-msl) Date
MW-4 GROUNDWATER ELEVATION HYDROGRAPH

MW-5 GROUNDWATER ELEVATION HYDROGRAPH

746 747 748 749 750 751 752 Groundwater Elevation (ft-msl)
Date

MW-6 GROUNDWATER ELEVATION HYDROGRAPH

749 750 751 752 753 754 755 Groundwater Elevation (ft-msl)
Date

MW-7 GROUNDWATER ELEVATION HYDROGRAPH

730 735 740 745 750 755 760 765 Groundwater Elevation (ft-msl)
Date

MW-8 GROUNDWATER ELEVATION HYDROGRAPH

748 750 752 754 756 758 760 762 764 Groundwater Elevation (ft-msl)
Date

Field Data

Attachment D
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