HRS DOCUMENTATION RECORD COVER SHEET 

Name of Site: Compass Plaza Well TCE 

EPA ID No.: MON000706143 

Contact Persons 

EPA Contact: Michelle Quick 

U.S. Environmental Protection Agency, Region 7 

901 North 5th Street 

Kansas City, Kansas 66101 

(913) 551-7335 

Site Investigation: Pia Capell and Michael Stroh, Missouri Department of Natural Resources 

(MDNR) Hazardous Waste Program, Site Assessment Unit 

Documentation Record: David Zimmermann, Tetra Tech START 

Pathways, Components, or Threats Not Scored 

The surface water migration, soil exposure, and air migration pathways were not scored in this Hazard 

Ranking System (HRS) evaluation. No releases or impacts to surface water and/or air migration pathway 

were identified by previous investigations. These migration pathways do not contribute significantly to 

the overall site score. The soil exposure pathway was not evaluated because no significant areas of soil 

contamination were documented in the top two feet of soil and no contamination was documented on the 

property of a residence and within 200 feet of the residence. Therefore, this exposure pathway would not 

be expected to contribute to the overall site score. 
HRS DOCUMENTATION RECORD

Name of Site: Compass Plaza Well TCE 

EPA Region: 7 

Date Prepared: September 2011 

Street Address of Site*: 201 South Marshall Street 

City, County, State, Zip Code: Rogersville, Greene County, Missouri 65742 

General Location in the State: The City of Rogersville is located in southwest Missouri, 8.4 miles east 

of Springfield, Missouri on U.S. Highway 60. 

Topographic Map: United States Geological Survey. Rogersville, Missouri quadrangle: 

7.5-Minute Series Topographic Map, N3700-W9300/7.5. 1970. 

Latitude: 37.109009° North 

Longitude: 93.083168° West 

The latitude and longitude listed above specify the approximate center of the ground water plume 

associated with Compass Plaza Well TCE. Google Earth (www.google.com/earth/index.html ) was used 

to obtain the coordinates (Ref. 21). Figure 1 shows the location of Compass Plaza Well TCE. 

 Scores

 Ground Water Migration Pathway 100 

 Surface Water Migration Pathway Not scored 

 Soil Exposure Pathway Not scored 

 Air Migration Pathway Not scored 

 HRS SITE SCORE 50.00 

*The street address, coordinates, and contaminant locations presented in this HRS documentation record identify the 

general area the site is located. They represent one or more locations EPA considers part of the site based on the 

screening information EPA used to evaluate the site for NPL listing. EPA lists national priorities among the known 

“releases or threatened releases” of hazardous substances; thus, the focus is on the release, not precisely delineated 

boundaries. A site is defined as where a hazardous substance has been “deposited, stored, placed, or otherwise come 

to be located.” Generally, HRS scoring and the subsequent listing of a release merely represent the initial 

determination that a certain area may need to be addressed under CERCLA. Accordingly, EPA contemplates that 

the preliminary description of facility boundaries at the time of scoring will be refined as more information is 

developed as to where contamination has come to be located. 

September 2011 1 
September 2011 2 
HRS SITE SCORE 

WORKSHEET FOR COMPUTING HRS SITE SCORE 

S S2

1. Ground Water Migration Pathway Score (Sgw) 

(from Table 3-1, line 13) 

100 10,000 

2a. Surface Water Overland/Flood Migration Component 

(from Table 4-1, line 30) 

NS NA 

2b. Ground Water to Surface Water Migration Component 

 (from Table 4-25, line 28) 

NS NA 

2c. Surface Water Migration Pathway Score (Ssw) 

Enter the larger of lines 2a and 2b as the pathway score. 

NS NA 

3. Soil Exposure Pathway Score (Ss) 

(from Table 5-1, line 22) 

NS NA 

4. Air Migration Pathway Score (Sa) 

(from Table 6-1, line 12) 

NS NA 

5. Total of Sgw

2

 + Ssw2 + Ss

2

 + Sa

2 100 10,000 

6. HRS Site Score Divide the value on line 5 

by 4 and take the square root 

50.00 

Notes: 

NS Not Scored 

NA Not Applicable 

September 2011 3 
September 2011 4 

HRS TABLE 3-1 — GROUND WATER MIGRATION PATHWAY SCORESHEET 

COMPASS PLAZA WELL TCE 

Factor Categories and Factors Maximum Value Value Assigned 

Likelihood of Release to an Aquifer: 

1. Observed Release: 550 550 

2. Potential to Release: 

 2a. Containment 10 NS 

 2b. Net Precipitation 10 NS 

 2c. Depth to Aquifer 5 NS 

 2d. Travel Time 35 NS 

 2e. Potential to Release [lines 2a x (2b + 2c + 2d)] 500 NS 

3. Likelihood of Release (higher of lines 1 and 2e) 550 550

Waste Characteristics:

4. Toxicity/Mobility a 10,000 

5. Hazardous Waste Quantity a 100 

6. Waste Characteristics 100 32

Targets:

7. Nearest Well 50 50 

8. Population: 

 8a. Level I Concentrations b 580 

 8b. Level II Concentrations b 0 

 8c. Potential Contamination b 101 

 8d. Population (lines 8a + 8b + 8c) b 681 

9. Resources 5 0 

10. Wellhead Protection Area 20 5 

11. Targets (lines 7 + 8d + 9 + 10) b 736

GROUND WATER MIGRATION SOURCE FOR AN AQUIFER

12. Aquifer Source [(lines 3 x 6 x 11)/82,500]c 100 100 

GROUND WATER MIGRATION PATHWAY SCORE

13. Pathway Score (Sgw), (highest value from line 12 for all 

aquifers evaluated)c

100 100 

a

Maximum value applies to waste characteristics category. 

b

Maximum value not applicable. 

c

Do not round to nearest integer. 

NS Not Scored 
REFERENCES 

Reference 

Number Description of the Reference 

1 

U.S. Environmental Protection Agency (EPA). Hazard Ranking System, 40 CFR Part 300, 

Appendix A, 55 FR 51533. December 14, 1990. Entire rule can be found on the World 

Wide Web at http://www.epa.gov/superfund/sites/npl/hrsres/#HRS%20Rule Excerpt. 1 

page. 

2 

EPA. Superfund Chemical Data Matrix. Interim revised values for trichloroethene (TCE), 

Appendix A, BI and BII and Table BI for other compounds. Accessed online at: 

http://www.epa.gov/superfund/sites/npl/hrsres/tools/scdm.htm Revised October 23, 2006 

(for TCE), other compounds January 27, 2004. Excerpt. 14 pages. 

3 

United States Geological Survey. Rogersville, Missouri quadrangle: 7.5-Minute Series 

Topographic Map, N3700-W9300/7.5. 1970. Location of the center of the ground water 

plume added by Tetra Tech. 1 sheet. 

4 

Capell, Pia and Michael Stroh. Missouri Department of Natural Resources. Site 

Inspection/Removal Site Evaluation Report for the Compass Plaza TCE Well Site, Greene 

County, Missouri. EPA ID Number MON000706143. February 1, 2011. 1,570 pages. 

5 

Capell, Pia. Missouri Department of Natural Resources. Abbreviated Preliminary 

Assessment Checklist for the Compass Plaza TCE Well Site, Greene and Webster 

Counties, Missouri. EPA ID Number MON000706143. March 25, 2010. 6 pages. 

6 

Jacobs Engineering Group, Draft Site Inspection Prioritization Positronics Industries site. 

EPA contract number; 68-W8-0122, work assignment number 53-7WZZ. January 1994. 

67 pages. 

7 

EPA. Envirofacts Warehouse-CERCLIS Query. On-line address: 

http://iaspub.epa.gov/enviro/cerclis_web.report?pgm_sys_id=MOD007447196. Accessed 

March 29, 2011. 2 pages. 

8 

Bachle, Peter. Geological Survey Program, Division of Geology and Land Survey. 

Memorandum- Geohydrologic Summary of Compass Plaza Well Site. April 15, 2010. 

30 Pages. 

9 Hughes, Harold E. U.S. Department of Agriculture, Soil Conservation Service. Soil 

Survey Of Greene and Lawrence Counties, Missouri. March 1982. Five excerpted pages. 

10 

Web Soil Survey Map for Compass Plaza TCE Well site. From U.S. Department of 

Agriculture, Natural Resource Conservation Service online mapping tool found at: 

http://websoilsurvey.nrcs.usda.gov/app/WebSoilSurvey.aspx . Map created 

January 13, 2011. Three pages. 

11 

Miller, Don E. and James E. Vandike. Missouri Department of Natural Resources’ 

Division of Geology and Land Survey. Missouri State Water Plan Series Volume II 

Groundwater Resources of Missouri. Water Resources Report Number 46. 1997. 

24 excerpted pages. 

12 

State of Missouri Division of Geological Survey and Water Resources. Well Log for City 

of Rogersville Well Number 2, Log No. 27997. Logged in September 1976. Well log 

obtained on-line from: http://www.dnr.mo.gov/env/wrc/logmain/greene.pdf Four pages. 

13 

Tetra Tech EM, Inc. (Tetra Tech). Quality Assurance Project Plan for Removal Action at 

the Compass Plaza TCE site. Contract No. EP-S7-06-01, Task Order No. 0194. 

August 13, 2010. 17 pages. 

September 2011 5 
Reference 

Number Description of the Reference 

14 

Scroggin, Tom (TS), Tetra Tech START, and Doug Ferguson, EPA Region 7 Superfund 

Emergency Response and Removal (SUPR/ER&R). Chain of Custody Forms, Field Sheets 

and Logbook for Compass Plaza Well TCE Removal Action Support. For Analytical 

Services Request (ASR) number 5049 for sampling event from August 16 - 25, 2010. 31 

pages. 

15 

Davis, Michael F., Chief, Chemical Analysis and Response Branch, Environmental 

Services Division, U.S. Environmental Protection Agency Region 7 to Doug Ferguson, 

EPA Region 7 Superfund Emergency Response and Removal (SUPR/ER&R). Transmittal 

of Sample Analysis Results for ASR #5049 for the Compass Plaza Well TCE sampling. 

September 16, 2010. 18 pages. 

16 EPA Region 7. HRS Analysis Results Supplement for ASR #5049 for the Compass Plaza 

Well TCE sampling. January 7, 2011. 34 pages. 

17 

Ellis, Harry V. III, PhD, Tetra Tech, to Tetra Tech Project file. Review and Validation of 

the Missouri Department of Natural Resources (MDNR) Data and Sample Quantitation 

Limit. Memorandum. February 14, 2011. 24 pages. 

18 

Sims, Judith L. and others. Superfund Technology Support Center for Ground Water. 

Reductive Dehalogenation of Organic Contaminants in Soils and Groundwater. Office of 

Solid Waste and Emergency Response. EPA/540/4-90/054. January 1991. 12 pages.

19 

Ferguson, Doug, EPA Region 7 Superfund Emergency Response and Removal 

(SUPR/ER&R). Chain of Custody Forms and Field Sheets for Compass Plaza Well TCE 

Removal Action Support. For Analytical Services Request (ASR) number 5255 for 

sampling event from February 22 - 24, 2011. 37 pages. 

20 

Missouri Department of Natural Resources. Source Water Assessment Plan Maps and well 

information for the Rogersville PWSS No. 5010699. Prepared by the Center for Applied 

Research and Environmental Systems, University of Missouri. Map update May 14, 2010. 

4 pages. 

21 

Zimmermann, David, Tetra Tech Project Manager. Project Note Regarding the Latitude 

and Longitude for the Compass Plaza TCE Well site (CERCLIS ID Number: 

MON000706143). July 25, 2011. 1 page. 

22 

Missouri Department of Natural Resources, Public Drinking Water Program. Drinking 

Water Source Water Assessment Plan. Plan accessed online at 

http://drinkingwater.missouri.edu/swap/ on May 19, 2011. 2 pages (excerpt). 

23 

Missouri Department of Natural Resources, Division of Geology and Land Survey. High 

Yield and Public Well Record and Pump Information Data form for well with reference 

number of 00331792. February 18, 2004. 1 page. 

24 

Missouri Department of Natural Resources, Division of Geology and Land Survey. Water 

Well Certification and Pump Information Record form for well with reference number of 

279327. October 12, 2001. 1 page. 

25 

Missouri Department of Natural Resources, Division of Geology and Land Survey. 

Domestic/Multifamily Well Record and Pump Information Data form for well with 

reference number of 00421957 identified as the Jamestown Irrigation well. 

August 25, 2009. 1 page. 

26 

Missouri Department of Natural Resources. Source Water Assessment Plan Maps and well 

information for Bill’s Quick Mart Well #1 PWSS No. 5258130. Prepared by the Center for 

Applied Research and Environmental Systems, University of Missouri. Map update 

April 7, 2011. 3 pages. 

September 2011 6 
September 2011 7 

Reference 

Number Description of the Reference 

27 

Missouri Department of Natural Resources, Division of Geology and Land Survey 

(DNR DGLS). Missouri Sample Well-Log Library for well with Log Number of 025206. 

October 1967. 2 pages. 

28 

Missouri Department of Natural Resources, Division of Geology and Land Survey 

(DNR DGLS). Missouri Sample Well-Log Library for well with Log Number of 029048. 

April 22, 2004. 1 page. 

29 

Missouri Department of Natural Resources, Division of Geology and Land Survey 

(DNR DGLS). Missouri Sample Well-Log Library for well with Log Number of 014464. 

May 3, 1956. 2 pages. 

30 

Missouri Department of Natural Resources, Division of Geology and Land Survey. High 

Yield and Public Well Record and Pump Information Data form for well with reference 

number of 00251660. July 3, 2000. 1 page. 

31 

Scroggin, Tom. Tetra Tech START Project Manager. Project Memorandum Regarding the 

Records Search for the Compass Plaza TCE Well site (CERCLIS ID Number: 

MON000706143). July 18, 2011. 1 page. 

32 

U.S. Census Bureau. American FactFinder. Rogersville City, Missouri, Table QT-P11, 

Households and Families: 2010, 2010 Census Summary File 1. Accessed on line at: 

http://factfinder2.census.gov/faces/tableservices/jsf/pages/productview.xhtml?pid=DEC_10

_SF1_QTP11&prodType=table. Accessed August 12, 2011. 2 pages. 

33 

Logan-Rogersville R-VIII School District. Buildings in our District. Document accessed 

online at: http://www.logrog.net/MiscPaperWork/BuildingsINourDISTRICT.htm. 

Accessed July 15, 2011. 1 page. 

34 

Tetra Tech EM, Inc. (Tetra Tech). Addendum #1 to the Quality Assurance Project Plan for 

Removal Support at the Compass Plaza TCE site. Contract No. EP-S7-06-01, Task Order 

No. 0194. February 24, 2011. 18 pages. 

35 

Scroggin, Tom (TS), Tetra Tech START, and Doug Ferguson, EPA Region 7 Superfund 

Emergency Response and Removal (SUPR/ER&R). Chain of Custody Forms and Field 

Sheets for Compass Plaza Well TCE Removal Support. For Analytical Services Request 

(ASR) number 5367 for sampling event from May 10 – 12, 2011. 79 pages. 

36 

Davis, Michael F., Chief, Chemical Analysis and Response Branch, Environmental 

Services Division, U.S. Environmental Protection Agency Region 7 to Doug Ferguson, 

Superfund Emergency Response and Removal North Branch (SUPR/ERNB). Transmittal 

of Sample Analysis Results for ASR #5367 for the Compass Plaza Well TCE sampling. 

June 10, 2011. 46 pages. 

37 

Missouri Department of Natural Resources, Division of Geology and Land Survey 

(DNR DGLS). Missouri Sample Well-Log Library for well with Log Number of 012589. 

March 1954. 2 pages. 

38 

State of Missouri Division of Geological Survey and Water Resources. Well Log for City 

of Rogersville Well Number 1, Log No. 12589. Logged in January 1954. Well log 

obtained on-line from: http://www.dnr.mo.gov/env/wrc/logmain/greene.pdf. 4 pages. 

39 EPA Region 7. Analysis Information: ASR 4907. May 10, 2010. 4 pages. 
SITE DESCRIPTION 

Compass Plaza Well TCE is located in southeastern Greene County near the Webster and Christian 

County borders. The approximate center of the ground water plume which encompasses the site is 

1.4 miles north of the border of Greene and Christian Counties and 1 mile west of the Greene and 

Webster County border (see Figure 1). The contaminated ground water plume is on the west side of 

Rogersville, Missouri. Rogersville is located in Greene and Webster counties. The site consists of 

contaminated ground water that has impacted domestic and irrigation wells. The primary contaminant of 

concern in ground water is trichloroethene (TCE) (Ref. 4, pp. 4, 5) although other chlorinated solvents 

have been reported in ground water samples in addition to TCE (Ref. 4, p. 8). The Compass Plaza Strip 

mall is located at 201 South Marshall Street on the western edge Rogersville, Missouri. An initial 

detection of TCE was found in the drinking water well that serves Compass Plaza on June 18, 2009 

(Ref. 5, p. 1). Consequently, additional sampling was conducted of eight public water wells in the area 

(Ref. 5, p. 1). Of these, two had detections of TCE: one which supplies the Citizen’s Bank of Rogersville 

and another that provides irrigation water (Ref. 5, p. 1). 

The Compass Plaza Well TCE site is a ground water plume in Greene County near Compass Plaza, a 

commercial area on the city of Rogersville’s western edge. Following routine public drinking water 

monitoring in June 2009, TCE was detected in the Compass Plaza strip mall well at levels below the EPA 

Maximum Contaminant Level (MCL) for drinking water. Two nearby wells were sampled and also 

showed the presence of TCE below the MCL. The site was referred by the MDNR’s Public Drinking 

Water Branch (PDWB) to the Hazardous Waste Program (HWP) in March 2010 for further assessment 

under CERCLA (Ref. 4, p. 4). 

The site was discovered and entered into CERCLIS on March 24, 2010 (Ref. 4, p. 4). An Abbreviated 

Preliminary Assessment (APA) was completed on March 25, 2010 (Ref. 5, p. 1). The site was 

recommended for further CERCLA assessment to identify the source of the TCE and further evaluate 

exposure (Ref. 5, p. 5). A site inspection/removal site evaluation (SI/RSE) was initiated by MDNR on 

April 1, 2010 and included multiple sampling events (Ref. 4, pp. 4, 5, 25, 26). By mid June, 2010, the 

State had sampled 121 wells and 13 contained TCE; six of these wells had TCE at concentrations 

exceeding the EPA MCL (Ref. 4, pp 1538, 1539). Also as part of the SI, the state conducted a search for 

possible sources of the ground water contamination and collected soil samples from suspect areas (Ref. 4, 

pp. 9 – 17). No source of the TCE in ground water was identified (Ref. 4, p. 17). A removal action was 

initiated by EPA on August 10, 2010, and is ongoing (Ref. 4, p. 4). The general objective of the removal 

action is to eliminate, through the provision of a permanent alternative water supply or whole-house 

filtration, human exposure of TCE and/or other hazardous substances present in ground water (Ref. 4, 

p. 1557). 

The site lies on the eastern border of the Springfield Plateau of the Ozark Plateau sub-province of the 

Interior Highlands physiographic province in Missouri. This area is characterized by rolling upland hills 

with low relief (Ref. 8, p. 1). Based on topographic maps, there are many sinkholes near the site. There 

are also 14 known springs near the site. Based upon this information and the limestone bedrock that 

underlies the site and comprises the uppermost aquifer, the site lies within a karst area (Refs. 4, p. 19; 8, 

p. 5). 

September 2011 8 Site Description 
After contamination was identified in ground water west of Rogersville, staff from the State of Missouri’s 

Southwest Regional Office (SWRO), the U.S. Environmental Protection Agency (EPA), and Missouri 

Department of Natural Resources (MDNR) Hazardous Waste Program (HWP) met on July 7, 2010 to 

review historical file information and potential source area locations reported to staff from various entities 

in the Rogersville area (citizens, public works employees, city office staff) (Ref. 4, p. 9). As shown on 

Figures 2 and 3 of the SI/RSE report, five potential areas for investigation were identified; two north of 

highway 60 (Compass Plaza Cleaners & Laundromat and Positronics Inc.), and three south of highway 60 

(a former woody debris burn pile area, a residential property at the location of a TCE-contaminated 

private well, and an industrial area east of Rogersville that is served by three private wells (Ref. 4, pp. 9, 

42, 43). A sampling event was conducted on July 27-28, 2010, and documented in a Site Inspection 

Sampling Report (Ref. 4, pp. 9, 1160). All samples during the investigation were analyzed for volatile 

organic compounds (VOC) (Ref. 4, p. 1165). During the MDNR SI/RSE soil samples were collected 

from the former Compass Cleaners & Laundromat which operated at the Compass Plaza strip mall from 

approximately 2004 to 2007 (Ref. 4, pp. 10, 42). Subsurface soil samples were collected near a solvent 

tank, and between the solvent tank and contaminated well at Compass Plaza (Ref. 4, pp. 10, 42). At the 

Positronics Inc, location, which is east of the Compass Plaza well, soil samples were collected from four 

borings located near a former lagoon and from an irrigation field where process waste water containing 

chlorinated solvents were once sprayed (Refs. 4, pp. 10, 11, 42; 6, pp. 4, 13, 18). At the former woody 

debris burn pile area, soil samples were collected from three boring located in an area where tree debris 

was burned following a 2007 ice storm (Ref. 4, pp. 12, 43). At the residential property were TCE was 

found at high concentrations in the private well (well 176), three soil borings were advanced in areas near 

sinkholes to determine if they may be a source for contamination (Ref. 4, pp. 12, 13, 43). MDNR 

sampled three private ground water wells east Rogersville located in an area used by various commercial 

businesses (Ref. 4, pp. 13, 14, 42). The wells were sampled to determine if ground water contamination 

exists east of Rogersville that would warrant additional investigation. 

Of the five areas investigated, subsurface soil near the Compass Plaza Cleaners & Laundromat was shown 

to contain low concentrations (estimated) of tetrachloroethene (PCE) (Ref. 4, pp. 15, 16). Soil at the 

former Positronics Inc. facility and the former burn area contained low concentrations of non-chlorinated 

volatile organic compounds (VOC) (Ref. 4, pp 15, 16), and all other sample collected to characterize 

possible areas of contamination did not contain any chlorinated volatile organic compounds (Ref. 4, 

pp. 15 – 18). 

In December 2010, EPA investigated allegations of illegal dumping of spent solvents on a property 

around the Rogersville area (Ref. 31). Webster and Greene Counties’ deeds records dating back to 1960 

were searched to determine whether the person allegedly responsible for dumping solvents ever owned 

property in the Rogersville area. No records matching the name of the person in the allegation were 

found (Ref. 31). 

As part of ongoing support to the EPA Region 7 removal program, in May 2011 Tetra Tech START 

collected additional soil and ground water samples to identify potential source areas and further delineate 

impacted private drinking water wells (Refs. 34, pp.8, 11, 13; 35; 36, p. 3). Thirty-four soil samples were 

proposed to be collected at multiple depths in and around sinkholes, in a drainage feature, at the former 

Compass Plaza Laundromat, and at the former Positronics facility (Ref. 34, p. 13). Thirty soil samples 

were actually collected and submitted for VOC analysis from 13 soil borings (Refs. 35, pp. 1 – 30; 36, pp. 

3, 5). The only chlorinated VOC detected in soils was tetrachloroethene (PCE) at a concentration of 30 

micrograms per kilogram (μg/kg) in sample 5367-4 (Ref. 36, pp. 8 – 23). This sample was collected from 

a depth of 6 to 7 feet below ground surface at the former Compass Plaza Laundromat (Ref. 35, p. 4). No 

TCE or cis-1,2-DCE were reported in soil sample 5367-4 (Ref. 36 , pp. 8, 9). No other soil sample 

contained detected levels of any chlorinated volatile organic compound (Ref. 36, pp. 2, 3, 8 – 23). 

September 2011 9 Site Description 
 Source Number: 1 

Investigations conducted to date have not identified the source of the TCE found in ground water. 

Therefore, this site will be scored as a ground water plume with no identified source. 

2.2 SOURCE CHARACTERIZATION 

2.2.1 SOURCE IDENTIFICATION 

Name of source: Ground Water Plume (with no identified source) 

Number of source: 1 

Source Type: Other (Ground Water Plume)

Description and Location of Source (with reference to a map of the site): Figure 2 

Source 1 is a ground water plume located on the west side of Rogersville, Missouri. The well that serves 

the Compass Plaza is located behind the buildings in Compass Plaza and is located most closely to the 

former Compass Cleaners and Laundromat (Ref. 4, pp. 5, 41, 44, 48). The well, constructed in 2004, has 

a total depth of 750 feet and draws water from the Ozark Aquifer (Refs. 4, p. 7; 23). Prior to the summer 

of 2009, the Compass Plaza well was considered a non-community transient water supply (Ref. 4, p. 7). 

In the spring of 2009, the Graceland Daycare connected to the Compass Plaza well which changed the 

status of the well from a transient to a non-transient water supply (Ref. 4, p. 7). A non-transient noncommunity well is defined as a public water system that is not a community water system that regularly 

serves at least 25 of the same persons over 6 months per year (Ref. 4, p. 7). Non-transient noncommunity wells are required to conduct periodic chemical testing. The first such testing was conducted 

by the MDNR’s Public Drinking Water Branch (PDWB) on June 18, 2009 (Ref. 4, pp. 7, 62, 160). TCE 

was detected 3.73 micrograms per liter (μg/L) (Ref. 4, pp. 7, 62, 63). Seven public drinking water wells 

located nearest the site were sampled on a number of occasions between March and July 2010 (Ref. 4, p. 

25). The samples collected by the PDWB documented TCE contamination in a well serving the Citizen’s 

Bank of Rogersville and an irrigation well referred to as the Jamestown Irrigation well (Ref. 4, pp. 7, 28, 

41). These wells are shown in Figures 1 and 5 of the SI/RSE report (Ref. 4, pp. 41, 45). 

Following the initial detection of TCE in the Compass Plaza public well in June 2009, successive rounds 

of sampling were conducted by MDNR beginning with wells nearest Compass Plaza and extending 

outward (Ref. 4, p. 25). After several rounds of sampling public wells, the site was referred to the 

Hazardous Waste Program (HWP) in March 2010 for further assessment under CERCLA (Ref. 4, pp. 4, 

7). Ground water sampling by the HWP included public and private drinking water wells (Ref. 4, pp. 25, 

26). Sampling plans prepared for the domestic well sampling events are provided in the appendix of the 

SI/RSE report (Ref. 4, pp. 1499-1505, 1514-1524, 1538-1543). Ground water samples collected by 

MDNR were analyzed by the state’s environmental laboratory within the Environmental Services 

Program (ESP) by EPA Safe Drinking Water Act Method 524.2 for VOCs (Ref. 4, pp. 26, 1503). 

Private wells located near the site were identified using well records from MDNR Division of Geology 

and Land Survey (DGLS) databases. Additional wells were added to the sampling program based on 

requests by private residents following a public meeting held in Rogersville on May 25, 2010. In all, 

access was gained to 121 private drinking water wells, and these were sampled over the period between 

March and September of 2010 (Ref. 4, p. 26). The list of sampled private wells and the designated code 

for each well sampled by the HWP is included in Table C1 of the SI/RSE report (Ref. 4, pp. 26, 57 -59). 

Figure 5 of the SI/RSE report shows all public and private well sampling locations (Ref. 4, p. 45). 

September 2011 10 Source Characterization 
 Source Number: 1 

September 2011 11 Source Characterization 

During initial rounds of sampling, samples were collected only from outside taps nearest the wellhead. 

Subsequent rounds of sampling also included sample collection at an inside tap (typically the kitchen). 

Duplicate samples were collected, and trip blanks processed as specified in the Quality Assurance Project 

Plan (QAPP) (Ref. 4, p. 26). All samples were submitted to the MDNR’s ESP laboratory for analysis of 

VOCs by EPA drinking water method 524.2 (Ref. 4, p. 26). The analytical data were validated by Tetra 

Tech (Ref. 17). 

In the summer of 2010, MDNR requested that EPA Region 7 to provide alternative water supply to 

households drinking contaminated ground water (Ref. 4, p. 1557-1558). EPA Region 7 tasked the 

START contractor to provide removal assessment support by resampling State identified contaminated 

wells and also perform post filtration sampling at wells where whole house filtration systems were to be 

installed (Ref. 13, pp. 5, 11, 13). Samples were collected on August 16 and 17, 2010 and post filtration 

samples were collected on August 25, 2010 (Ref .14). EPA sampled the same wells that the MDNR 

HWP had previously sampled where TCE contamination had been found. In addition one new well was 

sampled at a residence that was not previously sampled by the state (Ref.14, p. 17). This well contained 

TCE and will be referred to by the sample number which is 5049-15 (Ref. 15, p. 13). 

Ground water wells sampled by MDNR PDWB and HWP and by EPA Region 7 that have been shown to 

be contaminated by TCE are shown on Figure 2 of this documentation record. 
S

September 2011 12 Source C
 Source Number: 1 

2.2.2 HAZARDOUS SUBSTANCES ASSOCIATED WITH THIS SOURCE 

The table below presents all the ground water wells at the site that have been documented to contain one 

or more chlorinated VOCs at a concentration significantly above background concentration as established 

by HRS rule, Table 2-3 (Ref. 1, Section 2.3 and Table 2-3). Further discussion of the general 

characteristics of the aquifer is presented in Section 3.0.1 of this documentation record. What is known 

about the depths of the contaminated wells and the presentation of background well information is 

provided in Section 3.1.1 of this documentation record. The location of the wells presented below is 

shown on Figure 2.

GROUND WATER CONCENTRATIONS 

Sample ID 

Sample 

Designation 

Sample 

Date 

Hazardous

Substance 

Hazardous 

Substance 

Concentration

(μg/L) 

Sample 

Quantitation

Limit** 

(μg/L) References 

AB15892 03/08/2010 TCE 

cis-1,2-DCE

3.07 

1.07 

0.5 

0.5 

4, pp. 28, 68, 69, 165; 17, p. 

Compass 1 

Plaza Well AB16170 03/16/2010 TCE 

cis-1,2-DCE

3.84 

1.21 

0.5 

0.5 

4, pp. 28, 92, 93, 170; 17, p. 

1 

AB15915 03/08/2010 TCE 

cis-1,2-DCE

2.25 

0.66 

0.5 

0.5 Citizen’s 4, pp. 74, 75, 163; 17, p. 1 

Bank of 

Rogersville AB16169 03/16/2010 TCE 

cis-1,2-DCE

2.11 

0.69 

0.5 

0.5 4, pp. 90, 91; 17, p. 1 

Jamestown 

Irrigation 

well 

AB16171 03/16/2010 TCE 

cis-1,2-DCE

4.96 

1.84 

0.5 

0.5 

4, pp.28, 94, 95, 169; 17, p. 

1 

1000438 04/15/2010 TCE 

1,1,2-TCA 

313 

0.84 

0.5 

0.5 

1003701 04/22/2010 TCE 

1,1,2-TCA 

323 

0.83 

0.5 

0.5 

4, pp. 29, 57, 198, 199, 550, 

551, 604, 605, 618, 619; 

Ref. 17, p. 1. MDNR 176a

5049-11 08/17/2010 TCE 180 6.3 14, p.13; 15, pp. 10, 11; 16, 

p. 18 

1000747 04/15/2010 TCE 1.10 0.5 

1003692 04/21/2010 TCE 1.33 0.5 

1003715 09/13/2010 TCE 

cis-1,2-DCE

1.41 

0.5 

0.5 

0.5 

4, pp. 29, 57, 198, 199, 512, 

572, 1327, 1377, 1378; Ref. 

17, p. 1. 

MDNR 168 a

5049-3 08/16/2010 TCE 1.1 0.5 14, p.5; 15, pp. 6, 7; 16, p. 5

1000750 04/15/2010 TCE 

cis-1,2-DCE

2.27 

0.83 

0.5 

0.5 

1003697 04/21/2010 TCE 

cis-1,2-DCE

2.32 

0.92 

0.5 

0.5 

4, pp. 29, 57,198, 199, 524, 

MDNR 170 581, 582; Ref. 17, p. 1. a

5049-5 08/16/2010 TCE 

cis-1,2-DCE

1.2 

0.58 

0.5 

0.5 

14, p.7; 15, pp. 8, 9; 16, 

pp. 7, 8 

1000689 03/30/2010 TCE 

cis-1,2-DCE

5.41 

1.91 

0.5 

0.5 

1000720 04/14/2010 TCE 

cis-1,2-DCE

5.44 

2.03 

0.5 

0.5 

4, pp. 28, 57, 198, 199, 234, 

MDNR 102 235, 378, 404; Ref. 17, p. 1 a

5059-18 08/17/2010 TCE 

cis-1,2-DCE

5.4 

1.8 

0.5 

0.5 

14, p.20; 15, pp. 14, 15; 16, 

pp. 27 - 29 

September 2011 13 Source Characterization 
 Source Number: 1 

GROUND WATER CONCENTRATIONS (Continued) 

Sample ID 

Sample 

Designation 

Sample 

Date 

Hazardous

Substance 

Hazardous 

Substance 

Concentration

(μg/L) 

Sample 

Quantitation

Limit** 

(μg/L) References 

1000724 04/14/2010 TCE 0.89 0.5 

1003725 09/15/2010 TCE 

cis-1,2-DCE

1.26 

0.65 

0.5 

0.5 

4, pp. 28, 57, 198, 199, 420, 

1366, 1381, 1382; Ref. 17, 

p. 1 MDNR 104 a

5049-7 08/16/2010 TCE 1.1 J* 0.5 14, p. 9; 15, pp. 5, 8, 9; 16, 

pp. 10, 11 

1003785 03/31/2010 TCE 

cis-1,2-DCE

4.79 

1.61 

0.5 

0.5 

1000725 04/14/2010 TCE 

cis-1,2-DCE

5.19 

1.8 

0.5 

0.5 

4, pp. 29, 57, 198, 199, 238, 

MDNR 118 239, 390, 424; Ref. 17, p. 1 a

5049-13 08/17/2010 TCE 1.3 0.5 14, p.15; 15, pp. 12, 13; 16, 

pp. 19 - 21 

1003790 03/31/2010 TCE 0.65 0.5 

1000730 04/14/2010 TCE 0.97 0.5 

4, pp. 29, 57, 198, 199, 236, 

MDNR 121 237, 342, 444; Ref. 17, p. 1 a

5049-6 08/16/2010 TCE 0.66 0.5 14, p.8; 15, pp. 8, 9; 16, pp. 

8 - 10 

1003784 03/30/2010 TCE 

cis-1,2-DCE

3.57 

1.28 

0.5 

MDNR 117 0.5 a

1000733 04/14/2010 TCE 

cis-1,2-DCE

2.9 

1.36 

0.5 

0.5 

4, pp. 28, 57, 198, 199, 238, 

239, 386, 456; Ref. 17, p. 1 

1003781 03/30/2010 TCE 

cis-1,2-DCE

6.36 

2.7 

0.5 

0.5 

1000734 04/14/2010 TCE 

cis-1,2-DCE

6.74 

2.47 

0.5 

0.5 

4, pp. 28, 57, 198, 199, 228, 

MDNR 114 229, 320, 460; Ref. 17, p. 1 a

5049-9 08/17/2010 TCE 

cis-1,2-DCE

6.2 

2.2 

0.50 

0.50 

14, p. 11; 15, pp. 10, 11; 16, 

pp. 13, 14 

1000736 04/14/2010 TCE 0.85 0.5 

1003720 09/15/2010 TCE 0.66 0.5 

4, pp. 29, 57, 198, 199, 468, 

1347, 1379, 1380; Ref. 17, 

p. 1 MDNR 124 a

5049-8 08/17/2010 TCE 0.74 0.5 14, p. 10; 15, pp. 8, 9; 16, 

pp. 11 - 13 

1003706 04/22/2010 TCE 

cis-1,2-DCE

4.14 

1.29 

0.5 

0.5 

4, pp. 30, 58, 612, 613, 620, 

MDNR 181 621; Ref. 17, p. 1 a

5049-4 08/16/2010 TCE 

cis-1,2-DCE

4.5 

1.4 

0.5 

0.5 

14, p. 6; 15, pp. 6, 7; 16, pp. 

5, 6 

1000571 06/15/2010 TCE 

cis-1,2-DCE

5.41 

3.13 

0.5 

0.5 

4, pp. 30, 58, 641, 687, 688, 

MDNR 251 783; Ref. 17, p. 1 a

5049-1 08/16/2010 TCE 

cis-1,2-DCE

5.8 

2.6 

0.5 

0.5 

14, p. 3; 15, pp. 6, 7; 16, pp. 

1, 2 

No code EPA sample 

5049-15 08/17/2010 TCE cis-1,2-DCE

4.4 

1.6 

0.5 

0.5 

14, p. 17; 15, pp. 12, 13; 16, 

pp. 22 – 24 

Notes: 

a Well codes are those used by MDNR *

 TCE in this sampled is estimated and the result is biased low due to low recoveries of surrogate analytes (Ref. 15, p. 5) 

J The identification of the analyte is acceptable; the reported value is an estimate (Ref. 15, p. 2) 

** The reporting limits presented in the data packages are equivalent to sample quantitation limits (SQLs) (Ref. 17, p. 1) 

DCE Dichloroethene 

μg/L Micrograms per liter 

TCA Trichloroethane 

TCE Trichloroethene 

September 2011 14 Source Characterization 
 

2.2.3 HAZARDOUS SUBSTANCES AVAILABLE TO A PATHWAY 

Samples collected by MDNR and EPA have shown that contaminants occur in ground water. 

Containment Description 

Containment 

Factor 

Value Reference 

Gas Release to Air: Not scored Not applicable 

Particulate Release to Air: Not scored Not Applicable 

Release to Ground Water: The containment factor value for the ground water 

migration pathway was evaluated for “All Sources” for evidence of hazardous 

substance migration from source area. Applicable containment factor value was 

determined based on existing analytical evidence of hazardous substances in 

ground water samples from public and private wells. Therefore, based on 

evidence of a release, the highest ground water migration pathway containment 

factor value of 10 was assigned as specified in Table 3-2 of the HRS Rule (Ref. 

1, Section 3.1.2.1). 10 

1, Section 

3.1.2.1, Table 

3-2; 

Release through Overland Migration and/or Flood: Not scored Not Applicable 

2.4.2 HAZARDOUS WASTE QUANTITY 

2.4.2.1 Source Hazardous Waste Quantity 

2.4.2.1.1 Hazardous Constituent Quantity (Tier A) 

The information available is not sufficient to evaluate Tier A, as required in Section 2.4.2.1.1 of the HRS 

Rule. As a result, the evaluation of Hazardous Waste Quantity proceeds to evaluation of Tier B, 

hazardous wastestream quantity (Ref. 1, Section 2.4.2.1.1). 

Hazardous Constituent Quantity Assigned Value: Not Scored 

2.4.2.1.2. Hazardous Wastestream Quantity (Tier B) 

The information available is not sufficient to evaluate Tier B. As a result, the evaluation of Hazardous 

Waste Quantity proceeds to evaluation of Tier C, volume (Ref. 1, Section 2.4.2.1.2). 

Hazardous Wastestream Quantity Assigned Value: Not Scored 

2.4.2.1.3. Volume (Tier C) 

For the migration pathways, the source is assigned a value for volume using the appropriate Tier C 

equation from Table 2-5 (Ref. 1, Section 2.4.2.1.3). As measure by geographical information system 

(GIS), the approximate lateral extent of the plume is 636 acres. Because the vertical extent of the ground 

water plume is unknown, the volume for the ground water plume will be designated as unknown, but 

greater than zero. 

Volume Assigned Value: > 0 

September 2011 15 Source Characterization 
 

September 2011 16 Source Characterization 

2.4.2.1.4 Area (Tier D) 

The area measure (Tier D) is not evaluated for source type “other” (Ref. 1, Table 2-5). 

Area of source (ft2): Not evaluated 

Area Assigned Value: Not evaluated 

2.4.2.1.5. Source Hazardous Waste Quantity Value 

As described in the HRS, the highest value assigned to the source from the four measures of hazardous 

waste quantity (Tiers A, B, C, and D) is assigned as the source hazardous waste quantity value (Ref. 1, 

Section 2.4.2.1.5). Thus, the source hazardous waste quantity value is unknown, but greater than zero. 

Source 1 Hazardous Waste Quantity 

Tier Measure Source Values 

Tier A, Hazardous Constituent Quantity NS 

Tier B, Hazardous Wastestream Quantity NS 

Tier C, Volume > 0 

Tier D, Area NS 

Notes: 

> Greater than\ 

NS Not scored 

 Highest assigned value assigned from Table 2-5: > 0; but unknown

SUMMARY OF SOURCE DESCRIPTIONS

Containment Factor Value by Pathway 

Surface Water (SW) Air

Source 

No.

Source 

Hazardous 

Waste 

Quantity 

Value

Source 

Hazardous 

Constituent 

Quantity 

Complete? 

(Yes/No)

Ground 

Water 

(GW) 

(Table 3-2)

Overland/Flood

(Table 4-2)

GW to SW

(Table 3-2)

Gas 

(Table 6-3)

Particulate 

(Table 6-9)

1 > 0 No 10 NS NS NS NS 

Notes: 

> Greater than 

NS Not scored 

Description of Other Possible Sources 

MDNR and EPA have taken efforts to identify the source of the ground water contamination and have not 

located a definitive source to date. Five potential source areas have been identified and sampled; 

however, no clear source of the ground water contamination has been identified (Ref. 4, pp. 17, 18). 

One possible source that was sampled was at the Compass Cleaners & Laundromat which operated in the 

Compass Plaza strip mall from approximately 2004 to 2007 (Ref. 4, pp.10, 42). Initially, dry cleaning 

services were subcontracted out to another location (Ref. 4, p.10). In December 2006, the business 

obtained dry cleaning equipment and provided the service on site (Ref. 4, p.10). An older model 

drycleaner machine was initially bought but was quickly traded for a machine that used a petroleum 
solvent-based system (Ref. 4, pp 1484, 1486, 1488). The solvent tank was located inside the main 

building (Ref. 4, p.10). According to the former owner of the business, solvents used in the first dry 

cleaning machine were most likely a chlorinated solvent such as PCE (Ref. 4, p. 1488). As part of the 

SI/RSE activities, two subsurface borings were advanced on the southwest corner of the laundromat 

building as shown on Figure 2 of the SI/RSE report (Ref. 4, pp. 10, 42). Boring SB04 was located as near 

to the location of the solvent tank as practical (Ref. 4, pp. 10, 42, 50). Soil samples were collected from 

this location at 15.5 feet depth (slightly elevated photo ionization detector reading) and from 28 feet 

(refusal) (Ref. 4, p. 10). A replicate soil sample was collected at the 28 foot depth (Ref. 4, p. 10). Boring 

SB05 was located near the parking lot between the solvent tank and the Compass Plaza public well (Ref. 

4, pp. 10, 42, 51). All soil samples were submitted to the department’s laboratory for analysis of VOCs 

(Ref. 4, p. 10). Low levels of PCE were reported in soil boring SB04 (Ref. 4, pp. 15, 16, 1212, 1213, 

1216, 1217). This area was resampled by EPA in May 2011 (Refs.34, pp.8, 11, 13; 35; 36, p. 3). The 

only chlorinated VOC detected in soils was PCE at a concentration of 30 μg/kg in sample 5367-4 (Ref. 

36, pp. 8 – 22). This sample was collected from a depth of 6 to 7 feet below ground surface at the former 

Compass Plaza Laundromat (Ref. 35, p. 4). No TCE or cis-1,2-DCE were reported in soil sample 5367-4 

(Ref. 36 , pp. 8, 9). No other soil sample contained reportable levels of any chlorinated VOC (Ref. 36, 

pp. 2, 3, 8 – 23). Although PCE is known to degrade into TCE in the environment (Ref. 18, p. 8), this 

area of contaminated soil did not contain any TCE or cis-1,2-DCE (Ref. 36, pp. 3, 8 – 11). 

 

Another potential source investigated is the Positronics Inc. facility, located approximately 0.75 mile east 

of the Compass Plaza well (Ref. 4, p. 42). The facility consists of a 0.6 acre main building in the 

southeast corner of the lot and an out-building located north of the middle of the main building (Ref. 4, 

p. 10). From 1975 until 1983, the property was owned and operated by Positronics, Inc, a company that 

manufactured electronic connectors, which involved electroplating (Ref. 4, p. 1387). They also used TCE 

in their manufacturing process (Ref. 4, p. 1490). Process water from the operation was stored in an 

on-site lagoon which then discharged to a sinkhole (Ref. 4, pp. 1389, 1390, 1399). In 1981, the facility 

prepared a plan to cease discharging to the sinkhole, and to begin applying the process water directly to 

the land into an irrigation field on site (Ref. 4, pp. 1390, 1391, 1400). The irrigation system began 

operating sometime between 1981 and 1987 (Ref. 4, pp. 1387, 1390). The facility closed due to a fire in 

1983 (Ref. 4, p. 1387). In 1993, the lagoon contents were excavated, dewatered, and disposed of in a 

landfill. At some point after 1993, the lagoon was filled in with asphalt and concrete debris (Ref. 4, 

p. 11). 

The Positronics facility was discovered and entered into CERCLIS in November 1986 with a CERCLIS 

Identification number of MOD007447196 (Ref. 7, p. 1). MDNR conducted a Preliminary Assessment 

(PA) on the property in 1987 and a SI in 1989 (Ref. 4, pp. 1387, 1422). The focus of those investigations 

was potential contamination from the nickel, copper, and chromium used in the plating process. 

However, chlorinated solvents were detected in composited shallow soil samples collected in the 

irrigation field (Ref. 4, pp.1430, 1539; Ref. 6, pp. 13, 18). The SI report recommended a Health 

Assessment and a dye trace study (Ref. 4, p. 1433). The Positronics site was archived in January 1994 

and un-archived in March 2010 (Ref. 7, p. 1) 

Three businesses currently operate at the property that was once Positronics: Greenview Manufacturing, 

Fairchild Industries, and Ozark Mountain Concepts. None are known to use or have used chlorinated 

solvents (Ref. 4, p. 11). 

Four soil boring locations were sampled on July 27, 2010 as part of the MDNR SI/RSE in the Positronics 

area (Ref. 4, p. 10, 11, 15). Figure 2 of the SI/RSE report shows the locations of the samples collected 

(Ref. 4, p. 42). One soil boring location was located at the southern tip of the former lagoon location, 

northwest of the storage shed along the grass line (Ref. 4, pp. 11, 42, 51). Soil samples were collected 

from 24.5 feet and from 31 feet. The other three soil boring locations were advanced in the irrigation 

field area. Soil samples were collected from a 1.5 foot depth at each location (Ref. 4, pp. 11, 42, 52). All 

September 2011 17 Source Characterization 
September 2011 18 Source Characterization 

samples were submitted to the department’s laboratory for VOC analysis (Ref. 4, pp. 1176-1189). No 

chlorinated solvents were found in the soil samples submitted for analysis (Ref 4, pp. 15, 16, 42, 1168, 

1184, 1226 – 1244). 

Due to the unique flow characteristics of the upper karst aquifer, tracking a ground water plume to a 

source is difficult. Dye trace studies are proposed for the sinkhole at the former Positronics facility to 

gain a better understanding of the flow characteristics of the aquifer. In addition, soil sampling at the 

sinkholes is proposed to see if one or more of these features may be contributing to the ground water 

contamination. Speculation exists that unauthorized dumping/burial, or disposal of drummed waste may 

have occurred in the Rogersville area (Ref .31). This has yet to be confirmed. 
3.0 GROUND WATER MIGRATION PATHWAY

3.0.1 GENERAL CONSIDERATIONS 

Regional Setting

The Compass Plaza Well site lies on the eastern border of the Springfield Plateau of the Ozark Plateau 

sub-province of the Interior Highlands physiographic province in Missouri (Ref. 8, p. 1). This area is 

characterized by rolling upland hills with low relief (Ref 8, p. 1). Surface elevations at the site are about 

1,463 feet above mean sea level. Mississippian –age limestone lies beneath the site at a depth of about 

30 to 35 feet and includes the Springfield Plateau Aquifer that produces up to 50 gallons per minute and is 

known to provide water for numerous domestic wells. The Mississipian age rocks of the Springfield 

Plateau aquifer are 120 to 130 feet thick at the site (Ref. 8, pp. 1, 3, 29). Depth to water is about 100 feet 

below ground surface (Ref. 8, p. 3). The Springfield Plateau Aquifer is underlain by the Ozark Confining 

unit which is roughly 30 feet thick regionally (Ref. 8, pp. 1, 3, 29). This confining unit forms a leaky 

aquitard that separates the Springfield Plateau and underlying Ozark aquifer (Ref. 8, p. 1). The Ozark 

Aquifer consists of Ordovician- and Cambrian-age dolomite and sandstone (Ref. 8, pp. 2, 29. This 

aquifer is widely used regionally and produces up to 500 gallons per minute (Ref. 8, p. 2). The regional 

thickness of the aquifer is about 1,600 feet (Ref. 8, pp. 4, 29). The Ozark aquifer is underlain by the St. 

Francois Confining unit which consists of 90 feet of alternating argillaceous (clay) dolomite and shale 

that are Cambrian aged (Ref. 8, pp. 2, 4, 29). 

This area is characterized as karstic terrain. Dissolved limestone bedrock has caused many mapped 

sinkholes and 14 springs near the site. In addition to the karstic terrain, the Pearson Fault system aligns 

with the site and is mapped to within 4 miles of the site to the northwest (see Figure 3 of this 

documentation record). The fault system has 10 to 20 feet vertical offsets that may lead to interconnectivity of the shallow Springfield Plateau Aquifer and the deeper Ozark aquifer (Ref. 8, pp. 3, 5, 8). 

Ground Water Migration Pathway Description

Post-Mississippian System 

Soils west of Rogersville are of the Wilderness-Viraton association (Ref 9, p. 5). This association is 

characterized by deep, moderately well drained, gently sloping soils on uplands and terraces (Ref. 9, p. 5). 

The predominant soil type in the area is the Needleye silt loam (Ref. 10, p. 3). The Needleye series 

consist of deep, moderately well drained soils on uplands (Ref. 9, p. 4). These soils formed in a thin 

mantle of loess or other loamy material and clayey residuum weathered from cherty limestone (Ref 9, p. 

4). Needleye silt loam is acidic to neutral (pH 3.6 to 7.3) and hydraulic conductivity is roughly 1.4 x 10-3 

to 4.2 x 10-5 centimeters per second (cm/sec) (Ref. 4, pp. 18, 19). 

The unconsolidated sediments range in thickness from 30 to 35 feet near the site (Ref. 8, p. 2). The 

regolith, or unconsolidated material above competent bedrock, is comprised of bedrock residue from 

chemical weathering and windblown clay. The result is a red, silty clay that contains limestone and chert 

cobbles at depth (Ref. 8, p. 2). Usable ground water is not known to occur in the overburden. 

Stratigraphic unit descriptions are based on logged wells located near the site (Ref. 8, p. 2). The table 

below lists the geohydrologic properties (thickness, lithology, nature of porosity and permeability, 

hydraulic conductivity, and hydrologic unit) of the strata beneath the site. 

September 2011 19 GW - General 
AQUIFER, STRATIGRAPHY, AND HYDROLOGY OF THE COMPASS PLAZA WELL T

System Stratigraphic Unit 

Thickness 

(feet) Lithology 

Nature of Porosity and 

Permeability 

Hydraul

Conductiv

(cm/sec

Post Mississippian Soil and Regolith 30 - 35 Cherty, silty clay Intergranular space throughout matrix with exception of clay; Moderate permeability 1.4x10-3 

4.2x10-

Burlington-Keokuk Limestones, Elsey-Reeds Spring Formation, and Pierson Limestone 120 - 130 Cherty, coarse- grained, fossiliferous limestone Limestone bedding separations, fractures, and dissolution features; High permeability 7.8 x 10

Mississippian Chouteau Group 

(Northview and Compton 

Limestone Formations) 

27 - 30 Argillaceous limestone and shale 

Bedding separations, 

fractures, and possible 

dissolution features; 

Moderately low 

permeability 

1x10-5 

5x10-6

Ordovician Cotter and Jefferson City Dolomites, Roubidoux Formation, and Gasconade Dolomite approx. 1,600 Dolomite, cherty dolomite, sandstone, dolomitic sandstone, 

argillaceous 

dolomite, and minor 

shales 

Bedding separations and 

fractures; 

Moderate permeability 

1 x 10-4 

1 x 10-5

Eminence and Potosi 

Dolomites 

Cambrian Derby-Doe Run Dolomites 90 Medium-crystalline dolomite with beds of silt, shale, and 

sand 

Bedding separations and 

fractures; 

Low permeability 

1x10-8

Source: Ref. 8, p. 29 

September 2011 20 
Mississippian System

The uppermost bedrock units are of Osagean Series of the Mississippian System (Refs. 11, pp. 5, 16, 18; 

12). The Mississippian-age rocks beneath the site are divided (from youngest to oldest) into the 

Burlington Limestone and Reeds Spring-Elsey, and Pierson Formations (Refs. 8, p. 3; 11, p. 5; 12). 

These formations consist of fossiliferous limestone and chert (Ref. 8, p. 3). The Mississippian-age rocks 

in the Springfield Plateau aquifer beneath the site range from approximately 120 to 130 feet thick (Ref. 8, 

p. 3). Due to the acid solubility of limestone, the shallow bedrock is deeply dissolved (karst). The 

dissolution leads to an uneven bedrock surface with cutters and pinnacles along with cave and sinkhole 

formation (Ref. 8, p. 3). Based upon topographic maps, there are many sinkholes lie near the site (Ref. 8, 

p. 5). There are also 14 springs near the site (Ref. 8, p. 5). Based upon this information and the limestone 

bedrock, the site lies within a karst area (Ref. 8, p. 5). 

The Ozark confining unit makes up the deepest and oldest Mississippian-age rocks beneath the site 

consisting of the Northview and Compton Limestone Formations (Ref. 8, p. 3). These formations are 

both in the Chouteau Group (Ref. 8, p. 29). These formations are composed of argillaceous (silty) 

limestone (Ref. 8, p. 3). The Compton Limestone and Northview Formation are roughly 30 feet thick 

beneath the site and form an effective barrier to the underlying Ozark Aquifer where they are not 

compromised by faults or open boreholes (Ref. 8, p. 3). 

Ordovician and Cambrian Systems 

Underlying the Mississippian age formations are primarily dolomites of Ordovician and late Cambrian 

age (Ref. 8, p. 29). These formations described below make up the Ozark Aquifer. The Ozark aquifer 

consists of the Ordovician- and Cambrian-age rocks beneath the site divided into the Jefferson City/Cotter 

Dolomite, Roubidoux Formation, and Gasconade Dolomite formations (Ref. 8, p. 4). These formations 

consist dominantly of dolomite and cherty dolomite with occasional sandstone and cherty sandstone beds 

(Ref. 8, p. 4). The Ordovician-age rocks beneath the site are roughly 1,000 feet thick. The Cambrian-age 

Eminence and Potosi Dolomites consist of medium- to coarsely crystalline dolomite with nodular chert 

(Ref. 8, p. 4). The Cambrian-age rocks beneath the site are 550 feet thick (Ref. 8, p. 4). 

Below the formations encompassing the Ozark aquifer are the Davis Formation (known as the St. 

Francois Confining Unit) and the Bonneterre Dolomite and Lamotte-Regan Sandstone formations 

(Refs. 8, pp 4, 29; 11, p. 5). The latter two formations encompass the St. Francois aquifer (Ref. 11, p. 5). 

The St. Francois aquifer is not known to be used near the site (Ref. 8, pp 4, 29). 

Regional Aquifers

The site is located in the Springfield Plateau ground water province in Missouri which covers all or parts 

of 27 counties in southwestern and west-central part of the state (Ref. 11, pp. 4, 6). Thick dolomites and 

sandstones comprising the St. Francois, Ozark, and Springfield Plateau aquifers underlie the region 

(Ref. 11, p. 4, 6). The state has identified 573 registered wells near the site (Ref. 8, pp 1, 9 - 28). These 

wells are shown on Figure 1 of reference 8 (Ref. 8, p. 7) and reported construction details are presented in 

Table 1 of reference 8 (Ref. 8, pp. 9 – 28). Table 1 shows the database where the well registration is kept, 

the well identification number, the total depth of the well, the footage of casing, the elevation of the well, 

the reported static water level at the well, date installed, use, owner of the well at the time of registration 

and the aquifer, or aquifers it draws from (Ref. 8, pp. 9 – 28). Prior to 1987, registry of private wells was 

not required, so some existing older wells may not be included and the number of private wells may be 

greater than the 573 reported (Ref. 8, p. 2). 

September 2011 21 GW - General 
Springfield Plateau Aquifer: The first aquifer encountered beneath the site is the Springfield Plateau 

Aquifer which is reported at a depth of 100 feet bgs (Ref. 8, p. 3). The aquifer consists of a sequence of 

cherty limestones of Mississippian age (Ref. 8, p. 3). The lowest formation in the aquifer is the Pierson 

Limestone, which is considered by some to belong to the Ozark confining unit (Ref. 11, pp. 5, 7). This 

aquifer produces up to 50 gallons per minute (Ref. 8, p 1). The Springfield Plateau is an unconfined 

karstic aquifer (Ref. 8, p. 3; 11, p 18). The Springfield Plateau Aquifer is known to provide water for 259 

of the 573 wells near the site (Ref 8, p. 1). Based on the reported depth to ground water of 100 feet below 

ground surface and the reported depth to the bottom of the aquifer of between 150 and 165 feet below 

ground surface, this aquifer ranges from roughly 50 to 65 feet thick beneath the site (Ref 8, pp. 3, 29). 

Water reportedly moves westward through the Springfield Plateau Aquifer (Refs. 8, p. 3; 11, p. 18). A 

dye trace study by the state showed movement to the south southeast (Ref 4, pp. 32, 46). The hydraulic 

conductivity of the Springfield Plateau Aquifer is roughly 7.8 x 10-3 centimeters per second (cm/sec) 

(Ref. 8. p. 3). Due to the karst nature, permeability and flow gradient characteristics may vary over short 

distances (Ref. 8, p. 3). 

The Ozark Confining Unit is roughly 30 feet thick at Rogersville (Ref. 12, p. 1). This confining unit 

forms a leaky aquitard that separates the Springfield Plateau and Ozark aquifers (Ref. 8, pp. 1, 3, 5). This 

confining unit consists of Mississippian-age limestone and shale referred to as the Northview and 

Compton Limestone Formations and has a hydraulic conductivity of 1.0 x 10-5 to 5.0 x 10 -6 cm/sec. 

(Ref. 8, pp. 3-4, 29). 

Approximately 45% of the recorded wells near the site have open boreholes connecting the Springfield 

Plateau Aquifer with the underlying Ozark Aquifer (Ref. 8, pp. 1, 2). Also, the Pearson Fault System is 

mapped to within four miles of the site (Ref. 8, pp. 2, 8; also see Figure 3 of this documentation record). 

This fault system is comprised of several en-echelon faults with individual offsets of 10 to 20 feet (Ref. 8, 

p. 2). Within the fault zone, there is sufficient offset to allow interconnection between aquifers. Near the 

site, 568 wells penetrated the Ozark Confining unit. Of these wells, 314 are cased through the confining 

unit (Ref. 8, p. 2). 

Ozark Aquifer: Water infiltration from the Springfield Plateau aquifer through the Ozark confining unit 

is one way the Ozark aquifer is recharged (Ref. 11, pp. 14, 15). The Ozark aquifer consists of the 

Ordovician- and Cambrian-age rocks beneath the site divided into the Jefferson City/Cotter Dolomite, 

Roubidoux Formation, and Gasconade Dolomite formations. These formations consist dominantly of 

dolomite and cherty dolomite with occasional sandstone and cherty sandstone beds (Ref. 8, p. 4). The 

Ordovician-age rocks beneath the site are roughly 1,000 feet thick. The Cambrian-age Eminence and 

Potosi Dolomites consist of medium- to coarsely crystalline dolomite with nodular chert (Ref. 8, p. 4). 

The Cambrian-age rocks beneath the site are 550 feet thick (Ref. 8, p. 4). The Ozark Aquifer has a 

hydraulic conductivity that ranges from 1.0 x 10-4 to 1.0 x 10 -5 cm/sec. (Ref. 8, p. 4). 

Aquifer Interconnections

Information about the geology suggests the Springfield Plateau Aquifer and Ozark Aquifer are 

interconnected. This interconnection is based on the following information: 

• As documented in Section 3.1.1 of this documentation record, TCE was initially detected in three 

wells referred to as the Compass Plaza well, Citizen’s Bank of Rogersville well, and the 

Jamestown Irrigation well (Ref. 4, pp. 5, 41). The Compass Plaza well has steel casing that is 

263 feet long, a total depth of 750 feet and a pump which is set at 465 feet (Ref. 23). The 

Citizen’s Bank of Rogersville well has steel casing that is 260 feet long, a total depth of 545 feet 

and a pump which is set at 360 feet (Ref. 24). The Jamestown Irrigation well has steel casing that 

is 210 feet long, a total depth of 600 feet and a pump which is set at 460 feet (Ref. 25). All three 

September 2011 22 GW - General 
September 2011 23 GW - General 

wells are cased through the Ozark confining unit and draw from the Ozark aquifer (Ref. 8, p. 29). 

These wells provide evidence that TCE has migrated to the Ozark aquifer. 

• Two of the domestic wells samples by MDNR and EPA are completed and draw exclusively from 

the lower Ozark aquifer and have been shown through analytical evidence to contain TCE 

indication contamination has migrated across the confining unit. The domestic wells with state 

well identification numbers of 0273248A and 0090275A reportedly draw from the Ozark aquifer 

exclusively (Ref. 8, pp. 9, 10). As documented in Section 3.1.1 these wells with MDNR 

designations of 102 and 121 contain TCE indicating contamination has migrated through the 

Ozark confining unit (Ref. 4, p. 57). 

• Approximately 254 of the 573 recorded and registered wells near the site have open (uncased) 

boreholes connecting the Springfield Plateau Aquifer with the underlying Ozark Aquifer (Ref. 8, 

pp. 1, 2). Of these, 71 are reported to be open hole completions drawing from both the 

Springfield Plateau and Ozark aquifers within approximately 2-miles of the site (Ref. 8, pp. 9 – 

14). In these wells that are registered with the state, casing lengths range from five feet long 

(Ref. 8, p. 10) to 130 feet long (Ref. 8, p. 12). Prior to 1987, registry of private wells was not 

required (Ref. 8, p. 2). Registered domestic wells installed before 1970, typically have casing 

lengths of less than 50 feet and draw from both aquifers (Ref. 8, pp. 9, 10, 15, 21). Therefore, 

older domestic unregistered wells within two miles are likely of open hole construction and draw 

from both aquifers. 

• The 30 foot thick Ozark Confining unit is described by the Missouri Geological Survey Program, 

Division of Geology and Land Survey as being a leaky aquitard (Ref. 8, p. 1), and that the Ozark 

aquifer is recharged to a large extent from the Springfield Plateau aquifer (Ref. 11, pp. 14, 15). 

SUMMARY OF AQUIFER(S) BEING EVALUATED 

Aquifer 

No. Aquifer Name 

Is Aquifer 

Interconnected with 

Surficial Aquifer within 

2 miles? (Y/N/NA) 

Is Aquifer 

Continuous Within 

4-mileTDL? (Y/N) 

Is Aquifer 

Karst? (Y/N) 

1 Springfield Plateau 

Aquifer NA Yes Yes 

2 Ozark Aquifer Yes Yes No 
3.1 LIKELIHOOD OF RELEASE 

3.1.1 OBSERVED RELEASE 

Direct Observation:

An observed release by direct observation is not scored. 

Chemical Analysis:

As documented below, an observed release to the ground water migration pathway in the combined 

Springfield Plateau and Ozark aquifer has been established. This is based on analysis of ground water 

collected from private, irrigation and community drinking water wells with open hole construction across 

both aquifers. 

The well that serves the Compass Plaza is located behind the buildings in Compass Plaza and is located 

most closely to the former Compass Cleaners & Laundromat (Ref. 4, pp. 5, 41, 44, 48). The well, 

constructed in 2004, has a total depth of 750 feet and draws water from the Ozark Aquifer (Refs. 4, 

p. 7; 23). Prior to the summer of 2009, the Compass Plaza well was considered a non-community 

transient water supply (Ref. 4, p. 7). A non-community transient water supply is defined as serving an 

average of at least 25 individuals daily at least 60 days out of the year, and is not required under Missouri 

regulations to conduct extensive chemical testing (Ref. 4, p. 7). In the spring of 2009, the Graceland 

Daycare connected to the Compass Plaza well which changed the status of the well from a transient to a 

non-transient water supply (Ref. 4, p. 7). A non-transient non-community well is defined as a public 

water system that is not a community water system that regularly serves at least 25 of the same persons 

over 6 months per year (Ref. 4, p. 7). Non-transient non-community wells are required to conduct 

periodic chemical testing. The first such testing was conducted on June 18, 2009 (Ref. 4, p. 7). TCE was 

detected at 3.73 μg/L (Ref. 4, pp. 7, 62, 63). The Compass Plaza well was disconnected on September 29, 

2010 (Ref. 4, pp. 7, 1555). The Compass Plaza development is now served by water supplied by the City 

of Rogersville Public Water System (Ref. 4, p. 7). 

Following the initial detection of TCE in the Compass Plaza public well in June 2009, successive rounds 

of sampling were conducted by MDNR beginning with wells nearest Compass Plaza and extending 

outward (Ref. 4, p. 25). Sampling plans prepared for the domestic well sampling events are provided in 

the appendix of the SI/RSE report (Ref. 4, pp. 1499-1505, 1514-1524, 1538-1543). Ground water 

samples collected by MDNR were analyzed by the state’s environmental laboratory within the 

Environmental Services Program by EPA safe drinking water act method 524.2 for volatile organic 

compounds. (Ref. 4, pp. 26, 1503). Seven public drinking water wells located nearest the site were 

sampled on a number of occasions between March and July 2010 (Ref. 4, p. 25). These wells are shown 

in Figure 5 of the SI/RSE report (Ref. 4, p. 45). These wells are also provided on Figures 2 and 3 of this 

documentation record. 

Private wells located near the site were identified using well records from MDNR Division of Geology 

and Land Survey (DGLS) databases. Additional wells were added to the sampling program based on 

requests by private residents following a public meeting held in Rogersville on May 25, 2010. In all, 

access was gained to 121 private drinking water wells, and these were sampled over the period between 

March, April and September of 2010 (Ref. 4, p. 26). The list of sampled private wells is included in 

Table C1 of the SI/RSE report (Ref 4, pp. 57 -59). Figure 5 of the SI/RSE report shows all public and 

private well sampling locations (Ref. 4, p. 45). 

September 2011 24 GW – Likelihood of Release 
September 2011 25 GW – Likelihood of Release 

During initial rounds of sampling, samples were collected only from outside taps nearest the wellhead. 

Subsequent rounds of sampling also included sample collection at an inside tap (typically the kitchen). 

Duplicate samples were collected, and trip blanks processed as specified in the Quality Assurance Project 

Plan (QAPP) (Ref. 4, p. 26). All samples were submitted to the department’s Environmental Services 

Program (ESP) laboratory for analysis of VOCs by EPA drinking water method 524.2 (Ref. 4, p. 26). 

The analytical data were validated by Tetra Tech (Ref. 17). The reporting limits presented in the data 

packages are equivalent to sample quantitation limits (SQLs) (Ref. 17, p. 1). 

In the summer of 2010, MDNR requested that EPA Region 7 to provide alternative water supply to 

households drinking contaminated ground water (Ref. 4, p. 1557-1558). EPA Region 7 tasked the 

START contractor to provide removal assessment support by resampling State identified contaminated 

wells and also perform post filtration sampling at wells where wholehouse filtration systems were to be 

installed (Ref. 13, pp. 5, 11, 13). Samples were collected August 16 and 17, 2010 and post filtration 

samples were collected August 25, 2010 (Ref.14). 

Chlorinated solvents reported by both EPA and MDNR in private wells include TCE, 

1,1,2-trichloroethane (TCA), and cis-1,2-dichloroethene (DCE) (Refs.4, pp. 28, 29, 30; 15, pp. 3, 10, 11). 

The locations of the wells sampled are shown on Figure 5 of the SI/RSE report (Ref. 4, p 45). The 

following pages further discuss background concentration and release samples used in establishing an 

observed release by chemical analysis. 
Background Concentrations: 

The MDNR performed multiple rounds of public and private water well samples. Initial sampling was 

conducted by the MDNR’s PDWB and focused on public wells (Ref. 4, pp. 4, 7). After several rounds of 

sampling public wells, the site was referred to the MDNR HWP in March 2010 for further assessment 

under CERCLA (Ref. 4, pp. 4, 7). Ground water sampling by the HWP included public and private 

drinking water wells (Ref. 4, pp. 25, 26). Access was gained by the HWP to 121 private drinking water 

wells which were sampled between March and September of 2010 (Ref. 4, p. 26). Chlorinated solvents 

were reported by the State in 12 of the 121 wells sampled (Ref. 4, pp. 28 – 30). 

Initial sampling by the PDWB in June, July and September of 2009 did not include background well 

sampling (Ref. 4, pp. 62 – 67). Only the well associated with Compass Plaza is known to have been 

sampled in 2009. On March 8, and 16, 2010 additional public water supply wells were sampled including 

the Compass Plaza well (Ref. 4, pp. 68, 92), City of Rogersville well 4 (Ref. 4, p. 70), City of Rogersville 

well 1 (Ref. 4, p. 72), Citizens Bank of Rogersville well (Ref. 4, pp. 74, 90), Bills Quick Mart well 

(Ref. 4, p. 76), Logan Rogersville Middle School well (Ref. 4, p. 80), Logan Rogersville High School 

well (Ref. 4, p. 82), Logan Rogersville Primary School well (Ref. 4, p. 84), Willow Green Gardens Tree 

Farm well (Ref. 4, p. 86), and the Jamestown Irrigation well (Ref. 4, p. 94). Samples were analyzed for 

VOCs using EPA method 524.2 (Ref. 4, pp. 70-87). 

Later sampling by the state HWP did consider background sampling. The HWP designated three wells as 

background as part of their investigation (Ref. 4, pp. 30, 57, 58). These wells were designated as well 

162, 163 and 179 (Ref 4, pp. 30, 57, 58). The inset of Figure 5 of the SI/RSE report shows two of the 

wells to be west of Rogersville and the third to be east of Rogersville (Ref. 4, p. 45). It appears these 

wells were sampled one time in April of 2010 (Ref. 4, p. 30). Samples were analyzed for VOCs using 

EPA method 524.2 (Ref. 4, p. 197). No information was provided on well depths for any of the 

background wells sampled by the HWP. Although these three wells were designated as background, 

there are many other wells that were sampled during the SI/RSE evaluation that did not contain TCE, cis1,2-DCE or 1,1,2-TCA. Figure 5 of the SI/RSE report (Ref. 4, p. 45) shows most of the private wells 

sampled. On that map only the wells shaded red or orange contained measurable levels of TCE, all others 

shown did not contain TCE (Ref. 4, pp. 26 – 30, 45). 

Initial sampling by EPA occurred in August 2010 in accordance with the QAPP dated August 13, 2010 

(Refs. 13, 14). Initial sampling by EPA was at private wells where contamination was found previously 

by MDNR as well as several other private wells located near the area of known contamination (Ref. 13, 

pp. 5, 13). In addition, post filtration samples were collected from homes with newly installed wholehouse filtration systems (Refs. 13, pp. 5, 13; 14, pp. 12, 14, 16, 18, 19, 21). These samples were analyzed 

for VOCs under the EPA contract lab program (CLP) using EPA Region 7 Method 3230.09, which meets 

the requirements of EPA Method 524.2 (Refs. 13, p. 8; 14, pp. 3-24; 15, p. 4; 16; 39, p. 1). Of the wells 

sampled, one well at 10118 East Farm Road 186, was shown to be free of TCE contamination and is 

selected as background. This well was also sampled by the state of Missouri and is listed as MDNR 

location ID 177 (Refs. 4, pp. 45, 57; 14, p. 22; 15, p. 3, 15). No information was available pertaining to 

the depth of the well. 

The locations of all background wells in relation to the ground water plume are shown on Figure 3 of this 

documentation record. Known information about the depths of the wells is presented in the table on the 

following page. 

September 2011 26 GW – Likelihood of Release 
September 2011 27 GW – Likelihood of Release 

BACKGROUND WELL INFORMATION 

Well Codea

Screened 

Interval* 

(ft bgs) 

Well 

Depth 

(ft bgs) 

Well 

Depth 

(ft amsl) 

Year 

Drilled References 

162 Not 

Reported 

Not 

Reported Unknown Not Reported 

4, pp. 196 – 200, 214, 

483 - 486 

163 Not 

Reported 

Not 

Reported Unknown Not Reported 

4, pp. 196 – 200, 214, 

487 - 490 

179 Not 

Reported 

Not 

Reported Unknown Not Reported 

4, pp. 196 – 200, 216, 

560 - 563 

Rogersville W1 175 – 1,260 1,260 221 1954 20, p. 2; 37, p. 1; 38, pp. 

1, 3 

Rogersville W4 450 – 1,150 1,150 unknown 1996 20, p. 2; 

Bills Quick Mart well 200 - 600 600 unknown 1984 26, p. 3 

Logan Rogersville Middle 

School well 350 – 685 685 738 1967 27 

Logan Rogersville High 

School well 358 – 1,005 1,005 415 2004 28 

Logan Rogersville 

Primary School well 257 - 758 758 668 1956 29 

Willow Green Gardens 

Tree Farm well 197 - 810 810 unknown 2000 30 

177 

 (EPA sample 5049-20) 

Not 

Reported 

Not 

Reported Unknown Not Reported 4, pp. 45, 57; 14, p. 22 

Notes: 

a Well codes for private wells sampled by MDNR HWP are explained in reference 4, pp. 57, 58, 59. 

* Wells in the Springfield plateau typically consist of an unlined, open borehole below the casing (Ref. 11, 

pp. 21 - 24). 

ft bgs Feet below ground surface 

ft amsl Feet above mean sea level 

NA Not available 
BACKGROUND CONCENTRATIONS 

Well 

Codea

Laboratory 

Number 

Sample 

Date Contaminant 

Contaminant 

Concentration (μg/L)

Reporting Limit 

(μg/L) 

162 1000740 04/14/2010 

TCE 

cis-1,2-DCE 

1,1,2-TCA 

ND ND ND 

0.5 0.5 0.5 

4, 48

163 1000741 04/14/2010 

TCE 

cis-1,2-DCE 

1,1,2-TCA 

ND ND ND 

0.5 0.5 0.5 

4, 48

179 1000441 04/15/2010 

TCE 

cis-1,2-DCE 

1,1,2-TCA 

ND ND ND 

0.5 0.5 0.5 

4, 56

4, 

Rogersville WL1 AB15914 03/08/2010 

TCE 

cis-1,2-DCE 

1,1,2-TCA 

ND ND ND 

0.5 0.5 0.5 

Rogersville WL4 AB15913 03/08/2010 

TCE 

cis-1,2-DCE 

1,1,2-TCA 

ND ND ND 

0.5 0.5 0.5 

4, 

Bills Quick Mart AB16162 03/16/2010 

TCE 

cis-1,2-DCE 

1,1,2-TCA 

ND ND ND 

0.5 0.5 0.5 

4, 

Logan Rogersville Middle 

School AB16164 03/16/2010 

TCE 

cis-1,2-DCE 

1,1,2-TCA 

ND ND ND 

0.5 0.5 0.5 

4, 

Logan Rogersville High 

School AB16165 03/16/2010 

TCE 

cis-1,2-DCE 

1,1,2-TCA 

ND ND ND 

0.5 0.5 0.5 

4, 

Logan Rogersville Primary 

School AB16166 03/16/2010 

TCE 

cis-1,2-DCE 

1,1,2-TCA 

ND ND ND 

0.5 0.5 0.5 

4, 

Willow Green Gardens Tree 

Farm AB16167 03/16/2010 

TCE 

cis-1,2-DCE 

1,1,2-TCA 

ND ND ND 

0.5 0.5 0.5 

4, 

177 5049-20 08/25/2010 

TCE 

cis-1,2-DCE 

1,1,2-TCA 

ND ND ND 

0.5 0.5 0.5 

4, pppp

Notes: a Well codes are explained in reference 4, pp. 57, 58, 59. September 2011 28 GW 
September 2011 29 GW 

μg/L Micrograms per liter DCE Dichloroethene ND Not detected TCA Trichloroethane TCE Trichloroethene
Contaminant Concentrations: 

Contaminated samples documenting the observed release were collected from private and public drinking 

water wells. Well information such as screening interval, well depth, and year drilled was not available 

for most of the private wells because they were not registered with the State of Missouri, current owners 

did not know the depths of wells, or investigators failed to collect the information. 

CONTAMINATED WELL INFORMATION 

Well Codea

Screened 

Interval * 

(ft bgs) 

Depth 

(ft bgs) 

Depth 

(ft amsl) 

Year 

Drilled References 

Compass Plaza Well 263 - 750 750 unknown 2004 23 

Citizen’s Bank of 

Rogersville 260 - 545 545 935 2001 24 

Jamestown Irrigation well 210 - 600 600 unknown 2008 25 

MDNR 176 Not Reported Not 

Reported unknown unknown 4, pp. 29, 57, 198, 199 

MDNR 168 Not Reported Not 

Reported unknown unknown 4, pp. 29, 57, 198, 199

MDNR 170 Not Reported Not 

Reported unknown unknown 4, pp. 29, 57, 199 

MDNR 102 168 - 522 522 908 2001 4, pp. 28, 57, 198; 8, p. 9 

MDNR 104 Not Reported Not 

Reported unknown unknown 4, pp. 28, 57, 198, 199 

MDNR 118 Not Reported Not 

Reported unknown unknown 4, pp. 29, 57, 198, 199 

MDNR 121 147 - 405 405 1045 1993 4, pp. 29, 57, 198, 199; 

8, p. 10 

MDNR 117 Not Reported Not 

Reported unknown unknown 4, pp. 29, 57, 198, 199 

MDNR 114 Not Reported Not 

Reported unknown unknown 4, pp. 28, 57, 198, 199 

MDNR 124 Not Reported Not 

Reported unknown unknown 4, pp. 29, 57, 198, 199

MDNR 181 Not Reported Not 

Reported unknown unknown 4, pp. 30, 58,198, 199 

MDNR 251 Not Reported Not 

Reported unknown unknown 4, pp. 30, 58, 198, 199 

No code 

EPA sample 5049-15 Not Reported ~400 unknown 1976 14, p. 17; 19, p. 10 

Notes: 

* Wells in the Springfield plateau typically consist of an unlined, open borehole below the casing (Ref. 11, 

pp. 21 - 24). a Well codes are explained in reference 4, pp. 57, 58, 59.

ft bgs Feet below ground surface 

ft amsl Feet above mean sea level 

September 2011 30 GW – Likelihood of Release 
CONTAMINATED WELL SAMPLE CONCENTRATIONS 

Well Codea Laboratory Number Sample Date Contaminant 

Contaminant 

Concentration 

(μg/L) 

Method 

Reporting Limit

(μg/L) Refer

AB15892 03/08/2010 TCE cis-1,2-DCE 3.07 1.07 0.5 0.5 4, pp. 28, 68, 69, 165; 1

Compass Plaza Well AB16170 03/16/2010 TCE cis-1,2-DCE 3.84 1.21 0.5 0.5 4, pp. 28, 92, 93, 170; 1

AB15915 03/08/2010 TCE cis-1,2-DCE 2.25 0.66 0.5 0.5 4, pp. 74, 75, 163; 17, p

Citizen’s Bank of Rogersville AB16169 03/16/2010 TCE cis-1,2-DCE 2.11 0.69 0.5 0.5 4, pp. 90, 91; 17, p. 1 Jamestown Irrigation well AB16171 03/16/2010 TCE cis-1,2-DCE 4.96 1.84 0.5 0.5 4, pp.28, 94, 95, 169; 17

1000438 04/15/2010 TCE 1,1,2-TCA 313 0.84 0.5 0.5 1003701 04/22/2010 TCE 1,1,2-TCA 323 0.83 0.5 

4, pp. 29, 57, 198, 199, 618, 619; Ref. 17, p. 1. 

0.5

176 

5049-11 08/17/2010 TCE 180 6.3 14, p.13; 15, pp. 10, 11

1000747 04/15/2010 TCE 1.10 0.5 1003692 04/21/2010 TCE 1.33 0.5 4, pp. 29, 57, 198, 199, 

1378; Ref. 17, p. 1. 1003715 09/13/2010 TCE cis-1,2-DCE 1.41 0.5 0.5 0.5 168 

5049-3 08/16/2010 TCE 1.1 0.5 4, p. 57; 14, p.5; 15, pp

1000750 04/15/2010 TCE cis-1,2-DCE 2.27 0.83 0.5 0.51003697 04/21/2010 TCE cis-1,2-DCE 2.32 0.92 0.5 

4, pp. 29, 57,198, 199, 5p. 1. 

0.5 

170 

5049-5 08/16/2010 TCE cis-1,2-DCE 1.2 0.58 0.5 0.5 14, p.7; 15, pp. 8, 9; 16

1000689 03/30/2010 TCE cis-1,2-DCE 5.41 1.91 0.5 0.5 1000720 04/14/2010 TCE cis-1,2-DCE 5.44 2.03 0.5 

4, pp. 28, 57, 198, 199, Ref. 17, p. 1 

0.5 

102 

5049-18 08/17/2010 TCE cis-1,2-DCE 5.4 1.8 0.5 0.5 14, p.20; 15, pp. 14, 15

1000724 04/14/2010 TCE 0.89 0.5 1003725 09/15/2010 TCE cis-1,2-DCE 1.26 0.65 0.5 4, pp. 28, 57, 198, 199, 

Ref. 17, p. 1 0.5 104 

5049-7 08/16/2010 TCE 1.1 J* 0.5 14, p. 9; 15, pp. 5, 8, 9; 

September 2011 31 GW – 
CONTAMINATED WELL SAMPLE CONCENTRATIONS (Continued) 

September 2011 32 GW 

Well Codea Laboratory Number Sample Date Contaminant 

Contaminant 

Concentration 

(μg/L) 

Method 

Reporting Limit

(μg/L) Refer

1003785 03/31/2010 TCE cis-1,2-DCE 4.79 1.61 0.5 0.5 1000725 04/14/2010 TCE cis-1,2-DCE 5.19 1.8 0.5 0.5 

4, pp. 29, 57, 198, 199, Ref. 17, p. 1 118 

5049-13 08/17/2010 TCE 1.3 0.5 14, p.15; 15, pp. 12, 13

1003790 03/31/2010 TCE 0.65 0.5 1000730 04/14/2010 TCE 0.97 0.5 

4, pp. 29, 57, 198, 199, Ref. 17, p. 1 121 

5049-6 08/16/2010 TCE 0.66 0.5 14, p.8; 15, pp. 8, 9; 16

1003784 03/30/2010 TCE cis-1,2-DCE 3.57 1.28 0.5 117 0.5 

1000733 04/14/2010 TCE cis-1,2-DCE 2.9 1.36 0.5 0.5 

4, pp. 28, 57, 198, 199, Ref. 17, p. 1 

1003781 03/30/2010 TCE cis-1,2-DCE 6.36 2.7 0.5 0.5 1000734 04/14/2010 TCE cis-1,2-DCE 6.74 2.47 0.5 0.5 

4, pp. 28, 57, 198, 199, 

114 Ref. 17, p. 1 

5049-9 08/17/2010 TCE cis-1,2-DCE 6.2 2.2 0.50 0.50 14, p. 11; 15, pp. 10, 11

1000736 04/14/2010 TCE 0.85 0.5 1003720 09/15/2010 TCE 0.66 0.5 

4, pp. 29, 57, 198, 199, Ref. 17, p. 1 124 

5049-8 08/17/2010 TCE 0.74 0.5 14, p. 10; 15, pp. 8, 9; 1

1003706 04/22/2010 TCE cis-1,2-DCE 4.14 1.29 0.5 0.5 4, pp. 30, 58, 612, 613, 

181 

5049-4 08/16/2010 TCE cis-1,2-DCE 4.5 1.4 0.5 0.5 14, p. 6; 15, pp. 6, 7; 16

1000571 06/15/2010 TCE cis-1,2-DCE 5.41 3.13 0.5 0.5 4, pp. 30, 58, 641, 687, 

251 

5049-1 08/16/2010 TCE cis-1,2-DCE 5.8 2.6 0.5 0.5 14, p. 3; 15, pp. 6, 7; 16

No code, EPA sample 5049-15 5049-15 08/17/2010 TCE cis-1,2-DCE 4.4 1.6 0.5 0.5 14, p. 17; 15, pp. 12, 13

Notes: a Well codes are those used by MDNR * TCE in this sampled is estimated and the result is biased low due to low recoveries of surrogate analytes (Ref. 15, p. 5) 

J The identification of the analyte is acceptable; the reported value is an estimate (Ref. 15, p. 2) DCE Dichloroethene μg/L Micrograms per liter TCA Trichloroethane TCE Trichloroethene 
Level I Samples

A Level I drinking water sample is defined as a drinking water sample with concentration of a hazardous 

substance such as TCE that meets the criterion of an observed release at or above the hazardous 

substance’s drinking water benchmark (Ref. 1, Section 2.5.2). Health-based benchmarks for the ground 

water migration pathway include the maximum contaminant level (MCL), the cancer risk screening 

concentration (CRSC), and the Non Cancer Risk screening concentration (NCRSC) (Ref. 1, Table 3-10). 

The EPA has set the following health-based benchmarks for TCE, cis-1,2-DCE, and 1,1,2-TCA: 

• For TCE, MCL is 0.005 mg/L (5 μg/L), CRSC is 0.00021 mg/L (0.21 μg/L), and NCRSC is 

0.011 mg/L (11 μg/L) (Ref. 2, p. 6). 

• For cis-1,2-DCE, MCL is 0.070 mg/L (70 μg/L) and NCRSC is 0.36 mg/L (360 μg/L) (Ref. 2, 

p, 13). 

• For 1,1,2-TCA, MCL is 0.003 mg/L (3 μg/L), CRSC is 0.0015 mg/L (1.5 μg/L), and NCRSC is 

0.15 mg/L (150 μg/L) (Ref. 2, p, 14). 

The lowest benchmark for TCE is the CRSC which is 0.21 μg/L. As shown in the contaminated well 

sample concentrations table above, none of the wells contained cis-1,2-DCE or 1,1,2-TCA at 

concentrations that exceed any benchmarks. The following table shows the drinking water samples 

collected at Compass Plaza Well TCE that exceeded the CRSC for TCE. 

Well Codea Sample Date 

TCE 

Concentration 

(μg/L) Reference 

03/08/2010 3.07 Compass Plaza Well 03/16/2010 3.84 

2, p. 6; 4, pp. 28, 68, 69, 92, 93, 

165, 170 

03/08/2010 2.25 Citizens Bank of Rogersville 03/16/2010 2.11 

2, p. 6; 4, pp.74, 75, 90, 91, 163 

04/15/2010 313 

04/22/2010 323 MDNR 176 

08/17/2010 180 

2, p. 6; 4, pp. 29, 57, 198, 199, 550, 

551, 604, 605, 618, 619; 14, p.13; 

15, pp. 10, 11; 16, p. 18 

04/15/2010 1.10 

04/21/2010 1.33 

09/13/2010 1.41 

2, p. 6; 4, pp. 29, 57, 198, 199, 512, 

572, 1327, 1377, 1378; 14, p.5; 15, 

pp. 6, 7 

MDNR 168 

08/16/2010 1.1 

04/15/2010 2.27 

04/21/2010 2.32 MDNR 170 

08/16/2010 1.2 

2, p. 6; 4, pp. 29, 57, 198, 199, 524, 

581, 582; 14, p.7; 15, pp. 8, 9 

03/30/2010 5.41 

04/14/2010 5.44 MDNR 102 

08/17/2010 5.4 

2, p. 6; 4, pp. 28, 57, 198, 199, 234, 

235, 378, 404; 14, p.20; 15, pp. 14, 

15 

04/14/2010 0.89 

09/15/2010 1.26 MDNR 104 

08/16/2010 1.1 

2, p. 6; 4, pp. 28, 57, 198, 199, 420, 

1366, 1381, 1382; 14, p. 9; 15, pp. 

5, 8, 9 

03/31/2010 4.79 

04/14/2010 5.19 MDNR 118 

08/17/2010 1.3 

2, p. 6; 4, pp. 29, 57, 198, 199, 238, 

239, 390, 424; 14, p.15; 15, pp. 12, 

13 

September 2011 33 GW – Likelihood of Release 
September 2011 34 GW – Likelihood of Release 

Well Codea

 Sample Date 

TCE 

Concentration 

(μg/L) Reference 

03/31/2010 0.65 

04/14/2010 0.97 

MDNR 121 

08/16/2010 0.66 

2, p. 6; 4, pp. 29, 57, 198, 199, 236, 

237, 342, 444; 14, p.8; 15, pp. 8, 9 

MDNR 117 03/30/2010 3.57 

04/14/2010 2.9 

2, p. 6; 4, pp. 28, 57, 198, 199, 238, 

239, 386, 456 

03/30/2010 6.36 

04/14/2010 6.74 MDNR 114 

08/17/2010 6.2 

2, p. 6; 4, pp. 28, 57, 198, 199, 228, 

229, 320, 460; 14, p. 11; 15, 

pp. 10, 11 

04/14/2010 0.85 

09/15/2010 0.66 MDNR 124 

08/17/2010 0.74 

2, p. 6; 4, pp. 29, 57, 198, 199, 468, 

1347, 1379, 1380; 14, p. 10; 15, 

pp. 8, 9 

MDNR 181 04/22/2010 4.14 

08/16/2010 4.5 

2, p. 6; 4, pp. 30, 58, 612, 613, 620, 

621; 14, p. 6; 15, pp. 6, 7 

MDNR 251 06/15/2010 5.41 

08/16/2010 5.8 

2, p. 6; 4, pp. 30, 58, 641, 687, 688, 

783; 14, p. 3; 15, pp. 6, 7 

No code 

(EPA sample 5049-015) 08/17/2010 4.4 

2, p. 6; 14, p. 17; 15, pp. 12, 13 

Notes: 

a Well code is designated by the MDNR (Ref. 4, pp. 57 – 59).

μg/L Micrograms per liter 

 

As documented above and shown in Figure 2, chlorinated solvents including TCE, 1,1,2-TCA and cis1,2-DCE were reported in public and private wells located to the south and west of Rogersville, Missouri. 

By mid June 2010, the MDNR HWP had sampled 121 wells and 13 contained TCE; six of these wells had 

TCE at concentrations exceeding the EPA MCL (Ref. 4, pp 1538, 1539). Numerous private wells around 

the plume have been sampled and shown not to contain the chlorinated solvents (Ref. 4, pp. 25, 26, 45). 

Also as part of the SI, the state conducted a search for possible sources of the ground water contamination 

and collected soil samples from suspect areas (Ref. 4, pp. 9 – 17). No source of the TCE in ground water 

was identified (Ref. 4, p. 17). As documented in Section 2.2, investigations conducted to date in and 

around Rogersville have not identified a definite source for the chlorinated solvents found in ground 

water. 

Hazardous Substance Released

Significantly elevated concentrations of VOCs including TCE, cis-1,2-DCE and 1,1,2-TCA have been 

observed in ground water sampled from public and private drinking water wells south and west of 

Rogersville Missouri. Sampling activities conducted to date have not identified the source of chlorinated 

solvents found in ground water wells. Because the area is karst, and ground water flow is unpredictable, 

tracking this contamination back to a source containing TCE, 1,2-DCE, and/or 1,1,2-TCA has been 

unsuccessful. In accordance with Section 3.1.1 of reference 1, an observed release by chemical analysis 

has been established and a value of 550 is assigned below and entered on line 1 of HRS Table 3-1. 

Because an observed release has been established, potential to release is not evaluated. 

Ground Water Observed Release Factor Value: 550 
3.2 WASTE CHARACTERISTICS 

3.2.1 TOXICITY/MOBILITY 

The hazardous substances listed in the table below have been documented in and associated with the 

ground water plume (Source 1). As documented in section 3.1.1 above, these hazardous substances were 

detected in release samples at concentrations significantly exceeding background levels. 

Hazardous 

Substance 

Source 

No. 

Toxicity 

Factor 

Value 

Mobility 

Factor 

Value 

Does Hazardous 

Substance Meet 

Observed 

Release? (Y/N) 

Toxicity/ 

Mobility 

(Table 3-9) References 

1,1,2-

Trichloroethane 1 1,000 1 Yes 1,000 

1, Sections 3.2.1, 

3.2.1.2; 2, p. 12 

Trichloroethene 1 10,000 1 Yes 10,000 1, Sections 3.2.1, 

3.2.1.2; 2, p. 6 

cis-1, 2-

Dichloroethene 

1 100 1 Yes 100 1, Sections 3.2.1, 

3.2.1.2; 2, p. 11 

In accordance with Section 3.2.1.3 of reference 1, the hazardous substance with the highest 

toxicity/mobility factor value is entered below and on line 4 of Table 3-1. This hazardous constituent is 

trichloroethene with a toxicity/mobility factor value of 10,000. 

Toxicity/Mobility Factor Value: 10,000 

(Reference 1, Table 3-9) 

3.2.2 HAZARDOUS WASTE QUANTITY 

Source No. Source Name Source Type 

Source Hazardous 

Waste Quantity 

1 Ground Water Plume with no 

identified Source 

Other Greater than Zero 

Sum of Values: Greater than Zero 

As described in the HRS Rule Section 2.4.2.2, if the hazardous constituent quantity is not adequately 

determined for one or more sources, assign a factor value as follows. If any target for the ground water 

migration pathway is subject to Level I or II concentrations, assign either the value from Table 2-6 

(Ref. 1, Section 2.4.2.2, Table 2-6), or a value of 100, whichever is greater, as the hazardous waste 

quantity factor value for that pathway. Because the source hazardous waste quantity value is unknown 

but greater than zero, according to Table 2-6, the assigned factor value is 1. Ground water pathway 

targets are subject to actual contamination at Level I concentrations; therefore, the hazardous waste 

quantity factor value is assigned a value of 100 (Ref. 1 Section 2.4.2.2.). This value is entered on line 5 

of HRS Table 3-1. 

Hazardous Waste Quantity Factor Value: 100 

(Ref. 1, Section 2.4.2.2) 

September 2011 35 GW – Waste Characteristics 
September 2011 36 GW – Waste Characteristics 

3.2.3 WASTE CHARACTERISTICS FACTOR CATEGORY VALUE

As specified in the HRS Rule (Ref. 1, Section 3.2.3), the Hazardous Waste Quantity Factor Value of 100 

was multiplied by the highest toxicity/mobility value of 10,000 for TCE, resulting in a product of 

1,000,000 (1 x 106

). Based on this product, a waste characteristics factor value (WCFV) of 32 was 

assigned from Table 2-7 of the HRS Rule (Ref. 1, Section 2.4.3.1). This value is entered on line 6 of 

HRS Table 3-1. 

Toxicity/Mobility Factor Value: 10,000 

Hazardous Waste Quantity Factor Value: 100 

Product = 1,000,000 or 1 x 106

Waste Characteristics Factor Category Value: 32 

(Ref. 1, Table 2-7) 
3.3 TARGETS 

Targets considered include the four factors listed below; nearest well, population, resources and wellhead 

protection area (Ref. 1, Section 3.3). Population considers those residents, students and workers who 

regularly use the water (Ref. 1, Section 3.3.2). As documented below, the population factor is calculated 

differently based on whether the water from the point of withdrawal is subject to actual or potential 

contamination. 

3.3.1 NEAREST WELL 

Well ID: All private wells, except those listed as background wells, presented in section 3.1.1 of this 

documentation record contained TCE at concentrations that exceeded one or more benchmark 

concentrations. These private wells include the following using designators devised by MDNR: MDNR 

176, MDNR 168, MDNR 170, MDNR 102, MDNR 104, MDNR 118, MDNR 121, MDNR 117, MDNR 

114, MDNR 124, MDNR 181, MDNR 251, and EPA sample location 5049-15. The locations of these 

wells are shown on Figure 2 of this documentation record. The locations of the wells sampled by MDNR 

are shown on Figure 5 of the SI/RSE report (Ref. 4, p. 45). 

Level of Contamination (I, II, or potential): Level I 

Thirteen private wells and two public wells meet the criteria for an observed release subject to Level I 

concentrations. Since one or more ground water samples from the private drinking water wells meet the 

criteria for an observed release subject to Level I concentrations, a Nearest well Factor Value of 50 has 

been assigned in accordance with section 3.3.1 of reference 1. This value is entered below and on line 7 

of HRS table 3-1. 

Nearest Well Factor Value: 50 

(Ref. 1, Table 3-11) 

3.3.2 POPULATION

3.3.2.1 Level of Contamination 

The population served by water from a point of withdrawal may be evaluated based on the level of 

contamination for the point of withdrawal (Ref. 1, Section 3.3.2.1). Because previous sampling events 

indicate actual and potential target populations, the following sections detail the respective target values. 

The 4-mile target distance limit (TDL) is shown below as Figure 3. Contaminated private wells sampled 

by MDNR are described in Section 4.2 of the SI/RSE report (Ref. 4, pp 22 – 24) and are shown on Figure 

5 of the report (Ref. 4, p.45). Contaminated private wells are also shown on Figure 2 of this 

documentation record. 

The City of Rogersville municipal water supply utilizes two deep wells that draw exclusively from the 

Ozark aquifer (Refs. 4, p. 22; 20). A map showing the water mains and municipal well locations is 

presented in the SI/RSE report (Ref. 4, p. 44). Outside the city limits, it is apparent that privately owned 

community, non-community and private wells provide water to users (Ref. 4, pp. 22, 23, 41). State 

databases list 13 community and non-community public wells and 557 private wells near the site (Ref. 4, 

p. 23; 8, pp. 9 – 28). Approximately 45 percent of the recorded wells have open boreholes connecting the 

Springfield Plateau and Ozark aquifers (Ref. 4, p. 23; 8 pp. 1, 2). 

September 2011 37 GW – Targets 
Municipal well nos. 1 and 4 were sampled multiple times in 2010 and no TCE was ever reported (Ref. 4, 

pp. 26, 70-73, 100-103, 118-121, 132-133, 144-145, 148-151, 154-157). The Compass Plaza well and the 

well serving the Citizen’s Bank of Rogersville were also sampled multiple times in 2010 (Ref . 4, pp. 26, 

28). These wells provided water to workers and student populations (Ref. 4, pp. 7, 24). 

In March, April and September 2010, 121 private drinking water wells were sampled by MDNR (Ref. 4, 

p. 26). Some of these wells were sampled multiple times. Of the wells sampled, 12 contained 

concentrations of TCE, 1,1,2 TCA or cis-1,2-DCE (Ref. 4, pp. 24, 28, 29, 30). Reported TCE 

concentrations ranged from non-detect to 369 μg/L (Ref. 4, pp. 28-30). In each well with TCE above the 

detection limit, concentrations of TCE exceeded the CRSC of 0.21 μg/L for TCE (Ref. 2, p. 6). In five of 

the wells, concentrations were also above the MCL of 5 μg/L for TCE (Ref. 2, p. 6; 4, pp. 28 – 30). One 

well contained TCE concentrations above the NCRSC of 11 μg/L (Ref. 2, p 6; 4, p. 29). 

EPA Region 7 directed Tetra Tech START to sample the wells at the site in August 2010 in support of a 

removal action (Refs. 13, p. 1; 14). START sampled one well at 9243 East Farm Road 186 that had not 

previously been sampled by MDNR (Ref. 14, p 17). This well contained TCE at 4.4 μg/L, above the 

CRSC of 0.21 μg/L (Ref. 2, p. 6; 15, p. 13). These wells are all the known wells to contain chlorinated 

solvents. Continuing investigations are ongoing to identify and sample new wells. 

3.3.2.2 Level I Concentrations

Populations served by the private wells sampled by MDNR are provided in the SI/RSE report (Ref. 4, 

pp. 23, 24). For the well sampled by EPA with the sample number of 5049-15, population served by the 

well was obtained during a February 22, 2011 sampling event (Refs. 14, p. 17; 19, p. 10). 

The Compass Plaza Well was constructed in 2004 and draws water from the Ozark aquifer (Ref. 4, p. 7). 

In the spring of 2009, the Graceland Daycare connected to the Compass Plaza well which changed the 

wells status from a transient to a non-transient water supply (Ref. 4, p. 7). A non-transient noncommunity well is defined as a public water system that is not a community water system, and that 

regularly serves at least 25 of the same persons over six months per year (Ref. 4, p. 7). This non-transient 

system was assigned a public water system identification number (PWS ID) of MO5292838 (Ref. 4, p. 

62). After TCE was detected in the well, the system was sampled multiple times and on September 29, 

2010, the well was disconnected and connected to city water (Ref. 4, pp. 7, 28, 1555). For the period the 

well was in service, a conservative estimate of 25 persons served is used for scoring (Ref. 4, pp. 7, 24). 

The Citizen’s Bank of Rogersville well is a 545 feet deep, transient non-community well, and draws from 

the Ozark aquifer (Ref. 4, p. 7). Due to its proximity to the Compass Plaza well, the well was sampled by 

the PDWB on March 8 and 16, 2010 and was documented to contain TCE at 2.25 and 2.11 μg/L (Ref. 4, 

pp. 7, 74, 75, 90, 91). Because the well is potentially used by transient populations, only the worker 

population at the Bank will be used in scoring. It is assumed that at least one person may use the well on 

a daily basis. 

September 2011 38 GW – Targets 
Level I Well Codes Aquifer No. Population Reference 

Compass Plaza Well Ozark Aquifer - 2 25 4, pp. 7, 24 

Citizen’s Bank of Rogersville Ozark Aquifer - 2 1 4, pp. 7, 24 

102 Not specified 4 4, p. 24 

114 Not specified 2 4, p. 24 

251 Not specified 2 4, p. 24 

118 Not specified 3 4, p. 24 

176 Not specified 2 4, p. 24 

EPA 5049-15 Not specified 4 14, p. 17; 19, p. 10 

124 Not specified 1 4, p. 24 

104 Not specified 3 4, p. 24 

117 Not specified 3 4, p. 24 

170 Not specified 2 4, p. 24 

181 Not specified 2 4, p. 24 

121 Not specified 2 4, p. 24 

168 Not specified 2 4, p. 24 

Total Level I targets 58 

In total, at least 58 targets are subject to Level I contamination. Because these populations are subject to 

contamination above a health based benchmark, the number of targets in multiplied by 10 as specified in 

Section 3.3.2.2 of the HRS rule (Ref. 1) to produce a Level I concentration factor value of 580. These 

numbers are entered below and on line 8a of HRS Table 3-1. 

Sum of Population Served by Level I Wells: 58 

Sum of Population Served by Level I Wells x 10: 580 

Level I Concentrations Factor Value: 580 

3.3.2.3 Level II Concentrations 

Level II population is not scored as all wells with actual contamination are subject to Level I 

concentrations . 

Level II Concentrations Factor Value: 0 

3.3.2.4 Potential Contamination 

Potential contamination targets for the ground water migration pathway include all domestic and 

municipal ground water wells within 4 miles not subject to actual contamination at Level I or II 

concentrations (Ref. 1, Section 3.3.2.4). Data regarding each of the public and private drinking water 

wells found near the site, together with a figure showing the location of each well is provided in the 

DGLS Hydrogeologic Report (Ref. 8). The DGLS databases contain records of three municipal wells 

(City of Rogersville wells) within 4 miles of the site (Ref. 8, pp. 9, 10; see also Figure 3 of this 

documentation record). Rogersville City Well #2 is only used for monitoring purposes (Ref. 4, p. 22). As 

shown of Figure 3 of this documentation record, the two wells used for production (Wells #1 and #4) are 

located between 1 and 3 miles east northeast of the center of the ground water plume. They are both over 

1,000 feet deep, drawing from the Ozark Aquifer, and are cased completely through the Ozark Confining 

Unit (Refs. 4, p. 22; 20, p. 2). 

 

September 2011 39 GW – Targets 
September 2011 40 GW – Targets 

The most recent Census of Missouri Public Water Systems lists the population served by the City of 

Rogersville’s two public well as 1,500 (Ref. 4, p. 22). Based on communications with the City of 

Rogersville in November 2010, the well system serves 1,100 connections (Ref. 4, p. 1482). According to 

U.S. Census Bureau estimates, the average household size in Rogersville is 2.7 people per household 

(Ref. 32). Based on these reported values, the total population served by the system is 2,970 (1,100 

connections times 2.7 persons per household). A map showing the layout of the water lines in the system 

is provided as Figure 4 of the SI/RSE report (Ref. 4, p. 44). The proportion of the population served by 

each well (based on pumping capacity) is provided in the table below. 

 

CITY OF ROGERSVILLE PUBLIC WELLS SYSTEM SUMMARY 

Total Population. Served (persons) 2,970 

Pumping Capacity Well#1 (gallons per minute) 180 

Pumping Capacity Well#4 (gallons per minute) 350 

Total Pumping Capacity (gallons per minute) 530 

Proportion supplied by Well #1 (percent) 34 

Proportion supplied by Well #4 (percent) 66 

Pop Served by Well #1 (persons) 1,010 

Pop Served by Well #4 (persons) 1,960 

Source: Ref. 4, pp. 22, 23, 1482 

Figure 3 illustrates the 0.25-. 0.50-, 1.0-, 2.0-, 3.0-, and 4.0-mile radius rings measure from the 

approximate center of the ground water plume. Only the municipal wells and the wells that serve the 

three public schools are included in the potential contamination scoring because they serve the greatest 

population. 

Population served by the wells at the schools was estimated based on enrollment reported by the school 

district (Ref. 33). Reference 33 presents the approximate student population and is not believed to 

include staff. As a conservative estimate, only the student population was used in scoring.
September 2011 41 
Distance 

Category 

Municipal and Private Drinking 

Water Wells 

Apportioned 

Population 

(Individuals) References 

Distance-Weighted 

Population Value 

(Ref. 1 Table 3-12) 

0 to 0.25 Not scored Not scored 

0.25 to 0.5 Not scored Not scored 

0.5 to 1 Not scored Not scored 

1 to 2 

Rogersville well 1 1,010 

4, pp. 22, 23, 45, 

1482; 20; 32 294 

2 to 3 Rogersville well 4 

Logan-Rogersville Middle School

Logan-Rogersville High School 

Total Population 2-3 miles 

1,960 

350 

700 

3,010

4, pp. 22, 23, 45, 

1482; 20; 27; 28; 

32, 33 678 

3 to 4 Logan-Rogersville Primary 

School 350 4, p. 45; 29; 33 42 

Total 4,370 1,014 

 

 Sum of Distance-Weighted Population Values: 1,014 

 Sum of Distance-Weighted Population Values/10: 101.4 rounded to 101 

Potential Contamination Factor Value: 101 

3.3.2.5 Calculation of Population Factor Value: 

The total population factor value is the sum of the potential contamination factor (101), the Level I actual 

contamination factor (580), and the Level II actual contamination factor (0)(Ref. 1, Section 3.3.5). The 

total population factor is 681 (580 Level I + 0 Level II + 101 potential). 

3.3.3 RESOURCES 

Ground water use as a resource as defined in Section 3.3.3 of reference 1 has not been evaluated. 

Resources Factor Value: 0 

3.3.4 WELLHEAD PROTECTION AREA 

A designated Wellhead Protection Area for the Rogersville public water supply system has been mapped 

within the 4-mile target distance limit (Ref. 20, p. 1). The maps provided in reference 20 are based on the 

Missouri Source Water Assessment Plan which was developed to implement the requirements of the Safe 

Drinking Water Act Amendments of 1996 for state Source Water Assessment Programs [sections 1453 

and 1428(b)] (Ref. 22, p. 1). In accordance with Section 3.3.4 of reference 1 a value of 5 is assigned and 

entered below and on line 10 of HRS Table 3-1. 

Wellhead Protection Area Factor Value: 5 

September 2011 42 GW – Targets 
September 2011 43 GW – Targets 

3.3.5 CALCULATION OF TARGETS FACTOR CATEGORY VALUE 

The total targets factor category value is the sum of the nearest well, population, resources, and wellhead 

protection area (Ref. 1, Section 3.3.5). The total targets factor category value is 50 (nearest well) + 681 

(population) + 0 (resources) + 5 (wellhead protection area) = 736. This value is entered on line 11 of 

HRS Table 3-1.