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PUBLIC HEALTH ASSESSMENT

DELAVAN MUNI WELL #4
DELAVAN, WALWORTH COUNTY, WISCONSIN



CONCLUSIONS

  • Delavan municipal water is currently safe to drink. Low levels of VOCs were found in water drawn by Delavan municipal wells, from 1983 till 1993, but this contamination did not represent an apparent public health hazard. A treatment system was installed in 1993 and is effective at removing VOCs from water pumped by Wells No. 3 and No. 4.
  • Delavan Well No. 4 is an indeterminate public health hazard because of exposures prior to 1983. Delavan residents were probably exposed to VOC-contaminated groundwater for a number of years before 1982, but there are no data available prior to this date.
  • Contaminated groundwater is not an apparent public health hazard for Delavan area residents who obtain their drinking water from private wells. No Delavan-area households were identified that obtain their drinking water from VOC-contaminated private wells. The wells of three Delavan businesses are contaminated with VOCs, but the levels found in these wells are not a health concern.
  • Groundwater is contaminated in the Delavan area, but the vertical and horizontal extent of groundwater contamination in and around the City of Delavan has not been adequately characterized. The presence of VOCs in groundwater samples from locations around Delavan suggests that contamination may be widely spread. The lack of information about the extent of groundwater contamination in the Delavan area makes it difficult to completely evaluate potential human exposures to contaminated private well water.
  • Ambient air from storm sewer water is an indeterminate public health hazard to Delavan residents who live in the vicinity of the storm sewers. Water in storm sewers serving Sta-Rite contain VOCs, and air within the storm sewers may also contain VOC vapors. Because air sampling was not conducted inside the storm sewer or at access covers where the sewer passes through Delavan, it is not possible to estimate possible human exposures to such ambient air releases.
  • Sediments in the Swan Creek tributary have been tested for VOCs and are not a health concern.
  • Surface water and sediments in the five-acre pond, located immediately south of the Sta-Rite property, have not been tested for contamination. This is a data gap.

RECOMMENDATIONS
  • The geographical limits of contaminated groundwater in the Delavan area should be accurately determined. The vertical and horizontal extent of contaminated groundwater, including that flowing from the Sta-Rite property, should be fully characterized.
  • Until the full extent of groundwater contamination is determined, any existing private wells discovered within and near the City of Delavan should be evaluated or tested for VOC contamination. Any new private wells installed in the Delavan area should also be evaluated or tested for VOC contamination. The City of Delavan should consider well head protection zones for wells that provide water for the municipal water supply system.
  • Ambient air monitoring should be performed inside and around storm sewer access covers to characterize potential releases of VOCs.
  • Surface water and sediments of the five-acre pond, located immediately adjacent and southof the Sta-Rite property, should be tested for contamination.

A. Need For Follow-up Health Activities

The ATSDR Health Activities Recommendations Panel (HARP) and the Wisconsin Division ofHealth evaluated the data on this site to determine what needs exist for additional research and/orlocal education about health related concerns. Such activities could include further studies oncases of disease in the vicinity of the site or providing residents with additional informationabout the health effects of exposures to specific toxic chemicals coming from the site. HARPrecommends ongoing community health education activities to ensure that Delavan arearesidents are aware of groundwater contamination.

B. Public Health Action

The following actions either have been or will be performed to meet the needs expressed by therecommendations of this public health assessment. The Wisconsin Division of Health, incooperation with ATSDR, will:

  1. Continue to consult with the Wisconsin DNR and the U.S. EPA on public health issues that may arise as any action(s) on the site occur;
  2. Provide continuing health education as new information becomes available concerning public health issues related to the site;
  3. Continue to solicit the health concerns of citizens of the City of Delavan, directly or through the Wisconsin DNR, the Walworth County Public Health Nursing Service agency, and through public meetings;
  4. Continue to cooperate with the Wisconsin DNR and Walworth County Public Health Nursing Service agency to address environmental health and public health issues that pertain to the site and the community;
  5. Offer professional education opportunities about the site to practicing health careproviders in the City of Delavan and nearby areas.

TABLES

Table 1.

Municipal Well Contamination Selected Samples: 1982 to 1985 City of Delavan, Wisconsin All Concentrations in Micrograms per Liter (µg/L)

WELL DESIGNATION
AND
CHEMICALS DETECTED
MAR
1982
SEP
1982
DEC
1982
MAR
1983
JUN
1983
AUG
1983
DEC
1983
MAR
1984
JUN
1984
SEP
1984
NOV
1984
MAR
1985
Comparison
Value
(µg/L)

WELL No. 3
Tetrachloroethylene (PCE)NT-----------0.2a
Trichloroethylene (TCE)NT---11*230*5*--15*18*23.2a
WELL No. 4
Tetrachloroethylene (PCE)16*NT37*15*22*39*28*-----0.2a
Trichloroethylene (TCE)130*130*165*270*150*1,300*120*27*17*40*16*33.2a

* Exceeds or matches Comparison Value.
- Not Detected.
NT Sample Not Taken/Chemical Not Tested in Sample
a. Oral CREG (Cancer Risk Evaluation Guideline) for 1x10-6 excess lifetime cancer risk.


Table 2.

Municipal Well Contamination - 1982 to 1991 City of Delavan, Wisconsin All Values in Micrograms per Liter (µg/L)

YEAR TESTED &CONTAMINANT DETECTEDWELL NO. 4WELL NO. 3Comparison
Valuea
(µg/L)
Lowest
Level
Detected
Highest
Level
Detected
Frequency
of
Detection
Lowest
Level
Detected
Highest
Level
Detected
Frequency
of
Detection
 

1982
Tetrachloroethylene12*37*6/6 --0/1 0.2
Trichloroethylene60*170*9/9 --0/3 3.2
1983
Tetrachloroethylene9*96*41/54 --0/35 0.2
Trichloroethylene13*1,300*54/55 1230*22/35 3.2
1984
Tetrachloroethylene2*24*5/10 --0/8 0.2
Trichloroethylene7*40*14/145*18*5/123.2
1985
TetrachloroethyleneNTNT0.2
Trichloroethylene322*11/13220*5/113.2
1986
Tetrachloroethylene-13*1/1NT0.2
Trichloroethylene4*7*2/6-8*1/73.2
1987
TetrachloroethyleneNTNT0.2
Trichloroethylene117*11/204*16*2/163.2
1988
Tetrachloroethylene1*4*13/41--0/100.2
Trichloroethylene19*44/49124/113.2
1989
Tetrachloroethylene1*2*27/54--0/130.2
Trichloroethylene15*47/541212/153.2
1990
Tetrachloroethylene1*1*4/17--0/20.2
Trichloroethylene14*20/41127/83.2
1991
TetrachloroethyleneNTNT0.2
Trichloroethylene17*64/6524*9/103.2

* Matches or Exceeds Comparison Value.
NT: Contaminant Not Tested for in Collected Sample(s).
a. Oral CREG (Cancer Risk Evaluation Guideline) for 1x10-6 excess lifetime cancer risk.
Source: Simon Hydro-Search, Technical Memorandum/Report Appendix J.1. Volume II. Remedial Investigation/FeasibilityStudy. Prepared for Sta-Rite Industries, Inc. Brookfield, Wisconsin: Simon Hydro-Search. July 17, 1992.


Table 3.

VOC Contamination in Soil Borings from Sta-Rite Industries, Inc. Adjacent to Delavan Well No. 4 Delavan, Wisconsin August 1991 through April 1992 All Concentrations in µg/kg

CHEMICALMinimum
Detected
(µg/kg)
Maximum
Detected
(µg/kg)
Frequency
of
Detection

Tetrachloroethylene (PCE)2>50,00015/28
Trichloroethylene (TCE)1>8,20026/28

Source: Simon Hydro-Search. Technical Memorandum #1 - SourceCharacterization. Prepared for Sta-Rite Industries, Inc. Contract SF-90-02. Tables 4-4 & 4-11. Brookfield,Wisconsin: Simon Hydro-Search. October 29, 1992.


TABLE 4: Groundwater Contamination
on Property of Sta-Rite Industries, Inc.
Adjacent to Delavan Well No. 4
Delavan, Wisconsin
October 1991 through January 1992
All Concentrations in µg/L

Table 3.

Potential Exposure Pathways Table

CHEMICALMONITORING WELLSEXTRACTION WELLSComparison
Valuea
(µg/L)
Minimum
Detected
(µg/L)
Maximum
Detected
(µg/L)
Frequency
of
Detection
Minimum
Detected
(µg/L)
Maximum
Detected
(µg/L)
Frequency
of
Detection

Tetrachloroethylene (PCE)1*32*10/248*44*2/90.2
Trichloroethylene (TCE)11,700*18/241500*8/93.2

* Exceeds Comparison Value
a. Oral CREG (Cancer Risk Evaluation Guideline) for 1x10-6 excess lifetime cancer risk.
Source: Simon Hydro-Search, Technical Memorandum #4 - Contaminant Extent Characterization. Tables 4-4and 4-9. Prepared for Sta-Rite Industries, Inc. Contract SF-90-02. Brookfield, Wisconsin: SimonHydro-Search. January 18, 1993.


Table 5.

Groundwater Extraction Well ContaminantsSta-Rite Industries
1984 to 1991 City of Delavan, Wisconsin All Values in Micrograms per Liter (µg/L)

STA-RITE
EXTRACTION
WELL
Lowest
Level
Detected
Highest
Level
Detected
Frequency
of
Detection

WELL NO. 1
Tetrachloroethylene667011/33
Trichloroethylene115,80032/33
WELL NO. 2
Tetrachloroethylene-101/32
Trichloroethylene1203,48011/32
WELL NO. 3
Tetrachloroethylene--0/32
Trichloroethylene109,40014/32
WELL NO. 4
Tetrachloroethylene--0/32
Trichloroethylene59,20011/32
WELL NO. 5
Tetrachloroethylene--0/12
Trichloroethylene-211/12
WELL NO. 6
Tetrachloroethylene--0/12
Trichloroethylene-1301/12
WELL NO. 7
Tetrachloroethylene3379010/22
Trichloroethylene3621,02921/22

Source: Simon Hydro-Search. Technical Memorandum/Report Appendices, RemedialInvestigation/Feasibility Study. Table 4-4, Appendix J.2, Monitoring Well WaterQuality Data. Prepared for Sta-Rite Industries, Inc. Contract SF-90-02. Brookfield, Wisconsin: Simon Hydro-Search. July 17, 1992.


Table 6.

Groundwater Contamination D-5 & D-6 Monitoring Well Cluster City of Delavan, Wisconsin All Concentrations in Micrograms per Liter (µg/L)

CHEMICALWELL D-5WELL D-6Comparison
Valuea
µg/L)
198319841991198319841991

Tetrachloroethylene (PCE)10*-----0.2
Trichloroethylene (TCE)588*670*8*4*6*-3.2

* Exceeds or matches Comparison Value.
- Not Detected.
†Well D-5 is draws water from a depth of 30-50 feet and D-6 is draws water from a depth of 100-110 feet.
a. Oral CREG (Cancer Risk Evaluation Guideline) for 1x10-6 excess lifetime cancer risk.
Source: Simon Hydro-Search, Technical Memorandum/Report Appendices. AppendixJ.2, Volumes II. Remedial Investigation/Feasibility Study. Prepared for Sta-RiteIndustries, Inc. Brookfield, Wisconsin: Simon Hydro-Search. July 17, 1992.


Table 7.

Trichloroethylene Concentrations Simultaneous Water Samples - 1982 to 1991 Sta-Rite Extraction Wells & Municipal Storm Sewers City of Delavan, Wisconsin All Concentrations in Micrograms per Liter (µg/L)

WELL/SAMPLE
DESIGNATION
NOV
1982
NOV
1984
DEC
1984
SEP
1985
APR
1986
SEP
1986
JUN
1988
NOV
1988
JUN
1989
MAR
1990
SEP
1990
NOV
1991
DEC
1991

Extraction Well 1n/a4,7002,9005801101403527311526142015
Extraction Well 2n/a3,48001,0000620320-13100210268
Extraction Well 3n/a2,300021001405715247001410
Extraction Well 4n/a1700470269-9-201
Extraction Well 5n/a21190----90--01
Extraction Well 6n/a-------0--00
Extraction Well 7n/an/an/a900-3,3002,4005,31068510852350241
Outfall 0015,000---16192--1-13
SS-1--------39222121-
SS-2-8212022010038241492055

- Sample Not Collected
n/a Sample not available: Well not constructed.


Table 8.

Trichloroethylene Concentrations - 1991 & 1992Municipal Wells and Water Supply Distribution Points City of Delavan, Wisconsin All values in Micrograms per Liter (µg/L)

Sampling
Date
Well No. 3Well No. 4825 E.
Geneva
1441 E.
Wisconsin

7/01/913422
8/12/912311
9/09/91-2--
12/16/914444
11/11/914333
10/07/914423
1/20/924223
3/09/9233--

- Trichloroethylene not detected in sample.
† Water pumped from well not used by Delavan water supply system.
Source: Gabriel - Midwest, Ltd., laboratory reports submitted to the City of Delavan.


PREPARERS OF REPORT

Henry Nehls-Lowe, MPH
Epidemiologist
Health Hazard Evaluation Unit
Bureau of Public Health
Division of Health
Wisconsin Department of Health & Family Services

ATSDR Senior Regional Representative

Louise Fabinski
Regional Services
Region V
Office of the Assistant Administrator

SELECTED REFERENCES
  1. ATSDR (Agency for Toxic Substances and Disease Registry, Public Health Service, U.S.Department of Health & Human Services). Preliminary Public Health Assessmentfor Delavan Municipal Well No. 4. Prepared for ATSDR by the Division of Health,Wisconsin Department of Health & Social Services. Atlanta, Georgia: ATSDR,May 25, 1989.

  2. ATSDR. Toxicological Profile for Trichloroethylene. TP-92/19. Atlanta, Georgia:ATSDR. April 1993.

  3. ATSDR. Toxicological Profile for Tetrachloroethylene. TP-92/18. Atlanta, Georgia:ATSDR. April 1993.

  4. ATSDR. Decision Statements for Reviewing Health Assessments. Review and CommentDraft. Atlanta, Georgia: ATSDR. October 21, 1991.

  5. ATSDR. Public Health Assessment Guidance Manual. NTIS order no. PB92-147164. Atlanta, Georgia: ATSDR. March 1992.

  6. ATSDR, Division of Health Studies. National Exposure Registry: TrichloroethyleneSubregistry, Baseline Technical Report. Atlanta, Georgia: ATSDR. May 1993.

  7. ATSDR. Site Review and Update for Delavan Well No. 4, Delavan, Walworth County,Wisconsin. Atlanta, Georgia: ATSDR. September 30, 1993.

  8. BT2, Inc. Phase II Investigation Report, Delavan Mobil (338 E. Walworth Avenue),Delavan, Wisconsin. Madison, Wisconsin: BT2. April 1992.

  9. CACI Marketing Systems, Inc. The Sourcebook of Demographics and Buying Power forEvery ZIP Code in the USA. Sixth Edition, Second Printing. Fairfax, Virginia:CACI, 1989.

  10. CACI Marketing Systems, Inc. The Sourcebook of ZIP Code Demographics, 1990 CensusEdition - Volume One. Fairfax, Virginia: CACI, 1991.

  11. City of Delavan, Director of Public Works. Correspondence to Southeast District DNROffice listing potential sources of contamination in Well No. 4. December 22, 1982.

  12. City of Delavan, Director of Public Works. Correspondence to Sta-Rite reporting resultsof 6/8/83 well water testing. June 17, 1983.

  13. City of Delavan, Director of Public Works. Response to University of Wisconsin -Milwaukee survey of municipal water supply contamination. Survey completed byGeorge Anderson, Superintendent of the Delavan Water-Sewer Department. March 20, 1986.

  14. Crispell-Snyder, Inc. Correspondence to DNR. December 28, 1989.

  15. Crispell-Snyder, Inc. Well No. 4 Contamination Analysis Report, Delavan, Wisconsin. Elkhorn, Wisconsin: Crispell-Snyder, April 1990.

  16. Dawson B, Johnson PD, Goldberg SJ, and Ulreich JB. Cardiac Teratogenesis ofTrichlorethylene and Dichloroethylene in a Mammalian Model. J Am Coll Cardiol. 16:1304-1309, 1990.

  17. Department of Development. County Economic Profile for Walworth County. Madison,Wisconsin: DOD. August 1992.

  18. DOH (Wisconsin Division of Health, Wisconsin Department of Health and SocialServices). File Memorandum of Site Visit on April 13, 1993. April 14, 1993.

  19. DOH. File Memorandum of Telephone Conversation with Sally Sarnstrom, Departmentof Public Instruction. April 14, 1993.

  20. DOH. File Memorandum of Telephone Conversation with Robert Schutt, Director ofUtilities, City of Delavan. October 28, 1993.

  21. DOH. File Memorandum of Telephone Conversation relating to construction Highway 43. November 23, 1993

  22. DOH. Correspondence to the City of Delavan, regarding contamination of a spring. May 1, 1995.

  23. DOH. Correspondence to Homeowner of 6442 State Highway 11, Delavan, Wisconsin. August 21, 1995.

  24. DNR (Wisconsin Department of Natural Resources). "Synthetic Chemicals Found in 51Community Water Supplies", press release issued on December 2, 1982.

  25. DNR. Correspondence to Ten Delavan Businesses in the vicinity of Well No. 4, fromSoutheast DNR District Office. February 15, 1983.

  26. DNR. Internal Memorandum from J. Krahling to K. Satyshur, Water Supply - SoutheastDistrict Office. July 20. 1983.

  27. DNR. Correspondence to Sta-Rite Industries in response to Donohue GroundwaterModeling report of December 1983. March 9, 1984.

  28. DNR. Report on an Investigation of the Public Water Supply at Delavan, Wisconsin. Central DNR Office, Bureau of Water Supply. Madison, Wisconsin: DNR. December 28, 1988.

  29. DNR. Correspondence from Nancy Gloe to Lyle Smith, City of Delavan (Appendix B:Crispell-Snyder report of April, 1990) approving temporary Groundwater Dischargepermit. November 24, 1989.

  30. DNR. Correspondence from L. Boushon to City of Delavan in response to Crispell-Snyder report of April, 1990. May 14, 1990.

  31. DNR. Wisconsin Pollutant Discharge Elimination System permit for Sta-Rite Industries,Delavan, Wisconsin. Permit No. WI-0055816-3. October 3, 1990.

  32. DNR. Correspondence to Sta-Rite Industries on review of the Site Evaluation Report. October 20, 1990

  33. DNR. Delavan Well No. 4: Superfund Site Community Relations Plan. Madison, WI:Wisconsin Department of Natural Resources. July 22, 1991.

  34. DNR. Internal memorandum to file reporting May 5, 1992, site visit of Pam Mylotta toMobil Oil Bulk Plant on Ann Street, Delavan, Wisconsin. May 6, 1992.

  35. DNR. Correspondence to Henry Nehls-Lowe, from Peter Wood, regarding a private wellassessment of the City of Delavan, Wisconsin. May 4, 1994.

  36. DNR. Correspondence to Henry Nehls-Lowe, from Pam Mylotta, regardingEnvironmental Repair Projects in Delavan, Wisconsin. July 15, 1994.

  37. DNR. Correspondence to Henry Nehls-Lowe, from Gina Keenan, regarding LeakingUnderground Storage Tank sites in Delavan, Wisconsin. July 26, 1994.

  38. DNR. Correspondence to private homeowner of N4197 County Trunk Highway P,Delavan, Wisconsin, from Barbara Wolf, Water Supply Specialist, Southeast DistrictDNR Office. July 8, 1994.

  39. DNR. Correspondence to private homeowners on Comus Drive, Delavan, Wisconsin,from Sharon Schaver, Hydrogeologist, Southeast District DNR Office. August 30, 1994.

  40. Donohue (Donohue & Associates, Inc.). Investigation of Solvent Contamination in City ofDelavan, Wisconsin, Well No. 4. Prepared for Sta-Rite Industries. Sheboygan,Wisconsin: Donohue. May 1983.

  41. Donohue. Groundwater Modeling of Solvent Contamination Near City of Delavan WellNo. 4. Prepared for Sta-Rite Industries. Sheboygan, Wisconsin: Donohue,December 1983.

  42. Donohue. Remedial Action at Plant 2 Sump, Sta-Rite Industries, Delavan Operations. Prepared for Sta-Rite Industries, Delavan, Wisconsin. Sheboygan, Wisconsin: Donohue. January 1984.

  43. Donohue. Groundwater Monitoring and Remedial Action-Interim Report to DNR: Sta-Rite Industries Water Equipment Division, Delavan, Wisconsin. Sheboygan,Wisconsin: Donohue. April 1984.

  44. Donohue. Additional Site Investigations and Remedial Action Recommendations: Sta-Rite Industries Water Equipment Division, Delavan, Wisconsin. Sheboygan,Wisconsin: Donohue. June 1984.

  45. Enviro-Analysts, Inc. Correspondence to Sta-Rite Industries reporting the results ofsanitary and stormwater discharge monitoring. December 15, 1982.

  46. EPA (U.S. Environmental Protection Agency). Aerial Photographic Analysis of NinePriority CERCLA Hazardous Waste Sites. Southern Wisconsin. EPA Region 5. Prepared by Lockheed Environmental Programs. Contract No. 68-03-3245. LasVegas, Nevada: EPA. May 1985.

  47. EPA. National Priorities List Sites: Wisconsin. EPA/540/4-90/049. September 1990.

  48. Foth & Van Dyke, and Associates, Inc. Baseline Risk Assessment Plan: City of DelavanSuperfund Project. Prepared for the Wisconsin Department of Natural Resources. Green Bay, Wisconsin: Foth & Van Dyke. October 1991.

  49. Goldberg SJ, Lebowitz MD, Graver EJ, and Hicks S. An Association of human congenitalcardiac malformations and drinking water contaminants. J Am Coll Cardiol. 16:155-164, 1990.

  50. Graef, Anhalt, Schloemer & Associates, Inc. Tank Removal Assessment of Campbell'sMobil, 746 East Geneva Street, Delavan, Wisconsin. Prepared for CambeckPetroleum Corporation. Project 928019. Milwaukee, Wisconsin: Graef, Anhalt,Schloemer & Associates. February 1993.

  51. Hydro-Search, Inc. Correspondence from J. Johanson to T. Wentland, Wisconsin DNR. Second Quarter Progress Report for Source Area Remediation at the Sta-RiteFacility in Delavan, Wisconsin. April 12, 1995

  52. Janesville Gazette. "Well Contamination Worsens in Delavan". August 12, 1982.

  53. Layne GeoSciences, Inc. Site Investigation Report for Country Ford Lincoln-Mercury,Delavan Wisconsin. Prepared for Country Ford Lincoln-Mercury and WisconsinDepartment of Natural Resources. Project No. 61.2460. Pewaukee, Wisconsin:LGI. October 1991.

  54. Simon Hydro-Search, Inc. Pumping Tests and Hydraulic Analysis Report for DelavanCity Well #4. Prepared for Sta-Rite Industries, Inc. Project No. 351E12113. Brookfield, Wisconsin: Simon Hydro-Search. February 2, 1990.

  55. Simon Hydro-Search. Pumping Test and Hydraulic Analysis Report, City Well #4,Delavan, Wisconsin. Prepared for Sta-Rite Industries, Inc. Project No. 351E12113. Brookfield, Wisconsin: Simon Hydro-Search. February 15, 1990.

  56. Simon Hydro-Search. Task 1 - Site Evaluation Report, Remedial Investigation/FeasibilityStudy. Prepared for Sta-Rite Industries, Inc. Project No. 350115013. Brookfield,Wisconsin: Simon Hydro-Search. October 25, 1990.

  57. Simon Hydro-Search. Task 2 - Project Work Plans, Remedial Investigation/FeasibilityStudy. Prepared for Sta-Rite Industries, Inc. Project No. 350115013. Brookfield,Wisconsin: Simon Hydro-Search. February 13, 1991.

  58. Simon Hydro-Search. Technical Memorandum/Report Appendices. Volumes I & II. Remedial Investigation/Feasibility Study. Prepared for Sta-Rite Industries, Inc. Contract SF-90-02. Brookfield, Wisconsin: Simon Hydro-Search. July 17, 1992.

  59. Simon Hydro-Search. Technical Memorandum #2 - Migration Pathway Assessment,Remedial Investigation/Feasibility Study. Prepared for Sta-Rite Industries, Inc. Contract SF-90-02. Brookfield, Wisconsin: Simon Hydro-Search. July 17, 1992.

  60. Simon Hydro-Search. Technical Memorandum #3 - Baseline Risk Assessment DataSummary. Prepared for Sta-Rite Industries, Inc. Project No. 350115013. Brookfield, Wisconsin: Simon Hydro-Search. July 17, 1992.

  61. Simon Hydro-Search. Technical Memorandum #1 - Source Characterization. Preparedfor Sta-Rite Industries, Inc. Contract SF-90-02. Brookfield, Wisconsin: SimonHydro-Search. October 29, 1992.

  62. Simon Hydro-Search. City of Delavan Well No. 3; Alternative TCE Sources. Correspondence to Colin Beverage, Sta-Rite Industries, Delavan, Wisconsin. November 3, 1992.

  63. Simon Hydro-Search. Technical Memorandum #4 - Contaminant Extent Characterization. Prepared for Sta-Rite Industries, Inc. Contract SF-90-02. Brookfield, Wisconsin:Simon Hydro-Search. January 18, 1993.

  64. Simon Hydro-Search.  Remedial Investigation of the Sta-Rite Industries Site, Delavan,Wisconsin. Prepared for Sta-Rite Industries, Inc. Project No. 350115013. Brookfield, Wisconsin: Simon Hydro-Search. March 12, 1993.

  65. Simon Hydro-Search. Remedial Design / Remedial Action Project Plans, InterimRemedial Measure, Sta-Rite Industries, Inc. Prepared for Sta-Rite Industries, Inc.,of Delavan, Wisconsin. Project No. 350115013. Brookfield, Wisconsin: SimonHydro-Search. March 18, 1993.

  66. Sta-Rite Industries, Inc. Investigation of Trichloroethylene Contamination Problem, CityWell #4. Correspondence from LaChapell to DNR. January 11, 1983.

  67. Sta-Rite Industries, Inc. Correspondence from D. LaChapell to City of Delavansummarizing investigations and remediation. October 10, 1985.

  68. STS Consultants Ltd. Remedial Investigation Report, Holiday Service Station, Delavan,Wisconsin. Prepared for Holiday Company, Minneapolis, Minnesota. Project83481XG. Milwaukee, Wisconsin: STS Consultants. August 8, 1991.

  69. STS Consultants Ltd. Application to Wisconsin DNR to Treat or Dispose of PetroleumContaminated Soil for LUST Remediation Site Owned by Holiday Service Station inDelavan Wisconsin. February 14, 1992.

  70. Warzyn Engineering, Inc. Correspondence to City of Delavan reporting results of soil andwater testing in the vicinity of well No. 4. February 16, 1983.

  71. Warzyn Engineering, Inc. Correspondence to City of Delavan in response to DonohueGroundwater Modeling report of December 1983. March 1, 1983.

  72. Warzyn Engineering, Inc. Summary of Reinstallation of Remedial System and SoilsInvestigation - Ann Street Bulk Plant, Delavan, Wisconsin. Prepared for MobilCorporation, Schaumburg, Illinois. Report 12837. Madison, Wisconsin: Warzyn, April 1987.

  73. Warzyn Engineering, Inc. Results of Aquifer Testing: Former Mobil Oil Bulk Plant, BP#98-216, Delavan, Wisconsin. Madison, Wisconsin: Warzyn, September 1989.

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