Seaton facility number 1310350 well site survey report

42 Pages·1991·4.8 MB·English

1553.79
Illinois Division of Public Water Supplies
SEAT
Environmental 2200 Churchill Road
c. 3 Protection Agency Springfield, Illinois 62706
Groundwater Quality
Protection Program
SEATON
FACILITY NUMBER 1310350
WELL SITE SURVEY REPORT
Division of Public Water Supplies
ILLINOIS DOCUMENTS
JUL 16 1991
ILLINOIS STATE LIBRARY
i '
IEPA/PWS/91-72
GROUNDWATER QUALITY PROTECTION PROGRAM:
SEATON
FACILITY NUMBER 1310350
WELL SITE SURVEY REPORT
Presented by:
Division of Public Water Supplies
Published by:
Illinois Environmental Protection Agency
Springfield, Illinois
April, 1991
ILLINOIS STATE LIBRARY
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3 TABLE OF CONTENTS
T. Introduction
II. Facility Description and Geologic Profile of Well Sites
III. Groundwater Sampling and Monitoring History
IV. Well Site Survey Methods and Procedures
V. Summary
VI. Recommendations
VII. Technical Appendices
A. Topographic Map Displaying Seaton's Well Locations
B. Aerial Photographic Map
1. Seaton Well #1 (31837) Summary Description and Unit Inventory
2. Seaton Well #2 (31838) Summary Description and Unit Inventory
C. Facility Wells Report
D. Detailed Sampling and Monitoring History
E. Hazard Review Worksheet
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INTRODUCTION
This report has been prepared by the Agency pursuant to Section 17.1 of the Illinois
Environmental Protection Act. The report summarizes information about your facility and
samples collected and analyzed from your well(s). The well site survey provides an
inventory of the area around the well(s) to help increase your awareness of potential
hazards to groundwater utilized by your facility. This information and technical data
will assist you in developing and implementing local groundwater protection measures
authorized by the Act.
FACILITY DESCRIPTION AND GEOLOGIC PROFILE OF WELL SITES
The Seaton PWS utilizes two public water supply wells. These wells provide
approximately 25,000 gpd to 114 service connections (roughly 200 individuals). Well #1
is located in the central portion of town north of Third street Well #2 is located at
the east edge of town south of Third Street.
The wells produce water from bedrock aquifers. These aquifers are overlain by materials
with moderate permeability. Permeability is the ability of a soil or sediment to
transmit fluids. A detailed description and geologic profile is found in the Facility
Wells Report (Appendix C). Table I describes the wells as follows:
__Table I _
Minimum Maximum Capacity Specific Well Well
Setback Setback (gpm) Capacity Depth Logs
(Ft.) (Ft.) Status (MGD) (gpm/ft) Treatment Aquifer (Ft.) Available
Well #1 400 No I,SB 25 Bedrock 244
(31837)
Well #2 200 No A 80 Cl, Aer Bedrock 364
—
(31838) 0.100
A = Active
GROUNDWATER SAMPLING AND MONITORING HISTORY
Vfells #1 and #2 were sanpled on August 19, 1986 as part of a Statewide Groundwater
Monitoring Program. At this time, they were sampled and analyzed for inorganic
chemicals (IOC) and volatile organic/aromatic (VOCAOA) compounds.
VOCAOA analysis on Well #1 did not detect quantifiable levels of volatile organic or
aromatic compounds. VOC/VOA analysis on Well #2 detected trace amounts of 1,3,1
trichloroethane; follow-up monitoring has not confirmed the presence of this
contaminant. Inorganic analysis indicated parameters to be consistent with similar
bedrock aquifer wells in the State of Illinois. (For detailed sampling and monitoring
results refer to Appendix D.)
SURVEY METHODS AND PROCEDURES
The detailed well site survey consists of an aerial photographic map and inventory
sheets (Appendix B), that relate information about potential sources, routes and
possible problem sites to your water supply well(s). The location of potential sources,
routes, possible problem sites, water wells, minimum setback zones, and the 1,000'
survey area are all displayed on the aerial photographic map.
The first fage of each survey consists of a summary description and geologic profile for
each well. The secx)nd and following pages of the survey inventory units within and
bordering a 1,000' radius of the wellhead. A unit is defined as any device, mechanism,
equipment, or area (exclusive of land utilized only for agricultural production). The
Agency five-digit well number is associated with a unit or map code, and then
classified. The classification codes relate to definitions of potential contamination
sources and routes as defined in the Illinois Groundwater Protection Act (see
Groundwater Primer pages 18-19). The distance and direction of the unit from the
wellhead is also indicated.
Survey Results and Findings:
The Seaton well site field survey was conducted on November 30, 1989 by Dave McMillan
from the Agency's Peoria Regional Office.
Seaton Well #1 (31837) (Refer to Aerial Photograph B):
The survey area was urban. The area is mostly low density residences. The residents of
this municipality utilize single dwelling sewage disposal systems. One potential
secondary source of groundwater contamination was observed 200' south of the wellhead.
This unit was a gas station with belowground fuel storage in excess of 500 gallons. Map
Code 03. In addition, two possible problem sites were observed within 1,000' of the
wellhead. Map Code 04 indicates a machine shop 100' southeast of the well. Map Code 02
indicates an abandoned bulk fuel storage area located 800'. southwest of the well.
Seaton Well #2 (31838) (Refer to Aerial Photograph B):
The survey area was urban. The area was mostly low density residences. The residents
of this municipality utilize single dwelling sewage disposal systems. No possible
problem sites were observed at the time of the survey.
SUMMARY
The well site survey and monitoring indicated that there was one potential secondary
source of groundwater contamination and two possible problem sites within 1000' of the
Seaton Public Water Supply Wells. Trace amounts of VOC's were detected in Well #2,
while inorganic analysis were consistent with what would be expected from similar
bedrock aquifer wells in the State.
The Illinois Environmental Protection Act provides minimum protection zones for your
wells. These minimum protection zones are regulated by the lEPA. The Act also
authorizes county and municipal officials the opportunity to provide maximum protection
zones up to 1,000'. The responsibility for the control would then be assumed by local
officials through adoption of a maximum setback zone ordinance.
RE(30MMENDATI0NS
The Agency strongly urges Seaton to consider establishing a maximum setback zone
ordinance for its wells. Maximum setback zones prohibit the siting of new potential
primary sources of groundwater contamination. In addition, it could expand regulatory
coverage of certain existing and new activities associated with your wells. The
controls could be implemented upon adoption of proposed regulation by the Illinois
Pollution Control Board
A "Maximum Setback Zone Workbook" has been prepared by the Agency which provides
detailed case studies of how to establish maximum setback zones. Additional technical
assistance is available from the lEPA and the Illinois State Water Survey.
DM/lc
0173P
TECHNICAL APPENDICES
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