Airport Water Compliance Inspection Report
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STATE OF IO'NA
THOMAS J. VI LSACK, GOVERNOR
SALLYJ. PEDERSON, LT. GOVERNOR
DEPARTMENT OF NATURAL RESOURCES
JEFFREY R. VONK, DIRECTOR
CERTIFIED MAIL
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February 28, 2005
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City of Dubuque
50 W 13th St.
Dubuque, IA 52001
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Attention: Honorable Mayor and Council
RE: Water Compliance Inspection - Dubuque Regional Airport
Notice of Violation 567 lAC 43.2(2) Operating permit requirements
System No. IA3126013
We have enclosed the inspection report prepared by Chad Kehrli of our Field Office Staff.
All requirements are to be completed as specified in the report. We encourage you to consider
the recommendations.
If you have about the report, please contact Chad Kehrli or myself at this Field Office.
Sincerely,
ENVIRONMENTAL PROTECTION DIVISION
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Mike Wade
Environmental Specialist
c: File - WS/Dubuque County/Dubuque Airport
Water Supply Section - DNR - Des Moines
Environmental Lab, 795 Julien Dubuque Drive, Dubuque, IA 52001
Todd Dalsing, Dubuque Regional Airport, 11000 Airport Road, Dubuque, IA 52001
Efile - 31 WS Dubuque 3126013 Dubuque Airport 020805 cov cek
Field Office 1, 909 West Main Suite 4, Manchester, IA 52057
563/927-2640 FAX 563/927-2075
Field Office 1, 909 West Main Suite 4, Manchester, IA 52057
563/927 -2640 FAX 563/927-2075
IOWA DEPARTMENT OF NATURAL RESOURCES
WATER SUPPLY SANITARY SURVEY
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PLANT GRADE:
A
Pa e 1 of 5
SERVICE TYPE:
NTNC
CITY:
Dubuque
STATE:
Iowa
ZIP:
52001
PHONE:
563/589-4128
SURVEY
DATE THIS SURVEY:
02108/2005
DATE LAST SURVEY:
11/08/1999
PURPOSE:
General Com
CERTIFICATION #:
RESPONSIBLE
OPERATOR
NAME:
Mark Smith
GRADE:
PERSONS NAME: TITLE:
INTERVIEWED Todd Dalsing Airport Operations & Maintenance Supervisor
Mark Smith Operator
CONSUMPTION
Average GPD:
3,500 est.
Maximum GPD:
5,000 est.
POPULATION:
420
PE @ 100 GPCD
ASSESSMENTS
VULNERABILITY:
D On File [8] U date Attached
INFLUENCED GROUNDWATER:
D On File [8] U date Attached
AUTHENTI- INS;~T~: ~~a9 Kehrli
CATION l t......t/ / e/I..A
DATE
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DATE
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Were deficiencies noted or significant observations made during this inspection?
Yes - See Comments Section, No - no deficiencies noted, Blank - not applicable or observed
Yes No Item Yes No Item
1. SOURCE 6. DISTRIBUTION SYSTEM
~ 0 a. Location & Vulnerability Assessment ~ 0 a. Sanitation & Construction
~ 0 b. Sanitation & Construction 0 ~ b. Operation & Maintenance
0 ~ c. Operation & Maintenance 0 ~ c. Flow Capacity & System Pressure
0 ~ d. Capacity 0 0 d. Asbestos Piping
~ 0 e. SWTR/SW, GW, IGW Assessment 7. BACTERIOLOGICAL MONITORING
2. TREATMENT ~ 0 a. Sampling Plan Compliance
0 0 a. Location ~ 0 b. Bacterial Quality
~ 0 b. Sanitation & Construction ~ 0 c. Disinfectant Residual
~ 0 c. Operation & Maintenance 0 ~ d. Sanitary Hazard
0 0 d. Capacity 8. CHEMICAL QUALITY
3. PLANT STORAGE 0 ~ a. Raw Water Sources
0 0 a. Location 0 ~ b. Finished Water
0 0 b. Sanitation & Construction 9. OPERATION
0 0 c. Operation & Maintenance 0 ~ a. Test Equipment
0 0 d. Capacity ~ 0 b. Operation Reports
4. DISTRIBUTION STORAGE 10. STAFFING & OPERATOR CERTIFICATION
0 ~ a. Location ~ 0 a. Operator, Direct Responsibility
0 ~ b. Sanitation & Construction 0 0 b. Shift Operators
0 ~ c. Operation & Maintenance 0 0 c. General Staffing
0 ~ d. Capacity 11. MISCELLANEOUS
5. PUMPING STATION 0 ~ a. Permits
0 0 a. Location ~ 0 b. Source/Entry Point
0 0 b. Sanitation & Construction 0 0 c. Emergency Operation
0 0 c. Operation & Maintenance 0 0 d. Lead & Copper
0 0 d. Capacity 0 0 e. Previously Noted Deficiencies
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Water Supply Sanitary Survey
Dubuque Regional Airport
Page 2 of 5
SYSTEM DESCRIPTION
Water for this nontransient public water supply is provided by two deep wells. Well #1, active well, was
constructed in 1948 to a depth of 720 feet. This well was cased to a depth of 361 feet. Well #1 is
equipped with a submersible pump capable of providing water at a rate of 100 GPM. A 3,000-gallon
pressure tank provides pressure and storage for the distribution system. Water from this well is treated
with liquid chlorine for disinfection.
Well #2, emergency well, was constructed in 1996 to a depth of 800 feet and cased to a depth of 400
feet. Well #2 is equipped with a submersible pump capable of providing water at a rate of 150 GPM. A
1,500-gallon pressure tank can provide pressure and storage for this distribution system. Water from this
source is not treated. Presently this well is only used to supply water for fire protection services at the
airport.
SYSTEM EVALUATION
1.a. Source (Location and Vulnerability Assessment)
A public water supply is classified as "vulnerable" if one or more of the following conditions exist:
. Synthetic organic compounds (SOCs) or volatile organic compounds (VOCs) that were detected by
any previous monitoring will be classified "vulnerable" for a period of three years, excluding total
trihalomethanes (TTHM) or other demonstrated disinfection by-products.
. Public water supply wells that are within any of the following separation distances:
Sources of contamination
Shallow Wells
DeeD wells
Solid waste disposal site
Lagoons
Sanitary & industrial point discharges
Mechanical waste treatment plants
Underground chemical storage
Above ground chemical storage
1,000 feet
1,000 feet
400 feet
400 feet
400 feet
200 feet
1,000 feet
400 feet
400 feet
200 feet
200 feet
100 feet
An above ground storage tank containing diesel fuel for the airport's emergency generator is located
within 100 feet of Well #1. Adequate measures have been taken to prevent significant spills from
occurring at this site. This includes daily inspections of this site. All other separation distances for both
well sites have been met or exceeded. With this information it has been determined that Wells #1 and #2
are not physically vulnerable to organic chemical contamination.
1.b. Source (Sanitation & Construction)
This system is equipped with a flow meter and draw down equipment and they are located in the pump
house of Well # 1. The flow meter measures in cubic feet.
A small gap exists between the concrete platform and the well head. Most of the well head that interfaces
with the concrete platform has been sealed with caulk, but at one location steal wool has been used to
plug a gap. Mouse droppings in the well house are present in moderate amounts. This gap must be
properly sealed to eliminate this sanitary hazard.
A raw water tap exists and is located in the pump house of Well # 1 .
Water Supply Sanitary Survey
Dubuque Regional Airport
Page 3 of 5
1.e. Source (Influenced Groundwater Determination)
Available records indicate that these are deep wells. There is no information indicating that these wells do
not meet this department's well construction and water quality criteria. Therefore, it is determined that
these groundwater sources are not directly influenced by surface water.
2.b. Treatment (Sanitation & Construction)
The plastic line from the day tank to the pump and the line from the chlorine bulk storage to the chlorine
day tank are not properly sealed as they enter the day tank. These lines must be properly sealed where
they enter the day tank.
2.c. Treatment (Operation & Maintenance)
During this inspection I could not be determined whether the chlorine solution being used for disinfecting
was NSF certified. Any drinking water system chemical, which is added to raw, partially treated, or
finished water must be suitable for the intended use in a potable water system. Effective on October 1,
2000, the chemical must be certified to meet the current American National Standards Institute/National
Sanitation Foundation (ANSI/NSF) Standard 60, per 567 lAC 42.4(3)"b". This system must immediately
determine whether the chlorine solution is adequate, and if not, begin using an approved chlorine
solution.
A method to measure daily chlorine usage was not available at the time of this inspection. This system
must obtain a method to measure chlorine usage by volume or weight immediately.
The bulk storage container for the chlorine is a black 55-gallon drum. According to Mr. Smith, when the
bulk storage tank is filled, it takes over one year to use all of the chlorine. It is recommended that this
system only store an amount of bulk chlorine that can be used within a 2 to 3 month period. This is due to
the fact that chlorine begins to break down over time and reduces its concentration. Consideration should
be given to obtaining chlorine solution from the City of Dubuque Water Supply.
6.a. Distribution System (Sanitation & Construction)
As a reminder, at bulk water loading stations, positive separation must be provided through the use of an
air gap or a backflow preventer. This includes fire vehicles. Mr. Dalsing informed me that they have
installed backflow preventers and hire someone to inspect them on an annual basis.
7.a. Bacterioloqical Monitorinq (Samplinq Plan)
A current plan was not on site at the time of this visit. A plan must be developed and be reviewed or
updated by the public water supply system every two years and must be revised by the system as
directed by the department.
7.b. Bacterioloqical Monitorinq (Bacterial Quality)
Records in this office indicate that all bacterial quality samples of this water supply's distribution system
taken during the previous three years were analyzed to be bacterially "safe."
7.c. Bacterioloqical Monitorinq (Disinfectant Residual)
On site MORs for the most recent month indicate that free chlorine is being measured by this system. On
site testing at the SEP indicated that free chlorine was 0.42 mg/I and total chlorine was 0.76 mg/1.
Samples taken at the end of the distribution system showed free chlorine of 0.26mg/l, and total chlorine
0.46 mg/1.
This system must be able to identify whether free chlorine or combined chlorine is being used for
disinfection. To verify whether free or combined chlorine is present a raw water sample must be collected
from Well #1 and analyzed for ammonia. If ammonia is not present or the chlorine feed rate is ten times
the concentration of ammonia, free chlorine will be the chlorine used for disinfection.
A minimum of 0.3 mg/I of free or 1.5 mg/I of total chlorine must be maintained in the distribution system at
all times.
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Water Supply Sanitary Survey
Dubuque Regional Airport
Page 4 of 5
9.b. Operation (Operation Reports)
The following table is a summary of the self-monitoring requirements for the Dubuque Regional Airport
Public Water Supply:
PARAMETER LOCATION FREQUENCY
Residual Chlorine Finished (SEP), Distribution. Svstem Dailv
Flow Raw, Finished Daily
Chlorine, Amount Used Dav Tank! Scale Daily
Calculated MRDL Value Distribution System 1 / month
Static and Pumping Water Levels Well # 1 1/month
Previous Monthly Operation Reports (MORs) have been kept on site, according to Mark Smith. A review
of this Department's records indicates that they have not been submitted to this Department in the past.
Mr. Smith showed me the MOR that he was completing for the month of February. The information in this
MOR indicates that chlorine testing at the SEP is being done daily. It also indicates that no chlorine
testing is being done within the distribution system. In addition, the amount of chlorine used is not being
reported, due to the absence of a method to measure usage (see item 2.c. above).
In addition, flow and static and pumping water levels are not being reported.
Failure to submit and monitor for the parameters listed above is a violation of 567 lAC 43.2(2). All
parameters listed above must be measured, recorded and submitted to this office monthly.
10.a. Staffinq & Operator Certification (Operator. Direct Supervision)
Each community public water supply is required to designate an operator in charge for the water
treatment and water distribution segments of the water supply system. During this inspection it was
unclear if a certified operator from the City of Dubuque has been assigned to this system. This system
must obtain the services of an operator with a minimum of a Grade A certification by May 1, 2005.
11.b. S/EP Determination
During this survey, it was determined that this supply has one active source entry point (S/EP) to the
distribution system. S/EP #01 is described as TAP IN TANK ROOM,#1 and is representative of the
finished water from Well #1.
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Water Supply Sanitary Survey
Dubuque Regional Airport
Page 4 of 5
SUMMARY
Determinations:
1. Wells #1 and #2 are not physically yulnerable to organic chemical contamination.
2. These groundwater sources are not directly influenced by surface water.
3. This water supply has one actiye source entry point (S/EP).
Requirements:
1. Obtain the appropriate permits prior to construction actiyities associated with the well,
distribution system or treatment devices.
2. Continue to collect and submit all samples listed in the permit for this public water supply.
3. Deyelop and conduct bacteria sampling using an approyed sampling site plan.
4. Properly seal the gap at the well head.
5. Seal the day tank where the bulk storage tank and chlorine pump lines enter the lid.
6. Obtain a method to measure chlorine usage.
7. Complete and submit MORs to this Department on a monthly basis. MORs must include all
information listed in section 9.b. of this report.
8. A determination must be made as to whether free or combined chlorine is being used to
disinfect. Refer to section 7.c of this report.
9. Use only NSF certified chlorine.
10. Obtain a certified operator by May 1, 2005.
Recommendations:
1. Reduce the amount of chlorine kept in bulk storage to a 2 or 3 month supply.