DSHW-2007-002206 - 0901a0688013d36a

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P.O. Box 98 ••"v^ ^•-b.ivbiii^iur
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FEB 0 7 2007
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UTAH DIVISION OF
7 February 2007 SOLID & HAZARDOUS WASTE
8200-FY07-076 ^O QQ^QI
Mr. Dennis R. Downs, Executive Secretary
State of Utah
Department of Environmental Quality
Division of Solid and Hazardous Waste
288 N. 1460 W.
P.O. Box 144880
Salt Lake City, Utah 84114-4880
Dear Mr. Downs
ATTENTION: Jeff Vandel
Subject: Remediation Plans for Process Supply Well TCC3A, ATK Promontory Facility,
EPA ID #009081357
Reference: Utah DSHW Letter To ATK Promontory Facility December 28, 2006,
Remediation Plans for Groundwater Process Supply Well TCC3.
In the above referenced letter your office requested our plans for a treatment system for the Plant 3
process supply well TCC3.
Attached please find our initial plans and construction schedule for the treatment system.
If you have any questions regarding this request, please direct them to Paul Hancock at (435) 863-
3344.
Sincerely
David P. Gosen, P.E., Director
Environmental Services
Plant 3 Well 3A Treatment System Plans
ATK Launch Systems Promontory Facility
Current Conditions
The Plant 3 well 3A currently has a 450 gallon per minute capacity pump that pumps
water into the distribution system and a 100,000 gallon holding tank. The pump is
controlled by the level of water in the tank. The pump tums on when the tank is
approximately 90% full and shuts off when the tank is full.
The well head, along with electrical panels and chlorination equipment, is currently
located below ground level, which is considered a safety concem and a maintenance
problem
Construction Plans
The well head will be raised above ground level in a newly constmcted pump house that
will be large enough to also house an activated carbon filter to remove the TCE. It will
also house chlorination equipment to disinfect the water after it is passes through the
carbon. The proposed carbon vessel is a Tigg Corporation model C50RX polyethylene
lined steel tank with a maximum capacity of 80 gallons per minute.
A new more efficient well pump will be installed to meet the approximately 70 gallons
per minute to stay within the capacity of the filter. All of the water from the well will
pass through the carbon absorption vessel before it enters the distribution system. The
pump house will have a large access door and roof hatches to facilitate servicing of the
equipment.
A preliminary drawing of the treatment system is attached.
Construction Schedule
Design of the facility is tentatively scheduled to begin in the second quarter of 2007, with
constmcfion scheduled primarily in the third quarter of 2007. Due to the cost of
constmction, this project is currently in a capital funding request process.
Operational Plans
All groundwater pumped at well 3A will pass through the carbon vessel prior to entering
the distribution system and storage tank. There will be a maximum pump rate of 70 gpm.
Flow rates will be automatically controlled and will eventually be monitored at a central
controller located at building M-6.
The building containment will control leaks and spills sufficient to contain the contents of
the carbon vessel. The building leak control system will consist of a sloped floor
draining to a sump with an overflow drain back into the well.
Sampling valves will be installed on the influent and effluent pipes of the carbon vessel.
This will allow for ongoing monitoring of the treatment system.
The vessel has been sized to have an estimated 3 month service life for the carbon prior
to TCE break through. The monitoring frequency of the treated water will be as outlined
in Table 1.
Table 1
Effluent Monitoring Frequency Using VOC EPA Method 8260
Start Up
First Week (5 days)
Daily Samples
First 3 Months
Weekly Samples
Operational Monitoring
Bi-Weekly samples
Back pressure on the carbon vessel, using the pressure differential on the influent and
effluent pressure gages, will be monitored on a bi-weekly basis to verify conditions of the
carbon.
Records of the monitoring and flow rates will be maintained at the facility and supplied
to the Utah DSHW as requested.
Prior to break through or approximately every 3 months, the carbon in the vessel will be
changed out with fresh carbon. Actual operational data will demonstrate the life of the
carbon in this application.
In addition, any TCE breakthrough, or pressure differentials indicating plugging of the
carbon vessel, will initiate change out of the carbon.
The carbon change out procedures will include these steps:
Shut down well pump
Isolate vessel from effluent line
Open vessel vent
Drain vessel back into well
Remove vessel from building and transport to M-705 (no manifest needed as it will be
transported on a road contiguous to the facility).
Remove spent carbon and replace with fresh.
Transport vessel to Plant 3 well house
Install piping to vessel
Tum on pump and check for leaks.
It is estimated that this process will take 3-4 hours. During this interim, water will be
supplied to the system by the storage tank.
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PLANT 3 WELL