CM-11-04-071ROUND ROCK, TEXAS
PURPOSE, PASSION. PROSPERITY.
Item Caption:
City Manager Approval Summary Sheet
Consider executing the Inspection, Maintenance, Repair, and Retrofit Plan for the Sam
Bass Road/Chisholm Trail Modifications Project as needed for the TCEQ Water Quality
Permit.
Approval Date: April 1, 2011
Department: Infrastructure Development and Construction Management
Project Manager: Bill Stablein
Item Summary:
The completed Inspection, Maintenance, Repair and Retrofit Plan for Sam Bass Road/Chisholm Trail Modifications is
needed as an enclosure in the water pollution abatement plan (WPAP) application to the Texas Commission for
Environmental Quality (TCEQ). This document details the City of Round Rock's maintenance requirements for this
water WPAP.
Strategic Plan Relevance:
27.0 - Ensure there is an adequate and safe water supply.
Cost:
Source of Funds:
N/A
N/A
INSPECTION, MAINTENANCE, REPAIR AND RETROFIT PLAN
For
Sam Bass Road/Chisholm Trail Modifications
FACILITY LOCATION
AW0284 HARRELL, J.M. SUR., ACRES 0.787
Located on Emmanuel St
Round Rock, Texas 78681
PLAN FOR THE INSPECTION, MAINTENANCE, REPAIR AND RETROFIT OF THE SAND FILTER
WATER QUALITY POND
• Inspections. BMP facilities must be inspected at least twice a year (once during or immediately
following wet weather) to evaluate facility operation. During each inspection, erosion areas
inside and downstream of the BMP must be identified and repaired or revegetated immediately.
With each inspection, any damage to the structural elements of the system (pipes, concrete
drainage structures, retaining walls, etc.) must be identified and repaired immediately. Cracks,
voids and undermining should be patched/filled to prevent additional structural damage. Trees
and root systems should be removed to prevent growth in cracks and joints that can cause
structural damage.
• Sediment Removal. Remove sediment from the inlet structure and sedimentation chamber
when sediment buildup reaches a depth of 6 inches or when the proper functioning of inlet and
outlet structures is impaired. Sediment should be cleared from the inlet structure at least every
year and from the sedimentation basin at least every 5 years.
• Media Replacement. Maintenance of the filter media is necessary when the drawdown time
exceeds 48 hours. When this occurs, the upper layer of sand should be removed and replaced
with new material meeting the original specifications. Any discolored sand should also be
removed and replaced. In filters that have been regularly maintained, this should be limited to
the top 2 to 3 inches.
• Debris and Litter Removal. Debris and litter will accumulate near the sedimentation basin outlet
device and should be removed during regular mowing operations and inspections. Particular
attention should be paid to floating debris that can eventually clog the control device or riser.
• Filter Underdrain. Clean underdrain piping network to remove any sediment buildup as needed
to maintain design drawdown time.
• Mowing. Grass areas in and around sand filters must be mowed at least twice annually to limit
vegetation height to 18 inches. More frequent mowing to maintain aesthetic appeal may be
necessary in landscaped areas. Vegetation on the pond embankments should be mowed as
appropriate to prevent the establishment of woody vegetation.
• Documentation. Maintain a log of all inspection, maintenance, repair and retrofit activities in the
office of the facility supervisor. The log should be available for review by a TCEQ inspector
upon request.
„V(
Owner C1 /N►, 4E61 ERS ,CI3
Assislau.4 �i#t� I'Vke.vtaq[iZ
0
ev'&—t I -o4 -o7 1
(Engineer's certification required on form)
Dat+1-8
e