CM-2024-225 - 8/30/2024ELECTRONICALLY RECORDED 2024088514
Williamson County, Texas Total Pages: 7
203 E. Main Street, Suite 204
Round Rock, Texas 78664
512-344-9664
TBPE FIRM 8F-19351
OWNER: yRock---"—,
PHONE: (512) 218 7016
PROPERTY ADDRESS: 1730 E. Old Settlers Blvd., Round Rock, Texas. 78665
PROJECT NAME: Fire Station #1
Sand Filter Systems:
Regular, routine maintenance is essential to effective, long-lasting performance of the sedimentation
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This intensive monitoring is intended to ensure proper operation and provide maintenance personnel with a feel
for the operational characteristics of the filter. Subsequent inspections can be limited to semi-annually or more
often if deemed necessary.
Certain construction and maintenance practices are essential to efficient operation of the BIVIP. The biggest
threat to any filtering system is exposure to heavy sediment loads that clog the filter media. Construction within
the watershed should be complete prior to exposing the filter to stormwater runoff. All exposed areas should be
stabilized to minimize sediment loads. Runoff from any unstabilized construction areas should be treated via a
separate sediment system that bypasses the filter media.
Another important consideration in constructing the filter bed is to ensure that the top of the media is
completely level. The filter design is based on the use of the entire filter media surface area; a sloped filter surface
would result in disproportionate use of the filter media.
Routine maintenance to be carried out by hand using small yard equipment. Small yard equipment shall
include but not limited to push mowers, string trimmers, shovels, rakes, and buckets. if more extensive
maintenance or sediment removal requiring a Bob Cat is need an access ramp stall be installed. Access ramp shall
be a minimum of 6' wide and have a slope less than 4HAV. After maintenance is completed pond grade shall be
returned to existing conditions.
M41017-74r.711 =0 R: F1111.1 IIII ITIMMMITIM
1) Inspections. BIVIP 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 BIVIP 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.
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Un)UTP reacnes a 1ePfRTn"b7MrffF97T=,en ine sirlctfres if
impaired. Sediment should be cleared from the inlet structure at least every year and from the
sedimentation basin at least every 5 years.
3) 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
CIVIL ENGINEERING
2024088514 Page 2 of 7
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.
4) 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.
5) Filter Underdrain: Clean underdrain piping network to remove any sediment buildup as needed to
maintain design drawdown time.
6) 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.
Record Keeping:
Records of all inspections and maintenance for the facility shall be recorded and maintained for the water quality
facility beginning at startup of the facility. Record keeping shall be detailed to provide type of maintenance or
repair made, date of the service, and detail of the extent of the maintenance or repair. The owner or responsible
party of the facility is responsible for maintaining the facility as outlined in this plan until such time as another
entity assumes responsibility in writing or ownership of the property is transferred. A copy of the transfer of
ownership or responsibility must be filed with the Executive Director of TCEQ within 30-days of the transfer.
Pond Certification
Signature:
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P.E. CERTIFICATION SEAL:
06/28/2024
2024088514 Page 3 of 7
� Laurie Hadley, City Manage
ACKNOWLEDGMENT
STATE OF TEXAS §
COUNTY OF WILLIAMSON §
;his i uent was acknowledged before me on this the 6YAday of the month of
2024, by Laurie Hadley, City Manager for the City of Round Rock, Texas in
the c• °i apty and for the purposes and consideration therein expressed.
Notary Pub c, State of Texas
2024088514 Page 4 of 7
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2024088514 Page 7 of 7
ELECTRONICALLY RECORDED
OFFICIAL PUBLIC RECORDS
2024088514
Pages- 7 Fee: $57.00
11 /05/2024 02.47 PM
OSALINAS
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Nancy E. Rister, County Clerk
Williamson County,Texas