RFP_5000_BYS3046_TECH_DOC_1_v1.pdf
PDF 5 MB Posted
- Solicitation number
- RFP 5000 BYS3046
- Issued by
- Texas
About this file
This is a technical documentation file supporting a Request for Proposals (RFP 5000 BYS3046) issued by the City of Austin, Texas for maintenance and repair services of pond pump and irrigation systems. The document provides detailed specifications and construction notes for a water quality and detention pond located at the Cameron Road Warehouse in Cameron Industrial Park (14910 Cameron Road, Pflugerville, TX 78660). The pond is approximately 15,019 square feet and functions as both a detention and water quality/biofiltration facility. The technical specifications detail requirements for biofiltration medium installation, underdrain systems using PVC pipes with washed river gravel envelopes, geotextile filter fabric meeting City of Austin standards, level spreaders for flow distribution, and infiltration testing protocols. The document includes aerial photographs, site plans, cross-sectional profiles, and detailed construction drawings prepared by Garza EMC, LLC with design specifications referencing the City of Austin Environmental Criteria Manual standards.
The technical specifications establish comprehensive construction and quality assurance requirements for the biofiltration pond system, including provisions for separator element structures with vegetated hedgerows, biofiltration medium bed depths of minimum 18 inches meeting City specifications, underdrain lateral pipe spacing of maximum 10 feet with 3-inch minimum gravel envelope thickness, and mandatory infiltration testing per ASTM D 3385-09 standard conducted both immediately after media installation and prior to final engineer concurrence. Critical operational requirements include erosion control measures maintained throughout construction, prohibition of heavy equipment in biofiltration areas after media placement, sediment monitoring and removal during rain events, and contractor responsibility for site stabilization to prevent sediment intrusion. The specifications emphasize coordination with an environmental inspector, documentation of all erosion control measures, and adherence to City of Austin High Flow Filter Fabric specifications and standard specifications for all materials, with particular attention to proper installation techniques that prevent media compaction and ensure adequate water infiltration performance.
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Other files
| File | Type | Posted |
|---|---|---|
| RFP_5000_BYS3046_ATT_3_v1.pdf | ||
| RFP_5000_BYS3046_TECH_DOC_6_v1.pdf | ||
| RFP_5000_BYS3046_PAC2_v1.docx | DOCX document | |
| RFP_5000_BYS3046_ATT_1_v1.xlsx | XLSX spreadsheet | |
| RFP_5000_BYS3046_TECH_DOC_4_v1.pdf | ||
| RFP_5000_BYS3046_0600_v1.xlsx | XLSX spreadsheet | |
| RFP_5000_BYS3046_0500_v1.pdf | ||
| RFP_5000_BYS3046_ATT_4_v1.pdf | ||
| RFP_5000_BYS3046_TECH_DOC_3_v1.pdf | ||
| RFP_5000_BYS3046_ADD_1_v1.pdf | ||
| RFP_5000_BYS3046_ATT_2_v1.pdf | ||
| RFP_5000_BYS3046_PAC1_v1.pdf | ||
| RFP_5000_BYS3046_TECH_DOC_2_v1.pdf | ||
| RFP_5000_BYS3046_TECH_DOC_5_v1.pdf |
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Text version
Exhibit A – AE Stormwater Pond Aerial Photographs
Cameron Road Warehouse -Cameron Industrial Park
14910 Cameron Road
Pflugerville, TX 78660
Pond Type: Detention and Water Quality / Biofiltration
Approximate Pond Area = 15,019 SF
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PROFILE SCALEPROFILE LEGEND
SP-2023-0178D
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SP-2023-0178D
BIOFILTRATION POND NOTES:
1. A SEPARATOR ELEMENT STRUCTURE IS REQUIRED FOR THE PARTIAL SEDIMENTATION BIOFILTRATION POND BETWEEN THE SEDIMENTATION AND FILTRATION AREAS AND SHOULD BE DESIGNED TO DISCHARGE THE FLOW EVENLY ACROSS THE FILTRATION BASIN. A REINFORCED VEGETATED HEDGEROW IS RECOMMENDED THAT USES FIVE (5) INCH BY EIGHT (8) INCH ROCK FLOW SPREADERS OR LOW GABION STRUCTURES, TWO (2) FEET WIDE AND SIX (6) INCHES TO TWELVE (12) INCHES DEEP, WITH HEDGEROWS LOCATED WITHIN THE STRUCTURE (SEE CITY OF AUSTIN ENVIRONMENTAL CRITERIA MANUAL (ECM) 1.6.7.C.2, FIGURE 1.6.7.C-2). THE OUTFLOW SIDE SHOULD INCORPORATE FEATURES TO PREVENT GOUGING OF THE FILTRATION
MEDIUM.
2. THE BIOFILTRATION MEDIUM SHALL MEET THE PERFORMANCE CRITERIA OUTLINED IN THE CITY OF AUSTIN ENVIRONMENTAL CRITERIA MANUAL (ECM)
1.6.7.C.4 AND THE CITY OF AUSTIN STANDARD SPECIFICATION SECTION 660S.1.
3. THE BIOFILTRATION MEDIUM BED FOR BIOFILTRATION BASINS MUST BE BUILT TO THE BIOFILTRATION BED CONFIGURATION ILLUSTRATED IN FIGURE 1.6.7.C-3 OF THE CITY OF AUSTIN ENVIRONMENTAL CRITERIA MANUAL (ECM) 1.6.7.C.4 (FOR DETAILS SEE STANDARD DETAIL 661-3).
4. THE BIOFILTRATION MEDIUM LAYER IS TO BE A MINIMUM OF EIGHTEEN (18) INCHES MEETING THE SPECIFICATIONS STATED. OTHER MATERIALS OR SUBSTANCES THAT MAY BE HARMFUL TO PLANT GROWTH OR PROVE A HINDRANCE TO THE PLANTING OR MAINTENANCE OPERATIONS SHALL NOT BE MIXED OR DUMPED WITHIN THE BIOFILTRATION AREA. NOTE: REQUIRED BIOFILTRATION MEDIUM BED DEPTHS SHOULD BE INTERPRETED AS FINAL
CONSOLIDATED VALUES RATHER THAN AS INITIALLY PLACED.
5. THE BIOFILTRATION UNDERDRAIN SYSTEM SHALL CONSIST OF ONE-HALF (0.5) TO ONE AND ONE-HALF (1.5) INCH DIAMETER WASHED, ROUNDED, RIVER GRAVEL SURROUNDING 6 INCH SCHEDULE 40 PVC UNDERDRAIN LATERAL PIPES. THE MAXIMUM SPACING FOR THE LATERALS SHOULD BE TEN (10) FEET BETWEEN LATERALS AND FIVE (5) FEET FROM A WALL OR SIDE. THE MINIMUM THICKNESS OF THE GRAVEL ENVELOPE IS 3 INCHES. THE SOIL MEDIUM
AND GRAVEL LAYER MUST BE SEPARATED BY A FILTER MATERIAL.
6. THE UNDERDRAIN FILTER MATERIAL GEOTEXTILE FABRIC SHALL MEET THE CITY OF AUSTIN HIGH FLOW FILTER FABRIC SPECIFICATIONS AS OUTLINED IN THE CITY OF AUSTIN ENVIRONMENTAL CRITERIA MANUAL (ECM) 1.6.7.C.4 AND THE CITY OF AUSTIN STANDARD SPECIFICATION SECTION 620S.1, TABLE 2:
7. THE GRADATION OF A GRANULAR FILTER DESIGN MUST COMPLY WITH SECTION 1.4.6.D.6, ROCK RIPRAP - FILTER. IN CASES WHERE THE REQUIREMENTS CANNOT BE MET WITH A SINGLE GRADATION MULTIPLE LAYERS OF GRANULAR FILTER MATERIAL OF VARYING GRADATIONS MAY BE REQUIRED TO MEET THE CRITERIA. THE THICKNESS OF A GRANULAR FILTER LAYER SHOULD BE NO LESS THAN 1.5 TIMES THE MAXIMUM SIZE IN THE FILTER
GRADATION OR FOUR INCHES (102 MM) WHICHEVER IS GREATER.
8. PRIOR TO COMMENCING THE RAIN GARDEN / BIOFILTRATION POND WORK, ALL REQUIRED EROSION CONTROLS AND TEMPORARY SEDIMENT CONTROL MEASURES SHALL BE IN PLACE PER THE APPROVED SITE PLAN AND/OR AS MODIFIED BY THE ENVIRONMENTAL INSPECTOR AND INSPECTED TO
ENSURE THEY ARE FUNCTIONING PROPERLY.
9. PRIOR TO COMMENCING THE INSTALLATION OF THE RAIN GARDEN / BIOFILTRATION POND UNDERDRAIN, GEOTEXTILE FABRIC, OR BIOFILTRATION
MEDIA:
a. ENSURE THAT ALL REQUIRED EROSION CONTROLS AND TEMPORARY SEDIMENT CONTROL MEASURES ARE IN PLACE AND HAVE BEEN INSPECTED TO
ENSURE THEY ARE FUNCTIONING PROPERLY.
b. REMOVE ANY AND ALL SEDIMENT BUILDUP FROM CONSTRUCTION ACTIVITIES IN THE RAIN GARDEN / BIOFILTRATION POND.
c. ENSURE THAT THE SITE AREA DRAINING TO THE RAIN GARDEN / BIOFILTRATION POND, INCLUDING ANY POND EARTHEN SIDE SLOPES AND, IS
STABILIZED SUCH THAT SEDIMENT FROM DISTURBED AREAS IS NO LONGER ENTERING THE RAIN GARDEN / BIOFILTRATION POND.
10. TO AVOID COMPACTION OF THE BIOFILTRATION MEDIUM AND PROMOTE WATER INFILTRATION, HEAVY EQUIPMENT SHALL NOT BE ALLOWED IN
BIOFILTRATION AREA AFTER THE BIOFILTRATION MEDIUM HAS BEEN PLACED. WHEN INSTALLING THE BIOFILTRATION MEDIA, DO SO IN A MANNER TO ENSURE THAT THE MEDIA IS NOT COMPACTED OR DRIVEN ON BY EQUIPMENT DURING THE INSTALLATION. THE BIOFILTRATION MEDIA SHALL BE PLACED
IN LIFTS WITHOUT HEAVY OPERATING EQUIPMENT OR COMPACTION.
11. IMMEDIATELY UPON COMPLETION OF THE BIOFILTRATION MEDIA INSTALLATION AND PRIOR TO ANY RAIN EVENTS, AN INFILRATION TEST FOLLOWING ASTM D 3385--09 STANDARD TEST METHOD FOR INFILTRATION RATE OF SOILS IN FIELD USING DOUBLE-RING INFILTROMETER SHALL BE PERFORMED AND PROVIDED TO THE ENGINEER FOR CONFIRMATION THAT THE INSTALLED BIOFILTRATION MEDIA MEETS THE INFILTRATION REQUIREMENTS OF THE
CITY OF AUSTIN ENVIRONMENTAL CRITERIA MANUAL (ECM) 1.6.7.C.4 DESIGN CRITERIA.
12. AFTER INSTALLATION OF THE BIOFILTRATION MEDIA, CONTRACTOR SHALL MONITOR THE RAIN GARDEN / BIOFILTRATION POND DURING ANY RAIN EVENTS AND INSTALL ADDITIONAL TEMPORARY SEDIMENT CONTROL MEASURES AS NEEDED TO PREVENT SEDIMENT FROM DISTURBED AREAS FROM
ACCUMULATING ON OR IN THE BIOFILTRATION MEDIA.
13. LEAVE ALL SITE EROSION CONTROLS IN PLACE AND MAINTAIN THEM REGULARLY UNTIL ALL DISTURBED AREAS ARE REVEGETATED OR OTHERWISE STABILIZED AND NO SEDIMENT FROM UN-STABILIZED AREAS IS ENTERING THE RAIN GARDEN / BIOFILTRATION POND. ONLY REMOVE EROSION
CONTROLS ONCE ALL DISTURBED AREAS ARE FULLY STABILIZED.
14. IF SEDIMENT IS ALLOWED TO ENTER THE RAIN GARDEN / BIOFILTRATION POND AFTER THE INSTALLATION OF THE BIOFILTRATION MEDIA, IT SHOULD BE REMOVED IMMEDIATELY. IF LARGE VOLUMES OF SEDIMENT IS ALLOWED TO ACCUMULATE ON OR IN THE BIOFILTRATION MEDIA, THE BIOFILTRATION MEDIA AND POTENTIALLY THE FILTER FABRIC MAY NEED TO BE REMOVED AND REPLACED IF IT BECOMES CLOGGED BY SEDIMENT.
15. PRIOR TO THE REQUEST FOR FINAL ENGINEER'S CONCURRENCE, AN INFILRATION TEST FOLLOWING ASTM D 3385--09 STANDARD TEST METHOD FOR INFILTRATION RATE OF SOILS IN FIELD USING DOUBLE-RING INFILTROMETER SHALL BE PERFORMED AND PROVIDED TO THE ENGINEER FOR CONFIRMATION THAT THE INSTALLED BIOFILTRATION MEDIA MEETS THE INFILTRATION REQUIREMENTS OF THE CITY OF AUSTIN ENVIRONMENTAL
CRITERIA MANUAL (ECM) 1.6.7.C.4 DESIGN CRITERIA.
03/19/2024
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634S-1
LEVEL SPREADER
LEVEL SPREADER
STABILIZED SLOPE
CHANNEL GRADE= 0%
DIVERSION
FL
OW
CROSS SECTION
LEVEL SPREADER
SECOND STRIP
GENERAL NOTES:
3. LEVEL SPREADER SHALL BE CONSTRUCTED ON UNDISTURBED SOIL (NOT ON FILL).
8. PERIODIC INSPECTION AND REQUIRED MAINTENANCE SHALL BE PROVIDED.
STANDARD SYMBOL
L=
CITY OF AUSTIN
STANDARD NO.
ADOPTED
WATERSHED PROTECTION DEPARTMENT
CITY OF AUSTIN
THE ARCHITECT/ENGINEER ASSUMES
RESPONSIBILITY FOR APPROPRIATE USE
OF THIS STANDARD.
LAST 6 m (20') OF DIVERSION
NOT TO EXCEED 1% GRADE
UNDISTURBED
OUTLET
FIRST STRIP OF
PROTECTIVE MATERIAL
LEVEL LIP OF
SPREADER
BOTH STRIPS OF PROTECTIVE
MATERIAL OVER EROSION STOP
100 mm (4'') MIN.
1.8 m (6') MIN.
FOR STAPLE REQUIREMENTS
SEE STANDARD & SPECIFICATIONS
FOR PROTECTIVE MATERIAL
150 mm (6'') MIN.
FILTER FABRIC
(U.V.)
0.3 m (1')
2. CONSTRUCT LEVEL LIP ON ZERO PERCENT GRADE TO INSURE UNIFORM SPREADING OF
SEDIMENT-FREE RUNOFF (CONVERTING CHANNEL FLOW TO SHEET FLOW).
4. A MATTING EROSION STOP SHALL BE PLACED VERTICALLY AND AT LEAST 150 mm (6'') DEEP IN A SILT TRENCH 0.3 m (1') BACK OF AND PARALLEL WITH THE LIP. THIS
EROSION STOP SHALL EXTEND THE ENTIRE LENGTH OF THE LEVEL LIP AND SHALL BE
TRIMMED AFTER BACKFILLING WITH TAMPED SOIL, SO THAT THE UPPER EDGE IS FLUSH
WITH THE SOIL SURFACE.
1. LEVEL SPREADERS SHALL BE INSTALLED UNDER THE DIRECT SUPERVISION OF THE
ENGINEER.
5. THE ENTIRE LEVEL LIP AREA SHALL BE PROTECTED BY PLACING 2 STRIPS OF JUTE,
EXCELSIOR OR OTHER APPROVED PROTECTIVE MATERIAL AS SHOWN ABOVE.
6. THE ENTRANCE CHANNEL SHALL NOT EXCEED A 1% GRADE FOR AT LEAST 6 m
(20') BEFORE ENTERING SPREADER.
7. STORM RUNOFF CONVERTED TO SHEET FLOW SHALL OUTLET ONTO STABILIZED AREAS.
WATER SHALL NOT BE RECONCENTRATED IMMEDIATELY BELOW THE POINT OF DISCHARGE.
3/27/00RECORD COPY SIGNED
BY J. PATRICK MURPHY
SP-2023-0178D
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03/19/2024
Cameron Road Warehouse -Cameron Industrial Park
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