SOLICITATION NOTICE
D -- Remote Groundwater Level Monitoring at Whittier Narrows Dam, South El Monte, Los Angeles County, California.
- Notice Date
- 6/2/2009
- Notice Type
- Presolicitation
- NAICS
- 334519
— Other Measuring and Controlling Device Manufacturing
- Contracting Office
- Department of the Army, U.S. Army Corps of Engineers, U.S. Army Corps Of Engineers, Los Angeles, US Army Corps Of Engineers, Los Angeles, P.O. Box 532711, Los Angeles, CA 90053-2325
- ZIP Code
- 90053-2325
- Solicitation Number
- W912PL-09-T-0006
- Response Due
- 6/15/2009
- Archive Date
- 8/14/2009
- Point of Contact
- Cynthia H. McManus, 213-452-3247<br />
- E-Mail Address
-
US Army Corps Of Engineers, Los Angeles
(cynthia.h.mcmanus@usace.army.mil)
- Small Business Set-Aside
- Total Small Business
- Description
- SCOPE OF WORK 17 May 2009 1. LOCATION: Whittier Narrows Dam, South El Monte, Los Angeles County, California. 2. ITEM: Remote Groundwater Level Monitoring at Whittier Narrows Dam 3.BACKGROUND AND LOCATION: a. Whittier Narrows Dam is a flood control embankment located in Southern California approximately 13 miles east of downtown Los Angeles (N34.0213, E118.0703). As such, the dam is in a highly urbanized area and is readily accessible via major freeways and surface streets. The earthen embankment dam is founded on deep alluvial deposits and does not have a positive cutoff, therefore seepage under and through the embankment is anticipated in the design. Water is impounded infrequently in the reservoir only after storm events and is released in a regulated manner to facilitate groundwater recharge within and downstream from the reservoir while minimizing uncontrolled seepage downstream and maintaining a high level of dam safety. As a part of the design, a series of 50-foot deep, 8-inch diameter relief wells are located at the downstream toe of the dam on a 50 to 100-foot spacing. Groundwater levels typically vary between 10 and 30-feet below ground surface (bgs) under the central portion of the 3-mile long embankment but may rise as high as 2 feet bgs in the relief wells (the top of a lateral pipe connection to a toe drain from the relief well casing is at a depth of 2-feet). Because of the relatively coarse, pervious nature of the foundation materials, groundwater under the dam reacts rapidly to reservoir impoundment and in select locations at the downstream toe can be expressed at the ground surface and create surface ponding. Therefore, groundwater levels are a critical to the operation of the dam when water is being maintained in the reservoir. At the present time, groundwater levels must be monitored manually by sounding a few of the 141 relief wells during rain events or reservoir impoundment. b. Because of the dams close proximity to a highly urbanized area, the location of the relief wells is easily accessible to both authorized and un-authorized persons. Therefore, vandalism of structures and equipment is a constant threat. c. As a part of a currently on-going dam safety assessment for Whittier Narrows Dam, it is anticipated that additional seepage control measures such as gravel drains and berms may be constructed within several years at the downstream toe of at least a portion of the central embankment (between Rosemead Blvd. and the San Gabriel River spillway). This construction would be in the area of the existing relief wells. d. Currently, the Los Angeles District Reservoir Regulation Section maintains web-based data on reservoir levels, inflow and outflow volumes, and precipitation for all dams in the District. (http://www.spl.usace.army.mil/resreg/) At Whittier Narrows Dam, this data is telemetered via line-of-sight transmission for both the Rio Hondo and San Gabriel River drainages from transmitters at control houses on the top of each end of the embankment. 4.PURPOSE OF WORK: The purpose of remotely monitoring groundwater levels at Whittier Narrows dam is threefold: a. Prior to construction of any additional seepage control measures, real-time groundwater levels would allow optimum assessment of conditions relating to safe and efficient operation of the dam during storm events. b. Remote sampling of groundwater level data would provide valuable data relating to the response of groundwater levels to reservoir surface elevations. This data could be useful in optimizing the design of additional seepage control measures. c. After construction of any additional seepage control measures, real-time measurements of groundwater levels at the downstream toe could be used to assess the effectiveness and operation of the system. 5.SERVICES REQUIRED: a. Install pressure transducers or piezometers to measure groundwater levels at three locations at the downstream toe of the dam. Existing relief wells may be used for installation or new, cased holes constructed for that purpose. The locations shall be in the areas as follows: Area DesignationStations within AreaRelief Wells in AreaTotal Depth FromTo 156+8072t.d. 47.0 59+0074t.d. 49.0 265+6080t.d. 45.0 81t.d. 47.8 82t.d. 49.0 67+6583t.d. 48.0 381+3597t.d. 48.5 98t.d. 49.5 99t.d. 49.5 84+45100t.d. 48.9 b. Install data logger for each pressure transducer capable of data transmission to a remote site (radio, cell phone, GOES, etc.). c. Provide necessary power for each installation (hard wired, solar panel, rechargeable battery, etc.). d. Construct site security for each site (chain link fencing, instrument house, buried equipment enclosure, etc.). e. Provide hardware and software as necessary to access data from remote computers. 6.PERIOD OF SERVICE:The work and services in the time allowed as follows: Complete installation of hardware: 60 calendar days after written notification of purchase order award. Successful data transmission and remote download: 90 calendar days after written notification of purchase order award. 7.ITEMS AND DATA TO BE FURNISHED BY THE GOVERNMENT: The Government shall make available to the contractor relevant information from related studies, design memorandums, and other pertinent data available in its files which may contribute to the preparation of the project, including the following: Relief Well Pumping Test Data Report Whittier Narrows Dam prepared for USACE Los Angeles by AMEC Geomatrix, Inc., 2009. A visit to the project site will be arranged, date TBD 8.OTHER REQUIREMENTS: The contractor shall prepare a project schedule and coordinate all aspects of the work prior to execution with project manager David Lukesh, USACE Los Angeles District Geotechnical Branch, (213) 452-3595. 9.PAYMENT FOR WORK AND SERVICES: The Government will award a Firm Fixed-Price Purchase Order. The agreed upon awarded price shall constitute full compensation by the Government to the contractor for the work and services performed under this Scope of work.
- Web Link
-
FBO.gov Permalink
(https://www.fbo.gov/spg/USA/COE/DACA09/W912PL-09-T-0006/listing.html)
- Place of Performance
- Address: US Army Corps Of Engineers, Los Angeles P.O. Box 532711, Los Angeles CA<br />
- Zip Code: 90053-2325<br />
- Zip Code: 90053-2325<br />
- Record
- SN01833001-W 20090604/090602234728-ec93baaf3cdd487dc6b9cd95dbef88ea (fbodaily.com)
- Source
-
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