MODIFICATION
B -- Amendment to previous announcement
- Notice Date
- 4/18/2005
- Notice Type
- Modification
- Contracting Office
- U S GEOLOGICAL SURVEY, APS PO BOX 25046, MS204B DENVER FEDERAL CENTER DENVER CO 80225
- ZIP Code
- 80225
- Solicitation Number
- 05CR06-NOSOLICITION
- Response Due
- 5/2/2005
- Archive Date
- 4/18/2006
- Point of Contact
- GAIL WALKER PURCHASING AGENT 3032369334 ;
- E-Mail Address
-
Email your questions to Point of Contact above, or if none listed, contact the IDEAS EC HELP DESK for assistance
(EC_helpdesk@NBC.GOV)
- Description
- The announcement is revised to include the following requirements: The contract may be awarded with two (2) one-year options. Continuity of analyses is essential as consistency of results is needed to expedite regional comparisons. The primary objectives of this paleolimnological study are: 1) a historical quantitative reconstruction of the ecological impacts of damming and water level manipulation on the Rainy-Namakan Reservoir system over the last 100 years, 2) a historical reconstruction of coincident environmental changes in an upstream "control" large lake system, Lac La Croix, and 3) the determination of regional and scale-dependent pre-damming/pre-European "natural" lake conditions and historical lake response variability during the last 500 years due to catchment history, lake ontogeny, and climate change. Completion of this project shall require the collection of four approximately 1.5 m sediment cores from the Rainy Lake-Namakan Reservoir system and one core from Lac La Croix, which is located upstream in the watershed. At least 40 sections from each core (between 200 and 300 samples total) shall be analyzed for siliceous microfossil remains (diatom valves and chrysopyte cysts) for approximately decadal resolution of environmental change during the last 400 to 500 years. Siliceous remains along one or more random microslide transects shall be counted on a research grade microscope using full oil immersion optics capable of N.A. 1.4 and 1250x until a total of 400 diatom microfossils is reached. Regional floras and primary literature shall be used to achieve consistency in the identification of diatoms. The contractor shall use weighted average calibration and reconstruction to infer historical water column total phosphorus concentrations, alkalinity (as ANC), and dissolved organic carbon (as water color). Transfer functions of diatom species environmental optima and tolerances developed from existing training sets of diatom assemblages and selected environmental parameters from modern lakes in Minnesota and northwestern Ontario shall be applied to historical diatom assemblages in sediment cores to reconstruct specific environmental variables.
- Web Link
-
Please click here to view more details.
(http://ideasec.nbc.gov/j2ee/announcementdetail.jsp?serverId=GS1434HQ&objId=728612)
- Record
- SN00790421-W 20050420/050418211926 (fbodaily.com)
- Source
-
FedBizOpps.gov Link to This Notice
(may not be valid after Archive Date)
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