A -- WATER SAMPLER/FLOW METER SPECIFICATIONS

Notice Date

September 7, 2001

Contracting Office

USDA, Forest Service, PSW, 800 Buchanan Street, West Building, Albany, CA 94710

ZIP Code

94710

Solicitation Number

PSWFRESNO-01-022

Response Due

September 13, 2001

Point of Contact

Patrick Linkenhoger, 510-559-6374

E-Mail Address

plinkenhoger@fs.fed.us (plinkenhoger@fs.fed.us)

Description

The King's River Experimental Watershed is monitoring flow, water chemistry and sediment as a way of evaluating stream health following prescribved burn and/or partial harvest management. To do this we must be able to pull water samples from streams during high flows when Forest Service personnel are not at the site. We are looking for a system that will be capable of automatically taking samples based on intervals that are either flow-paced (i.e. one sample every 5000 cubic meeters) or turbidity-paced (i.e. a sample every time turbidity increases by 30% percentage). Turbidity-paced sampling requires a sensor that can determine when suspended sediment in the water is increasing. In either of these scenarios samples are drawn when a preset condition is reached, therefore it is important that the flowmeter and turbidity devices be able to communicate with a sampler device that can draw water from the stream. The most attractive system for the study are those where one company bundles all three instruments (flow, turbidity and sampler) together with software that allows us to program a sampling protocol. 1. Sampler includes integral data logger with capability of storing flow, turbidity, temperature, pH and conductivity data for one month. 2. Sampler / datalogger compatible with a single sonde capable of collecting turbidity, pH, EC and temperature data. 3. Sampler must be compatible with bubbler flow meter, capable of working in cold and snowy winter conditions. 4. Sampler / datalogger run by programmable software linking sampler with flowmeter and sonde a. Sampler is capable of flow-paced sampling, i.e. a sample every 5000 cubic meters of flow. b. Sampler is capable of turbidity-paced sampling, i.e. a sample whenever a turbidity increases by 30%. 5. Sampler / datalogger needs to be rugged, lightweight (<35 lbs.) and portable. 6. Sampler intake velocities of 3ft/sec for head changes of up to 9 ft. in order to capture the suspended sediment and sand particles in highly turbid water. 7. Sampler must be capable of taking and storing multiple sampels (at least 24 bottles). 8. Datalogger must be capable of downloading data and being programmed remotely using a radio modem. 9. Entire system needs to be powered by 12V DC power supply.*****

Record

Loren Data Corp. 20010911/ASOL001.HTM (W-250 SN50X0H3)