CALFED Rock Slough Water Quality Improvement Project-Stream Flow and Water Quality Collection by Department of Water Resources
Summary
SCH Number
2002058108
Public Agency
California Department of Water Resources
(DWR)
Document Title
CALFED Rock Slough Water Quality Improvement Project-Stream Flow and Water Quality Collection by Department of Water Resources
Document Type
NOE - Notice of Exemption
Received
Posted
5/9/2002
Document Description
DWR will install two temporary water quality-monitoring stations in Rock Slough and Werner Dredger Cut, tributary to Old River. CALFED has approved funding for the Contra Costa Water District's (CCWD) Rock Slough Water Quality Improvement Project. The CCWD is a public agency supplying drinking water to about 430,000 residents in Contra Costa County. CCWD also supplies water for city and industrial uses throughout the County. CCWD diverts water from Rock Slough in the Delta via the Contra Costa Canal. Salinity measurements in the Contra Costa Canal have at times been considerably higher than measurements taken in Old River near Rock Slough. This increase implies apparent water quality degradation along Rock Slough and/or the Contra Costa Canal. Since DWR has experience installing and operating flow monitoring devices, CCWD has requested that DWR assist by installing, operating, and maintaining two acoustic doppler current profilers and two multiparameter water quality instruments. Monitoring stations in Rock Slough and Werner Dredger Cut will measure channel flow and analyze water quality samples for salinity, organic carbon, and pathogens. Each station will consist of an acoustic doppler and multi-parameter instrument mounted together on a cradle system (footprint of 2'by 4'). Divers will position each station at a sufficient depth to avoid problems to or from boat traffic. Four rebar will be hand-driven with an extension pole to secure the cradle to the channel bottom. Data from each acoustic doppler will be retrieved monthly through a cable connection, which runs up the bank and onto the levee. The Water Quality Instruments will be retrieved (also from a boat) a minimum of twice a month for maintenance depending on the amount of fouling which takes place on the probes. Water quality data will be retrieved during routine maintenance. Each monitoring station will be retrieved when the internal bettery supply (recorded with acoustic doppler data) approaches the minimum level of operating voltage for the system.
Contact Information
Name
Howard Mann
Agency Name
Department of Water Resources
Contact Types
Lead/Public Agency
Phone
Location
Counties
Contra Costa
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
15306
Reasons for Exemption
Information collection: The action involves basic data collection that does not result in serious damage or major disturbance to an environmental resource.
Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at state.clearinghouse@opr.ca.gov or via phone at (916) 445-0613.