New Jersey Water Science Center
Great Falls of the Passaic River at Paterson, N.J.
USGS IN YOUR STATE
USGS Water Science Centers are located in each state.
Nutrient Monitoring for TMDL's
Project Title:Nutrient Monitoring for TMDL's
The purpose of this project is to obtain chemical and physical water-quality data and streamflow measurements at
Statement of Problem
The Federal Clean Water Act, Sections 303(d) and 305 (b) mandates that states develop a list of water bodies summarizing the state’s water quality and a sub list identifying impaired water bodies for which total maximum daily loads (TMDLs) may be necessary. This project will address the monitoring needs for nutrient and conventional TMDL development in the Saddle and Salem River watersheds. Historical water quality data in these watersheds is not sufficient to cover the needs of the TMDL process. Sampling design is based on a number of factors such as land use, and size of the impaired watersheds, data needs to develop, calibrate, and verify defensible water quality models, and the number of impaired parameters to be addressed by TMDL.
Strategy and Approach
The USGS will collect, analyze, and publish water quality and streamflow data during 12 events at 19 stream sites (8 in the Saddle River basin and 11 in the Salem River basin) and during 2 synoptic events at another 24 stream sites (12 in each basin). The events will be defined by season and hydrologic conditions. Eight samples will be collected during baseflow, 4 during elevated flow and 2 during synoptic events during ambient and elevated flow conditions. A listing of parameters measured in the field and analyzed at the laboratory is included in the project Quality Assurance Sampling Plan. USGS downstream order numbers are assigned to all sites and added to the USGS National Water Inventory System (NWIS) database.
NJDEP personnel may modify the sampling plan if the water quality data sampled during the initial phases of the project indicate phosphorus is not the limiting nutrient. If it is not a limiting nutrient and the data do not show the streams to be unsuitable for their designated uses, the remaining project resources could be used to begin sampling in another watershed.
Continuous-monitoring of dissolved oxygen, water temperature, specific conductance, and pH will done for 72 hours using data loggers at 2 sampling locations during 2 sampling events.
Sediment Oxygen Demand (SOD) will be monitored in the field at 19 sites during three sampling events. Four replicate samples will be collected during each event. Four SOD sampling units will be built for field application. Since there are no standard operating procedures for collecting SOD data, a USGS Science Investigative Report will be published to document the procedures used and to publish the data.
USGS personnel will prepare the field forms and analytical service request forms, purchase the appropriate sample filters, bottles, and preservatives required by the laboratories, measure the field parameters, collect the samples and ship the samples to the USGS National Water Quality Laboratory (NWQL) or the New Jersey Department of Health and Senior Services Laboratory for analyses. The USGS New Jersey Water Science Center will receive, quality assure and review all data to determine if data meets project data quality objectives. All approved data will be stored in the NWIS database. Data will also be available from the USGS NWISWEB site http://waterdata.usgs.gov/nj/nwis/qw . USGS will publish the data in the new national annual data report. The report is published by water year on the internet. The reports will be published in a format similar to the water 2006 report found at http://web10capp.er.usgs.gov/adr06_lookup/search.jsp . The new national report is also available on the internet at the USGS web site http://pubs.usgs.gov/wdr/