Alameda Countywide Clean Water Program Stormwater Quality Monitoring and Creek Status Bioassessment Monitoring

A site visit was performed with the client, plant operator and ADH staff to discuss plans on how to monitor the pump station with minimal effects on plant operations.
ADH staff performing on-site manufacturing of state-of-the-art non-contaminating pump station sampling equipment
Reference stream gauging performed to calculate ambient loading calculations
Prime Contractor: 
Period of Performance: 
August, 2011
Project Description: 

The State of California, through the San Francisco Bay Regional Water Quality Control Board, issued a Municipal Regional Stormwater NPDES Permit (MRP) to Alameda County, which specifies pilot monitoring projects and special studies to address pollutants of concern in stormwater runoff. Monitoring provisions of the MRP allow for regional collaboration to coordinate and conduct monitoring activities. The Alameda Countywide Clean Water Program (ACCWP) is a part of a regional collaborative known as the Bay Area Stormwater Management Agencies Association (BASMAA) Regional Monitoring Coalition.

Scope of Services: 

 

ADH Environmental, as a subcontractor, has implemented monitoring requirements of the MRP on behalf of Alameda County, including the following:

San Leandro Creek – Stormwater Pollutants of Concern and Long-Term Trends Monitoring

ADH operates and maintains a sophisticated stormwater monitoring station on the bank of San Leandro Creek in the City of San Leandro. The station’s monitoring equipment includes:

  • Three ISCO 6712 peristaltic pump samplers
  • Pressure transducer depth sensor
  • Anti-fouling turbidity sensor and sample intake tubing mounted to dynamically positioned sampling boom
  • Programmable logic controller/datalogger
  • Telemetry hardware
  • Rain gauge
  • Solar panel and 12-volt power supply

The monitoring system is configured to collect fully-automated, whole-storm, flow-weighted or time-paced composite samples. In addition to automated composite sample collection, ADH field crews are mobilized to the site during storms to collect four rounds of manual grab samples to coincide with peaks in runoff turbidity. This sample collection, including “clean hands/dirty hands” methods for low-level mercury collection, may occur at any hour of the day or night. ADH management personnel remotely monitor real-time stage and turbidity levels, so that field crews may be dispatched for the timely collection of grab samples and empirical observations, and to service monitoring equipment as needed. Additionally, ADH has performed USGS-approved stream gauging methods on San Leandro Creek to develop a rating curve that will be used to calculate pollutant loading.

Ettie Street Pump Station Stormwater Diversion Pilot Project

The MRP requires permittees to implement control measures on a pilot scale to determine effectiveness and technical feasibility for reducing the discharge of TMDL parameters (PCBs and mercury) to the San Francisco Bay. ADH designed, configured, installed and currently operates a remote-controlled, semi-automated stormwater sampling and monitoring station at the Ettie Street pump station located in the City of Oakland.

This monitoring station allows for the collection of turbidity triggered stormwater samples, logs time-series turbidity data and incorporates state-of-the-art non-contaminating system components and sampling equipment. ADH installed the equipment with rigorous adherence to confined-space entry procedures consistent with 29 CFR 1910.146. The monitoring station also incorporates a 600-gallon stainless-steel holding tank for settling BMP effectiveness testing. As PCBs and mercury are heavily associated with particles, settling is a primary step in pollutant reduction. The aqueous contents of the holding/settling tank are designed for diversion to the East Bay’s POTW, or as influent for media filters to be installed in a later phase of work.

Guidance Documents – Stormwater Pollutants of Concern and Long-Term Monitoring

ADH prepared major portions of a field guidance manual for all BASMAA permittees and monitoring contractors who will perform stormwater pollutants of concern sampling and monitoring. This manual addresses a wide range of topics, including health and safety procedures; hardware installation; equipment programming; site and equipment operation and maintenance; storm monitoring activities; laboratory coordination; field data management; and quality assurance and quality control.

Creek Status Bioassessment Monitoring

Creek status investigations are conducted annually at twenty tributaries to San Francisco Bay within Alameda County. These surveys include benthic macroinvertebrate sampling and analysis; physical habitat assessments; algae sampling and analysis; stream-walk surveys; water-quality instrument deployments; and sampling for water quality parameters, water toxicity, sediment toxicity, and pathogen indicators. ADH staff manages and participates in all phases of the creek status monitoring activities.

Sample intake tubing mounted to dynamically positioned sampling boom on the bank of San Leandro Creek