Storm Drain Monitoring Program Overview

Greg Stabach and Kim AdamsRogue Valley Council of Governments

January 21st, 2015 Rogue TMDL Meeting

Presentation OverviewStormwater management overview and

program contextMonitoring program summary ResourcesQuestions

Stormwater Runoff

Problems- Things we see

Stormwater ManagementClean Water Act under the NPDES Phase II MS4

Program (Bear Creek) and/or TMDL Programs (Rogue Basin).

Why stormwater management components were in 5-year plans.1. Public Education and Outreach2. Public Involvement and Participation3. Illicit Discharge Detection and Elimination4. Construction Site Runoff Control (Erosion

Prevention and Sediment Control)5. Post Construction Runoff Control6. Pollution Prevention/Good Housekeeping

Illicit Discharge Monitoring Program

Under the Bear Creek TMDL ProgramStorm Drains and Hot Spot

Illicit Discharge MonitoringDry Run First Flush

• Illicit discharge monitoring involves sampling storm drains three times annually in each DMA

• Dry weather– Evaluates contributions from existing water sources.

• Two storm events (flushes)—Evaluates contributions built up in the system.

Sample Sites

Sample Site Selection16 sampling locations, plus QA/QC Sites.

Based on discussions with local communities (public works and planning).

Areas of high urbanization (drainage significant portions of the City/County), specific areas of interest.

Can modify the sites annually as needed.

Adventures of stormdrain samplingMeandering Creeks

Battle with blackberries

Adventures of stormdrain samplingMan holes Under a bridge culvert

Raccoon habitat expert

Parameters Monitored

E. coliTurbidityTemperaturepHBiological Oxygen DemandConductivityTotal PhosphorusOther - Total petroleum hydrocarbons in the

diesel range (TPH-DxR)

Field TestsConductivity and

TemperatureTurbidity

Laboratory TestsBiological Oxygen

DemandE. coli

Water Quality Standards

Fecal Coliform 4 E. coli

200 cfu1 (median value) 10%samples > 400 cfus

126 E. coli/100 ml average 406 E. coli/100 ml absolute

June 1- Sept. 30

200 cfu1 (median value)

Same values Oct. 1 - May 31

Temperature*

64o F2

Flow Modification

No numerical standard

No numerical standard

Table 1-1: Water Quality Standards Based on the 1992 TMDL Requirements

Parameter Covered Under 1992 TMDL

Low Flow

(summer season) May 1-Nov 30

High Flow

(winter season) Dec 1-April 30

Ammonia as Nitrogen

0.25 mg/l

1.0 mg/l Biological Oxygen Demand

3.0 mg/l

2.5 mg/l

Dissolved Oxygen

8.0 mg/l or 90% saturated3

11.0 mg/l or 90% saturated3 Total Phosphorus

0.08 mg/l

0.08 mg/l

Monitoring Results

Results from the monitoring are used to evaluate the relative contribution of storm drain inputs to stream water quality.

Used for additional investigations depending on results – additional system monitoring, referrals to local jurisdictions.

On RVCOG Monitoring website - http://rvcog.org/mn.asp?pg=NR_WQ_Monitoring

Percent Exceedance by Sample Type for BOD, E. coli, and P

ResourcesHot Spot Contact ListWebsites

RVCOG Stormwater 101 -

http://rvcog.org/MN.asp?pg=NR_Stormwater_General

Stream Smart- http://www.stream-smart.com/Others –

http://www.cleanriversandstreams.org/ Stormwater Advisory Team (SWAT)

Meetings 10:00-11:30 a.m.

Questions