Baltimore City Department of Public Works

[Pages:18]Baltimore City Department of Public Works

Baltimore City Department of Public Works

Chasing Compliance: Baltimore's Use of IDDE Methods for Bacteria Reduction

Van Sturtevant and Bilal Sarayra Department of Public Works City of Baltimore

June 2016

Baltimore City Department of Public Works

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Bacteria TMDLs for Baltimore

Watershed Back River (Herring Run) Gwynns Falls

Jones Falls Lower N. Branch Patapsco

? Capital infrastructure improvements

? Traditional, ESD, and Alternative BMPs

? Septic system improvements

? Preventive maintenance ? Education ? IDDE

Issue Date 2007 2007 2008 2009

Pollutant E.coli E.coli E.coli E.coli

MS4 Baseline Load 5,860,942

98,157

8,608

5,393

WLA 214,920

322 314 3,902

Units

Billion MPN/year

Billion MPN/day

Billion MPN/day

Billion MPN/year

Description Annual Avg.

% Reduction

96.3%

Daily

99.7%

Daily

96.4%

Annual Avg.

27.6%

Baltimore City Department of Public Works

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Baltimore's Stormwater System

Collect

53,716 inlets

Convey

1,208 miles pipe

Discharge

285 Harbor outfalls

Clear water connections

116 miles stream

1,424 other outfalls

Baltimore City Department of Public Works

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DPW Operations for IDDE

? 14 positions ? 1 supervisor ? 8 field ? 1 data mgt. ? 4 vacant

? Scientists and engineers, min. bachelors degree

? $2.0 M / year budget

? 3 funding sources ? Some private

partnerships and volunteer programs

? Weekly field screening at over 80 locations

? FY 2015: 244 pollution source tracking (PST) investigations

Stream Impact Sampling Chemical & Biological Assessment 311 Response SSO Abatement Confirmation ERP SSO Sampling Flood ALERT Management Education

Baltimore City Department of Public Works

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Assessing Pollutant Reductions

Field Screen

PST Investigation

Identify Source*

*TKN Ammonia - N Nitrate-nitrite-N

Bacteria

Confirm Abatement*

Abate Source

Baltimore City Department of Public Works

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Field Screening & PST

Baltimore City Department of Public Works

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Traditional Dye Testing

1. Single dye deployment here

SAN

S01

S02

S03

ST

D13

D11

2. Dye viewed

Method One-point-repair Lining *

Cost $7,800 $18,000

here within a short timeframe.

Pipe Bursting*

$60,000

* Assumes 400 LF pipe segment.

Baltimore City Department of Public Works

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