V .
MS4 Screening and Illicit Discharge Inspections
The City of Arlington has implemented a Dry Weather Screening and Monthly Routine Screening program to locate portions of the MS4 with suspected illicit discharges and improper disposals . Results of screening efforts during this permit term as well as a more complete description of the program may be found in MCM 8 , Monitoring , Evaluation , and Reporting . The entire MS4 , but not necessarily each individual outfall , is screened at least once during the five-year permit term .
VI .
NPDES and TPDES Permittee List
The City of Arlington maintains an industrial and construction database containing a list of operators and construction sites that are located within the Arlington city limits . This database contains the name , location , and permit number ( when applicable ) that authorizes stormwater discharges from construction activities .
VII .
MS4 Map
The City of Arlington presently operates a system with approximately 3,597 storm sewer outfalls , 565 miles of storm sewer pipe , and about 18,791 inlets . In the previous permit term , the City implemented an asset identification and inventory program to track all MS4 assets . Unique identifiers are assigned to allow for efficient tracking of system conditions , inspections , and maintenance . The system is GIS based and integrates system inventory data into a system map . Outfall verifications , inlet and manhole locations , and storm sewer pipe identification are continuous processes .
VIII .
Spill Prevention and Response
The Hazardous Materials Response Team ( HMRT ) of the City ’ s Fire Department and Environmental Specialists provide spill response for hazardous material spills . The HMRT provides initial response and containment , while Environmental Specialists ensure removal of the spilled material in a manner that protects water quality . If the spill is minor ( i . e . is not of reportable quantity ), the HMRT will respond and perform the necessary removal actions themselves . There were no changes to the hazardous material spill response procedures during FY18 .
During the 2-IRP , the HMRT expended over 283 man-hours responding to 476 HAZMAT incidents . These are outlined below .
Type of Response |
Number of Responses |
Hazardous condition , other |
103 |
Combustible / flammable gas / liquid condition , other |
6 |
Gasoline or other flammable liquid spill |
35 |
Gas leaks |
266 |
Oil or other combustible liquid spill |
11 |
Toxic condition , other |
1 |
Chemical hazards |
10 |
Chemical spill or leak |
10 |
Refrigeration leaks |
4 |
Carbon Monoxide Incidents |
20 |
Radioactive condition , other |
5 |
Radiation leak , radioactive material |
0 |
Biological hazards , confirmed or suspected |
5 |
CITY OF ARLINGTON TPDES STORMWATER ANNUAL REPORT – FY 2018
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