NDOT’s final revised Stormwater Monitoring Plan was approved by the Nevada Division of Environmental Protection on June 20 , 2019 .  
   The Plan outlines the NDOT’s efforts related to monitoring the water quality of stormwater runoff through August 9th , 2023 .  
   NDOT has made changes to the plan since it was originally approved . All changes have also been approved by NDEP .  
   What Are The Goals of NDOT’s Stormwater Monitoring Plan? 
   The goals of NDOT’s stormwater monitoring plan are to assist in making decisions about program compliance , the appropriateness of Best Management Practices ( BMPs ) , and progress toward achieving identified measurable goals ( which are detailed in NDOT’s Stormwater Management Program ( SWMP ) ) .  
   The goals of the stormwater monitoring plan are identified in Section B . 6 . 1 . 1 of the MS4 Permit and includes an evaluation of the following areas:  
   How monitoring may assist in making decisions about program compliance 
   The appropriateness of identified best management practices 
   Progress toward achieving identified measurable goals
   The principal monitoring strategies that are used to achieve the plan goals include:  
   Runoff Characterization:
   The plan includes characterizing runoff from NDOT’s roads as well as maintenance yards . The goal of this effort is to learn how variables such as asset type , maintenance practices , traffic numbers , terrain , seasonal changes , population density , and surrounding land uses affect the types and concentrations of runoff pollutants throughout NDOT’s MS4 Permit area . Understanding the characteristics of stormwater runoff from NDOT’s MS4 and assessing trends in stormwater quality will help the department evaluate the effectiveness of our SWMP .  
   Assessment of BMP Effectiveness:
   BMP effectiveness monitoring measures the performance of stormwater management strategies and informs the department if improvements need to be made .  
   Receiving Waters Characterization Monitoring:
   Receiving water monitoring is conducted to understand how stormwater runoff affects the water quality of the receiving water .
   How Does NDOT Conduct Stormwater Monitoring? 
   For monitoring efforts conducted solely by NDOT , a minimum of 15 total monitoring events is typically targeted throughout the study duration so that the monitored runoff events cover a diverse set of conditions and situations . The first storm of the wet season is targeted for monitoring to account for the buildup of pollutants during the dry season . Ideally , after a successful sampling of a storm event , a dry period of 10 days should occur before another runoff event is sampled .  
   During all site visits NDOT collects instantaneous measurements , which are collected every 5 minutes whenever the water quality sensors are submerged in stormwater runoff: conductivity , discharge , stage , turbidity , and water temperature .  
   Autosamplers collect flow - weighted composite samples during runoff events that are submitted to a lab for analysis . Autosamplers collect flow - weighted composite samples during runoff events that are submitted to a lab for analysis .  
   Water quality samples ( runoff dependent ) : 
   Conductivity
   Nitrate
   Nitrite
   Ortho - phosphate
   Total dissolved solids
   Total Kjeldahl N
   Total N
   Chloride
   Copper
   Cadmium
   Chromium
   Lead
   Iron
   Nickel
   Manganese
   Hardness
   Total P
   Total Suspended Solids
   Turbidity
   

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