Limetree Bay monitoring proposal
EPA reviewed the Limetree Bay Terminals and Refining Environmental Justice Analysis Modeling Report dated June 2019.  EPA is proposing the following monitoring requirements based on the information provided in the report and previous HOVENSA monitoring activities.
SO2 Monitoring
 Operate and maintain SO2 ambient air monitoring stations at 5 locations.  4 of these stations were formerly operated by HOVENSA.  A new station should be located in the approximate area of highest SO2, NO2, and PM2.5 modeled concentrations.  The new station is named "PEAK" in the tables and figures that follow.   All the stations should continuously monitor for SO2.
                         EJ Modeling Report Station #
                                    Address
                                      Lat
                                      Lon
                                       1
                       WEST GATE MARTIN MARIETTA ALUMINA
                                    17.7050
                                   -64.7801
                                       3
                         PLOT 25, ESTATE CLIFTON HILL
                                    17.7205
                                   -64.7763
                                       4
                          PLOT 487 ESTATE BARREN SPOT
                                    17.7325
                                   -64.7829
                                       5
                             PLOT 214 ESTATE RUBY
                                    17.7397
                                   -64.7515
                                     PEAK
                                       
                                    17.7206
                                   -64.7537

NO2 Monitoring
 Operate and maintain NO2 ambient air monitoring at 2 locations.  The stations should continuously monitor for NO2.
                         EJ Modeling Report Station #
                                    Address
                                      Lat
                                      Lon
                                       1
                       WEST GATE MARTIN MARIETTA ALUMINA
                                    17.7050
                                   -64.7801
                                     PEAK
                                       
                                    17.7206
                                   -64.7537

PM2.5 Monitoring 
 Operate and maintain PM2.5 ambient air monitoring at 1 location.  The station should continuously monitor for PM2.5.
                         EJ Modeling Report Station #
                                    Address
                                      Lat
                                      Lon
                                     PEAK
                                       
                                    17.7206
                                   -64.7537
   
Locations of Monitoring Stations
Figure 1 shows the approximate locations of proposed monitoring sites.  The figure is a modified version of a figure included in the Limetree Bay Terminals and Refining Environmental Justice Analysis Modeling Report.  The location marked off with a "P" indicates the area where modeled peak concentrations of SO2, NO2, and PM2.5 were identified.
   
Figure 1 Proposed ambient air monitoring stations
Monitoring Data
 Monitoring data should be uploaded into EPA's Air Quality System (AQS) 
Meteorological Tower
 Operate and maintain a meteorological tower.  The meteorological tower can be located at one of the monitoring sites or at an individual site such as the former Cottage Meteorological Station.

