AT THE TIME OF THE CEI IN NOVEMBER, 2006, AND DURING THE SUBSEQUENT INVESTIGATION BY EPA, RESPONDENTS COULD NOT DEMONSTRATE THAT TWO USTS AT THE FACILITY HAD VEEN MONITORED EVERY THIRTY DAYS FOR RELEASE DETECTION AS REQUIRED BY 20 DCMR SUBSECTION 6003 FOR THE TIME PERIOD JULY 1, 2003 THROUGH NOVEMBER 15, 2006.