RESPONDENT VIOLATED SECTION 103(a) OF CERCLA BY FAILING TO IMMEDIATELY NOTIFY THE NATIONAL RESPONSE CENTER ( NRC ) AS SOON AS RESPONDENT KNEW OR SHOULD HAVE KNOWN THAT A RELEASE OF HAZARDOUS SUBSTANCE, NAMELY, CHLORINE, HAD OCCURRED AT RESPONDENT'S OUTDOOR POOL IN AN AMOUNT EQUAL TO OR EXCEEDING THE APPLICABLE RQ ON JUNE 19, 2014. ADDITIONALLY RESPONDENT VIOLATED SECTION 304(c) OF EPCRA BY FAILING TO SUBMIT A WRITTTEN FOLLOW-UP EMERGENCY NOTICE, AS SOON AS PRACTICABLE, TO UPDATE THE LOCAL EMERGENCY PLANNING COMMITTE ( LEPC ) AND THE STATE EMERGENCY RESPONSE COMMISSION ( SERC ) REGARDING THE JUNE 19, 2015 CHLORINE RELEASE.