A STATE OF CONNECTICUT INTERDEPARTMENTAL REPORT DATED 11/13/1981 STATES THAT LEAKING SPENT 111-TRICHLOROETHANE (F001/F002) WAS OBSERVED FLOWING FORM BULK STORAGE DURING DEP's FIRST SITE INSPECTION ON APRIL 7, 1981. THE REPORT INDICATES THAT CHLORINATED SOLVENTS WERE STORED AT THE SIBLEY FACILITY, AND THAT RELEASES OF THESE SOLVENTS OCCURRED TO ON-SITE SOILS. A MAY 1982 REPORT PREPARED BY GERAGHTY & MILLER, INC. ENTITLED INVESTIGATION OF GROUND-WATER CONTAMINATION IN THE VICINITY OF THE SIBLEY COMPANY, HADDAM, CONNECTICUT INDICATES THAT ON-SITE GROUNDWATER HAS BEEN IMPACTED BY ON-SITE RELEASES OF CHLORINATED SOLVENTS. AVAILABLE INFORMATION INDICATES THAT THE FACILITY IS A PROBABLE SOURCE OF GROUNDWATER CONTAMINATION THAT HAS SPREAD OFF-SITE AND INTO DOWNGRADIANT RESIDENTIAL WELLS. THERE IS POTENTIAL FOR WORKER EXPOSURE TO VOLATILIZED CHLORINATED SOLVENTS INDENTIFIED IN SOILS AND/OR GROUNDWATER BECAUSE THESE SOLVENTS POSE A POTENTIAL VAPOR INTRUSION RISK TO BUILDING OCCUPANTS. RECENT INFORMATION FROM OTHER RCRA CORRECTIVE ACTION SITES INDICATES THAT VOLATILE ORGANIC COMPOUNDS (VOCs) PRESENT AT LEVELS NEAR MAXIMUM CONTAMINANT LEVELS (MCLs) BENEATH BUILDINGS MAY CONTRIBUTE TO VOC LEVELS IN INDOOR AIR IN SUCH BUILDINGS. SUCH LEVELS POSE AN UNACCEPTABLE RISK TO BUILDING OCCUPANTS.
GROUNDWATER DATA COLLECTED BY SIBLEY AND THE CONNECTICUT DEP OVER THA APPROXIMATE PERIOD OF 1981 THROUGH 1999 INDICATE THAT NUMEROUS PROPERTIES IN THE HADDAM BRIDGE ST AREA ARE CONTAMINATED WITH