DTC was retained by TAG Associates, Inc. to conduct Phase I and Phase II Environmental Site Assessments (ESAs) and a Hazardous Building Survey for a portion of the Riverside Apartments property located on Olson Drive in Ansonia, Connecticut.

The Riverside Apartments site encompasses a total of approximately 10 acres. DTC’s ESAs and Hazardous Building Survey focused on the 5-acre portion of the site, west of Olson Drive and south of High Street.

Prior to the early 1960’s, “junk storage” areas, an auto repair shop, New Systems Laundry, and an auto repair and wrecking business were located on the subject site. During the early 1960s, the subject site was filled with material of unknown quality, prior to construction.

At the time of DTC’s investigations, the subject site was occupied by seven buildings including five three-story, masonry and brick, apartment buildings, a Service Building, and a Community Center, which were constructed in the early 1960s. Two USTs containing fuel oil were formerly located on the property, and an historic (1970s) fuel oil release was reported to have occurred in the boiler room.

DTC identified seven Areas of Environmental Concern (AOCs) and developed and implemented a Phase II investigation. The Phase II scope of work included the ground-penetrating radar (GPR) and utility locating survey, the advancement of 14 soil borings, the completion of four hand auger borings, and collection of 34 soil samples for laboratory analysis.

Releases of extractable petroleum hydrocarbons (ETPH), polynuclear aromatic hydrocarbons (PAHs), lead, and arsenic were identified in fill material at the site. DTC recommended a Phase III ESA be completed in order to further delineate the horizontal and vertical extent of contaminants throughout the subject site.

Mystic Air Quality, Inc. (Mystic) of Groton, Connecticut was subcontracted to complete the Hazardous Building Survey, which included a pre-demolition level survey of asbestos and lead-containing building materials of one of the vacant buildings. Mystic’s scope of work included obtaining 120 bulk samples and analysis for asbestos by polarized light microscopy (PLM), and collection and analysis of five lead waste characterization samples by the TCLP method.

Asbestos was detected in the floor tile, exterior caulking (expansion joints & on seams of decking), and fittings above the ceiling in the TSI/Furnace Room Closet. Several other suspect materials were also noted. Based on the analytical data, the exterior window & entrance door lintels were considered to be lead painted.