Site 22 – Former Building 105 Old Dry Cleaning Facility
Former Building 105 operated as a dry cleaning facility between 1939 and 1993. VOCs may have been discharged to the sanitary and storm sewer systems during the facility operations or as a result of occasional spills. From 1993 or 1994 until February 2001, the building was used to warehouse and repair vending equipment and products. The vending machine supply and repair operations ceased in February 2001, and the building was vacant until it was demolished in March 2003 and replaced by an asphalt parking lot with a high-density polyethylene (HDPE) liner. The site is now an active, paved parking lot.
Hazardous waste/materials associated with the dry cleaning facility, typically containing tetrachloroethene (PCE), were stored inside the building between 1980 and 1987. The quantity of waste/material stored in Building 105 is unknown. According to the revised RCRA permit for the site, the maximum amount allowed to be stored at one time was 165 gallons (i.e., three 55-gallon drums). The storage area consisted of the concrete floor of the building adjoining the concrete block exterior wall along the eastern side of Building 105. There were no berms or curbs associated with the storage area. Several floor drains were located near the storage area. According to historical foundation plans, these drains were connected to the storm sewer system outside the building. The building foundation plans depicted two 6-inch drains under the washing machines in Building 105. The drains were connected to a grease catch basin outside the southeast corner of the building. The catch basin was approximately 5 feet by 7.5 feet by 5.5 feet deep. It included two chambers and had a 6-inch tile effluent pipe. The effluent line may have been connected to a manhole outside the building along Sampson Street, and ultimately to the waste water sewer lines for Naval Station Great Lakes.
Current land use of Site 22 as a parking lot is not expected to change in the foreseeable future. The parking lot currently serves personnel in the fire station (Building 106), post office (Building 112), gymnasium (Building 4), security administration (Building 6), staff barracks (Building 178), and clinic (Building 237).
The former dry cleaning operations conducted at Site 22 are believed to be the primary source of soil and groundwater contamination at the site. PCE was used as part of the former dry cleaning operations, and was stored in an AST. In addition, drums containing waste PCE were stored in a RCRA storage unit located inside of Building 105. Soil and groundwater contamination can be attributed to occasional spills during facility operations, discharges to storm sewers, and/or damaged/leaking sanitary or storm system facilities.
Soil and groundwater impacts were delineated through a series of phased investigations that occurred from 2001 through 2004. PCE and cis-1,2-dichloroethylene (DCE) were identified as the COCs in site soil and groundwater. Impacted soil was identified to a maximum depth of 30 feet below ground surface (bgs), with the highest concentrations occurring between 7 and 20 feet bgs nearest the former grease catch basin. Groundwater impacts were limited to shallow depths adjacent to the former grease catch basin. The major source area was estimated to be 625 square feet, encompassing a volume of approximately 600 cubic yards.
An interim remedial action for Site 22 consisted of a focused electrical resistance heating (ERH) study, implemented in 2006, which was successful in reducing soil contaminant concentrations. However, contaminants remain in place at concentrations exceeding criteria that allow for unrestricted use. The Site 22 ROD was signed in 2008. An engineered barrier (an impermeable liner and asphalt pavement) was installed in 2009 that prevents direct contact with residual contaminants. LUCs were implemented in 2009 to restrict future use of the site to industrial/commercial scenarios, prohibit installation of groundwater wells other than for environmental sampling, and require annual inspections of the site to make sure LUCs are continuing to be implemented. The remedy in place continues to be protective of human health and the environment. In addition, construction activities and intrusive work of any kind at the site must be forwarded to the Naval Facilities Engineering Command (NAVFAC) Environmental Business Line Core for review, certification, and approval in accordance with the LUC Implementation Plan and Base Master Plan. The approval process is to ensure worker safety as required under state and federal regulations.
Previous investigations, plans and documentation for this site are: RI/RA; FS; ERH Treatability Study (Interim Remedial Action); PP; and a ROD.
LUCs have been implemented at this site.