Client Successes

Case Study - Immediate Response Action Plan

The subject property is located in a mixed residential/commercial area of a Massachusetts town. The Site is presently operated as a Petroleum Plant branded gasoline service station. According to the Board of Health no private or public drinking water wells are located within 500 feet of the site and the site is not located within a local Aquifer Protection District. The site is supplied by a municipal water supply.

The Site property is approximately rectangular, and is located on the south side and residential properties are located to the north and east of the Site. Commercial properties are located west of the site. A wetland area abuts the site to the south. A one-story service station, a pump island, an underground storage tank (UST) field and pavement occupy the majority of the site.

A total of three 4,000-gallon UST's were removed from the site. During the UST removals a total of 350 cubic yards of petroleum contaminated soil were excavated and stockpiled on site. Approximately 400,000-gallons of water were pumped and treated during the UST removal activities. CEA submitted a Final Report and Summary of Analytical of Treated Groundwater Discharge to the EPA.

CEA personal gauged and sampled existing monitoring and gauged tank pad observation wells. We believe that all other wells have been destroyed. During this event petroleum (NAPL) was detected and triggering a 72-hour reportable condition. Department of Environmental Protection was orally notified of the reportable condition and assigned a RTN number to the reportable condition. At that time oral approval was granted to bail NAPL from the wells on a periodic basis; Install passive NAPL recovery bailers in the wells; and to conduct assessment activities to help define the source and extent of the NAPL.

The primary objectives of the IRA are: to reduce separate phase petroleum levels to less than ½ inch; to identify the source of the separate phase petroleum; and to define the extent of separate phase petroleum. The soil borings were advanced; utilizing a standard Earthprobe rig mounted using the vibratory direct push sampling technique. The Earthprobe advanced a 2-inch diameter hollow core bit in four-foot intervals to an average depth of twelve feet or to refusal.

All samples were field screened for Total Organic Vapors (TOVs) with a photoionization detector (PID) equipped with a 10.2 eV bulb calibrated to benzene standard. The TOV readings were measured using the DEP soil gas headspace technique. Field results ranged from 80 parts per million by volume (ppmv) to greater than 200 ppmv.