A cable installation crew penetrated a subsurface 24” diameter gasoline pipeline immediately north of Route 332 in Newtown, PA. Because the pipe was ‘charged’ (transmitting gasoline) approximately 50,000 gallons of gasoline was release before the flow was stopped. CEMCO personnel were involved in the emergency response to the spill and subsequent clean up efforts that lasted 9 years. Within two months gasoline fumes were evident and measurable in 13 of the homes south of Route 332. Each of these homes was fitted with sub-slab Vapor Mitigation system to eliminate the entry of gasoline vapors. In addition to the typical piping and negative pressure fan system each system was equipped with battery backup for continued operation in the event of power discontinuation as well as audible alarms to detect and trigger if vapor levels in the system reached 10% of explosive levels.

Over the 9 year fuel recovery and groundwater bio-remediation remediation program the vapor mitigation systems were gradually removed as the area of impact receded. During this time period regular in house and sub-slab sampling and analysis of air was conducted to ensure the effectiveness of the systems. Prior to system removal CEMCO personnel performed testing to confirm three consecutive months with no detectable vapors sub-slab or in the house.