ARCHIVED REPORTS_XR0003214 - Laserfiche WebLink

Home Browse Search

� v a i � A S S o C I A T E S I N C groundwater being generated during extraction of vapor from the vapor wells Subsequent system modifications were made as described in Section 5 3 ' During the week of Feb 10, 2003 ATC personnel installed a Gast 2567-P1 - ��rY � p 32 T908X rotary vane compressor to operate the air sparge component of the system The compressor is capable 1 of creating a maximum of 20 pounds per square inch pressure and a maximum airflow rate of 18 standard cubic feet per minute ' 5.3 Groundwater Treatment and Discharge Equipment During initial start up of the vapor extraction system, approximately 25 gallons of groundwater per hour was extracted from the four vapor wells ATC closed the valves on vapor extraction wells V W 1 and V W2 and only extracted vapors from vapor wells V W3 and V W4, which are 1 screened approximately two feet above the current water level Seven gallons of groundwater per hour was extracted from vapor wells V W3 and V W4 1 ATC contacted the City of Stockton Department of Municipal Utilities (DMU) and submitted the necessary permit application information for the discharge of treated groundwater The DMU issued the Groundwater Discharge Permit (GDP) on November 6, 2002 Following the issuing of the GDP, approximately 50 feet of 3-inch diameter, ABS pipe was placed on the surface of the site from the remediation compound to a discharge point Iocated inside the bathroom of the on- site building The ABS pipe was connected to the existing sewer discharge line by a California 1 Licensed Plumber during the week of November 25, 2002 To operate the vapor extraction system, ATC modified the vapor extraction system to include the treatment and discharge of the groundwater during operation of the vapor extraction system to the City of Stockton sewer system The extracted groundwater is separated from the extracted vapor in a 50-gallon knockout tank located on the thermal oxidizing unit The knockout tank is equipped with water level sensors and when the knockout tank is approximately 80% full of groundwater, a transfer pump pumps the water from the knockout tank into a 1,000-gallon poly drop tank that is also located inside the remediation compound The drop tank is equipped with water level sensors and when the drop tank is approximately 80% full of groundwater, a second transfer pump pumps the water from the drop tank through the carbon filtration system The transfer pump stops ' pumping when the drop tank is reduced to 55% capacity The carbon filtration system includes three 200-pound ASC200 carbon vessels containing liquid- phase granular activated carbon The three ASC200 carbon vessels are connected in series by a hose connection system The activated carbon has an efficiency of 99% The three carbon vessels ' are setup in series with sampling ports before the first carbon vessel, in between each vessel, and after the third vessel 1 Components of the groundwater treatment system located in the remediation compound include the knockout tank on the thermal oxidizer from the vapor extraction system, one 1,000-gallon drop w lwordpro1625961reponshrp doe 6