Laserfiche WebLink
r rr <br /> The system was shut down on March 21, 1995 due to low influent hydrocarbon levels The A S I <br /> unit was replaced with a 160 SCFM regenerative type blower which extracts soil vapors from <br /> monitoring well MW-1B and filters the vapors through two in-line 200 lb carbon absorption <br /> filters pnor to atmospheric release The carbon absorption vapor extraction system was started <br /> on July 5, 1995 and operated continuously through August 4, 1995, at which time vapor <br /> hydrocarbons concentrations reached zero Currently, the vapor extraction system is in a pulse <br /> mode where the system will be pulsed on periodically to extract any remaining hydrocarbon <br /> vapors in the surrounding soils System operating data and calculations are contained in <br /> Attachment 3 A copy of the revised Air Permit is contained in Attachment 4 <br /> RECOMMENDATIONS <br /> All six on-site wells will be quarterly sampled for 3 more quarters If quarterly sampling results <br /> remain below laboratory detection hmits for TPH, as gasoline, and BTEX, Apex will then request <br /> site closure <br /> REPORT DISTRIBUTION <br /> Apex submitted copies of this report, in final form, to <br /> 1 Ms E Thayer <br /> Central Valley Regional Water Control Board <br /> 3443 Routier Road, Suite 'A' <br /> Sacramento, California 95827-3098 <br /> 2 Ms M Lagono <br /> San Joaquin County Environmental Health Invision <br /> Post Office Box 2009 <br /> Stockton, California 95201 <br /> 3 Mr Craig Mitchell <br /> San Joaquin Valley Unified Air Board <br /> 4230 Kiernan Ave , Suite 130 <br /> Modesto, California 95356 <br /> 3 <br />