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Second Quarter 1996 Groundwater Monitoring&Remediation Status Report <br /> Moore Petroleum, 14800 W Frontage Rd,Manteca,CA <br /> August 7, 1996 <br /> Page 5 <br /> ' The vapor extraction system has been operating at the subject site since January of 1995 and has <br /> extracted approximately 2,350 pounds{lbs} of TPH, as gasoline, and approximately 7 8 Is of <br /> benzene as of July 19, 1996 Since startup,the vapor extraction system extraction rates have <br /> reduced drastically from 31 pounds per day(lbs/day)in January of 1995 to less that 1 lb/day in July <br /> of 1996 Benzene concentrations in the extracted vapors have dropped off considerably and have <br /> ' been below laboratory detection limits for 2 months When benzene was detected in April and May <br /> of 1996, it was being extracted at an extremely low extraction rate of 0 0017 lb/day to 0 0077 <br /> ' lb/day Considering that the TPH, as gasoline, extraction rates have been less that 1 lb/day and that <br /> benzene has not been detected in the soil vapors for 2 months,it is no longer cost effective to <br /> remediate soil at the subject site through vapor extraction A natural attenuation method is abetter <br /> ' alternative to vapor extraction Therefore, Apex recommends shutting down the vapor extraction <br /> system at the subject site,too <br /> ' REPORT DISTRIBUTION <br /> Apex submitted copies of this report, m 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 Division <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 />