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�GRO Jeff Granberry September 26, 1995 ( 9447-8620) 4 0 MI'T'IGATION SUMMARY The following is a summary of the volume of petroleum hydrocarbons removed from the site using SPH removal, VES, and soil overexcavation 4.1 Fme Product and Soil Vapor Extraction Summmy The removal of hydrocarbons from the site began on December 8, 1994, when an estimated 700 gallons of free product was removed by vacuum truck An additional total of an estimated 122 gallons of free product was removed by vacuum truck on December 10, 11, and 13, 1995 Thus, the cumulative total of product removed by vacuum truck is estimated to be 822 gallons Free product has also been removed from the site by hand bailing wells RW-1, MW-1, and MW-5 The bailing operation was carried out on a routine basis and almost all of the bailing was done on well RW-1 The total amount of free product removed by hand bailing is estimated to be 449 gallons The total amount of free product removed by both vacuum truck and well- bailing is estimated to be 1,271 gallons • A VES, consisting of an internal combustion engine (IC engine), begun operation on December 13, 1994 and was shut off on May 1, 1995 The system was operated for a total of 2,631 hours during this period, on a 24-hour basis for most of the time Notable exceptions are when the system was off for the days from December 18 to the 24, 1994, and when the system was operated only intermittently for the days from January 27 to February 8, 1995 Approximately 1,449 gallons of petroleum hydrocarbons were removed using the VES The following table summarizes the calculated volume of petroleum hydrocarbons removed from the site by free product recovery and soil vapor extraction Table A Petroleum Hydrocarbons Removed (Gallons) By Vapor 1✓vtrauh0n and Fme Product Recovery Date Free Pmduct Soil Vapor Total 1/1/95 989 351 1,340 2/1/95 1,042 648 1,690 3/1/95 1,113 1,1 l 8 2,231 4/1/95 1,203 1,316 2,519 5/1/95 1,271 1,449 2,720 ` r 94478620 ARP 9 -