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• <br /> ATTACHMENT <br /> THE TRANSMISSION STORE <br /> 515 CHARTER WAY,STOCKTON CA. <br /> SITE CODE: 9321 <br /> NARRATIVE WORK DESCRIPTION <br /> In February 1996 gasoline fuel contamination was discovered when one of two suspected Underground <br /> Storage Tanks (UST)were removed. It is unknown when one of the two suspected UST's and dispensers <br /> were removed from the site. The remaining UST was removed by Thorpe Oil of Lodi, CA in February of <br /> 1996. The tank removed contained what appeared to be waste oil. Both soil and groundwater were <br /> contaminated by the tank system leaks as the gasoline fuel apparently migrated both vertically and <br /> laterally. The full extent of impact has not yet been determined,however,the primary source as the UST's <br /> have been removed and the UST's have to the best of our knowledge not been used since the 1950's. The <br /> following actions were taken by EMCON which were selected to assist in the assessment and proposed <br /> clean-up of this unauthorized fuel release. All work was approved by San Joaquin County Public Health <br /> Services Environmental Health Division Local Oversight Program staff(PHS/EHD). <br /> Investigation activity and Reporting details: September 17, 1996 through February 24, 1997. <br /> EMCON observed the drilling of six soil borings B-1R through B-6R. <br /> B-IR, 10"borehole,depth 53' bgs <br /> B-IR completed as MW-1R with 30' of 2" Schedule 40 PVC slotted section and 22.5' of 2" PVC blank <br /> section <br /> Three soil borings B-3R through B-5R were converted to dual completion vapor extraction wells VW-1 <br /> through VW-3,and one soil boring was completed as a single vapor extraction well VW-4. <br /> B-2R, 10"borehole,depth 40.5' bgs <br /> B-3R, 8"borehole, depth 40' bgs <br /> B-3R completed as VW-1, a dual completion vapor extraction well with 12.5' & 12.5' of 2" Schedule 40 <br /> PVC slotted section from 10.5' to 23.0' bgs & 27.5 to 40.0' bgs respectively and 10.5' and 27.5' of 2" <br /> Schedule 40 PVC blank section. <br /> B-4R, 8"borehole, depth 40' bgs <br /> B-4R completed as VW-2, a dual completion vapor extraction well with 12.5' & 12.5' of 2" Schedule 40 <br /> PVC slotted section from 10.5' to 23.0' bgs & 27.5 to 40.0' bgs respectively and 10.5' and 27.5' of 2" <br /> Schedule 40 PVC blank section. <br /> B-5R, 8"borehole,depth 40' bgs <br /> B-5R completed as VW-3, a dual completion vapor extraction well with 12.5' & 12.5' of 2" Schedule 40 <br /> PVC slotted section from 10.5' to 23.0' bgs & 27.5 to 40.0' bgs respectively and 10.5' and 27.5' of 2" <br /> Schedule 40 PVC blank section. <br /> B-6R, 8"borehole,depth 40' bgs <br /> B-6R completed as VW-4, a single vapor extraction well completion with 20.0' of 2" Schedule 40 PVC <br /> slotted section from 20.0' to 40.0' bgs and 20.0' of 2"Schedule 40 PVC blank section. <br /> 1 <br />