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L <br /> r.. Well Destruction Work Plan Advanced Environmental Concepts,Inc. <br /> V <br /> excavations were based on the same criteria and continued until all indicsations of contaminated soil had been <br /> removed. <br /> �+ AEC performed the excavation procedures using a track-mounted excavator and a front loader. A total <br /> estimated volume of 3,490 yds' of soil was excavated during the course of this project. Of this volume, <br /> approximately 935 ydS3 of gasoline-impacted soil and 27 yds' of diesel-impacted soil were excavated and <br /> a. removed for treatment on an adjoining parcel; approximately 2,528 total yds' of "clean" overburden was <br /> excavated and stockpiled separately in order to allow access to the deeper contaminated soil horizon. (These <br /> volumes were excavated from two separate UST emplacements of the following approximate dimensions: <br /> Diesel Pit-12 feet wide, 15 feet long, soil removed from average depth of 8 to 12 feet BGL; Gasoline Pit: 50 <br /> �+ feet wide, 130 feet long, soil removed from depths ranging from 4 to 16 feet BGL. The impacted soil was <br /> primarily located in the zone of the capillary fringe and excavation effectively served as "source removal"to <br /> attenuate continued degradation of groundwater quality from gasoline. Sidewall and floor samples were <br /> collected and analyzed in order to confirm the complete removal of contaminated soil. <br /> The October 1997 samples were analyzed by Associated Laboratories,a certified laboratory located in Orange. <br /> The July 1998 samples were analyzed by Baseline On-Site Analysis,a certified laboratory located in Huntington <br /> Beach. Analytical results of these confirmation samples are presented in Tables 1 thru 4. <br /> TABLE -1 <br /> w Analytical Results -Confirmation Samples - Diesel Pit Area <br /> 10106/97 <br /> (ppm) <br /> w.. <br /> CONSTITUENT TPH-D MTBE BENZENE TOLUENE ETHYLBENZENE XYLENES <br /> SAMPLE I.D. <br /> DSL-12' ND ND ND ND ND ND <br /> DSL-E-10' ND ND ND ND ND ND <br /> rr DSL-N-11' ND ND ND ND ND ND <br /> DSL-S-11' ND ND ND ND ND ND <br /> `r DSL-W-11' ND ND ND ND ND ND <br /> DETECTION 10 .005 .005 .005 .005 .015 <br /> LIMIT <br /> V <br /> V <br /> Protect: AEC 98V-1960 2 <br /> w <br /> -ENVIRONMENTAL CONCEPTS WITH DESIGN IN MIND - <br /> 4400 ASHE ROAD.#206 • BAKERSFIELD.CA 93313 805/831-1646 FAX 805/831-1771 <br /> it <br />