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T Mr. Harlin Knoll August 25, 1998 Page 3 • Subsequent to drilling, the borings were backfilled using neat cement The neat cement was placed through a trenue pipe to the total depth of each boring The groundwater displaced by the backfilling was contained in DOT-approved 55-gallon drums and labeled Litholosv Souls encountered at the site consisted of interbedded clay, silt, sand and gravel The upper 50 feet of soil is predominantly snit and clay with a 7-15 foot thick sand/gravel layer encountered beginning at approximately 18-20 feet bgs It should be noted that these bonungs were advanced through native maternal that has been excavated (to approximately 35 feet bgs), aerated, and subsequently backfilled/compacted Soil from approximately 50 to 70 feet bgs had a greater proportion of poorly graded sand/sdty sand except for boring DB-3, where only a 2-3 foot sand lens was logged Soni below 70 feet (DB-la only) consisted of clays and silts, with a 34 foot thick sand layer at approximately 95 feet Boring logs are included in Attachment C Groundwater was first encountered in borings DB-1 a, DB-2, and DB-3 at depths of 42 5, 39 5, and 43 feet bgs, respectively Soil Sample Analysis Slight to strong petroleum odors were noted in soil samples collected from DB-1/DB-1a from 35 to 70 . feet bgs Corresponding FID readings vaned from greater than 10,000 parts per million (ppm) between 35 and 50 feet bgs, 700 to 5,000 ppm from 55 to 65 feet bgs, and 80 ppm at 70 feet bgs Soil samples from DB-1/DB-1a at depths of 35 5, 45 5, 66, 80, and 98 5 feet bgs were submitted for laboratory analysis Slight to strong petroleum odors were noted in soil samples collected from DB-2 from 45 to 65 feet bgs, and corresponding FID readings ranged from 500 to 2,000 ppm between 45 and 55 feet bgs, and 4 5 ppm at 65 feet bgs Soil samples from DB-2 at depths of 35 5, 46, 55 5, 60 5, and 70 5 feet bgs were submitted for laboratory analysis Slight to moderate petroleum odors were noted in soil samples collected from DB-3 from 45 to 70 feet bgs Corresponding FID readings vaned from greater than 10,000 ppm at 45 feet bgs, between 100 to 500 ppm from 50 to 55 feet bgs, and 0 to 20 ppm below 60 feet Soil samples from DB-3 at depths of 36, 46, 50 5, 60 5, and 70 5 feet bgs were submitted for laboratory analysis Boring logs with FID readings are included in Attachment C Samples were submitted under chain of custody to Argon Laboratory and analyzed for total petroleum hydrocarbons as gasoline (TPHg) using modified EPA method 8015, and benzene, toluene, ethylbenzene, and total xylenes(BTEX)using EPA method 8020 Additionally, samples from DB-1 at depth of 66 and 98 5 feet bgs were submitted to McCampbell Analytical and analyzed for volatile organic compounds(VOCs) and gasoline oxygenate additives using EPA method 8260 Groundwater Sample Analysis The grab water samples were submitted under chain of custody documentation to Argon and analyzed for TPHg and BTEX using the methods outlined above kWwIc&hamk orL%'Vn rMdw