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16 February 1999 i AGE-NC Protect No 97-0290 ' Page 5 of 11 casing extended to the surface The filter pack (No 3 Lonestar sand) was installed from 60 feet to approximately 37 to 38 feet bsg A 2 5 to 3 5 foot bentonite pellet plug was then installed above the filter pack and hydrated The wells were then grouted to near the surface with portland cement A ' water-tight, traffic-rated well box was then installed over the wells Probmgs P1 through P3 and borings 134 through B7 were backfilled from total depth to surface grade ' with portland cement The portland cement was installed in each well and boring using either a tremmie pipe or through the hollow-stem augers The well and boring locations are shown on Figure 2 3 5 LABORATORY ANALYSES OF SOIL SAMPLES ' Selected soil were samples analyzed for p Y • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Methods 5030 and 8015m, i • Volatile aromatic hydrocarbons (benzene, toluene, ethylbenzene and total xylenes, BTEX) with methyl tertiary-butyl ether (MTBE) in accordance with EPA Method 8020, and • Oxygenated compounds (di-isopropyl ether [DIPE], ethyl tertiary-butyl ether [ETBE], MTBE,tertiary-amyl methyl ether [TAME] and tertiary butanol [TBA]) in accordance with EPA Method 8260 Modified Soil samples from borings B4 through 137, MW6, MW7 and selected samples from probings P2 and P3 were also analyzed for • Total petroleum hydrocarbons quantified as diesel (TPH-d) in accordance with EPA Method 8015m Samples MW1-30, MW3-55 and 134-25 were transported under chain-of custody to Cooper Testing Lab in Mountain View These three samples were tested for • Percentage organics (total organic carbon) by ASTM Method D2974, • Specific gravity by ASTM Method D-854, and • Permeability and porosity by ASTM Method D 5084 Advanced GeoEmironmental,Inc