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i • Site Background Information Chapin Brothers Investements, Inc Page 7of12 air spargmg flow rate ' The SVE unit operated at varying rates during the observation period Extraction flow rates were calculated to range from 150 to 200 scfm Typically operation averaged at 150 scf n during the ' period Operation of the unit was attempted at 200 scfrn, the maximum operational rate of the unit, however the unit was noted to overheat and automatically shut off apparently to prevent the catalyst beds from deteriorating An induced vacuum(negative pressure)of approximately 25 to 45 inches of water was measured in the piping between the blower and extraction wells The radius of influence at the well-heads was ' noted to range from 0 35 inches of water at well MW-4 to 38 inches of water at ASO-3 Three sets of extracted soil gas samples were analyzed for TPH-g,BTEX and MTBE TPH-g was ' detected In the 09 April, 12 May and 18 June 1997 samples collected from influent vapor stream at concentrations of 1,800 micrograms per liter µg/l, 8,900 µg/1 and 5,600 gg/l, respectively BTEX compounds were detected at concentrations as high as 52 gg/l Petroleum hydrocarbons were detected at 100 gg/l the sample collected from the effluent stream on 18 June 1997 ' ANALYTICAL RESULTS OF GROUND WATER SAMPLES - IAS/SVE STARTUP TPH-g was detected in the water samples from wells MW-1, MW-3, MW-4 and MW-5 at ' concentrations of 99,000 micrograms per liter gg/l, 6,900 µg/1, 100,000 µg/1 and 73 gg/l, respectively Benzene was detected in wells MW-1,MW-3 and MW-4 at concentrations of 19,000 µg/1, 97 µg/1 and 15,000 gg/l, respectively Benzene was not detected in wells MW-2, MW-5 and ' MW-6 Other BTEX compounds were detected in these wells at concentrations as high as 18,000 gg/l(toluene, MW-4) Ethylbenzene and xylenes were detected in MW-3 at concentrations of 230 gg/l for each compound No petroleum hydrocarbons were detected in the samples collected from Iwells MW-2 and MW-6, the newly installed down-gradient well MONITORING WELL INSTALLATION On 01 April 1998, soil boring MW-7 was advanced on the property directly east of the site The boring location is illustrated on Figure 2 The soil boring was advanced to a depth of 25 feet bsg Boring MW-7 was completed as a ground water monitoring well The well was completed using 2- inch diameter schedule 40 PVC casing with 0 02-inch slotted screen from approximately 5 to 25 feet ' bsg A filter pack was installed using#2 Lonestar sand from 4 to 25 feet Bentonite chips were used to make a two-foot plug and the remaining annular space was backfilled to the surface with portland cement A traffic-rated well box(8-inch diameter)was installed over each well, in accordance with County regulations 1 Advanced GeoEnvironmental,Inc 1