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1 1 . Site Background Information ' Chapin Brothers Investments, Inc Page 7 of 12 r7 to 10 scfm during each monitoring event A pressure of approximately 15 was to maintain for the air sparging flow rate rThe SVE unit operated at varying rates during the observation period Extraction now rates were calculated to range from 150 to 200 scfm Typically operation averaged at 150 scfm during the period Operation of the unit was attempted at 200 scfm, 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 rAn 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 rnoted 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 µg11 and 5,600 µg11, respectively BTEX compounds were detected at concentrations as high as 52 µg/1 Petroleum hydrocarbons were detected at 100 µg11 the sample collected from the effluent stream on 18 June 1997 rANALYTICAL 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 rconcentrations of 99,000 micrograms per liter µg11, 6,900 µg/l, 100,000 µg11 and 73 µg11, respectively Benzene was detected in wells MW-1, MW-3 and MW-4 at concentrations of 19,000 µg/1, 97 µg11 and 15,000 µg11, respectively Benzene was not detected in wells MW-2, MW-5 and rMW-6 Other BTEX compounds were detected in these wells at concentrations as high as 18,000 µg/1(toluene, MW-4) Ethylbenzene and xylenes were detected in MW-3 at concentrations of 230 µg/l for each compound No petroleum hydrocarbons were detected In the samples collected from rwells MW-2 and MW-6, the newly installed down-gradient well rMONITORING WELL INSTALLATION r 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-mch 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 r Advanced GeoEnvirontnental,Inc r