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12 July 2012 <br />AGE-NC Project No. 02-0926 <br />Page 2 of 7 <br />Prior to the commencement of the IAS pilot test, baseline depth to water and dissolved <br />oxygen (DC) measurements were collected from observation wells MW-1 and MW-3 <br />through M\N-5; MW-2 was not accessible during baseline sample collection due to a car <br />being parked over the well. Well parameters were generally collected on a weekly basis <br />during standard operation and maintenance of the onsite systems. Ground water samples <br />were collected from shallow impacted well MW-5 once per month during the pilot study <br />operational period. All sample were analyzed by Cal Tech Environmental Laboratories <br />(CTEL), a Slate of California Department of Public Health-certified analytical laboratory for <br />the following constituents: <br />Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA method <br />8015M; <br />Volatile organic compounds benzene, toluene, ethylbenzene, xylenes (BTEX) <br />methyl tertiary butyl ether (MTBE), tertiary butyl alcohol (TBA), diisopropyl ether <br />(DIPE), ethyl tertiary butyl ether (ETBE) and tertiary amyl methyl ether (TAME) by <br />EPA method 8260B; and <br />Lead scavengers 1,2-dichloroethane and 1,2-dibromoethane (EDB) by EPA method <br />8260B. <br />Once the pilot test was initiated, startup influent and effluent vapor stream samples were <br />collected from the on-site SVE system. Vapor samples were collected from the influent and <br />effluent stream once per month of operation; one additional effluent sample was collected <br />during the above referenced carbon change out. All samples were submitted to CTEL for <br />analysis of the following: <br />TPH-g by EPA method 8015M; <br />BTEX by EPA method 8260B; and <br />MTBE by EPA method 8260B. <br />Following the initiation of sparging, pressure and flow readings from the compressor and <br />DO and depth to water measurements were generally collected on a weekly basis during <br />routine system maintenance activities. <br />System operational, field and analytical data is summarized in Tables 2 through 6. <br />3.0. IN-SITU AIR SPARGE PILOT TEST FINDINGS <br />After initial breakthrough, pressures of approximately 16.5 and 17.5 pounds per square <br />Advanced GeoEnvironinental, Inc.