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10 May 2007 AGE-NC Project No. 01-0839 Page 3 of 5 connected to the inlet of the condensation separator,which leads into the vacuum blower;the outlet from the vacuum blower will be routed through a heat exchanger and then a catalytic converter cell. Induced vacuum will be measured utilizing a Magnehelic vacuum gauge attached to the inlet of the blower; SVE air flow will be monitored using a Dwyer DS-200 flow sensor. Sampling ports will be installed upstream of the vacuum blower inlet to recover SVE influent air flow vapor stream samples, and downstream of the catalytic converter cell chamber to recover effluent SVE air flow samples and to monitor the efficiency of hydrocarbon destruction.A schematic diagram of the SVE treatment unit is depicted on Figure 4; additional information is included in Appendix B. The proposed location of the SVE unit will be in the north section of the site(Figure 2),which will allow the Ernie's General Store facility to conduct day to day business without interference from the operation of the SVE remediation system. The SVE unit will be secured by a chain-linked, gated enclosure approximately 15 feet wide, 20 feet long, and 7 feet high. Electricity is readily available to the site; a dedicated electrical meter will be installed by representatives of the City of Stockton Utilities that will connect directly to the SVE unit. 2.5. INTERIM REMEDIATION START-UP PERIOD During the SVE start-up period (first week of operation), in order to monitor hydrocarbon destruction efficiency,influent and effluent air-flow vapor samples will be collected on a daily basis and submitted to a State of California Department of Health Services(DHS)-certified laboratory for analysis for the following constituents: • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Method 8015 Modified; and • Benzene, toluene, ethylbenzene, and total xylenes (BTEX) and methyl tertiary-butyl ether (MTBE) in accordance with EPA Method 8260B. SVE operational parameters including soil-gas vapor concentrations, air flow, vacuum, and temperature will be monitored on a daily basis to gauge the optimal destruction rate of recovered hydrocarbon vapors. Following the SVE start-up period,air-flow vapor samples will be collected on a monthly basis and the SVE operational parameters will be monitored on a weekly basis to monitor cleanup progress. Advanced GeoEnvironmeotel,Inc.