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02 September 2010 Zt <br /> AGE-NC Project No. 95-0184 �n� 0 ` <br /> Page 2 of 7 <br /> The concentrations of dissolved constituents in shall w groundwater samples (MW-5)�,. <br /> collected from the southern UST area are greater than intermediate and deeper ground <br /> water samples collected from the same area (MW-4 and MW-8). The concentrations of <br /> dissolved constituents collected in shallow ground water samples from the northeast UST <br /> area are eater than ground water collected from the intermediate well samples (MW-1(2� �'/) <br /> vs. 1 th gh VW-5)13 _ .. ✓W "!3 11 1 <br /> Y+" � h � <br /> (W.1 ✓w 1 = max <br /> The maximum concentrations in the northeast UST release-are--a were detected in the <br /> upper 50 feet of the subsurface as demonstrated by soil and ground water samples. <br /> Currently, an interim SVE system is operational at the site. The SVE piping is connected <br /> to well EW-1. <br /> 2.0. SCOPE OF WORK <br /> Based on the results of In-Situ Air Sparging Feasibility Pilot Test Report, AGE proposes <br /> to install, operate and maintain in-well air-sparging equipment in two existing ground water <br /> remediation wells, extraction well EW-1 and deep extraction well EW-2. <br /> 30'-S-v' <br /> The remediation field activities will consist of the following tasks: <br /> • Installation of additional underground remediation piping; - <br /> • Installation of two in-well air sparging units within extraction wells; <br /> • Ground water remediation start-up period (one week); <br /> • Monitoring and maintenance; <br /> • Preparation of reports. <br /> Each of these tasks are discussed below in detail. <br /> 2.1. PERMITTING AND PRE-FIELD WORK ACTIVITIES <br /> Applicable site permits have be obtained from the City of Stockton and from the San <br /> Joaquin Valley Unified Air Pollution Control District.An update to the health and safety plan <br /> presently on-file will be prepared in accordance with Occupational Safety and Health <br /> Guidance Manual for Hazardous Waste Site Activities(National Institute for Occupational <br /> Safety and Health Administration, U.S. Coast Guard and U.S. Environmental Protection <br /> Agency, 1985). Priorto mobilization, all underground trenching areas will be clearly marked <br /> and a utility clearance obtained through Underground Service Alert. <br /> Advanced GeoEnvironmen[al,Inc. <br />