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Former Countryside Market,Stockton, California Feasibility Study and Interim Remedial Action Plan May 20,2013 9.0 REPORTING Upon completion of the proposed vertical plume delineation study, feasibility testing and data collection activities detailed herein, SGI will implement the IRAP. The initial results wil be presented and discussed in a separate document or in conjunction with an upcoming groundwater m nitoring and sampling report, and will include a discussion of how well the results satisfy the reme Jial objectives. Should the assessment results warrant a modified or alternative groundwater clE anup approach and/or soil remediation, the technical basis for such a potential shift in the overall 3trategy will be provided for CRWQCB review and approval. 9.1 Initial Progress Reporting Initial progress reporting will contain details about system installation and start-up, including the methodologies used for well installation/construction, data collection, and tc illustrate the modifications to the engineering design for the full-scale sparge system. Sparge testing anJ data logger field sheets will also be provided, as well as waste recycling documentation and laboratory analytical reports/chain-of- custody documentation. Additionally, test and observation well permits anc borings logs will be included along with a figure depicting the newly installed well locations. The testing data will be graphically presented in terms of well specific changes in both water levels and DO/ORP readings at various stages, including pre- and post-injection periods, as well as at low to moderate injection flow rates. Based on the results and measured distances between injection and observation wells, an effective ROI will be determined along with well specific oxygen uptake/biodegradation rates. The final report will be reviewed in its entirety and signed by a Calibornia Professional Engineer. Groundwater monitoring and sampling information will be included with the report (if available) or will be submitted under separate cover. 9.1.1 Mass Estimate of Petroleum Hydrocarbons in Soil Since recent soil analytical data from the former UST area is not available (i.e., last boring in this area was installed during 2001 per Section 2.0), it is currently not feasible to accurately estimate the petroleum hydrocarbon mass remaining in the vadose and saturated zc nes beneath the Site. Such an estimate is useful for a number of reasons, including being able o theoretically calculate the amount of air required to cleanup residually impacted vadose zor a soils and remediate the groundwater plume via sparging. As discussed in Section 5.1, soil samples will be collected for analy is during the installation of proposed wells AS-1, AS-2, OBS-1 and VW-1 (feasibility testing phase), and during the subsequent implementation of the IRAP (Section 7.0). The analyses will include physical properties data that is also useful for groundwater velocity and oxygen uptake/biodegradation rate calculations, potential Feasibility Sh Y aeM lFeasibility SN yBlR P-TW Final.dw 9-1 The Source Group,Inc.