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Former Countryside Market,Stockton, California May 20,2013 Feasibility Study and Interim Remedial Action Plan regularly assessed in accordance with the final RAP. Methodologies used for the installation of these potential shallow screened casings and the associated collection of soil gas data will be consistent with the April 2012 Advisory - Active Soil Gas Investigations published by the DTSC and CRWQCB, Los Angeles and San Francisco Bay Regions (Cal/EPA, 2012). If vapor probes and/or additional vapor wells are installed, the sampling depths/screened intervals are anticipated to range from approximately 10 to 40 feet bgs but will be cho en based on data collected during the advancement of each respective boring with the goal of targeting relatively course grained soils (i.e., to help ensure representative samples can feasibly be coil( cted for routine monitoring and/or analysis in accordance with the final RAP). 7.5 Groundwater Monitoring and Sampling/Reporting Groundwater monitoring and sampling will be completed on a routine basis before and after the implementation of the [RAP. Groundwater samples will be collected utilizing low flow sampling techniques, and the CRWQCB will be notified in advance of all monitorinb and sampling events. The purpose of the monitoring and sampling program will be to provide data that can be used to evaluate and move the Site toward closure. A proposed groundwater monitoring and sampling program for the Site is provided in the table below. Proposed Groundwater Monitoring and Samplinj I Program Field Measurement' Groundwater Monitoring Well Location Well ID Frequency and Sampling'Frequency On-Site/Up-gradient of MW-4 and MW-5 Quarterly Quarterly Former UST Area On-Site/Within or Near OBS-1 and Quarterly Quarterly Former UST Area OBS-2 Cross-& Down- MW-1, MW-2, MW-3, Quarterly Quarterly gradient/Adjacentto MW-6, MW-7, MW-8B, Copperopolis Road OBS-3 and OBS-4 On-Site and Down- 10757, 10848, 10922 Not Applicable Quarterly gradient Domestic Wells and 10967 i 1 Field measurements will include DO and ORP. 2 Groundwater samples will be analyzed for TPHg, BTEX compounds and oxygenates (TAME,TBA, EDB, 1,2-DCE or EDC, DIPE, ETBE and MTBE) by EPA I Aethod 82608. Feasibility SVAy and Weasibilily StWy&IRAP TeM Final.d. 7-6 The Source Group,Inc.