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QR11N <br /> 1.2 Objectives and Scope of Work <br /> The objective of the planned site assessment activities are to delineate the nature and <br /> extent of impacted groundwater at the site Orion will drill and install three groundwater <br /> Imonitoring wells and perform two groundwater monitoring events separated by three <br /> months to meet this objective It is anticipated that these steps will demonstrate a low risk <br />' site based upon plume stability and previous work showing no significant receptor <br /> impacts The proposed scope of work will include the following tasks <br /> ❑ Mark monitoring well locations at the site and notify Underground Service <br /> Alert (USA) to identify subsurface utilities <br /> 11 Obtain encroachment and revocable permits plus financial security deposit <br /> from the City of Stockton for installation of two wells in sidewalk portions <br /> of El Dorado Street <br /> ❑ Obtain monitoring well permits from the SJCPHS-EHD <br /> ❑ Drill and install three groundwater monitoring wells to a depth of <br /> approximately 35-40 feet below grade <br /> ❑ Perform two groundwater sampling events, one immediately following <br /> installation and development of the wells and one in approximately three <br /> months after well installation <br /> ❑ Analyze the groundwater samples at a State-certified laboratory for <br /> ❑ Total petroleum hydrocarbons as gasoline (TPHg) using modified <br /> U S Environmental Protection Agency (EPA) Method 8015 <br /> © BTEX and methyl tert-butyl ether (MTBE) using EPA Method 8020 <br /> ❑ samples Analyze soil for TPH , BTEX and MTBE and dispose of the drilling <br /> Y P g <br /> residuals and well development and purge water <br /> ❑ Perform health and safety g monitorin during field activities <br /> ❑ Evaluate groundwater monitoring data and prepare a report <br />' S\BFS\STOCKTON\WKP001 DOC 10/27/99 1-2 <br />