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Work Plan for Groundwater Monitoring Well Installation at the California Army National Guard Stockton Field Maintenance Shop, Stockton, California 3.0 PROPOSED ACTIVITIES This section describes specific activities associated with the scope of work intended to delineate the extent of impacts to site groundwater from contaminants released from the former USTs, determine the direction and gradient of groundwater flow at the site, and perform a preliminary evaluation of the potential need to implement remedial activities for site groundwater contamination. To meet these project objectives, the proposed scope of work will include obtaining the necessary groundwater monitoring well construction permits, performing site clearance from potential underground utilities or other obstructions, and installing five groundwater monitoring wells to evaluate the lateral extent of groundwater impacts at the site. The scope also includes implementation of a quarterly groundwater monitoring and reporting program to evaluate variations in contaminant concentrations and groundwater gradient over the course of one year and, based on the findings of that program, providing recommendations for future investigative and/or remedial actions, as necessary and appropriate. All proposed field activities will be conducted in accordance with the Accident Prevention Plan (APP)/Site Safety and Health Plan (SSHP) (Appendix B). 3.1 PERMITTING The San Joaquin County Environmental Health Department (SJCEHD) is the lead agency that oversees the installation of groundwater wells within San Joaquin County. In accordance with SJCEHD requirements, one well permit application will be filed for each of the five proposed groundwater monitoring wells, and the appropriate well permit application fee will be submitted. Once the permits have been issued by SJCEHD, field activities will be scheduled. 3.2 SITE PREPARATION All proposed field activities will be coordinated in advance with the CVRWQCB and with CA ARNG personnel. Site preparation activities will be coordinated by OTIE's Field Manager, and will be initiated by a visit to the site to mark proposed groundwater monitoring well locations and ensure that those locations are cleared for underground utilities or other obstructions. This clearance will include: • Reviewing with CA ARNG personnel available site drawings indicating the approximate locations of all underground utilities (e.g., water, sewer, telecommunications, cable television, electric and gas) associated with site operations, making use of any anecdotal information that may be available through CA ARNG personnel familiar with site operations; • Marking the proposed locations with white spray paint; • Clearing the specific locations using a contracted private utility locator, who will use appropriate geophysical techniques to identify potential underground obstructions at those locations; and • Making appropriate notification to Underground Service Alert (USA) at least 48 hours prior to commencement of invasive drilling activities. OTI E