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Groundwater Well Installation Work Plan Sharpe Army Depot Lathrop, California 3.1 Pre-Field Activities For onsite wells, pre-field activities will involve coordination with the Presidio of Monterey Directorate of Public Works Environmental Division (DPW-E) for permitting, and geophysical and biological clearances, as needed. For the three wells proposed within the housing developments west of Sharpe, pre-field activities will include coordination with the City of Lathrop for easements, notification to adjacent residents, and geophysical clearance. Forthe three wells proposed on the UPRR property, pre-field activities will include coordination with UPRR for easements and geophysical clearance as needed. 3.1.1 Notification and Access Before commencing field activities within the Sharpe boundaries, permits as well as geophysical and biological clearances will be coordinated with the Presidio of Monterey DPW-E. No field notifications or other access requirements are required. For well installation outside the Sharpe boundaries, access agreements with private property owners will be arranged by USACE Real Estate. Easements for work within roadways will be obtained from the City of Lathrop. Residents will be notified of scheduled field activities per City of Lathrop requirements. For well installation on the UPRR property, access agreements will be arranged between USACE Real Estate and UPRR. Previous attempts to establish access agreements with the UPRR have resulted in significant project delays. Installation of EWC8, EWC9, EWCC7, and associated conveyance lines on UPRR property, including final locations and installation schedule, will depend on access agreement negotiations between the Army and UPRR. All field activities will be coordinated with property owners. 3.1.2 Permitting A permit from the San Joaquin County Environmental Health Department(SJCEHD)will be obtained before the fieldwork for well installation outside the Sharpe boundaries (EWC8, EWC9, MW55113, MW551C, and MW552C).A representative of SJCEHD will be notified at least 48 hours before the commencement of the fieldwork to allow time for a field inspection. At a minimum, the representative should be present to monitor the grouting (sealing) of the well casing. 3.1.3 Geophysical Clearance Before drilling, utility clearance will be performed to identify underground utilities and other potential obstructions. Clearance activities include notification of utility agencies and utility protection organizations as appropriate and completing onsite surveys using geophysical equipment. Utility locations will be marked on the ground surface to indicate the assumed utility type. Before initiating intrusive activities, utility location information will be reviewed, including field markings and available drawings. Borings will be made by hand auger(or similar method)to a depth of 5 ft bgs. Ahtna Environmental,Inc. 7