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Kennedy/Jenks Consultants 8.2.4 Supplemental Investigation: Upgradient Offsite Deep Well Installations Three (3)deep monitoring wells similar to Wells MW-2 and MW-25 are proposed in an ongoing and supplemental investigation effort to characterize offsite and upgradient water quality (Section 6.7)and gradient(Figure 4).These data points are considered equal in priority with those discussed above to collect the information necessary to develop WQPS for the Site.The locations of the three deep wells identified as PDW-1, -2, and-3 are shown on Figure 20. Because of the complex terrain surrounding locations PDW-1 and -2,alternative locations are selected as contingency and they are identified as ADW-1 and ADW-2. These deep wells are proposed to provide additional water quality and gradient data to further understand the influences of upgradient groundwater on shallow groundwater quality beneath the Site and potential mixing of the shallow and deep groundwater. Deep Well PDW-3 is located near Well MW-3, and Well PDW-2 is adjacent to Well MW-13 with the intent of fingerprinting water quality signatures in localized areas. Depending on the success of encountering groundwater at depths of greater than 150 feet(similar to Wells MW-2 and MW-25), Musco may . propose to the RWQCB additional investigations with inter-well pumping tests and temperature tracer tests to confirm hydraulic communication within the tightly braided and variable-depth (i.e. heterogeneous)groundwater zones beneath the Site.The installation and sampling procedures for these monitoring wells will be similar to those proposed for wells in Study Areas 1 to 3. 8.3 Field Activities The following field activities will be conducted: drilling and installing monitoring wells,developing the wells, and collecting groundwater samples from monitoring wells for laboratory analysis. 8.3.1 Pre-Field Activities The following pre-field activities will be conducted prior to initiating fieldwork at the Site: • Update the site-specific Health and Safety Plan. • Complete access negotiations for installation and sampling of offsite monitoring wells. • Obtain well installation permits from the San Joaquin County EHD. • Select and mark the specific locations for the new monitoring wells. • Survey the proposed boring locations for potential location conflicts with subsurface utilities by performing a utility clearance check prior to drilling.The survey will be performed by contacting Underground Service Alert(USA)for utility clearance at least two working days before the scheduled fieldwork commences. In addition, a private subsurface utility locating service will perform a search for underground utilities at the proposed drilling locations. • Contract with a California licensed(C-57)drilling contractor to perform fieldwork. Phase I Groundwater Investigation Report and Work Plan for Phase I/Investigation Page 27 Musco Family Olive Company, Tracy, California B'�+9d+P�+�WbN,101Df.�mmmNr.WBmVa41d11r196,t1tpAmiY�'FW R�3y�.Ah,•LLwt GInWLLA¢