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' GEOMATRIX <br /> contained trace concentrations (less than 1.4 ltg/E) of the VOCs chloroform, chlorobenzene, and <br /> ' 1,2-DCP. The inorganic constituent nitrate was also detected at trace concentrations ranging between <br /> ND and 0.29 mg/t. Chloride and TDS were not measured due to the limited volume of these discrete- <br /> depth groundwater samples. <br /> ' 3.0 SCOPE OF WORK <br /> This work plan proposes additional assessment of the shallow, intermediate, and deeper groundwater <br /> zones at locations upgradient and downgradient of the Facility and installation of monitoring wells at <br /> ' selected locations in the shallow, intermediate, and deeper zones. <br /> The primary objectives of this additional groundwater investigation are to further characterize the <br /> vertical and lateral extent of groundwater containing chemicals beneath and downgradient from the <br /> Facility,to further establish background groundwater conditions for the Facility, and to further evaluate <br /> the hydrogeologic conditions beneath the Facility and its vicinity. To accomplish these objectives, the <br /> following tasks will be completed: (1)obtain property access and drilling permits; (2)drill, sample, and <br /> geophysically log exploration soil borings at seven locations to further evaluate hydrogeologic <br /> ' conditions; (3)collect discrete-depth groundwater samples from five borings to further characterize <br /> chemicals in groundwater; (4) install shallow-, intermediate-, and deeper-zone monitoring wells (as <br /> ' necessary) in a cluster at an upgradient location to further evaluate background groundwater quality; <br /> (5) install shallow-, intermediate-, and deeper-zone monitoring wells in a cluster at two downgradient <br /> ' locations to monitor groundwater quality downgradient of the Facility; and (6) install shallow- and <br /> intermediate-zone monitoring wells in a cluster at a location cross-gradient and south of the Facility, to <br /> further characterize the lateral extent of chemicals in shallow and intermediate zone groundwater. <br /> ' The procedures to be followed during field activities are described below. All activities will be <br /> ' conducted under the supervision of a Geomatrix geologist registered in the State of California. All <br /> Geomatrix personnel will follow the health and safety procedures described in the existing health and <br /> safety plan. The specific protocols for the field activities described below are presented in Appendix B. <br /> 3.1 Access and Permitting <br /> ' Property access agreements for drilling and monitoring well installation will be negotiated with the <br /> property owners upgradient (Volpi Ranch and Stockton Ford New Holland, Inc.) and immediately <br /> ' downgradient (San Joaquin Valley Associates) of the Facility. When these access agreements have <br /> been secured, subsurface assessment (drilling) permits will be requested from the San Joaquin County <br /> Public Health Services — Environmental Health Division (SJC-EHD). Field activities will not start <br /> ' until the appropriate permits have been obtained. <br /> 1 <br /> i�raaernae�voacuagKn�uo-n.mc 9 <br />