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-Ire) D-ol-Lfo( Stockton 15 May 2007 WORK PLAN Objective The objective of this work plan is to describe the proposed activities, which are intended to characterize the subsurface conditions at the project site. Proposed Subsurface Exploration Plan and Associated Activities General: We plan to drill and log eleven borings at the proposed locations shown approximately on the attached conceptual Plan. Six of the borings will be converted into groundwater monitoring wells. The borings will extend to maximum depth of 50 feet and the monitoring wells will extend to maximum depth of 25 feet. Drilling and Sampling: 1. Equipment: Taber Exploration will use a CME 55 rig mounted on a truck. The rig is approximately 8' wide by 15' long. A support truck approximately 8' wide by 15' long will be on site to carry water tank and materials (such as cement bag, sand, bentonite chips, etc.). Terrasearch will also bring a pickup truck. We will drill and sample as follows: Procedure: t A Drill through the soils method and take Modified with 6-inch hollow p stem 15 drilling California (MC) and standard penetration test (SPT) samples of the soil materials encountered. Take samples in the upper 1 to 5 feet at each boring location. Samples will be collected every 5 feet below depth of 5 feet. After determining the depth to the water bearing layer in the field, we will install a well to monitor groundwater elevation. The monitoring wells will extend to maximum depth of 25 feet. Then, we install a maximum 25-foot long slotted PVC pipe in each monitoring well. Annular space around the slotted section of the pipe will be filled with sand or gravel. An approximately 2 foot seal will be constructed above the sand/gravel pack using soil cuttings. This operation will be conducted under the observation of the SJEHD inspector. 5- cr)