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WORK PLAN- MW-10 AND -11 PURPOSE The purpose of this work plan is to provide further Easterly and Northeasterly horizontal { delineation of the plume in the 45-80' sand layer. SELECTION OF LOCATION AND DEPTH OF -10 AND -11 There are three layers of concern. One sand layer at 20-40', another sand layer at 45-80' and the clays and silts at 90-100' which may receive leachate from the second sand layer above. The prominent direction of ground water flow is N 60° E with a gradient s=0.004. The 20-40' sand layer is bounded on the West and the South by the bearing of the gradient. The 20-40' sand layer is bounded on the North by CPT#3. The 20-40' sand layer is unbounded on the East. The narrowing of the 20-40' sand layer indicates that the horizontal limits will terminate before reaching new well MW-10. The bore logs for MW-10 will be consulted to see if a shallow well is needed. The 45-80' sand layer is bounded on the West and the South by the bearing of the gradient. The 45-80' sand layer is bounded to the North by CPT#5. The 45-80' sand layer is unbounded to the North/East (bearing of gradient) and on the East. MW-10 and MW-11 will be installed to provide data for the Northern and Easterly quadrant. The bore logs will be consulted when drilling, in order to set the tip at the bottom of the sand layer. A 10' screen length will be used to avoid cross contamination of adjacent sand layers. The clays and silts below the 45-80' sand layer are bounded on the West and on the South by the bearing of the gradient and on the North by CPT-3 and on the East by MW-81). EXECUTION OF -10 AND -11 The proposed well section is located in Exhibit A. The proposed well layout is in Exhibit B and an isometric layout of the lithology is in Exhibit C. The layout includes the location of all wells and ept's, and the highest values for TPI-1g, MTBE and 1,2-DCA at depth. The layout also includes an estimated boundary for TPHg and 1,2-DCA. Soil samples will be taken on five foot intervals starting at 20' below ground surface to final tip of well. Soil samples will be tested for BTEX, TPI-1g, Fuel Oxygenates and Fuel Additives. Well Development will be performed after well installation. Water samples will be taken with the proceeding quarterly monitoring and tested for BTEX, TPHg, fuel additives, and oxygenates. Foothill Engineering will obtain permission from the City of Stockton to place MW-10 within APN#149-095-03 held by the Redevelopment Agency, Foothill Engineering will obtain permission from Caltrans to install MW-I I between E/B S/R 4 Cross Town Freeway and the off