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Soil Investigation and Backgro RA und Groundwater Monitoring C A B ► Well Installation Workplan Addendum February 2,2007 4• No more than 20-feet of well screen will be used to construct the monitoring wells. We plan to I install no more than 5-feet of screen above static groundwater level in the well borings. _ 5- As stated on page 5, paragraph 3, of the workplan, continuously from the to P a Portland cement rout will be p of the bentonite to a g Placed with local regulations, a San Joaquin County Enviromately one foot below ty Environmental Health De grade.In accordance will be contacted to observe and direct grouting activities.According to San Jo Department representative Standards (Ordinance Code Section 9-1115.6), the grout will be placed on to Joaquin County Well bentonite transitional seal with a tremie pipe. P of the hydrated ® 6. All groundwater samples collected for the initial fou ng events and dissolved metal concentrations. We will follow their sampling hill be analyzed for total Procedures outlined in the Designated Level Methodology jor Waste Classs will be refrigerated to fcation and Cleaup filtration Level Determination document as requested.For dissolved metals,sample 4°C,filtered through a 0.45 micron(pm)filter in the laboratory within 24-hours of co acidified to pH of Q with nitric acid flection,and (HNO3) before analysis. Total metals are acidified in the field and refrigerated to 4°C prior to analysis. 7. "Soil cuttings will be stockpiled on and covered with visqueen in the location of the proposed infiltration/evaporation pond.The soil cuttings will be incorporated with the material excavated during the construction of the pond and used to build the soil berm for this pond. Purged groundwater will be collected and discharged to the onsite standby storage pond. 8. As shown on Figure 1 and required in San Joaquin County Well Standards (Ordinance Code Section 9-1115.6)a2 foot by 2 foot concrete surface seal will be constructed around the top of the monitoring well casings at the ground surface.The surface seal will be at least 4-inches thick and will be sloped to drain fluids away from the well. The surface seal will be continuous with the annular seal and the well cover. . 9. Based on your comms that the proposed monitoring wells are located to close to the proposed infiltration/evapodion pond we propose moving both southern wells closer to the river,as shown on Figure 2.We papose moving the northern well north of East Buena Vista Road.Due to a large shear cliffroad carthe only location accessible to install the well is near the facility gate on East Buena Vista Road(Figure 2). 2