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r REVISIONS TO SITE ASSESSMENT PLAN KAYO OIL COMPANY 4325 WASHINGTON STREET, STOCKTON, CA i The revisions to the work plan proposed by Applied Geosystems for the Washington Street site primarily consist of adding wells and additional detailed data gathering. We propose to proceed through the following sequence of steps: 1. Measure the water level in well MW-11. 2 . Drill monitoring well MW-12 across Washington Street, sampling it for 12" above the water table and 6" below the water table for chemical analysis. The hole would be sampled at a 5 ' interval over the rest of its depth. Well M11-12 will be installed and developed as a 4" monitor well , and a water sample taken immediately after development. The soil samples ' from the water table and capillary fringe, and the water sample will be sent out for chemical analysis immediately. 3 . While waiting for the analytical results from the MW-12 samples, we will drill soil boring B-13 . This borehole will be continuously sampled from a depth of 15 ' to its total depth, which will be no more than 751 . B-13 will be backfilled to the surface with a cement-bentonite mixture as soon as drilling and sampling are completed. Samples will be described and sampled for chemical analyses, porosity, permeability, and grain size. When that data comes back from the labs it will be used to design an 8" diameter recovery and aquifer testing well, MW-14 , which will be installed near B-13 . 4 . Monitoring wells MW-15, MW-16, and MW-17 will be drilled and developed as 4" wells immediately following the completion of boring B-13 . They will be drilled, sampled, and developed as , described in the Applied Geosystems proposal. I 5. The location of monitoring well MW-18 will determined by the analytical results from well MW-12 . If the soil and water samples from MW-12 are clean, then the location shown on the accompanying map as MW-18 will be drilled. If the soil or the water prove to be contaminated, then the well will be moved to the west to the location marked as MW-18A, to try to i have a better chance of defining the edge of the plume in that direction. Only one of the two locations (MW-18 and MW- 18A) will actually be drilled. 6. Monitoring wells will be sampled for Cr and As in addition to ' the standard petroleum hydrocarbons until it is established that contamination from the Marley Cooling Towers superfund site has not reached the Kayo location.