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Ms Mary Meays Project 0805-140 03 • November 13, 1995 Page 2 • The general contractor will obtain any necessary permits regarding the compaction and grading of the tank cavities • Once the old tank cavity has been backfilled, EMCON will observe a licensed well driller drill one 10-inch-diameter soli boring in the old tank cavity The proposed boring location is shown on Figure 2 The boring will be drilled to groundwater (approximately 40 feet below ground surface [bgs]) Based on field screening data (using a photoionization detector) of soil samples, EMCON will construct a dual completion 2-inch-diameter vapor extraction well (VW-5) The dual completion will consist of installing two 2-inch-diameter casings in the borehole The lower portion of the well will be screened from approximately 22 to 42 feet bgs using 0 10 slotted screen The upper portion of the well will be Screened from approximately 4 to 19 feet bgs using 0 10 slotted screen The purpose of the boring is to assess the vertical extent of hydrocarbons below the former UST The purpose of the dual completion well is to provide soil vapor extraction coverage in the old tank cavity above and below 20 feet bgs • Undisturbed soil samples will be collected from the boring located in the former j tank cavity for classification and laboratory analyses at 5-foot intervals, or at soil changes, from the ground surface to the total depth of the borings Please call if you have any questions regarding this addendum or any other aspect of the project i Sincerely, �z�--D GEO�O CJ G` JAY R EMCON JOHNSON (� �f�jFyNO 5867 cYJohnson Project Geologist Senior Project Geologist aFO R G 5867 Attachments Figure 1 Site Vicuuty Map Figure 2 Generalized Site Plan cc Kyle Christie, ARCO Products Company Elizabeth Thayer, California Regional Water Quality Control Board • SAON NPM805N08051400 3$S-95\p s 1