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Former Beacon Station No.104 February 26,2003 Stockton California Prelimina y Results Report and Work Plan Addendum • The monitoring wells MW-13 and MW-14 shall be vertical delineation wells screened at 145 to 150 feet bsg and 135-140 feet bsg, respectively. The purpose of the wells shall be to delineate the vertical extent of dissolved gasoline constituents in the monitoring well MW- 12 area and to confirm the vertical delineation indicated by the soil boring B-6 groundwater sample. Monitoring wells MW-15, MW-16 and MW-17 shall be used to delineate and confirm the lateral and vertical extent of dissolved gasoline constituents south of the monitoring weII MW-7 area, south of the monitoring well MW-9 area, and west of the monitoring well MW-11 area. The monitoring well shall be screened at 145 to 150 feet bsg in MW-15, at 95 to 100 feet bsg in MW-16, and at 135 to 140 feet bsg in MW-17. All fieldwork shall be conducted in accordance with Horizon Field Methods and Procedures (Appendix B). The scope of work to be performed shall be accomplished by the following tasks: Task 1 Schedule a licensed driller to perform drilling and well installations; secure off-site property access agreements or encroachment permits, if necessary; obtain required well permits from the San Joaquin County Environmental Health Department; 4) secure encroachment permits, if required; 5) update the Site Health and Safety Plan; and notify Underground Service Alert (USA) to identify and locate underground utilities in the site area. Task 2 Utilize a C-57 licensed drilling contractor to drill soil borings using hollow- stem auger equipment and install monitoring wells MWA 3 through MW-17 in the borings. Record sampling information, field screening and soil description data, and well construction details on soil boring logs during drilling and well installation. Describe soils using the Unified Soil Classification System (USCS). Collect soil samples at 5-foot intervals with a split-spoon sampler for lithologic logging purposes and for potential analyses where necessary to supplement site soil data. Field screen soil samples for the presence of volatile hydrocarbons with a photo-ionization detector (PID) or equivalent device. C:\Projects11474\14\WPaddnm2-03.doe Project No. 1474.14 5 HORIZON ENVIRONMENTAL INC.