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Vapor Extraction Pipe The vapor extraction pipe will be place at approximately the six foot depth and will consists of one run of four inch 0 030 slot schedule 40 PVC 20 feet long This pipe will be plugged with a 4 inch cap at the north end and machine threaded connected to ten feet of 4 inch schedule 40 PVC pipe that will terminate within the traffic box containing the '/2 inch air sparging risers The vapor extraction pipe will then be buried with '/z inch clean pea to the 5 foot depth A layer of geofabnc will be placed over the pea gravel surface and the excavation wilI be compacted backfilled to resurfacing grade with road base EXCAVATED SOILS AND FLUIDS Prior to the excavation phase of this workplan, an area will be prepared to store all the excavated soils/sludge that will be generated, see Figure 3 and 4 All excavated soils will be temporarily stored on site within a fence compound, placed within a waterfluid collection berm covered with plastic liner The natural slope of the surface is to the southwest corner of the site At the southwest corner of the berm holding area, a sump will be dug approximately one foot deep Six mil black plastic liner will form the floor and walls of the berm Four inch SCH 40 0 04 slotted PVC will be placed vertically in the sump and then the plastic covered floor will be covered with coarse sand, approximately six inches thick, to help drain any fluids to the collection sump The excavated soils/sludge will be placed ontop of the sand with a pile slope not to exceed 35% from horizontal Once the all excavation has been completed, soil samples will be obtained from the stockpile soillsludge for laboratory analysis and the pile will then be covered with 6 mil plastic liner, until laboratory results indicate how the soil is to be handled Forward Landfill, 9999 South Austin Road, Manteca, California 95336, requires a four point composite sample analyzed for TPHg, BTEX and total lead NOTIFICATIONS Upon approval of this workplan and obtaining of all necessary permits a 48-hour notice will be given to all concerned parties prior to start of any site activities LIMITATIONS The information presented in this report is based on the following 1 The observations and data collected by field personnel 2 The result of laboratory analyzes performed by a state certified analytical laboratory 3 Our understanding of the regulations of San Joaquin County, the City of Stockton and the State of California 4 References reviewed for this report Changes in groundwater conditions can occur due to variations in rainfall, temperature, local and regional water use and local construction practices In addition, variations in the soil and groundwater conditions could exist beyond the points explored in this investigation State Certified Laboratory analytical results are included in this report This laboratory follows EPA and State of California approved procedures, however, WEGE is not responsible for errors in ithese laboratory results 7 Sanchez Rev WP 2-02