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Report—Remedial Action Feascbility Page 5 Cutter Lumber—Western Lift Site GPE Project No 102 3 . August I,2003 2.0 PILOT TEST SYSTEM INSTALLATION 2.1 Permitting Permitting for the on-site work included a drilling permit from the San Joaquin County Environmental Health Department (SJC-EHD) For short term pilot testing, it is not necessary to obtain a separate air emissions permit from the San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD), however measures must be taken to assure that extracted petroleum vapors are not release to the atmosphere 2.2 Soil Boring Installation In order to complete the initial 2-well pilot system, a new air sparge well and a new vapor extraction well were constructed (see Figure 2 for locations) The wells were drilled using hollow stem auger tools operated by a C-57 licensed drilling contractor During drilling, the borings were logged and sampled by a professional geologist supervised by a ' registered geologist The following paragraphs describe the borings more fully On February 20, 2003 a CME-85 hollow-stem auger drilling rig, owned and operated by West Hazmat Drilling Corp , was used to drill two soil borings The vapor extraction well (VEW-1) was drilled using 15-inch diameter augers to a total depth of 41 feet, while the sparge well (ASW-1) was drilled using i0-inch diameter soil boring to a total depth of 45 feet The borings were later converted into wells While drilling, all soil cuttings were placed in D O T approved, steel 55-gallon drums for temporary storage pending profiling and proper disposal 2.3 Aar Sparge Well Construction This well, ASW-1, is located approximately 15 feet up-gradient from the vapor extraction well VEW-1 It was drilled using 10-inch diameter augers The following tables describes the construction of the two Air Sparge Well Construction (ASW-1) Casing 2"Schedule 40 PVC Screen 0 010 Slotted Schedule 40 PVC Screened Interval 39-44 feet below ground surface (bgs) Filter Pack 44-36 feet bgs Filter Pack Material Pea Gravel Bentonite Transition Seal 36-35 feet bgs Annular Seal 0-35 feet bgs The sparge well is screened to expel air slightly below the main contaminant mass near the top of an impermeable clay located about 42 feet below grade Insofar as the well was not intended for groundwater sampling, it was not deemed necessary to develop the well • 2937 Veneman Ave,413240 Geo-Phase Environmental Inc Phone(209) 569-0293 Modesto, CA 95356 Fax(209) 569-0295