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' Report—Fist Phase Remedial System Page 5 <br /> Former Manna Pro Site <br /> Project No 207 3 <br />' June 18,2002 <br /> 2.0 PILOT TEST SYSTEM INSTALLATION <br /> 1 � <br />' 2.1 Permitting <br /> Permitting for the on-site work included drilling permits from the San Joaquin County <br />' Public Health Services Environmental Health Division (SJC-PHS-EHD) and a Permit-to- <br /> Construct the vapor extraction system from the San Joaquin Valley Unified Air Pollution <br /> Control District (SJVUAPCD) <br /> 2.2 Soil Boring Installation <br /> In order to complete the initial 3-well system, a new air sparge well was required The <br /> well was drilled using hollow stemmed auger tools operated by a C-57 licensed drilling <br /> contractor During drilling, the borings were logged and sampled by a professional <br />' geologist supervised by a registered geologist The following paragraphs describe the <br /> boring more fully <br />' On July 31, 2001 a CME-85 hollow-stem auger drilling rig, owned and operated by West <br /> Hazmat Drilling Corp , was used to drill a 10-inch diameter soil boring to a total depth of <br /> 55 feet The boring was designated as Air Sparge Well 2 (ASW-2) The boring was later <br /> converted into a well While drilling, all soil cuttings were placed in D O T approved, <br /> steel 55-gallon drums for temporary storage pending profiling and proper disposal <br /> 2.3 Air Sparge Well Construction <br />' This well, ASW-2, is located approximately 15 feet up-gradient from the vapor extraction <br /> well VEW-1 It was drilled using 10-inch diameter augers The following table describes <br /> the construction of the air sparge well <br />' Casing 2" Schedule 40 PVC <br /> Screen 0 010 Slotted Schedule 40 PVC <br /> Screened Interval 50-55 feet below ground surface(bgs) <br />' Filter Pack 48-55 feet bgs <br /> Filter Pack Material #3 Monterey sand <br /> Bentonite Transition Seal 4548 feet bgs <br /> Annular Seal 045 feet bgs <br /> The sparge well is screened to expel air slightly below the main contaminant mass near <br /> the top of an impermeable clay located at 50-52 feet below grade Insofar as the well was <br /> not intended for groundwater sampling, it was not deemed necessary to develop the well <br />' 2937 Veneman Ave, #13240 Geo-Phase Environmental Inc Phone(209) 569-0293 <br /> Modesto,CA 95356 Fax(209)569-0295 <br />