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1 <br /> _ 1 <br /> 07 September 1999 <br /> AGE-NC Project No 95-0104 <br />' Page 2 of 8 <br />' an area lacking general public access <br />' 2 2 GROUND WATER SAMPLING <br />' After purging the wells and pnor to collecting ground water samples, ground water levels in <br /> monitoring wells MW-1, MW-5, MW-6 and VW-1 achieved a minimum of 80 percent recharge <br /> Ground water samples were collected from the four purged wells utilizing new, disposable <br />' polyethylene bailers The retrieved samples were transferred Into 40-m1 EPA-approved VOA vials <br /> containing 0 5 ml preservative Care was taken to ensure that visible air bubbles were not present <br /> in the vials after filling and capping Ground water sample containers were labeled with the well <br />' designation, date, time, and sampler's Initials <br />' 23 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> Each ground water sample was logged on a chain-of-custody form, placed in a chilled container and <br />' transported to a California Department of Health Services (DHS)-certified laboratory for analysis <br /> far <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA Method 8015M, and <br /> • Volatile aromatic compounds (benzene, toluene, ethyl benzene and xylene BTEX) with <br /> inethyl-tertiary butyl ether (MTBE) by EPA Method 8020 <br /> 3.0. SOIL VAPOR EXTRACTION/IN-SITU AIR SPARGE PILOT TEST PROCEDURES <br /> On 22 July 1999, a SVE/IAS pilot test was continued at the site by applying a vacuum at well VW-I <br /> and injecting compressed air into well MW-6, between 22 July 1999 and 27 August 1999 SVE/IAS <br /> pilot test operation, a total of five extracted soil gas samples were collected at the Inlet of the SVE <br /> unit SVE and IAS pilot test procedures for the site were outlined in a letter dated 02 June 1998 <br /> prepared by AGE and approved by the PHS-EHD by letter on 15 June 1998 <br /> 3 1 SOIL VAPOR EXTRACTION/IN-SITU AIR SPARGE SYSTEM PROCEDURES <br /> IBetween 22 July 1999 and 27 August 1999, a SVE/IAS pilot test was continued at the site The <br /> iSVE/IAS pilot test was performed to provide additional SVE and IAS data for feasibility analysis, <br /> provide immediate protection to the nearby drinking water well and potentially provide enough <br /> Advanced GeoEnNironmental,Inc <br />