Laserfiche WebLink
(VkTc � <br /> A S S O C I A T E S I N C . <br /> The equipment that will be used during the VET consists of an internal combustion (IC) engine, a <br /> 5 horsepower blower, instrumentation for measuring air flow, air velocity, air pressure and air <br /> temperature, PVC piping, fittings, wellhead connections, a portable organic vapor analyzer, and <br /> air sampling apparatus. ATC will utilize the three new vapor wells and the existing groundwater <br /> wells to conduct the pilot testing. <br /> Job Preparation and Coordination <br /> ATC will notify the San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD) and <br /> PHS/EHD at least 48 hours prior to performing the pilot test. All field work will be completed in <br /> accordance with the Site Safety Plan (SSP) and Quality Control/Quality Assurance Plan already <br /> on file for this site. <br /> Long Term Vapor Extraction Test <br /> A VET will be conducted utilizing vapor wells to determine the feasibility of vapor extraction to <br /> remove contaminants in the soil. The pilot test will consist of one long term VET and one short <br /> term VET on the second day. The long term VET will be performed by applying a vacuum on <br /> one of the new vapor wells utilizing an IC engine for approximately two to four hours or until <br /> subsurface conditions stabilize. The remaining two vapor wells and nearby groundwater wells will <br /> be used as observation wells. During the test, field personnel will measure flow rates, applied <br /> vacuum on the test well, induced vacuum in observation wells, pressure, and temperature. The <br /> extraction flow rate will be adjusted until the maximum flow rate and applied vacuum can be <br /> determined. <br /> Two influent vapor samples will be collected from the vapor extraction well for laboratory <br /> analysis of TPHg, BTEX, and MTBE. One vapor sample will be collected at the beginning of the <br /> test and one vapor sample will be collected at the end of the test. Also, an effluent vapor sample <br /> will be collected to determine destruction efficiency of the IC engine. Vapor samples will be <br /> analyzed for TPHg and BTEX by EPA Methods 8015/8020 and MTBE and additional fuel oxygenates <br /> by EPA Method 8260. <br /> Short Term Vapor Extraction_Test <br /> After the long term VET is completed, one short term VET will be performed on a different <br /> vapor well, and the test will last one to two hours. This test will be performed to collect additional <br /> data to assist in determining the effective radius of influence, and to determine the petroleum <br /> hydrocarbon concentrations extracted from this well. The same parameters will be monitored as in <br /> the long term VET. Two influent vapor samples will be collected from the vapor well for <br /> laboratory analysis of TPHg, BTEX, and MTBE. One vapor sample will be collected at the <br /> beginning of the test and one vapor sample will be collected at the end of the test. Vapor samples <br /> will be analyzed for TPHg and BTEX by EPA Methods 8015/8020 and MTBE and additional fuel <br /> oxygenates by EPA Method 8260. <br /> w:162577\reportslwkpinVaporExts.doc 5 <br />