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• • <br /> F ADDITIONAL ASSESSMENT WORKPLAN <br /> JAMAR SERVICE, STOCKTON <br /> APRIL 2002 <br /> 4 <br /> The objective of the vapor test is to evaluate whether the soils beneath the site are amenable <br /> to vapor extraction mitigation techniques and whether entrained petroleum hydrocarbons <br /> can be removed from the subsurface with this method The test will also aid in the <br /> evaluation of transport away from the site through the vadose zone An influent sample <br /> from each well will be taken approximately 5-minutes after startup and again at the end of <br /> the test or approximately 20-minutes Vapor samples will be collected in a 1-liter Tedlar® <br /> bag. The vapor samples will be submitted to a California certified analytical laboratory for <br /> chemical analyses of TPH G, BTEX and fuel oxygenates using Method TO-14 <br /> A portable vapor extraction unit will be used to extract and one, 200-pound granular <br /> activated carbon(GAC)unit will be used to treat the air from the vapor wells All vapor <br /> emissions generated during the test will be treated in accordance with the San Joaquin <br /> Valley Unified Air Pollution Control District requirements Vapor samples obtained from <br /> the wells will be monitored in the field for the presence of volatile organic compounds <br /> (VOCs)using an organic vapor analyzer(OVA) The extraction wells will be monitored <br /> for approximately 15-minutes prior to the collection of vapor samples for laboratory <br /> analyses <br /> REPORTING <br /> Problem Assessment Report <br /> GHH will prepare an PAR to document these phases of the work and summarize site <br /> investigation and pilot testing data for the site The report will include GHH's <br /> interpretation of information gathered during the investigation, detailed descriptions of the <br /> methodologies used to collect and analyze the data, analytical results, geological controls <br /> on hydrocarbon and MTBE mitigation, the total estimated mass of impacted soil and <br /> groundwater, the estimated rate of transport_of impacted soil and groundwater away from <br /> the site, copies of laboratory certificates with COC documentation, subcontractor reports, <br /> discussion and evaluation of pilot testing results, and our conclusions and <br /> recommendations. <br /> The PAR will also document the potential for a commingled plume situation resulting from <br /> several nearby sites which have or have had retail petroleum businesses and have a <br /> potential to impact the subject site <br /> 12 <br />