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i lcY Project No 58100-06-18 June 2t, 1995 Page 8 G Perform headspace surveys on the soil samples collected using a portable OVA, equipped with a PID or FID Headspace readings represent qualitative indicators of the presence of organic vapors in the pore space of the soil samples collected The headspace readings will be recorded on the boring logs submitted with the final report G Submit soil samples for the analyses of TPHg following EPA Test Method 8015 modified and BTEX following EPA Test Method 8020 c Provide QA/QC procedures during the field activities These procedures will include cleansing/rinsing of the sampling equipment prior to each sampling effort, the cleansing/rinsing of the drill rig augers prior to and between borings and providing chain-of- custody documentation for each sample collected and transferred to the laboratory for analytical testing u All drilling, sampling, and related activities will be conducted under the supervision of a Certified Engineering Geologist or a Registered Geologist who will be responsible for signing the final boring logs • o Onsite soil generated during the boring activities will be collected in 55-gallon drums and stored onsite for disposal following regulatory protocol u Install vapor extraction monitoring wells VM-1 and VM-2 at the locations shown on Figure 2 The vapor extraction monitoring wells will be constructed using 2-inch diameter PVC casing The lower portion of the well will be constructed using 45 feet of 0 020-inch slotted screen PVC casing A filter pack consisting of No 3 Monterey sand will be placed around the screen from the bottom of the boring to an elevation of two feet above the screen zone A two foot thick seal consisting of hydrated bentonite chips will be placed above the filter pack Above the seal a mixture of bentonite powder and cement will be placed to within two feet of grade level A traffic-rated security wellhead cover set in a concrete pad will be used to complete construction Task 11 - Vapor Extraction Test • The VET will be performed for approximately 6 hours and will involve the extraction of soil gas at variable flowrates, the monitoring of flowrate, vacuum and temperature of extracted soil gas and the monitoring of vacuum response in the vadose zone wells and selected existing groundwater monitoring wells • Collect and analyze approximately six to eight vapor samples for TPHg and BTEX using EPA test method 8015M