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07 June 2012 <br /> AGE-NC Project No. 95-0184 <br /> Page 13 of 14 <br /> temperature, volume of processed vapor and oxygen level)to ensure optimal destruction <br /> of recovered hydrocarbon vapors. The PID will monitor the concentrations of hydrocarbon <br /> vapors from the influent and effluent ends of the SVE unit to record before and after <br /> catalytic destruction or carbon adsorption. <br /> After start-up, the SVE unit will be monitored weekly using the PID and Dwyer DS-200 flow <br /> sensor to ensure optimal destruction of recovered hydrocarbon vapors and to monitor <br /> cleanup progress. In addition, vapor samples will be collected on a monthly basis from the <br /> influent and effluent ends of the SVE utilizing the vacuum pump on a Model 580 organic <br /> vapor meter (Thermo Environmental Instruments Inc.); the samples will be collected in <br /> Tedlar bags, placed in a container and transported under chain-of-custody procedure to <br /> a CDPH-certified laboratory for analysis. <br /> In addition, semi-annual ground water monitoring and sampling will be conducted <br /> throughout the remediation period;AGE proposes monthly measurements of ground water <br /> depth and dissolved oxygen in ground water monitoring wells at the site to determine if <br /> ground water mounding is occurring and to evaluate the effectiveness of the IAS. cn <br /> Depth to ground water and dissolved oxygen measurements will be collected on a monthly <br /> basis to determine if ground water mounding is occurring and to monitor dissolved oxygen <br /> levels within wells surrounding IAS operation. <br /> 4.8. PROGRESS/CONFIRMATION SOIL SAMPLING <br /> After approximately 12 months of operation or after efficiency of the unit has declined, soil <br /> samples will be collected from the petroleum-hydrocarbon impacted area at the site. <br /> Analytical results of the soil samples will serve to assess the remaining petroleum <br /> hydrocarbon mass and determine if continuing operation of the remediation system is <br /> necessary. <br /> Probe borings for confirmation soil sampling will be advanced to approximately 65 feet bsg <br /> using a truck mounted drill rig equipped with 8-inch augers. Soil samples will be collected <br /> ahead of the drill bit using a modified California spilt spoon sampler and related sampling <br /> sleeves. Discrete soil samples will be collected at five-foot intervals beginning at a depth <br /> of 5 feet bsg. Upon removal from the sampler, sample sleeves will be separated. Exposed <br /> ends of the second sleeve will be covered with Teflon sheets, capped and sealed with <br /> tape. Soil samples encountered in the borings will be visually classified by an AGE <br /> geologist in accordance with the Unified Soil Classification System (USCS). Additionally, <br /> soil samples will be field-screened for the presence of volatile organic compounds using <br /> Advanced GeoEnvironmental Inc. <br />