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Mr. Himanshu H. Mehta, P.E. <br />7 July 2014 <br />Page 4 <br />original concentration is confirmed then the stepout samples will be analyzed in two steps (5 ft <br />stepouts, then 10 ft stepouts, if needed). <br />Budget has been included for analysis of up to a total of 68 samples. Each soil sampling location <br />will be surveyed for northing and easting using a Global Positioning System (GPS) unit with <br />sub -meter accuracy. Soil samples will be collected in accordance with FDEP SOPs. It has been <br />assumed that this effort can be completed within five days with a two -person field team. <br />Subtask B: LFG Investigation <br />This subtask includes the completion of a LFG investigation at the Site. Based on the observed <br />depth to groundwater at the Site over the past two years, it has been assumed that the water table <br />is present at approximately 3 to 5 ft BLS. The LFG investigation will be focused on the interval <br />from land surface to the water table (i.e., vadose zone). Temporary LFG monitoring wells will <br />be constructed of diameter pre -packed poly -vinyl chloride (PVC) wells with 5 ft or less of <br />slotted screen and installed with a track direct -push technology (DPT) rig. This proposal <br />includes installation of up to eight LFG monitoring wells at locations based on results of the <br />historical records review, previous observations, and observations from the soil sampling, cover <br />thickness, presence of waste evaluation results, and areas of potential development. The wells <br />will be completed at the surface as a stickup with a sampling port at the top of the well. Tubing <br />will be attached to the sampling port and a gas analyzer (such as a GA -2000) will be attached to <br />the tubing to measure the concentrations of methane, oxygen, carbon dioxide, carbon monoxide, <br />and hydrogen sulfide in the soil gas. The concentration of VOCs in the soil gas will be measured <br />using a PID. Since there are historical VOC groundwater impacts at the Site, if VOCs in the soil <br />gas are observed, up to three samples will be collected for submittal to the analytical laboratory <br />for analysis of VOCs. Each LFG well location will be surveyed for northing and easting using a <br />GPS unit with sub -meter accuracy. It is anticipated that this effort will take two days with one <br />person in the field. <br />Task 4 — Reporting: Under this task, Geosyntec will perform data evaluation activities and <br />prepare an assessment report. Data evaluation activities will include database management, <br />screening results against applicable regulatory criteria, and GIS figure preparation. The results <br />of assessment activities will be discussed and supported by attachments containing field notes <br />and observations, photographs, analytical results, and other applicable materials. The report will <br />incorporate the preliminary assessment results and the results collected as part of the activities <br />described herein. An evaluation of the human health risk related to the potential site end -uses <br />will be included in the report. The draft report will be submitted to IRC SWDD for review. <br />SCHEDULE <br />Geosyntec will begin planning the assessment activities upon authorization of this proposal and <br />should be able to initiate the fieldwork within approximately four to six weeks based on <br />subcontractor availability. The field activities are anticipated to take seven days (five days with <br />XR 14096\XR 14053 -RE V. docx <br />engineers 1 scientists 1 innovators <br />