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• <br />Mr. Ronald Brooks <br />2 March 2000 <br />Page 2 <br />G EO:SYNTEC COYSULTAWS <br />for these meetings, GcoSyntec has assumed that no formal presentation materials will <br />40 be prepared. <br />Task 2. Source Assessment <br />The purpose of this task is to attempt to locate the source or sources of the <br />dissolved VOC plume associated with the South Gifford Road Landfill. The source <br />assessment activities will be conducted in accordance with GeoSyntec's FDEP- <br />approved Comprehensive Quality Assurance Plan (CompQAP). Under Task 2, <br />GeoSyntec will endeavor to use direct -push technology (DPT) subsurface sampling (to <br />collect soil samples above the water table and groundwater tramples below the water <br />table) and on-site field screening with an organic vapor analyzerfpholoionization <br />detector (OVAJPID) and gas chromatograph (GC) in an attempt to identify VOC source <br />areas within the landfill. Up to len 30 -ft deep borings will be attempted within the <br />landfill using DPT. Please note that it may not he possible to advance the DPT to the <br />desired depth at each location due to the presence of buried obstructions. We have <br />planned to attempt to complete work which could not be performed using the DPT, with <br />conventional drilling technology (thud rotary or hollow stem, employing a split -spoon <br />collector). In total, we have budgeted for a combined total (DPT and conventional <br />drilling) of three consecutive rig days to complete this work. Given the unknowns <br />involved in drilling into a landfill, it may not be possible to complete: this work in this <br />time frame using these technologies (although we believe that three days is a reasonable <br />estimate). If we find it is not possible to complete this work as scoped and budgeted, <br />we will consult with Indian River County prior to proceeding with additional work <br />beyond the proposed budget. <br />The field screening activities will include investigation of soil and groundwater <br />within the landfill footprint upgrad'tent of n3onitoring well cluster GR -MW -02 (the area <br />of the highest measured VOC levels, based on 1999 data). Prior to fieldwork, historical <br />aerial photographs will be reviewed to locate potential source areas. C'ontirmr+tion <br />samples will be rollected as follows: <br />XK991701R000067.doc <br />