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Mr. Arjuna Weragoda, P.E <br />April 10, 2019 <br />Page 4 <br />Analysis of each sample in this AOC will include BTEX and MTBE via USEPA Method 8260; <br />PAH via USEPA Method 8270; and TRPH via FLPRO. A composite of the 0- to 1- foot interval <br />and a second composite sample of the deeper interval will be analyzed for pesticides via USEPA <br />Method 8081, 8082, and 8141; herbicides via USEPA Method 8151; arsenic via USEPA Method <br />6010. <br />Groundwater Sampling <br />One boring in the Farm fuel and "spray oil" above ground storage tanks area will be converted to <br />1 -inch diameter temporary monitoring well to collect a groundwater sample for laboratory <br />analysis. The boring with the highest detected PID reading will be selected for groundwater <br />sampling. If no PID readings were detected, the northern side of the contained area will be <br />selected for well installation. PVC well screen will be installed to a depth three feet below the <br />observed groundwater or to boring refusal. The well screen will be 5 -feet long, with 0.010 -inch <br />slots installed at the bottom of the boring above which solid PVC riser will be installed to above <br />the ground surface. A small volume of water will be extracted to develop the well. <br />The temporary monitoring well will be purged and sampled as specified in FDEP-SOP-001/01 <br />FS 2200 no less than 24 -hours and no more than 48 -hours after development is completed. <br />Analysis of the groundwater sample will include pesticides via USEPA Method 8081, 8082, and <br />8141; herbicides via USEPA Method 8151; arsenic via USEPA Method 6010, BTEX and MTBE <br />via USEPA Method 8260; PAH via USEPA Method 8270; TRPH via FLPRO; and ethylene <br />dibromide (EDB) via USEPA Method 8011. <br />Following sample collection, the temporary well locations will be abandoned by backfilling them <br />with hydrated bentonite flush to the ground surface. <br />Laboratory Analysis and QA/QC Requirements <br />The samples will be submitted under chain -of -custody to Pace Analytical Services, a National <br />Environmental Laboratory Accreditation Program (NELAP)-certified laboratory for analysis <br />with a 5 -day turnaround time. All soil and groundwater samples will be analyzed by the <br />following methods, as noted above and provided in the table below: <br />• BTEX by USEPA Method 8260B <br />• PAHs by USEPA Method 8270C <br />• TRPH by FLPRO Method <br />• Arsenic by EPA Method 6010 <br />• Pesticides including organochlorine pesticides by USEPA Method 8081 and <br />organophosphorus pesticides by USEPA Method 8141 <br />• Herbicides by USEPA Method 8151 <br />• Ethylene Dibromide (EDB) <br />No QA/QC samples will be collected. <br />A summary of the laboratory samples is provided in Table 1, below. <br />TETRA TECH <br />110 <br />