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Mr. Arjuna Weragoda, P.E <br />April 10, 2019 <br />Page 3 <br />Soil Sampling and Analysis <br />Former citrus grove <br />Soil sampling will be conducted at 4 boring locations in the grove area via hand auger. Surface <br />samples will be collected at the 0- to 1 -foot interval. <br />Analysis of each sample in this area of concern (AOC) will include pesticides via USEPA <br />Method 8081, 8082, and 8141; herbicides via USEPA Method 8151; and arsenic via USEPA <br />Method 6010. <br />This sampling was included in the Work Order 2, and no additional costs are associated with this <br />subtask. <br />Former citrus grove pesticide/herbicide washout areas <br />Exact washout locations were not identified; however, washout areas are anticipated to be <br />located near the well areas, where water supplies were present. Tetra Tech will collect soil <br />samples in the vicinity of the wells located in the maintenance area and in the vicinity of the <br />corner of 4th Street and 90th Avenue. At each location a surface sample will be collected at the 0 - <br />to 1 -foot interval, and a second sample will be collected at the 1- to 2 -foot interval. <br />Analysis of each sample in this AOC will include pesticides via United States Environmental <br />Protection Agency (USEPA) Method 8081, 8082, and 8141; herbicides via USEPA Method <br />8151; and arsenic via USEPA Method 6010. <br />Farm fuel and spray oil above ground storage tanks <br />Two regulated aboveground storage tanks are present on the property. Historical records show <br />the tanks to be incompliance since the earliest available record in 1991; however, the tanks are <br />visible on the aerial photographs in the current configuration as early as 1974. Other structure in <br />this vicinity prior to 1974 may have also housed tanks for similar use. Tetra Tech will collect soil <br />samples on each of the four sides of the diked containment area. At each location a surface <br />sample will be collected at the 0- to 1 -foot interval. If PID readings are detected, a sample will <br />be collected at the interval with the highest detected PID reading. If no PID readings are <br />detected, a second sample will be collected at the 2- to 3- foot interval. <br />Analysis of each sample in this AOC will include Benzene, toluene, ethylbenzene, and xylenes <br />(BTEX) and methyl tert-butyl ether (MTBE) via USEPA Method 8260; polycyclic aromatic <br />hydrocarbons (PAH) via USEPA Method 8270; and Total Recoverable Petroleum Hydrocarbons <br />(TRPH) via FLPRO. A composite of the 0- to 1- foot interval and a second composite sample of <br />the deeper interval will be analyzed for pesticides via USEPA Method 8081, 8082, and 8141; <br />herbicides via USEPA Method 8151; arsenic via USEPA Method 6010. <br />Tank Laydown area <br />A total of 12 steel petroleum tanks were present in a row in the maintenance yard at the time of <br />the Phase I ESA site reconnaissance. Tetra Tech will collect soil samples on each of the four <br />sides of the tank laydown area. At each location a surface sample will be collected at the 0- to 1 - <br />foot interval. If PID readings are detected, a sample will be collected at the interval with the <br />highest detected PID reading. If no PID readings are detected, a second sample will be collected <br />at the 2- to 3- foot interval. <br />TETRA TECH <br />109 <br />