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70 <br /> ip <br /> kc2 r <br /> a- <br /> f <br /> Grantline and ,East Roads <br /> Page 6ofa <br /> gradient map is needed to define the limits and direction of <br /> the contaminant plume. This will also aid in the design of <br /> any future cleanup plans, if they are required. <br /> RECOMMENDATIONS <br /> PHASE I <br /> Phase II Subsurface Contamination Assessment <br /> 1• Install 8 additional borings to a depth of approximately <br /> 8.5 feet, as shown on the attached Figure 4 entitled "Soil <br /> Boring Location Map". The locations are outlined in <br /> circles on the map. red <br /> 2. Visually inspect the soils for hydrocarbon contamination and <br /> screen the soils with a Photoionization Detector (PID) for <br /> total volatile compounds. Collect a sample of the soil <br /> immediately above the groundwater interface (vadose zone) <br /> using proper sampling protocol. Provide for the analysis of <br /> TPH (as gasoline)/BTEX in Borings B-1 through B-8. Provide <br /> for the analysis of TPH (as diesel) in Borings B-4 through B-7. <br /> and B-1 (near Waste oil tank). Provide for the analysis of <br /> oil and Grease and Volatile Organic Compounds for B-1. <br /> 3. In order to determine the extent of possible shallow <br /> contamination from the product lines and pump islands, 4 <br /> borings are recommended. These will drilled to a depth of 8.5 <br /> feet but the soil will be sampled and analyzed only from the <br /> interval 3.5 to 4.0 feet below grade. These are shown as <br /> orange circles on the Boring Location Map. Sorings B 4, B 6 <br /> and 3 8 will be analyzed for TPH (as gasoline) . A soil sample <br /> of the vadose zone will be collected and stored under <br /> refridgeration at the laboratory for possible future analysis. <br /> 4• Install 11 additional soil borings to a depth of 8.5 feet <br /> below grade and sample soils immediately above the <br /> groundwater interface. These samples will be stored under <br /> refridgeration at the laboratory. They will be analyzed for <br /> TPH (as gasoline)/BTEX if analysis of the samples closer to <br /> the tanks indicate contamination above action levels. These <br /> boring locations 'are labeled A, B, etc. on the Soil Boring <br /> Location Map-Figure 4. This is a more cost- and time- <br /> effective method of gathering additional data, if future <br /> analysis is required. <br /> 5. Collect ;,rater samples fxom-Borin s-:B-_ <br /> P — -- g 1,-B-3, B-7-and-analyze--- - - ---- — <br /> ----- - - -B-3-and-B <br />