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• Deionized water final rinse. <br /> Sample tubes used to collect soil samples will be Ilv a state certified <br /> analytical laboratory. One representative soil sample will be taken for analysis from <br /> each boring at the soil-groundwater interface. Brass sample tubes will be sealed with <br /> aluminum foil, capped, labelled and placed in zip-lock bags. The samples will be <br /> handled as to minimize the loss of volitiles. The samples will be transported in <br /> appropriate containers at 4° C to a state certified laboratory. <br /> Soil Samples will be analyzed for the following: <br /> _Analysis EPA Method <br /> Total Petroleum <br /> Hydrocarbons (TPH) diesel 3550 <br /> TPH gasoline 5050 <br /> Benzene, Toluene, Ethylbenzenes, <br /> and Xylenes (BTEX) $020 <br /> All down hole drilling equipment will be steam cleaned before use and between <br /> borings. Soil cuttings obtained from the drilling will be stored on site with the soils <br /> remaining from excavation until analytical results are available and an appropriate <br /> remediation strategy is found. Borings will be destroyed using a Portland <br /> cement/water grout mix containing not more than S percent bentonite by weight. <br /> 4.0 Pian for Determining Groundwater Contamination <br /> One 4" diameter monitoring well will be located as shown on Figure 1, based on a <br /> groundwater gradient directed approximately Nurth and 18"West as established at <br /> the Mobil Oil Distribution Center site located at 500 E. Grantline Road appro,cimately <br /> 500 feet to the east. The soil boring located at 1MW-1 will be converted into a four- <br /> inch monitoring well. This location is within ten feet of both excavations and is in <br /> the down gradient direction of the potential source area. The monitoring well will <br /> be constructed in the boring according to LUPI guidelines and will be constructed <br /> with Scnedule 40, flush-joint threaded PVC casing and slotted PVC screen. <br /> Appropriate sand pack will be ylaced :rom beneath the screen to approximately one <br /> to two feet above. The screened interval will be determined by a qual�f_ed person on <br /> site but is expected to be from 8 to 18 feet in depth. The well will be sealed with <br /> three feet of hydrated bentonite and grouted to the surface. The well will be covered <br /> with an appropriate monument, capped and locked. <br /> After construction, the monitoring well will be developed by bailing approximately <br /> three casing volumes of water from the well. Groundwater will be monitored for <br /> changes in color, temperature, conductivity, and pH to establish when equilibrium <br /> state has been achieved. All water from the development process will be stored on <br /> site in sealed 55 gallon drums until appropriate disposal can be initiated. <br /> 3 <br /> o� <br /> BRt'NSIN(i ASSOCIATES, INC. 4f®\o® <br />