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N. <br /> Union Ice Plant <br /> Phase I & Il Remedial Investigation Plan <br /> Page: 2 <br /> `r <br /> 2.0 PROJECT OBJECTIVES <br /> ® The objective of this project is to determinethe <br /> vertical and lateral extent of the total petroleum <br /> hydrocarbon contamination identified during the tank <br /> removal. The extent of the contamination plume will <br /> be defined and a feasibility study conducted to <br /> determine the most cost effective and comprehensive <br /> remedial action for the mitigation of the <br /> contamination. This investigation will encompass the <br /> entire facility. <br /> It is possible that contamination could have migrated <br /> off-site because of the tank location. <br /> 3.0 SITE WORK PLAN <br /> This Phase I & II work plan will provide a two step. <br /> soil vapor surveyof the area, . employing the rise of <br /> absorbent traps with semi-permeable.nembranes .which` <br /> retain the absorbent and restricts the entry of <br /> extraneous soil particles. See Appendix C for <br /> discussion on process. The first step will be to <br /> bracket the area of investigation for the big picture. <br /> The second step will be to isolate the bracketed <br /> positive area. (Figure 4) <br /> After the data has been evaluated soil boring and <br /> monitoring wells will be accomplished to confirm the <br /> soil. gas vapor boundaries. Approximately five <br /> monitoring wells will be installed during the course <br /> of the investigation. These monitoring wells will <br /> provide a neans of collecting further ground water <br /> samples, gradient determination across the site, <br /> formation characterization and ground water <br /> contouring. (Figure 3) <br /> ^' Soil borings will be used to confirm the source of <br /> contamination once the source is isolated. Three (3) <br /> water nonitoring-wells will be installed in an <br /> equilateral triangle a minimum of 1Ofl-foot-apart-t o - ---- - -- <br /> determine gradient. <br />