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KL E/NFEL DER Bright People.flight Solutions. with the required fees. The permit must be approved prior to drilling activities and sampling. EHD usually requires up to two weeks for permit approval. Underground Service Alert (USA) will be contacted 48 hours prior to conducting fieldwork to notify local utilities of our proposed subsurface assessment. Please be aware that USA does not mark private utilities. Marking of private utilities is the responsibility of the client/landowner. If private utilities are of concern they should be marked by the Client and/or a private utility survey should be conducted prior to field activities. Kleinfelder will additionally prepare a health and safety plan prior to the actual field assessment. Task 2 — Advancement of Push Probes The purpose of the push probe task is to assess the extent of phosphoric acid, aluminum, and copper impacted soils associated with the phosphoric acid release noted at the Site. The total proposed depths of the push probes is 10 feet bgs, but the actual depths will be based on field observations and use of pH test strips to field test soil conditions. Therefore, some borings may be deeper than 10 feet. Kleinfelder is proposing a single day of work and the advancement of approximately eight push probes. Five to six push probes are proposed on the exterior of the building near the chiller unit and concrete utility conduit located west of the chiller unit. The exterior probes will be advanced in a semi-circular pattern and at varying distances from the estimated spill area. The actual distance of "step-out" probes from the initial spill area will be based on initial probe findings and observations. It is estimated that step- out and peripheral probes will be located 10 to 20 feet from the source area. Two to three probes will be advanced within the building area in proximity to the approximate 10-foot piping route and near the utility conduit west of the piping route. A background pushprobe will be advanced to evaluate naturally occurring background concentrations of the constituents of concern including aluminum, copper, phosphate, phosphorus and pH. The background probe will be advanced in an area with similar soil type if possible and outside of the facility operations. The actual pushprobe locations will be dependent on access, surface conditions, and potential interference with subsurface and above-ground utilities. A limited access probe machine will be used in the interior area, and a truck- mounted probe will be used in exterior areas. Based on the reported depth to groundwater, subsurface water is not expected to be encountered or sampled as part of this scope of work. Prior to the advancement of the perimeter pushprobes, the first 2 feet will be hand- augered and then a probe will be used to explore utilities up to 4 feet bgs. Pushprobes will be advanced using a pneumatically-driven steel probe. Soil samples will be obtained by inserting a sample barrel lined with acetate liners into the probe. The sample barrel will be lowered to the desired sampling interval and driven into the soil. 95642.ENV/STO9P060 Page 2 of 6 April 2, 2009 Copyright 2009 Kleinfelder