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KL E/NFEL DER Bright People.Right Solutions. applications for submittal to EHD along with the required fees. The permits must be approved prior to field activities and sampling. EHD usually requires one to two weeks to issue the permits. The push probe subcontractor and/or Kleinfelder will contact Underground Service Alert (USA) 48 hours prior to conducting fieldwork to notify various utilities of our proposed subsurface assessment. Kleinfelder will additionally prepare a health and safety plan prior to the actual field assessment. Task 2 — Advancement of Pushprobes The purpose of the push probe assessment will be to collect additional background groundwater information in the newly proposed and expanded LAA No. 7R. OLWD has expressed interest in conducting multiple groundwater sampling events from these temporary well points presumably in the third quarter of 2010. These temporary well points are also proposed to be destroyed in the third quarter. The total proposed depths of the push probes are 25 feet bgs, but the actual depth/s will be based on field observations of first encountered groundwater. Therefore, some borings may be deeper or shallower than 25 feet-bgs. Kleinfelder is proposing a single day of work and the advancement of approximately four push probes, approximately evenly spaced throughout the elongated strip area of LAA No. 7R (See Plate 2). Former TW-1 data will be used to support the additional groundwater information that will be obtained. The actual push probe locations will be dependent on access, surface conditions, and potential interference with subsurface and above-ground utilities. Prior to the advancement of the push probes, the first 4 feet will be hand augered to assess potential underground utilities. Push probes 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. To reduce the potential for cross- contamination, core barrels and associated down-hole equipment will be cleaned prior to advancing each probe. Soil samples will be collected continuously during the advancement of the push probes at depths ranging from near surface to the proposed maximum depth of approximately 25 feet bgs. During the advancement of the borings, soil samples will be collected for lithologic classification based on the Unified Soil Classification System. Once the probe has been advanced approximately 10 feet below first encountered groundwater, a 1-inch diameter and 10-foot long screened PVC pipe, attached to blank PVC sections, will be lowered into the probe. The annular space between the PVC casing and the wall of the boring will be backfilled with engineered 2/16 clean sand to approximately 2 feet above the top of the perforated sections. Groundwater will enter 48093.E01/ST010R109 Page 2 of 6 March 26, 2010 Copyright 2010 Kleinfelder