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21 July 2015 <br /> AGE Project No. 14-3154 <br /> Page 12 of 15 <br /> BORING ABANDONMENT <br /> All deep soil borings will be permanently sealed to prevent vertical migration of potential <br /> contaminants. Soil borings shall be abandoned by backfilling with cement grout from the <br /> total depth to surface grade. Borings advanced below the groundwater table will be <br /> abandoned with grout utilizing tremie procedures. The top three to six inches of the <br /> boring abandonments will be completed flush to surface grade with concrete, asphalt or <br /> dirt native to the area. The SJCEHD will be notified for grout inspection at least 48 hours <br /> prior to conducting grouting procedures. <br /> TRENCHING FIELD WORK <br /> During the April investigation of the former PNA site, a sampling location reference grid <br /> was established, tied to the cover cap over a three acre area of the former waste <br /> handling area, the eastern and southern pond areas and the western property boundary <br /> at the western edge. The sampling at trenching locations involved the use of a backhoe, <br /> which trenched through the current soil cap, past or through any waste discovered and <br /> down to native soil beneath. <br /> Previous sampling locations were performed based on known (photo documented) <br /> waste handling on the property. An expanded set of sampling locations will be <br /> established and referenced to the previous sampling grid. However, the proposed set of <br /> locations considered to be exterior and explorative. AGE anticipates minor volumes of <br /> waste glass and native soil near the current surface grade. <br /> A backhoe or similar excavator will be utilized to excavate through the waste to native <br /> soil at specified locations (see trenching location map). During trenching activities of <br /> specified locations, waste/soil samples will be collected for analysis to determine <br /> possible contamination. After samples have been collected, the trenches will be <br /> backfilled following receipt of analytical results. Based on the results of the analysis, <br /> further actions will be determined as needed. <br /> All field procedures will be overseen by an AGE representative under the supervision of <br /> a California Professional Geologist. All workers present at the site will have attended the <br /> following program: Health and Safety Training for Hazardous Waste Worker — 40 Hour <br /> Training - 29 CFR 1910.120 e.3.i and T8 CCR5192 e.3.a. <br /> AGE anticipates that approximately 20 additional trenching (sampling) locations will be <br /> required to adequately fully define the horizontal and vertical extent of the waste (see <br /> sampling location map). Additional trenches may be established in surrounding areas of <br /> waste discovery; thus increasing the total number of trenches, to generate a more <br /> accurate location and thickness of the potentially buried waste. Under the sampling <br /> protocol, AGE field staff may change individual sampling locations based on site- <br /> Advanced GeoEnvironmental,Inc. <br />