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GENESIS ENGINEERING& REDEVELOPMENT 6. Vertical Gradients a. Measure the vertiw«l i;iadients between the upper and deeper water bearing units The Work Plan incorporates the following documents, which are included as Appendices to this Work Plan: 1. Sampling and Analysis Plan ("SAP")—Appendix B 2. Quality Assurance Project Plan("QAPP")—Appendix C 3. Health and Safety Plan ("HASP")—Appendix D 4. Well Abandonment Work Plan—Appendix E 2.1 Task 1 —Native Soil Investigation To investigate potential impacts to the native soil beneath the DePaoli Parcel of former disposal site, 24 on-Site soil borings will be advanced at the locations shown on Figure 4. In addition, 4 off-Site, "background" soil borings will be advanced at locations selected based on the analyses in the Task 5 Tidal Study. The borings will be advanced using direct-push technology in accordance with the procedures in the Sampling and Analysis Plan (Appendix B). The on-Site borings will be advanced through the waste drilling mud into the native soil to approximately 1 foot below the groundwater interface. The 4 off- Site background soil borings will be advanced to 1 foot below the groundwater water interface. The soil core will be continuously logged for each boring in accordance with the procedures in the Sampling and Analysis Plan. Three soil samples will be collected from each boring: (i) 1 foot below the drilling mud, (ii) 3 feet below the drilling mud, and(iii) in the vadose zone immediately above the shallow water bearing unit. The soil sample will be collected in accordance with the procedures in the Sampling and Analysis Plan. Initially only the soil samples collected from 1 foot below the drilling mud will be analyzed. If constituents of concern are identified above the target lean-up levels in any of these samples, additional analyses will be conducted on the deeper samples collected from that specific location(s). Site Investigation Work Plan 9 of 18 DePaoli Property November 14,2007