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A site-specific Health and Safety Plan (HASP) will be prepared prior to the investigation activities. The HASP will be prepared in general accordance with the Occupational Safety and Health Act (OSHA). A health and safety meeting with the utility locator and drilling subcontractors will be conducted on site prior to start of the investigation activities. A copy of the HASP will be maintained with Ash Creek personnel at the site throughout the investigation activities. Ash Creek will obtain the required well permits from San Joaquin County Environmental Heath Department (SJEHD) prior to field activities. During field work, Ash Creek will coordinate the required inspections with the SJEHD. Ash Creek will also obtain approval and/or necessary permits from the Port of Stockton and Union Pacific (UP) for completing the work. If necessary, Ash Creek will obtain flaggers to work near the railroad tracks. Monitoring Well Abandonment. Field documentation will be conducted during field activities consistent with Ash Creek Standard Operating Procedure(SOP) 1.1, included in Appendix A. Monitoring wells PS/WC-2S and PS/WC-2M will be abandoned to accommodate the proposed railroad spur. PS/WC-2M is constructed to a total depth of 34 feet bgs and includes a screened interval from 29 to 34 feet bgs. PSM/C-2S is constructed to a total depth of 19 feet bgs and includes a screened interval from 5 to 19 feet bgs. Both are completed with a flush mount well monument. Construction details are included in Appendix B. Due to the presence of dissolved-phase hydrocarbon concentrations in groundwater from PS/WC-2S, this well will be perforated by over-drilling before grouting from the bottom to the surface. Monitoring well PS-WC-2M will be pressure grouted in place up to a depth of 2.5 feet below grade, cut at a depth of 2.5 feet below grade(both conductor and well casings), capped with a Type 1/II concrete mushroom cap, and backfilled with clean fill. SJEHD will be notified prior to field work and appropriate permits will be obtained. Monitoring Well Installation. Ash Creek will oversee the installation of two replacement monitoring wells (PS/WC-2S-R and PS/WC-2M-R; Figure 2) installed using hollow-stem auger drilling techniques. The two wells will be re-located approximately 50 feet to the east of their current locations. The proposed locations are outside of the proposed construction zone, and will provide data equivalent to data obtained from ■' original well locations. Prior to well installation, each location will be cleared by hand auger to a depth of 5 feet bgs per NuStar protocols. Soil sampling will occur continuously and soil will be logged in general I' accordance with ASTM 2487/2488. Soil logging will be conducted to confirm the proposed screened intervals and field screening will be conducted consistent with SOP 2.1, contained in Appendix A. Soil samples are not expected to be collected for chemical analysis due to existing chemical data at the locations from previous investigations. The proposed screened intervals correspond to the screened interval of the existing wells and are as follows: Work Plan for Monitoring Well Relocation Page 3 NuStar Stockton Terminal-Stockton,California May la 2011 1014-10