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es F. Durkin, Gig <br />or Hydrogeologist <br />JAMES F. MAKI <br />759 <br />CERTIFIED <br />HYDROGEOLOGIST <br />Exp. 2f28/2011 <br />The wells and piezometers will be destroyed under permit and in accordance with San Joaquin <br />County Environmental Health Department requirements. An inspector will be onsite to <br />observe and record proper abandonment. A truck-mounted drill will be mobilized to the site <br />and wells will be pressure grouted in place with a volume of neat cement equal to at least 110% <br />of the well casing volume. With the exception of P-179, the piezometers were installed by <br />hydraulically pushing the casing. Therefore, pressure grouting through the screen may not be <br />effective in completely sealing these boreholes. For this reason, the casings of these piezometers <br />will be extracted by the drill rig and the open hole will be tremie grouted. Because these wells <br />have not yielded evidence of anthropogenic ground water impacts in this area, displaced water <br />will not be contained. <br />With the exception of P-102, which was damaged and buried, water levels and total well depth <br />measurements were collected from each of the wells and piezometers in February 2011 (Table <br />1). An excavator will be mobilized to uncover Piezometer P-102 to ensure proper <br />abandonment. Each well casing that is not removed will be terminated below ground surface <br />and capped with a neat cement plug. <br />Work is expected to begin in early April 2011, with initial site preparation following in May or <br />June. Please don't hesitate to call if you have any additional questions regarding this Work Plan <br />Sincerely, <br />ENVIRO MENTAL RISK SERVICES CORPORATION <br />k O'Brien <br />CEO, ERS Corp <br />Cc: Jeff Wingfield, Port of Stockton <br />Tyson Fulmer, ERS Corp <br />Attachments: <br />Figure 1: Overview Map <br />Table 1: Maritime Laydown Site Wells/Piezometers <br />Appendix A: Well Construction Logs <br />Page 2 of 3 <br /> "14 r C