SITE INFORMATION AND CORRESPONDENCE

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Teo, Jim • From: Jim Barton Dbarton@waterboards.ca.gov] Sent: Wednesday, February 13, 2008 6:48 AM To: So, Charlie Cc: Metzinger, Charles; Wynne, Dan; Teo, Jim; Iduncan@sjcehd.com; nhenderson@sjcehd.com James Munch Subject: RE: The Transmission Shop Site at 515 W. Charter Way, Stockton Hi Charlie, thanks for your response. Please provide a schedule for the field work when it is finalized. Jim Barton >>> "So, Charlie" <Charlie.So@shawgrp.com> 2/12/2008 1:48 PM >>> Hi Jim, Per your request, we contacted the San Joaquin County regarding the proposed well installation approach. The basic response from the County is that they do not have any issue with the proposed approach so long as there will be a minimum of 2-inch annular clearance between the 6-inch drive casing and the 2-inch well casing. To accommodate this requirement, we have since adjusted the lower (telescoping) drive casing to be of nominal 7 5/8-inch. With a slightly larger lower casing, the upper (conductor) drive casing has also been adjusted to be of at least nominal 11 3/4-inch. This proposed approach will be acceptable to the County based on the communications with Margaret Lagorio, who is the contact person for the drilling permit application. A copy of the email communications with the County is included for your reference. As for the three new wells along Lincoln Street, their originally proposed locations would actually be in the sidewalk (see attached photo) . At this time, we are planning to shift their locations few feet west to stay out of the sidewalk (also shown in the attached photo file) . At any rate, we will verify the final well installation locations after the completion of the subsurface utility survey and will document their adjustment if any in the report. With respect to utility clearance, it is our standard procedure to clear the drill hole by hand augering or air knifing to 5 feet below ground surface. This is in our Company's Health and Safety Policy and will be explicitly described in our Site-Specific Health and Safety Plan being prepared for this field work. We will provide this information in the application for the drilling permit to the County. We trust that this should address your questions and comments on our proposed change to the well installation approach at the Transmission Shop site. We will proceed with the new approach as described until we hear from you otherwise. Best regards, Charlie So, P.E. Sr. Project Engineer Shaw Environmental & Infrastructure 4005 Port Chicago Highway Concord, CA 94520 925.288.2345 direct 925.288.0888 fax www.shawgrp.com -----Original Message----- From: Jim Barton [mailto:jbarton@waterboards.ca.gov] Sent: Monday, February 11, 2008 12:35 PM To: So, Charlie; lduncan@sjcehd.com; nhenderson@sjcehd.com Cc: Metzinger, Charles; Wynne, Dan; Teo, Jim; James Munch Subject: RE: The Transmission Shop Site at 515 W. Charter Way, Stockton I