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I <br /> u Treadwell&Rolb <br /> MEMORANDUM <br /> TO: Vicki McCartney, REHS <br /> FROM: David Dixon, P.G. <br /> DATE: 1 April 2005 <br /> PROJECT: Former County Motor Pool Site <br /> 130 North Hunter Street, Stockton <br /> SUBJECT: Description of Proposed Dewatering Procedures for Caisson Construction <br /> This memorandum presents a description of proposed dewatering procedures for caisson <br /> construction for new construction at 130 North Hunter Street in Stockton. It is our understanding <br /> that the new construction involves constructing 36-inch wide caissons between 20 and 524eet <br /> deep. Figure 1 shows the proposed caisson locations and depths. The figure also shows the area <br /> where contaminated groundwater could be encountered. <br /> Groundwater extracted from caissons in the potentially contaminated area is planned to be <br /> contained in tanks onsite pending analytical characterization, and either released to the sanitary <br /> sewer in conformance with the conditions of a permit from the Stockton Municipal Utility <br /> Department, or sent off-site to an appropriate wastewater recycler. Soil cuttings from the <br /> potentially contaminated area will be sent to an appropriate landfill. The soil and groundwater <br /> investigations have not identified contamination in other parts of the site, but if odors are noted <br /> in the soil or groundwater from other caissons, than they shall be evaluated for contamination. <br /> Please contact me with any questions or comments. <br /> Treadwell & Rollo, Inc. Environmental & Geotechnical Consultants <br /> 555 Montgomery Street, Suite 1300, San Francisco, CA 94111 <br /> Telephone (415) 955-9040 Facsimile (415) 955-9041 <br />