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Work Plan-Soil and Groundwater Remediation <br /> CSUS Multi-Campus Regional Center,Stockton,CA <br /> March 3,2003 <br /> Page 5 of 8 <br /> 4.2 SITE PREPARATION <br /> Condor will prepare dewatering well and effluent discharge permit applications and will obtain the <br /> required permits from the SCJEHD and City of Stockton prior to conducting the fieldwork. Condor will <br /> schedule and coordinate all field activities through CSUS. The proposed area to be over-excavated will <br /> be marked with white paint and Underground Service Alert (USA) will be notified at least 72 hours in <br /> *� advance of the fieldwork to locate and identify underground utilities in the vicinity of the work area. <br /> However, because utilities contacted by USA will not mark their lines past property boundaries and into <br /> a the site, it is the responsibility of the property owner to locate and identify underground utilities in and <br /> near the work area. It is Condor's recommendation that the property owner contract a private locator to <br /> accurately identify the underground utilities in and near the work area. The SCJEHD will be notified of <br /> the fieldwork schedule at least 48 hours in advance. Temporary chain link fencing will surround the <br /> excavation. In addition, traffic barricades and caution tape will be placed outside the chain link fencing <br /> and around the perimeter of the area to provide a buffer zone. <br /> 4.3 DEWATERING ACTIVITIES <br /> Dewatering of the proposed excavation area is being considered in order to remove the potential for <br /> highly impacted soil immediately below the water table. Condor is currently evaluating various <br /> dewatering techniques and considering the benefits of dewatering concurrent with excavation operations <br /> versus in-situ remediation through ozone sparging after excavation and backfill operations have been <br /> completed. Options for dewatering of the proposed excavation area include: <br /> M ➢ The installation of dewatering wells around the periphery of the excavation. The dewatering well <br /> boring/s will be drilled to a depth of approximately 50 to 70 feet bgs. <br /> �✓ ➢ The installation of dewatering wells within the excavation which will be removed as necessary <br /> during excavation. <br /> ➢ Active pumping of groundwater via the construction and operation of dewatering sumps during <br /> excavation. <br /> r Dewatering effluent will be pumped into one to three 20,000-gallon Baker Tanks and treated on-site via <br /> a� carbon filtration. The effluent will be sampled after remediation and analyzed for petroleum hydrocarbon <br /> constituents prior to discharge under permit to the city sanitary sewer, or transported for off-site disposal <br /> if necessary. <br /> 460 Prior to the commencement of fieldwork, a tailgate safety meeting will be held and a site specific Health <br /> and Safety PIan will be discussed with, and presented to, all field personnel for their signatures. All <br /> drilling activities will be performed under the supervision of a Condor geologist in accordance with the <br /> provisions of the SJCEHD and City of Stockton permits. <br /> The dewatering effluent will be analyzed for constituents by methods dictated by the Municipal Utilities <br /> L' Division pursuant to disposal. Samples will be delivered under chain-of-custody procedures to a state <br /> certified laboratory for analyses. Condor is currently evaluating the benefit of an on-site mobile <br /> laboratory for rapid processing of the samples. <br /> L <br /> L <br /> 1 j <br /> La CONDOR <br />