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TEMPORARY PIEZOMETER INSTALLATION <br /> AND DESTRUCTION WORK PLAN <br /> c <br /> City of Stockton Wastewater Control Facility <br /> Stockton, California <br /> San Joaquin County <br /> Condor Project No.3596Y <br /> July 25,2007 <br /> Introduction <br /> Condor Earth Technologies, Inc. (Condor) has prepared this Work Plan to describe the installation, and <br /> subsequent destruction, of four temporary piezometers at the City of Stockton (City) Regional Wastewater <br /> Control Facility (RWCF) located at 2500 Navy Drive in Stockton, California, as shown on Figure 1 — Site <br /> Map, attached. The City proposed the installation of four temporary piezometers in order to conduct a <br /> voluntary two-week groundwater gradient study- designed to determine the gradient direction and <br /> magnitude near the RWCF's Chlorine Contact Channel (Channel) located southwest of the San Joaquin <br /> River(SJR). The temporary piezometers will be destroyed immediately upon conclusion of the proposed <br /> groundwater gradient study. <br /> Groundwater investigation activities will include boring permit application submission, site preparation, <br /> and installation activities for four temporary piezometers including: drilling, temporary piezometer <br /> construction, and surveying. Following the installation of the four temporary piezometers, a data <br /> transducer with data logger will be installed in each temporary piezometer to continuously record the <br /> groundwater level at each location. At the end of the 14-day groundwater gradient study period, the data <br /> will be retrieved, the pressure transducers removed, and the temporary piezometers will be properly <br /> destroyed in accordance with San Joaquin County Environmental Health Department (SJCFHD) and <br /> State of California regulations. <br /> This Work Plan provides a description of the proposed field procedures to install and survey the proposed <br /> temporary piezometers; procedures to install, operate, and maintain the data transducers in each <br /> temporary piezometer; and proposed field procedures to destroy the temporary piezometers upon <br /> conclusion of the 14-day groundwater gradient study. All work will be performed under the direct <br /> supervision of a Professional Geologist in the State of California. <br /> Permitting and Site Preparation <br /> Condor will complete a boring permit application to install and subsequently destroy the temporary <br /> piezometers and obtain the required permits from the SJCEHD prior to beginning fieldwork. The project <br /> site boundaries and proposed temporary piezometer locations will be marked with white paint and <br /> Underground Service Alert (USA) will be notified at least 72 hours in advance of the fieldwork to locate <br /> and identify underground utilities in and near the work area. The City's Municipal Utilities Department <br /> (MUD) will provide Condor with the locations of any on-site utilities not marked by USA prior to <br /> commencement of drilling activities. All drilling activities will be scheduled and coordinated through the <br /> SJCEHD and MUD. Prior to commencement of fieldwork, a tailgate safety meeting will be held and a <br /> 1 Groundwater sampling and laboratory analyses will not be conducted during the proposed groundwater gradient <br /> study. <br /> &Oo�A <br /> +i 1� CONDOR <br />