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City of Stockton Draft Amended Report of Waste Discharge(AROWD) <br /> Austin Road Landfill Work Plan <br /> A concrete apron will be constructed around the protective casing,and will be sloped to drain <br /> away from the well. The well number will be inscribed in the concrete apron with a scribing tool. <br /> A metal plate will be affixed to the inside of the protective casing,containing the following <br /> permanently inscribed information: (1)well number,(2)date installed, (3)completed depth,and <br /> (4)screen interval. <br /> ■ The elevation of the to of the well casing will be measure b the City's licensed surveyor <br /> p g Y t3' Y <br /> relative to the known elevation established from a bench mark at the landfill. <br /> 2.2.1.4 Monitoring Well Development <br /> Following well installation,the completed well will be developed to promote aquifer flow into the <br /> well. Development will not occur until after both monitoring well installations are completed. The <br /> following general procedures will be followed: <br /> ■ Wells will be developed using a combination of surge block,bailing,or submersible pump <br /> methods. Development water will be contained in a vacuum truck or portable tank. <br /> ■ Wells will be developed until a water sample tests less than 5 Nephelometric Turbidity Units <br /> (NTU) and is relatively free of suspended material,or until the well has been purged for a total of <br /> 4 hours. At least three casing volumes of water will be removed. The bailer,surge block,and/or <br /> submersible pump will be decontaminated prior to and following each use. <br /> ■ The development water will be monitored periodically for temperature,conductivity,pH and <br /> turbidity with an Horiba U-10 Water Quality Checker. Measurements will be recorded in the <br /> field logbook. Stability of these parameters within 10%is an indicator of the completion of <br /> development. The rate of water level recovery will be monitored immediately following well <br /> development using a freshly decontaminated water level probe,and the measurements recorded <br /> in the log book. <br /> ■ After development,the two wells will be equipped with dedicated bladder pumps and inflatable <br /> packer assemblies similar to those in existing wells to facilitate well sampling. Pumps and <br /> packers will be obtained from QED Environmental Systems or equivalent. <br /> ■ All well construction and development information will be recorded in the field logbook. <br /> Monitoring well construction log forms will be completed and will be referenced in the field <br /> logbook. All development water will be containerized and disposed of following procedures <br /> discussed in Section 2.2.1.6. <br /> 2.2.1.5 Monitoring Well Sampling <br /> The four new on-site groundwater monitoring wells will be sampled as follows. <br /> ■ A decontamination,sample preparation,and support area will be set up at the wellhead. All <br /> equipment and instruments that will be placed into the well casing,or come in contact with <br /> water samples,will be decontaminated. Decontamination procedures are described in Section <br /> 2.2.2. All decontamination procedures will be recorded in the field logbook. <br /> W:\REPORTS\STOCKTON\AUSTIN\WORKPLAN.DOC Page 8 <br />