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CITY OF LATHROP <br /> 7. Water for drilling operations will be available from a fire hydrant at the site. The <br /> Contractor must comply with any connection and metering requirements set forth by the <br /> permitting City. The Contractor is responsible for delivering the water to the drilling site <br /> from the assigned water source. <br /> C. Preliminary Monitoring Well Design <br /> 1.A conceptual, preliminary monitoring well design is depicted in the Figure 2 and Figure <br /> 3. Up to three piezometers may be installed in the reamed test hole with a combination <br /> of intermediate and surface seals as shown conceptually on the preliminary design. The <br /> piezometer assemblies will be equipped with appropriate centralizers to ensure that the <br /> screen intervals are adequately spaced from the borehole wall. <br /> 2. A graded gravel envelope will be placed between the casing assemblies and the <br /> borehole from the bottom of the well to the surface by the tremie pipe method. <br /> Intermediate seals, consisting of graded bentonite chips (in saturated zones and <br /> sand/cement grout in unsaturated zones), may be specified to isolate screened intervals. <br /> A sanitary/annular seal shall consist of a sand/cement grout. <br /> 3. At the completion of well development an above-ground surface completion shall be <br /> constructed, as directed by the Engineer. <br /> D. Local and State Standards <br /> 1. All drilling and well construction activities shall comply with local and State standards. <br /> If a conflict arises between the Technical Provisions and regulatory requirements, the <br /> Contractor shall immediately notify the City and not proceed until the City resolves the <br /> conflict. <br /> 2. It is the Contractor's sole responsibility to satisfy the well permitting requirements. <br /> 2.1.2 LOCATION AND LOCAL CONDITIONS <br /> The subsurface geology at the site consists of unconsolidated to semi-consolidated sand, silt, clay, and <br /> gravel. <br /> 2.1.3 DRILLING FLUID CONTROL PROGRAM <br /> A drilling fluid program shall be employed by the contractor in accordance with the following general <br /> conditions: <br /> 1. A drilling fluid control program shall be prepared by a qualified, professional drilling fluids <br /> engineer and submitted to the City for approval. Selection and use of the drilling fluid materials <br /> shall be a part of this agreement. The Contractor shall be responsible for maintaining the quality <br /> of the drilling fluid to assure protection of water bearing and potential water bearing formations <br /> LUHDORFF&SCALMANINI <br /> CONSULTING ENGINEERS 6 <br />