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PART 3 EXECUTION <br /> 3.1 PREPARATION <br /> A. Survey ground water monitoring well and soil vapor monitoring probe locations <br /> +/-0.1 foot lateral,0.01 foot vertical. <br /> B. Protect structures near the wells and probes from damage. <br /> 3.2 DRILLING FOR PIEZOMETERS <br /> A. Contractor shall provide all equipment to assure proper execution of the ground <br /> water piezometer installation. <br /> B. Install by hollow stem auger drilling method. <br /> C. A split spoon sampler shall be used to collect soil samples during drilling. <br /> 1. Soil samples will be collected at.five(5)foot intervals. <br /> 2. Soil samples shall be placed in ziplock type bags labeled with ground <br /> water monitoring well number and depth interval. <br /> D. Drilling soaps or other drilling additives may be used only with prior written <br /> approval from the Engineer. <br /> E. Contractor shall record the depth to the bottom of the ground water piezometer. <br /> 3.3 PIEZOMETER MATERIALS INSTALLATION <br /> A. All seals or fills requiring addition of water shall be prepared using potable <br /> water. <br /> B. In all cases,Contractor shall record the depth to the top of the emplaced seal or <br /> fill with reference to land surface at the ground water monitoring well location. <br /> C. The Contractor shall record the manufacturer and quantity of material used for <br /> each fill or seal for each individual ground water monitoring well installed. <br /> D. Sand pack shall be installed using gravity feed from the land surface. The sand <br /> pack shall slowly be poured into the annulus to avoid bridging. Potable water <br /> may be circulated in the well as an aid for proper sand pack installation. <br /> 1. Bentonite seals above the sand pack shall not be emplaced until well <br /> development is completed. <br /> 3.4 SOIL VAPOR MONITORING PROBE INSTALLATION <br /> A. Drive(Push) Probe rods to depths indicated. <br /> B. Install screen and casing within probe rod annulus. <br /> C. Install glass bead filter pack to six(6) inches above screen section. r <br /> 02672-3 ER.M 10/98 <br />