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0 <br /> 7. Height above the ground surface of the top of the PVC well casing <br /> 8. Height above the ground surface of the top of the steel protective casing <br /> 3.04 WELL DEVELOPMENT <br /> A. The Contractor prior to development shall sound the depth to the bottom of the <br /> well, and if sand or sediment are present inside the well, it shall first be removed <br /> by bailing. The Contractor using a combination of bailing, surging, and pumping <br /> techniques shall develop the well. <br /> B. The Contractor shall begin development by first gently surging followed by <br /> bailing or pumping. This is then continued with alternate surging and bailing or <br /> pumping. At no time shall the surge block be forced down the well if excessive <br /> resistance is encountered. The bailer shall not be allowed to free-fall or descend <br /> rapidly such that it becomes lodged in the casing or damages the end cap on the <br /> bottom of the well. <br /> C. The discharge water shall be periodically collected and checked by the Contractor <br /> for clarity and total settable solids (TSS) with an Imhoff cone. Development is <br /> considered complete when the discharge water is relatively clear, the TSS reading <br /> is at or below 150 parts per million by weight (0.075 ml of material in the Imhoff <br /> cone), and a minimum of three well volumes of water have been removed. For <br /> slow recharging wells, development is considered complete upon removal of the <br /> minimum of three well volumes. <br /> D. The Contractor shall obtain a water level measurement at the completion of the <br /> well development process. <br /> E. The Contractor shall record the following well development information on the <br /> Driller's Log or a separate Well Development Record: <br /> 1. Method of development <br /> 2. Volume of water removed <br /> 3. Water levels (including the time of measurement) <br /> 4. Physical description of the water (e.g., discoloration, clarity, odor, etc.) and <br /> solids removed from the well <br /> 3.05 Collecting vadose zone soil gas and hydropunch samples <br /> A. Three vadose zone soil gas samples will be collected in each of the off site <br /> borings. The borings are to be located to the north of the landfill across Corral <br /> Hollow Road, east of the landfill across Interstate 580 and northeast of the landfill <br /> Corral Hollow EMP WP.DOC Page 7 o/8 February 28,2007 <br />