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WE - - <br /> _.�. <br /> ^"J <br /> r 'S <br /> j <br /> 1 <br /> KEl--P88-0810.W2 <br /> May 5, 1989 <br /> Page 3 <br /> Each well casing will be secured with a waterproof cap and a <br /> padlock. A round flush-mounted well cover will be concreted <br /> in place over the top of each casing. <br /> 6. Water levels in the wells will be measured with an electro- <br /> nic sounder. The wells will be developed using a surface <br /> pump approximately one week after well completion. Wells <br /> will be pumped until expelled water is clear and free of <br /> turbidity. Effluent generated during well development will <br /> be contained in barrels and hauled from the site. by a <br /> licensed hazardous materials hauler. <br /> Well cover elevations will be surveyed to an assumed datum. <br /> 7. Ground Water Sampling: <br /> The wells will be purged with a surface bailer one casing <br /> volume (approximately ten gallons) , then EC, pH and tempera- <br /> ture will be measured and recorded. This procedure will <br /> continue until the three parameters have stabilized for <br /> three consecutive readings, after which a sample will be <br /> collected. If a well goes dry during purging, the time of <br /> recovery prior to collecting the water sample will be <br /> measured and recorded along with the water level prior to <br /> sampling. Samples will be collected using a clean Teflon <br /> bailer and will be promptly decanted into 40 ml VOA vials <br /> and one liter amber bottles as appropriate. Vials and <br /> bottles wifl be sealed with Teflon-lined screw caps, labeled . <br /> and stored on ice for delivery to a state certified labora- <br /> tory. The sampling bailer will be cleaned with soap and a <br /> clean water rinse between uses. <br /> Wells will be checked for free product and sheen prior to <br /> development and sampling. <br /> Properly executed Chain of custody documentation will <br /> -- - accompany all samples: - - - <br /> 8. Laboratory Analysesc <br /> Selected soil and all water samples will be analyzed by <br /> Sequoia Analytical, Redwood City, California, a . state <br /> certified laboratory, for TPH as gasoline and dieseland <br /> BTX&E using -EPA analytical methods recommended by the RWQCB, <br /> as specified in the Tri-Regional guidelines. <br /> Analytical results will be presented in tabular form, <br /> showing sample depths, results and detection limits. <br />