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, r <br /> f U.S.A. PETROLEUM CORPORATION <br /> GETTLER - RYAN INC <br /> „ SCOPE OF WORK <br /> - joBs - 9473 THRU 9495 <br /> I . Background Review <br /> A. Location History <br /> 1 . Previous land use _ dumps, landfill , etc. <br /> 2. Construction/tank installation dates - old tank locations. <br /> 3. Type of underground tanks and product storage. <br /> 4. Leak/spill locations and durations ( if applicable) . <br /> 5. Product types and amount lost ( if applicable) . <br /> E II . Observation Well Installation <br /> A. Obtain necessary permits. <br /> B. Drilling and well installation. <br /> 1 . Soil borings will be installed at each pump island and at <br /> 30 foot intervals between the pump islands and the tank <br /> excavation along the product line trench. Additional <br />' borings should be made at individual tank excavations <br /> ( i .e. waste oil , fuel oil ) . Each boring should extend to <br /> 20 feet. Soil samples will be obtained every 5 feet. If <br /> groundwater is encountered within 20 feet , the borings <br /> should be extended ( if needed) , and completed as observation <br /> wells. The borings and wells should be installed in down <br /> gradient locations. <br /> 2. Two observation wells will be installed at the down gradient <br /> side of the ' tank complex. bo not install the wells in the <br /> tank backfill material . If the location has no leak history <br /> and groundwater is not encountered by 45 feet , the holes will <br /> be grouted. . If the location has a leak history, drilling <br /> should continue until groundwater is encountered but not to <br /> exceed 10O feet. If groundwater is not encountered the hole <br /> should be grouted and the second hole need only extend to <br /> 20 feet. Soil samples will be taken every 5 feet . <br /> 3. Install observation wells in any abandoned tank excavations <br /> ( if applicable) . <br /> 4. Install observation wells in any obviously contaminated areas <br /> ( if applicable) . <br /> 5. All casings, fittings and augers will be steam cleaned before <br /> i any usage of same. <br /> 6. Hand excavate each well/boring location, minimum 12 inches <br /> x 12 inches x 4 feet deep, to insure that no underground <br /> utilities or piping are encountered during drilling. <br /> 7. Since the station lots are all concrete, saw cut all excavated <br /> areas before setting new concrete. <br /> 8. Install locking caps and locks on all observation wells <br /> immediately upon completion. <br />