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D. The well screens, bentonite seals and neat cement seals shall be installed in <br /> accordance with the following sequence: <br /> 1 Contractor shall estimate the length of casings needed and verify with the <br /> Engineer before lowering into the boring. Well casing shall be at least 5 <br /> feet above grade. <br /> 2. Contractor shall not use couplings, or glue to join well casings. <br /> 3. Contractor shall install a PVC slip end cap or a well plug on the top of both <br /> well casings before placing the casing in the bore hole. <br /> 4. Contractor shall connect and lower the well casing assembly gently. <br /> 5. If the well casing assembly is dropped, lowered abruptly, or for any other <br /> reason suspected of being damaged during placement, the well casing <br /> assembly shall be removed from the borehole for inspection by the <br /> Engineer. The need to inspect the casing will be at the sole judgment of <br /> the Engineer. <br /> 6. If the well casing rises after being placed in the borehole, the Contractor <br /> shall not place any drilling equipment such as drill pipe, hammers, etc. on <br /> 1 the casing to prevent the casing from rising. Contractor shall notify the <br /> Engineer immediately of rising casing, and shall measure the amount of <br /> rise. <br /> 7. Contractor shall place the sand pack into the annular space around the <br /> screened interval. Clean water and a tremie pipe may be used to assist <br /> with sand pack placement. If the well assembly is installed through the <br /> hollow stem augers, the augers shall be pulled slowly during sand pack <br /> installation. <br /> 8. Contractor shall minimize bridging of the sand by pouring the sand in the <br /> bore hole gently and not in large quantity. Patience shall be exercised by <br /> the Contractor. <br /> 9. Contractor shall monitor the sand pack settlement by measuring the sand <br /> level with a weighted tape. Contractor shall also monitor the top of the well <br /> casing to detect any movement due to settlement or from drive casing <br /> removal. <br /> 10. Contractor shall periodically gently surge the water inside the well casing <br /> and screen to compress the sand pack while placing the sand. Contractor <br /> shall measure the top of the sand pack periodically <br /> 11. Contractor shall add sand shall until the sand pack is above the top of the <br /> screened interval as shown on the groundwater well figure. <br /> 12. Once the placement of the sand packed interval is completed, the <br /> contractor shall measure and record the depth to the top of the pack in the <br /> presence of the Engineer. <br /> On-Call Driller RFB 6820 San Joaquin County <br /> Groundwater Monitoring Well Specifications 7 Public Works Dept <br /> Solid Waste Division <br />