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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. <br />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. <br />Contractor shall not use couplings, or glue to join well casings. <br />3. <br />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. <br />Contractor shall connect and lower the well casing assembly gently. <br />5. <br />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. <br />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 />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. <br />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. <br />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. <br />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. <br />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. <br />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 />San Joaquin County <br />Groundwater Monitoring Well Specifications 7 Public Works Dept <br />Solid Waste Division <br />