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EROM,: L&S ENVIRONMENAL PHONE NO. 707 425 5441 -Mar. 22 1998 09:47PM P2 <br /> s <br /> L • & - S -.EN V IRON MENTAL <br /> ASSESSMENT RESTORATION • FA CLOSURE <br /> March 22, 1998 <br /> Ron Rowe.. <br /> San Joaquin County Public Health <br /> 304 East Weber Ave <br /> Stockton,CA 94621 <br /> Subject:.. Monitor Well Abandonment for.the EBMUD'Maintenance Yard Facility,Lock <br /> ted at <br /> 1804 West Main Street,Stockton,CA.. <br /> Dear Ron: <br /> ISS Environmental(LSE)proposes to abandon a total of nine we.Is at the above subject site- Gregg Drilling . <br /> .of.Martinez will provide drillingservices and LSE,will provide oversight and closure documentation:. . <br /> The wells.will be abandoned by pressure grouting methods and will conform to San Joaquin County <br /> Standards. Each well will be filed with neat cement using a tremie pipe.until it flows from the surface O[tce <br /> the well column is full,grout will be applied to the well tender pressure. :A fitting will be securely aitaclted to'. <br /> each wellhead and conned to the Chemgrout pump. A continuous pressure of 30 to 45'psi will be <br /> maintained on the wellhead for approximately five minutes to force grout into the filter pack aad <br /> surrounding <br /> formation. <br /> Once the wells have been scaled the top dune fort of casing will be exposed by removing tht traffic box and : ... . <br /> surrounding soil. The casing will cut off and the exposed end will be capped with concrete and moundedthe.' <br /> prevent ponding of water. The grout and cement will be allowed.to setup and if no further settling occurs,the <br /> remaining borehole will be filled with soil cuttings. <br /> Please let me know if you have any questions.or comments. Drilling is scheduled for March 27. <br /> Ry. <br /> US Environ►nwar <br /> tt Parker;RG. <br /> Principal Geologist <br /> 4 PO.Box 737+.Suisun,C A 94585•707.427:2079 EAX.707.425.5441 <br />