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t <br /> ,*age <br /> Mr.James Barton,RWQCB May 14,2008 <br /> Work Plan for Additional Site Assessment <br /> Former Dolly Madison Bakery,Stockton, California <br /> Page 11 <br /> Task 2C: Air Sparge Well Installation <br /> Wells AS-2, AS-3, and AS-4 will be installed through 6-inch, 7-inch, or 8-inch diameter <br /> hollow stem augers using 1-inch diameter schedule 40 PVC well casing and and 2 feet of <br /> 0.02-inch diameter factory slotted well screen, situated from approximately 30 to 32 feet <br /> bgs. A filter pack of#3 LonestarTm sand will be placed in the annular space around the well <br /> casing from the bottom of the borehole to approximately 2 feet above the top of the well <br /> screen (28 to 32 feet bgs). Approximately 4 feet of coated bentonite pellets will be placed <br /> on top of the filter pack sand to provide a transition seal for the well. Neat cement will be <br /> used to backfill the remaining annular space around the well casing. A watertight locking <br /> cap will be placed over the top of the well casing, and a traffic rated vault box will be <br /> installed around the top of the well. Diagrams illustrating the proposed construction of each <br /> proposed air sparge well are included in Appendix B. The actual well construction may be <br /> modified in the field based on conditions encountered at the time of the investigation. <br /> Task 21): Vapor Extraction Well Installation <br /> Wells VW-4, VW-5, and VW-6 will be installed through 10-inch diameter hollow stem <br /> augers using 4-inch diameter schedule 40 PVC well casing and 20 feet of 0.02-inch <br /> diameter factory slotted well screen, situated from approximately 5 to 25 feet bgs. A filter <br /> pack of#3 Lonestarrm sand will be placed in the annular space around the well casing from <br /> the bottom of the borehole to approximately 1 foot above the top of the well screen (4 to 25 <br /> feet bgs). Approximately one foot of bentonite chips will be placed on top of the filter pack <br /> sand, and hydrated with clean water, to provide a transition seal for the well. Neat cement <br /> will be used to backfill the remaining armular space around the well casing. A watertight <br /> locking cap will be placed over the top of the well casing, and a traffic rated vault box will <br /> be installed around the top of the well. Diagrams illustrating the proposed construction of <br /> the proposed vapor extraction wells are included in Appendix B. The actual well <br /> construction may be modified in the field based on conditions encountered at the time of the <br /> investigation. <br /> Task 2E: Well Destruction(Optional) <br /> Well MW-3 will only be destroyed if mandated by the City of Stockton. If necessary, well <br /> MW-3 will be pressure grouted with neat cement. Following pressure grouting, the upper 3 <br /> - <br /> feet of the well materials will be removed. Fill material will be placed to provide a stable <br /> surface, and the ground surface will be patched to match the surrounding asphalt surface. O J�,r v4�� <br /> KATimothy Kong Property\Work Plans\Kong-mayOgworkplan.dor <br />