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Destruction of Groundwater Wells KS-7 and KI-7 Prior to well destruction, a Tri-Lock will be removed from the well KS-7 and a dedicated submersible pump will be removed from the well KI-7. Wells KS-7 and KI-7 will be destroyed by removing the top 1.5-feet from each well. Well KS-7 and KI-7 will then be pressure grouted(20-40 psi)with a tremie pipe outfitted with a rubber gasket at the end of the pipe. The tremie pipe will pump neat cement down the well until the well casing and filter pack pore space is filled with neat cement. Dudek estimates approximately 15 cu-ft of neat cement will be needed to decommission well KS-7 and approximately 20 cu- ft of neat cement to decommission well KI-7. Table 1. Well Backfill Volumes Well Casing Filter Pack Pore Total Well ID Volume(cu-ft) Volume(cu-ft) Volume KS-7 7.4 7.7 15.1 KI-7 10.7 9.6 20.4 A hole will be excavated approximately one-foot larger in diameter than the original drilled borehole and to a depth not less than 1.5-feet below ground surface. For example the excavation around well KS-7 will be at least 22-inches in diameter and the excavation around well KI-7 will be at least 28-inches in diameter. A six-inch thick mushroom cap will be installed above the destroyed monitor wells. The excavated hole will be repaired following San Joaquin County Department of Public Works Department's R-29 Trench Standard(Appendix C). Waste generated on site will be stored in labeled 55-gallon drums and disposed of at proper disposal or recycling facility. The concrete/asphalt repair will be inspected by the San Joaquin County Department of Public Works Department. If you have any questions, or require further discussion,please contact me at(760) 479- 4131. QsofESS10 Sincerely, Dudek&Associates,Inc. �` o ka 5042 Derek Reed, P.E. �< F CIVI\- ��° I i