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Luhdorff &Scolmanini <br /> Consulting Engineers <br /> MONITORING WELL DESTRUCTION WORK PLAN <br /> SCOPE OF WORK <br /> The work to be completed as part of this work plan encompasses that which is necessary to destroy a <br /> multiple completion monitoring well(multiple piezometers within a single borehole with screen sections <br /> isolated with intermediate bentonite seals).The purpose of the work is to properly destroy the monitoring <br /> well structure to prevent vertical communication of groundwater between the aquifers penetrated by the <br /> well structure and from the ground surface. All work shall be carried out in conformance with the <br /> applicable regulations of the San Joaquin County Department of Environmental Health (SJCDEH) and the <br /> California Department of Water Resources. <br /> The monitoring well shall be destroyed using explosives placed in each piezometer. The goal of the <br /> blasting plan is to shatter the individual piezometer casings in order to allow neat cement to intrude/fill <br /> the voids in the installed gravel pack and piezometer casings, resulting in a monolithic cement structure <br /> that well prevent vertical movement of water. A blasting plan shall be prepared by licensed,experienced <br /> well destruction contractor specializing in this method of well destruction. <br /> Summary of Work to be Performed <br /> The monitoring well to be destroyed will be done so according to all applicable local and state regulations. <br /> The work generally includes: <br /> • Submission of permits to SJCDEH <br /> • Destruction of above ground feature (stove pipe enclosure, cement pad, bollards) <br /> • Excavating to a depth of five below ground surface (bgs) around the monitoring <br /> well structure and removal of existing cement seal and piezometer casings to a <br /> depth of five feet below ground surface <br /> • Placement of explosives in each piezometer <br /> • Placement of neat cement in each piezometer to bottom of excavation <br /> • Detonation of explosives <br /> • Adding of additional neat cement to the well structure until it overflows into the <br /> excavated area to form a mushroom cap. <br /> • Back filling the excavation with native fill <br /> • Site Cleanup <br /> • Submission of Well Completion Report and Records <br /> MONITORING WELL <br /> The monitoring well is a%rT completion nested piezometer well (see attached monitoring well <br /> profile). <br /> 500 First Street (530)661-0109 <br /> woadiand.CA 95776 vrWw.lsce.Corm <br />