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Work Plan for Destruction of <br />Monitoring and Soil Vapor Wells <br />Former Ranch Market, Riverbank CA <br />Page 3 <br /> <br /> <br /> <br />Table 1: Well Construction Details – Monitoring Wells <br /> <br />Boring <br />Diameter <br />(inches) <br />Casing <br />Diameter <br />(inches) <br />Total <br />Depth <br />(feet) <br />Sand Pack Depth <br />Interval <br />(feet below surface) <br />Estimated Volume <br />of Neat Cement <br />(gallons) <br />MW-1 8.25 2 40 23-40 7 <br />MW-2 8.25 2 40 23-40 7 <br />MW-3 8.25 2 40 23-40 7 <br />MW-4 8.25 2 39.5 23-40 7 <br />MW-5 8.25 2 42 27-39.5 7 <br />MW-5d 8.25 2 70 60-70 12 <br />MW-6 8.25 2 41 28.5-41 7 <br />MW-7 8.25 2 43 28.5-43 7 <br />MW-8 8.25 2 43 28.5-43 7 <br />MW-9 8.25 2 43 26-39.5 7 <br /> <br />4.4 DESTRUCTION OF SOIL VAPOR MONITORING WELLS <br />A summary of soil vapor monitoring well construction details are included in Table 2, below. The soil vapor <br />monitoring wells, SV-1 and SV-2, were completed to a depth of approximately 6 feet bgs with the filter <br />pack placed between approximately 5.5 feet and 6 feet bgs. Both wells will be over-drilled with 7-inch <br />diameter, hollow-stem augers to remove all well construction material and will be backfilled with neat <br />cement grout. <br /> <br />Table 2: Well Construction Details – Soil Vaper Wells <br /> <br />Boring <br />Diameter <br />(inches) <br />Casing <br />Diameter <br />(inches) <br />Total <br />Depth <br />(feet) <br />Sand Pack <br />Depth Interval <br />(feet bgs) <br />Estimated Volume <br />of Neat Cement <br />(gallons) <br />SV-1 2.0 0.25 6 5.5-6.0 12 <br />SV-2 2.0 0.25 6 5.5-6.0 12 <br /> <br />4.5 SUMMARY <br />Well destruction activities will be conducted by a California C57 licensed drilling contractor under the <br />supervision of a Condor geologist. The grout will be placed in one continuous operation, if possible. The <br />volume of neat cement injected will be recorded for each well and additional grout slurry will be added to <br />the well casings as needed. Following the destruction and grouting of the wells, the well box for each <br />monitoring well will be completely removed, and the surface restored to surrounding conditions or in a <br />condition advised by the property owner. <br /> <br />The inert waste generated during well destruction (well casing, metal well boxes, concrete) will be disposed <br />of in 55-gallon drums. Any soil generated during destruction activities will be characterized through <br />laboratory analysis and disposed of at an appropriately licensed disposal facility. The waste will be placed <br />in DOT-approved containers (55-gallon drums), labeled, and left on Site pending disposal. <br />