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Mr. Michael J.Infuma <br /> ARCADIS June 18,2009 <br /> grouted from the bottom of the borehole to surface grade to form a"mushroom cap" <br /> at the surface of the borehole. <br /> I <br /> 2-inch Diameter Monitoring Wells <br /> Monitoring wells MW-6, MW-7, MW-8, MW-9, MW-10, MWA 1 D, MWA 2, MW-13, <br /> and MW-14 will be destroyed by removing the well box and over drilling with 10-inch <br /> OD HSA to total completion depth(total borehole depth plus 2 additional feet bgs)to <br /> remove all material(e.g.casing,filter pack,annular seal, etc.)associated with the <br /> well.The boring will then be pressure grouted from the bottom of the borehole to <br /> surface grade to form a"mushroom cap"at the surface of the borehole. <br /> Soil Cuttings and Rinsate Water <br /> Soil cuttings generated during drilling operations will be containerized in 55 gallon <br /> drums or stockpiled and temporarily stored on the subject property pending <br /> characterization and disposal. Soil cuttings will be removed by Chevron's disposal <br /> contractor to an appropriate disposal facility.Water generated during steam cleaning, <br /> and sampling of the borings will be temporarily stored in DOT-approved 55 gallon <br /> drums pending transport by Chevron's disposal contractor to an appropriate disposal <br /> or treatment facility. <br /> Reporting <br /> A report will be prepared to document the results of the destruction of onsite and <br /> offsite monitoring wells.The report will include at a minimum the following: <br /> • a summary of site conditions and background information <br /> • a scaled site plan illustrating the destroyed well locations and other relevant <br /> site features <br /> • a description of activities. <br /> Page: <br /> llarcadis-usbfficedata\Saaamento-CA1ENVICHEVRON19617116 DelivmablesNork Plan=91Temp pdMovised Work Plan for Well Destruction 339910950.doc 3/4 <br />