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ARCADIS Ms. Lori Duncan <br /> December 3, 2010 <br /> conductor casing that could not be removed, therefore, the well box and conductor <br /> casing were left in place and filled with concrete. <br />_ Over-drilling to Depth <br /> Groundwater monitoring wells MW-4, MW-8M and MW-8D, located within planters, <br />_ were destroyed by removing the well box and well skirt at each well and over-drilling <br /> each well to their respective total depth using a drilling rig equipped with 10-inch <br /> diameter hollow stem augers with a 12-inch cutter head. Neat cement grout was then <br /> tremie piped from the total depth of the well to just below surface grade. <br /> Well construction details are included in Table 1. <br /> Surface Completions <br /> Following completion of the well destruction activities and in accordance with SPWD <br /> v encroachment permit requirements, work was performed so that the surface at each <br /> well matched the surrounding area, as described below. <br /> ARCADIS staff returned to the site on October 21, 2010 to observe work by our <br /> subcontractor, Ramsey Engineering. This work included excavation and replacement <br /> of one 3-foot by 3-foot section of asphalt in the traffic lane at the location of former <br /> F well MW-7. [n addition, on November 9 and 10, 2010, ARCADIS staff observed <br /> sidewalk panel replacement work performed by Cornerstone Environmental, an <br /> ARCADIS subcontractor. Sidewalk panels were replaced according to City of <br /> t: Stockton specifications in the locations of former wells MW-3, MW-B, <br /> MW-9M/MW-9D, MW-10M/MW-1 OD and MW-11 M/MW-11 D. <br /> Surface grade was completed with topsoil to match existing conditions at wells <br /> MW-1, MW-2, MW-4, MW-8M/MW-8D and MW-12D. <br /> Well MW-113WMW-13D was capped with concrete that was dyed black to match the <br /> existing surface of the surrounding asphalt pavement. <br /> Investigative-Derived Waste <br /> FInvestigative-derived waste (IDW) material produced during these activities was <br /> temporarily stored on site in labeled Department of Transportation (DOT)-approved <br /> 55-gallon drums pending characterization and disposal. Belshire Environmental <br /> F, <br /> Services removed the IDW from the site on November 9, 2010 and transported it to <br /> the appropriate facilities for proper disposal.The soil waste material was transported <br /> 1 <br /> G.'A4projecAENMP CA•0449316 DoWerables1Well Destuaion RaporIM _We9 Destruction Rp1_6351010950.doc Page: <br /> 314 <br /> �1 <br /> w. <br />