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• <br /> PLATE I <br /> PROPOSED WORKPLAN <br /> The following workplan is designed to determine the lateral <br /> limits of groundwater contamination to the northwest , north, <br /> northeast, southeast, and southwest . Private residences west of <br /> Castle Motors precludes the placement of a sample point an that <br /> direction We believe that sax (6) sample points should be <br /> sufficient to delineate the plume . Those 6 locations are shown <br /> on PLATE II <br /> 1 . After receiving pre-approval from the Cleanup Fund staff, we <br /> will obtain necessary encroachment permits from the City of <br /> Stockton, and drilling permits from the County EHD. <br /> 2 Mobilize small diameter soil probe equipment capable of <br /> taking discreet groundwater samples . The approximate locations <br /> of the soil probes are shown on PLATE II The actual locations <br /> may vary depending upon surface restrictions and underground <br /> utilities <br /> • 3 Tools will be advanced to 40 ' bgl or until water is <br /> encountered At that time, the hydropunch-type tool will be <br /> opened, and sufficient water samples collected for analysis . The <br /> hole will be grouted with a cement/bentonite slurry from bottom <br /> to the surface after completion. <br /> 4 The above operation will be repeated at each of the other <br /> locations . <br /> All field operations will be supervised as necessary by qualified <br /> professionals . <br /> Upon completion of the work, the preserved water samples will be <br /> transported under chain of custody to a State Certified labora- <br /> tory with instructions to analyze for BETX/MTBE & TPHg using San <br /> Joaquin County & Tri-Regional procedures and detection limits <br /> Upon receipt and analysis of the results of the work, a report <br /> will be pre ared and submitted to the County EHD for review and <br /> comme <br /> i <br /> Wm ter & Associates <br /> CC S . Valentine <br /> i <br /> 3 <br />