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RPR. 8.2005 8:16RN POENV. SERVICES N0.234 P.5 <br /> Mr. Duane White <br /> March 18, 2005 <br /> Page 3 <br /> size material that flows with groundwater can be removed during the filtering process. <br /> PAHs may be sorbed to colloidal material. <br /> RECOMMENDATION <br /> Test unfiltered samples for PAHs. <br /> 6) Moniitcdng well abandonment procedures will include drilling the wells out and <br /> backfilling with grout utilizing the tremie method. This is a good approach as long as the <br /> drilling stays centered over the well casing, If the drill stem drifts off of the casing then it <br /> can-be very difficult.to got back over the casing. <br /> RECOMMEDATION <br /> During the overdrilling work utilize a stinger that will help ensure that the drill <br /> stem will not drift off of the casing being drill out. <br /> If you have any questions, please contact me at (916) 255-3709 or at <br /> irohrer@dtsc,ca.gov. <br />