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10/22/1997 11: 13 9153519357 FARR ASSOCIATES PAGE 02 <br /> FARR ASSOCIATES <br /> Environmental,Engineering and Geohydmlogy <br /> October 22, 1997 <br /> via facsimile and U.S. Mail <br /> Donald T.Bradshaw, R.G. <br /> Principal Hydrogeologist <br /> Levine-Fricke-Recon <br /> 1900 Powell Street, 12'h Floor <br /> Emeryville,CA 94605 <br /> Subject: Abandonment of Monitoring Well MW-21, Lincoln Center, Stockton, California <br /> Dear Mr. Bradshaw: <br /> In response to your letter to A.J. Birkbeck dated October l6. 1997,Lincoln Properties Limited <br /> (LPL)has specific concerns regarding Levine Fricke Region's procedures for dxe abandonment of <br /> monitoring well MW-21. Specifically, LPL is concerned with LFR's plan for the subgrade and <br /> finished surface in the parking lot, It is LPL's opinion that the topping off of the abandoned <br /> MW-21 hole with aggregate concrete will pose a problem to LPL during subsequent paving and <br /> grading of the parking area Demoliton and disposal of the aggregate concrete section will cause <br /> unnecessary efort and additional cost to LPL during repaving of the parking lot. Thus, LPL <br /> requires,at a minimum,that the following surface completion procedures be followed: <br /> I. LFR shall place a minimum of 6-inches of Caltrans Class It aggregate base and compact the <br /> aggregate base to a minimum of 95 percent relative compaction per ASTM D1557. LFR <br /> shall employ a compaction method that does not disturb or displace existing conditions <br /> surrounding the abandoned well site. Optimum moisture content of the aggregate base shall <br /> be maintained to attain the required compaction density_ Aggregate base shall be placed in <br /> the excavation to a compacted depth of 3 inches below the finished paving elevation. LFR <br /> shall place and compact the aggregate base in accordance with Caltrans Section 26. LFR <br /> shall retain an independent geotechnical testing contractor to conduct the compaction <br /> testing. LFR shall re-compact failed area(s)until all areas meet or exceed the specified <br /> density_ <br /> 2_ LFR shall place and compact a minimum of 3 inches of ashphalt concrete conforming to the <br /> requirements of Caltrans Section 39 for Type B asphalt concrete. LFR shalt verify that <br /> finished pavement gradients and elevations match the surrounding parking area elevations <br /> and grades. LFR shall compact the asphalt concrete by vibratory compacting and/or rolling <br /> to a minimum of 95 percent relative compaction per ASTM D2950. LFR shall remove and <br /> repave the failed arca(s)until all areas meet or exceed the specified minimum densities and <br /> conditions. <br /> C:IOFFICE1WPWINWROIECrS1(VINVSWORKPLANIC.FTTERSriet102t97.wpd <br /> 102 Flood Court,Folsom,California 95630 Tel.(916)351-9327;Fax(916)351-9357 <br />