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2-10-1999 12:.33PM FROM HORIZON ENVIRONMENTL 916 939 2172 P-3 <br /> Former Discovery Chevrolet I'ebruary 10, 1999 <br /> Tracy C:alifurnia _ Letter Work Plan p <br /> r <br /> Task Abandon groundwater monitoring wells MW-2through MW-5 MW-3 by <br /> ftewaWr4horhe wells using approprialely sized hollow-stem augers to the <br /> total depth of the,wells, and backfilling the former well boreholes with a <br /> beatonitelcement slurry (grout) to within six inches of surface, grade. The t <br /> grout shall be placed with a tremmie pipe, or through the hollow-stem augers, <br /> from the bottom to the top of the boring in a continuous operation. The <br /> traffic boxes shall be removed and the remaining boring volumes shall he <br /> completed with asphalt mix and contoured to existing grade. <br /> E <br /> Task 3 . Prepare and submit a report detailing f:.eld methods, results, and conclusions <br /> of the investigation. <br /> Please call horizon at (916) 939-2170 if you have ani questions regarding this Letter Work <br /> Plan. <br /> Sincerely, <br /> Horizon Environmental Inc. <br /> Gary D. Barker <br /> Senior Project Manager <br /> Kenny B. Mateik i <br /> Registered Geologist E <br /> C.F_G.No. 1935 <br /> Attachments: Figure 1, Site Vicinity Map <br /> Figure 2, Site Map 1 <br /> Horiron's Field Methods and Procedures <br /> CRWQCB-CCR, Letter dated January 27, 1999 f <br /> t <br /> c: Mr. Mark R. List Ms. Michelle Nokcs <br /> California Regional Water Quality Control Roard Antioch Toyota 44f <br /> Central Valley Region 1810 Somersville Road <br /> 3443 Routier Road Antioch,California 94509 <br /> Sacramento,California 95827 <br /> r <br /> 3001-21.1wp 2 HORIZON ENVIRONMENTAL INC. <br />