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f February 10, 1999 <br /> Former Discovery Chevrolet Letter\York Plan <br /> yam. Trac California - - <br />,I i <br /> Task 2 Abandon groundwater monitoring- wells MW-2through MW-5 MW-3. by <br /> overdrilling the-wells using appropriately:sized hollow-stem. augers to the <br />'+ total depth of the wells, and backfilling the former well boreholes with a <br /> 3 nt.slurry (grout) to within six inches of surface grade. The <br /> bentonite/ceme <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 be <br /> completed with asphalt mix and contoured to existing grade. <br /> Task 3 Prepare and submit:a report detailing field methods, results, and conclusions <br /> of the investigation. <br /> Please call Horizon at (916) 939-2170 if you have any questions regarding this Letter Work <br /> Plan. <br /> Sincerely, <br /> Horizon Environmental Inc. <br /> ,��u cfo�Q <br /> Gary D. Barker WER <br /> Senior Project Manager 1� <br /> Ib.1935 <br /> cm <br /> GSD <br /> GEOLOGIST Q. <br /> . OFC-'0"0Z <br /> 7 - <br /> Kenny B. a ik <br /> Registered Geologist <br /> C.E.G. No. 1935 <br /> Attachments: Figure 1, Site Vicinity Map <br /> Figure 2, Site Map <br /> Horizon's Field Methods and Procedures <br /> CRWQCB-CCR,Letter dated January 27, 1999 <br /> c: Mr. Mark R. List Ms. Michelle Nokes <br /> California Regional Water Quality Control Board Antioch Toyota <br /> Central Valley Region 1810 Somersville Road <br /> 3443 Routier Road Antioch, California 94509 <br /> Sacramento, California 95827 <br /> 3001-21.1wp 2 HORIZON ENVIRONMENTAL INC. <br />