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California Regional Water Quality Control Board <br /> Central Valley Region <br /> (a <br /> 1; 3� Steven T. Butler,Chair Gra Davis <br /> Winston H.Hickox Y <br /> Secretaryfor Sacramento Main Office Governor <br /> Environmental Internet Address: http://w .swrcb.ca.gov/—mgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> 21 April 2000 <br /> Ms. Julie Raining <br /> Environmental Affairs <br /> Georgia-Pacific Corporation <br /> P.O. Box 105605 <br /> Atlanta, GA 30348-5065 <br /> CONDITIONAL WORK PLAN APPR OVAL,MONITORING WELL REHABILITATION, <br /> FORMER GEORGIA-PACIFIC CHEMICAL PLANT, TRACY,SAN JOAQUIN COUNTY, <br /> —_ CALIFORNIA-- <br /> Mr. Todd Miller of Brown and Caldwell (B&C)prepared the 4 February 2000 Monitoring Well <br /> Rehabilitation Work Plan (work plan) for three wells at the former Georgia-Pacific chemical plant at <br /> 75 West Valpico Road in Tracy. All three of these wells are on the north side of an irrigation ditch <br /> north of the former chemical plant property. <br /> One of the wells (BC-11) was damaged to 14 inches below grade in late 1994 and was sealed with a <br /> friction plug. The other two wells (BC-9 and 10) were buried beneath irrigation canal dredge spoils in <br /> spring 1995. Mr. Miller relates that the damage and burial were reported in the July 1995 semi-annual <br /> monitoring report. <br /> The work plan proposes to locate the buried wells by using the coordinates recorded when the wells <br /> were installed, and carefully removing overburden. B&C will test the integrity of these wells by passing <br /> a plug the diameter of the well casing down the well to assess any irregularities in casing structure. If <br /> any of the wells are damaged, B&C will prepare a work plan for well abandonment and replacement. If <br /> the casings are intact, seals and security boxes will be repaired, and the wells will be redeveloped and <br /> sampled. <br /> The San Joaquin County Public Health Services Department did not receive a copy of the work plan, so I <br /> discussed the plan with Mr. Michael Infurna of that department on 12 April 2000. He recommended <br /> obtaining samples before performing the well integrity test, in case the four-inch plug becomes stuck in <br /> the well hole. He also recommended assessing well casing continuity first by lowering a smaller <br /> diameter object before lowering the larger diameter object. He also reminds B&C that an inspection <br /> report needs to be submitted on each monitoring well every five years or more often, if warranted. <br /> Please send Mr. Infuma a copy of the work plan and a summary of the well integrity test results. <br /> California Environmental Protection Agency <br /> �a Recycled Paper <br />