SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

• S7ATE (:,-CALIFORNIA _ _ _ _ GEORGE DEUKMEJIAN. Governor CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD- j , CENTRAL VALLEY REGION 3201 S STREET �� rl a`• SACRAMENTO,CALIFORNIA 95816-7090 PHONE: (9161445-0270 18 September 1986 SEP 2 5 lyjy� ENVIRO. FERry TjSERVi�ESLTy Mr. Doug Dutton Georgia-Pacific Corporation Post Office Box 10565 Atlanta, Georgia 30348-5605 GEORGIA-PACIFIC CHEMICAL PACKAGING PLANT, TRACY, SAN JOAQUIN COUNTY Thank you for your letter of 16 June 1986 proposing future cleanup and monitoring efforts at the subject site. Please refer to this office' s 14 February 1985 letter addressed to Mr. G. Fred McCaig of Georgia-Pacific (GP) . In this letter the cleanup level for chloroform in the ground water was set at 0.2 ppb. Your letter refers to maximum levels of 40 ppb outside the influence of the recovery well . Enclosed is a memorandum which reflects staff' s position on the cleanup level of chloroform in ground water. According to GP' s weekly pond reports for the six-month period between October 1985 and April 1986, chloroform concentrations at the stripper discharge are consistently less than 1.0 ppb. During this same time period, Brown and Caldwell ' s analysis shows this effluent consistently having less than 0.5 ppb chloroform. Samples taken from the extraction well over this same six-month period have had chloroform concentrations ranging from 40 ppb+ to 460 ppb+. In light of these figures, it appears that the cleanup level goal of 0.2 ppb can be obtained with the treatment technology currently being used. Because there are chloroform concentrations greater than the ground water cleanup level goal of 0.2 ppb outside the influence of the recovery well a larger cleanup area is required. The areas proposed in Alternatives 3 and 4 of Brown and Caldwell ' s January 1986 report "Evaluation of Ground Water Cleanup Alternatives" may be more appropriate to approach adequate decontamination of the ground water. We have studied your proposal to cut back on the monitoring well sampling program and feel that most of the wells you designated for abandonment are strategically located. These wells continue to, or have the potential to, be valuable sources of plume information and cleanup progress. We request, therefore, that you continue sampling of all the existing monitoring wells.