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03/26/99 FRI 16:19 FAX 916 858 0605 IT Corporation/RC 10001 <br /> • California Regional 'Water Quality Control Board <br /> Central Valley Region <br /> N111 SteveD T.Butler,Acting Chair Gray Davis <br /> Winston H.Hickoz Sacramento Main OfLee Governor <br /> seereraryfor lrntcrnatAddrzss: h11p:Ilwwwswreb.ea.govl—rwgeb5 <br /> Environm9nfal 3443 Routier Road,Suits A,Sacramento,California 95927.3003 <br /> Prorecrion Phonc(916)255-3000-FAX(916)255.3015 <br /> w `L <br /> 24 March 1999 !. <br /> Ms. Lisa Tuck nnll ` ,� 5 Zrl <br /> Pioneer Companies,Inc. `vim <br /> 700 Louisiana Street, Suite 4300 ` S <br /> Houston, Texas 77002 <br /> GROUNDWATER INVESTIGATION WORKPLAN,ALL PURE CHEMICAL CO., TRACY,SAN <br /> JOAQUIN COUNTY <br /> I have reviewed the 3 March 1999 erna�onal Technologork Plan, y Corps(IT) fo�All-Pure1-Pure Chemical Chemical Company.Company <br /> Tracy Facilir}-submitted by In gY <br /> have the folloti;zng comments: <br /> 1. A groundNN ater sample collected at least four years ago from a Geoprobe location (n chloroform and <br /> located <br /> approximately 3,200 feet north-northeast of the All-Pure facility contained 30.9 µg <br /> 1.03 µgn carbon tetrachloride, The nearest proposed groundwater sample location in the work plan <br /> ti'is 1,600 feet from GPO 12. A groundwater sample needs to be obtained adjacent to location GP012 <br /> _ for com a�ison to groundwater analytical results for samples obtained nearer the All-Pure facility. <br /> 2. The work plan states that figures summarizing the analytical data will be included in a site <br /> investigation report. Analytical data figures shall include contours showing isoconcentrations of <br /> carbon te=achlonde and chloroform. <br /> will <br /> 3. According to the work plan, a reconnaissance <br /> chemicals of concern groundwater <br /> samplingthod <br /> work plan also state be <br /> employed to assess the extent of <br /> that conclusions and recommendations will be presented in the site investigation report. The site <br /> investigation report shall include recommendations and locations for monitoring wells, if warranted, <br /> based on the results of the reconnaissance groundwater survey. <br /> 4. The work plan contains a generic schedule based on receiving offsite access. All <br /> has been <br /> negotiatins? With adjacent properties for n no latded er than 21 June 1999eriod of time to e A spec fic schedule shall be <br /> ceive offisite access. Field <br /> work outlinebe <br /> d in thus work plan shall g <br /> submitted to the Board and shall include a site investigation report submittal date no later than <br /> 27 September 1999. <br /> California Environmental Protection Agency <br />