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<% California Regional Water Quality Control Board �-= <br /> Central Valley Region <br /> Stcvcn T-)Butner,Chair <br /> Winston FL Hickox Gray Davis <br /> Secrewtyfor Sacramento Main Office Governor <br /> Environmenral Internet Addros= http-./Iwww.swrcb.co,gov/,rwgcbS <br /> Protection 3443 Routier Road,Suite A,Sacramento,Califomia 95827-3003 <br /> Phone(916)255-3000-FAX(916)255-3015 <br /> 29 December 2000 <br /> Mr.John Chavez <br /> Project Director <br /> Burlington Northern & Santa Fe Railway Co. <br /> 740 E_ Carnegie Drive <br /> San Bernardino, California 92480 <br /> REVIEW OF REVISIONS TO THE DRAFT GROUND WATER MONITORING WORKPLAN, <br /> OIL WATER SEPARATOR AND EVAPORA,TION POND, STOCKTON INTERMODAL <br /> FACILITY,SANJOAQUIN COUNTY(Case No 440P) <br /> I have reviewed the Revisions to the Draft Ground Water Monitoring Workplan for the Stockton <br /> .Intermodal Facility submitted on your behalf by TRC Environmental Solutions, Inc. The plan with <br /> revisions proposes to install three down gradient monitoring wells with: a borehole to approximately 10 <br /> feet below static water level; a 2-inch schedule 40 PVC well with 20 feet of 0.01 inch well screen <br /> installed so that approximately 10 feet are below static water level and 10 feet are above; sand pack to 3 <br /> feet above the screen; 5-feet of bentonite seal; and seal to surface with cement-bentonite grout. The <br /> surface completion will be a traffic rated vault with a locking well cap_ Proposed monitor well MW-2 is <br /> to be located down gradient from the oil-water separator,MW-3 and MW-4 are to be located near the <br /> northwest and northeast corners respectively of the surface impoundment. These locations should detect <br /> any coziceivable release from the oil-water separator or surface impoundment. <br /> We concur with the monitor well design, the well locations, and the groundwater quality monitoring <br /> plai�- <br /> If you have any questions, please call me at (916) 255-3814. <br /> ROSS D. ATKINSON <br /> Associate Engineering Geologist <br /> Attachment <br /> cc: Mr. Allen Blodgett, TRC Environmental Solutions, Inc. Irvine, California. <br /> RDA;C:Unydocuments\BNSnwrkpinl 1_00 <br /> California Environmental;Protection Agency <br /> Recycled Paper <br /> )T 'A Rn:R Tn, q uur <br />