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,. California Regional. Wa'er Quality Control Board <br /> Central YalleyRegion <br /> Steven T.Btifler Chair <br /> Winston H.HwKox .. ...;: :..._ ..,. ... p <br /> Seca Main,offce :, Governor <br /> En�ironmeutal Internet Address: h1tp://—,Fwrcb.ea.govl-4wgcb5 <br /> PPro(eallon, 3443 Routier Road,Suitc A,$acratmento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-30.0, <br /> 16 lrcb 2000 <br /> Mr. John Chavez <br /> Project Director <br /> Burlington Northern, R Santa Fe Railway Co. <br /> 740 E_Carnegie Drive <br /> San Bernardino, CalifoMla 92480 <br /> REVIE'WV 0 IVOR KM.AIVFOR,E., VALUATMNOFRACK,GROUND GR0UNI?.'f« A.T.ER <br /> QUALITIr•OIL WATER SEPARATOR AND i-VAPORATIgNPOND PROPOSED BNSF <br /> S7'QCKTONfNTER1IIODAI;FAC`fLITY,S JOAQUIN COUNTY CALIFORNVA. <br /> I,krave reviewed the Workplan for Evaluation of Backgroundground Water Quality at the proposed <br /> BNSF Stockton Intermodal Facility submitted ori your behalf by TRC Enviromental`Solutions, Inc. The <br /> plan proposes to install 011e upgradient monitoring well with: a borehole to approximately 10 feet below <br /> static:water level; a 2=inch schedule 40 PVC well with 29 feet of 0.01 inch well screen installed so that <br /> 10 feet are below static water level.and 1 Q feet are;above; sand pack to 3 feet above the screen; 57feet of <br /> bentonite seal; and seal to surface with.cement-be 7 tonite.grout_ The surface completion will be a traffic <br /> rated cover with a locking well.cap <br /> T have the following concerns and comments: <br /> L The monitoring well is located down gradient from the oil water separator and evaporation pond. <br /> Groundwater flow direction at nearby sites where the board has local data is approximately north 30 <br /> degrees east, TSO degrees from the direction you are using. A sketch showing local ground water <br /> flow is attached. <br /> 2 <br /> You may cons <br /> ides installing`;a second upgrad�entwell somewhere on the projected flow path of the <br /> contarninanf, <br /> plume from Austin Road Landfill,see attached.sketch. If you need additional <br /> information concerning this plume,I recommend that you request a file review for,Austin Road <br /> Landfill.. <br /> 1 ,Well.development by pumping three well voluines may be inadequate. I recommend using a surge <br /> block,`followed by bailing the well to remov .sand and silt,repeat the surge/bail process followed <br /> by.pumping until the retain water is clear.or;or a max. isms n of two hours. I think you,w'ill find that <br /> properly developing a monitoring well is cheaper than cleaning or replacing a silted in well in a few <br /> /ears: <br /> The co=aents.on a second upgradient'well'and on W611 development are..reeormnendations,you may <br /> _ incatrporate them or not at your discretion. Relocating the background monitoring well to a site <br /> California Environmental Protectio Akency <br /> Recycled Paper <br /> ii •d SV:VT 00, zZ lnf <br />