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ALTH DEPARTMENT <br /> E <br />� NVIRONMENTAL HE <br /> SAN JOAQUIN COUNTY Unit Supervisors <br /> r....•:._„� Carl gorgman,R.E.H.S. <br /> Third Foo <br /> Donna K.Heran,R.E.H.S. 304 East WeAvenue, Mike Huggins,R.E.H.S.,R.D.I. <br /> Floor <br /> Director California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> Stockton, <br /> Al Olsen,R.E.H.S. 468-3420 Margaret Lagono,R.E.H.S. <br /> c•. r. -• <br /> P• Program Manager Telephone: (209) Robert McCiellon,R.E.H.S. <br /> qCi FORc� Laurie A.COtulla,R.E.H.S. Fax: (209) 464-0138 Mark Barcellos,R.E.H.S. <br /> Program Manager <br /> ca A4 <br /> JAMES GIOTTONINI JAN 0 3 200 <br /> i <br /> PUDI,IC WORKS DTRECTOR f <br /> CITY OF STOCKTON <br /> 425 N EL DORADO ST H. +' ' <br /> STOCKTON CA 95202 <br /> RE: 110 W SONORA,ST SITE CODE: 1253 <br /> FIRE STATION #21 <br /> STOCKTON CA <br /> t <br /> WORKPLAN:Ozone Sparg6g Sparand Additional Monitoring Well Installation Work Plan <br /> DATED: October 07 2002 . <br /> PREPARED BY: Advanced`GeoEnvironmental, Inc. <br /> APPROVED ' _ <br /> DISAPPROVED 0 o Q3 <br /> ADDENDUM A Submit by : <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN (H&S <br /> 25299.37,subd.(c)(3).): <br /> 1. Install a monitoring well with well screen from 65 feet to 70 feet bsg in the <br /> former underground storage tank area to evaluate the vertical extent of the <br /> groundwater plume. <br /> 2. Install a one-half pound oxygen/ozone generator to the existing air sparging <br /> system. <br /> COMMENTS AND CONDITIONS: <br /> 1. Submit an addendum to evaluate the effectiveness of the strategy of injecting <br /> ozone into the existing air sparging system without the benefit of using diffusers <br /> for the delivering-the ozone by microsparging. The system should be evaluated <br /> in six months after the start up of ozone injection. The work plan addendum <br /> should include a contingency plan to install a diffuser system for ozone injection <br /> as recommended by manufacturers if the proposed ozone injection strategy is <br /> deemed inadequate. <br /> 2. Install the proposed deep screened monitoring well by February 19, 2003. The <br /> proposed completion depths should be regarded as.tentative, actual depths <br /> should be determined by collecting continuous cores in the general target zone <br /> to ensure placing the screen in highly permeable strata. This portion of the work <br /> plan does not have to wait for the submission of the work plan addendum. <br /> t <br /> ;4i rr <br />