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ENGEO <br /> GEOTECHNICAL AND ENVIRONMENTAL CONSULTANTS <br /> I N C O R P O R A T E D MATERIALS TESTING <br /> Project No. <br /> 4545.2.002.03 <br /> September 29, 1999 <br /> Mr. Michael Infurna <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E. Weber, Third Floor <br /> Stockton, California 95202 <br /> Subject: 400 South Tracy Boulevard <br /> Tracy, California <br /> WORK PLAN FOR MONITORING WELL DESTRUCTION <br /> Dear Mr. Infurna: <br /> As requested, ENGEO Incorporated is pleased to provide this work plan for the destruction of four <br /> existing monitoring wells located in the northeast portion of the Ryland Junction development in <br /> Tracy, California. Resna installed the subject monitoring wells in 1989 for the purpose of <br /> observing and sampling ground water. These wells are no longer used and it is planned to grade <br /> the site soon; therefore, these wells need to be destroyed and abandoned as required by the San <br /> Joaquin County Environmental Health Department. At this time, two of the four monitoring wells <br /> have been located on-site. The remaining two wells have not been located and appear to have been <br /> obscured as a result of previous agricultural discing at the site. <br /> We propose to abandon the two monitoring wells that we have located onsite by overdrilling them <br /> using hollow stem augers for the full well depth and backfilling with neat cement. <br /> We plan to explore for the two missing monitoring wells during the initial site grading and <br /> stripping. Grading equipment will be utilized to excavate the area of the wells in an attempt to <br /> locate the well casing. If encountered, the wells will be over-drilled and backfilled with neat <br /> cement. If the two wells are not located during subexcavation, then we propose to cap the areas of <br /> the monitoring wells with 5 feet of engineered fill. <br /> If the scope of this work plan does not meet your requirements or you have any questions, please do <br /> not hesitate to contact us. <br /> Very truly yours, <br /> ENGEO INCORPORATED Reviewed by: <br /> A_MY9�ft_ <br /> Casey Lee Jensen Duncan R. Hickmott <br /> cc: 1 —Ryland Homes,Doug,Nazarenus <br /> 2401 Crow Canyon Road • Suite 200• San Ramon,CA 94583-1545 • (925)838-1600 • Fax(925)838-7425 <br /> www.engeo.com • E-mail:engstaffC engeo.com <br />