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-.p Mr. Harlin Knoll <br /> October 12, 1999 <br /> Page 2 of 2 <br /> A temporary well will be constructed by installing 2-inch diameter PVC piping and well screen into the <br /> boring. The well screen will extend from approximately 5 feet above to 15 feet below the measured <br /> groundwater level in the nearest well (MW5). A clean silica sand will be placed in the well annulus from <br /> the bottom of the well to approximately 2 feet above the screened interval. A temporary seal of hydrated <br /> bentonite, approximately 2 feet thick, will be placed above the sand filter pack. The well will be developed <br /> by pumping and surge/ball techniques until produced water is relatively free of sediments. A groundwater <br /> sample will then be collected from the well and analyzed for TPHG, BTEX, and MTBE. The elevation of <br /> the well casing will be surveyed relative to the existing wells to allow for determining the groundwater <br /> elevation, which will be incorporated into the groundwater gradient calculations. <br /> Subsequent to sampling and surveying the well, the licensed drilling contractor will abandon the well by <br /> removing the casing and sandpack and grouting the boring with neat cement. All solid and liquid waste will <br /> be placed in appropriately labeled and sealed 55-gallon drums pending disposal. All sampling and drilling <br /> equipment will be washed thoroughly with laboratory-grade detergent and water between uses to minimized <br /> the nctAntial ofc:oss contamination. <br /> Ground Zero will schedule the field work upon approval of this workplan by PHS/EHD and the UST <br /> Cleanup Fund. Ground Zero will obtain a drilling permit from PHS/EHD as well as an encroachment <br /> permit, including a traffic management plan, from the City of Stockton prior to initiating any field work. <br /> All field work will be performed in accordance with Ground Zero's Quality Assurance/Quality Control <br /> (QA/QC) Plan and Site Safety Plan on file with PHS/EHD. <br /> Please contact John Lane or Greg Stahl at your convenience if you have any questions or comments <br /> regarding this workplan. <br /> Sincerely, RED GFS <br /> Ground Zero Analysis, Inc. ��5 /0 <br /> .iOHN <br /> • Lr'�i�vC. <br /> 6795 <br /> John P. Lane <br /> CA egistered Geologist No. 6795 \�r"�. OQ= � W 6 GFO� <br /> r�J � 0F C AL�F� <br /> GREGORY P. <br /> Gregory P. Stahl, RG 5023 STAHL <br /> CA Certified Hydrogeologist 264 a' No. 5023 'F <br /> sl�T <br /> JPL F OF CALIF <br /> Attachments: <br /> cc: Mr. Carl Knowles <br /> Mr. Patrick D. Riddle, Esq. <br /> Mr. Mark List, RWQCB <br /> ground7.e\knowles.ham\reports\wp 1099.doc <br />