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1� Temporary Pieter Installation and Destruction Work Plan <br /> City of Stockton,Regional Wastewater Control Facility <br /> Page 3 <br /> Condor, a licensed land surveyor, will survey the locations and relative elevations of the temporary <br /> piezometers collars following completion of installation activities. The temporary piezometers collars will <br /> be surveyed; with a vertical accuracy of 0.01 foot and horizontal accuracy of 0.3 foot, each referenced to <br /> a datum to comply with AB2886 (Water Code Sections 13195 — 13198). <br /> Following completion of the 14-day groundwater gradient study, the four temporary piezometers will be <br /> properly destroyed by a California Licensed C-57 contractor, under the supervision of a Condor <br /> professional geologist. The temporary piezometers will be destroyed by lifting the PVC casing and <br /> dislodging the slip caps from the bottom of the PVC screens. Bentonite slurry will be tremied into each <br /> boring using the temporary piezometers casings as they are retracted. In the event the casing cannot be <br /> lifted, the temporary piezometers casings will be over-drilled and backfilled with neat cement to within <br /> three feet bgs.Native fill will be used to complete the boreholes to the ground surface. <br /> Project Schedule <br /> Condor can initiate permitting activities immediately upon approval of this Work Plan. The drilling <br /> schedule will be dependent on the contractors' availability. Surveying will be conducted following <br /> completion of installation of the four temporary piezometers. Upon completion of field activities, and <br /> destruction of the four temporary piezometers, a closure letter report will be prepared for submittal to the <br /> SJCEHD.Please call us at(209)234-0518 with any questions. <br /> Respectfully submitted, <br /> CONDOR EARTH TECHNOLOGIES,INC <br /> i beeline Doyle f,P.G. �k 1dllCl IELIN F r. John Kramer,P.G.,HG. <br /> K1P <br /> Senior Environmental Specialist D D�n E ertifred Hydrogeologist <br /> • <br /> NO.83S5 y�S <br /> Attachments: Figure 1 —V <br /> Figure 2—Site Map wit Piezometer Locations <br /> Figure 3—Proposed Tempo er Construction Diagram <br /> PA3000_pd\3596-City of Stockmn\3596Y SRWCF Bundled ConlraClg\BO-02 RWCF Sampling\CI Contact Channel\Work Plarm\TempPin WP 7-25-07.doc <br /> 3 Survey data will be compatible with the State of California Underground Storage Tank database(GeoTracker). <br /> w <br /> is CONDO <br />