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PUBLIC WEALTH SERN*CES <br /> P4V[N <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 °" Fb4 <br /> 209/468-3420 CUP L l.t� <br /> BARRY WILLIAMS MAY 21 W <br /> JAMS/ENDISPUTE <br /> TWO EMBARCADERO CENTER STE 1100 <br /> SAN FRANCISCO CA 94111 <br /> Re: Lincoln Center Project Night Schedule <br /> As you are aware, San Joaquin County has a Well Ordinance which requires the <br /> permitting of wells and soil borings and the inspecting of grout placement pursuant to the <br /> adopted well standards. San Joaquin County Public Health Services, Environmental <br /> Health Division (PHS/EHD) is the delegated agency to implement the well standards. <br /> PHS/EHD has worked with Levine-Fricke-Recon over the last 10 months to issue permits <br /> and perform grout inspections. Lincoln Properties, Ltd. has limited access to Lincoln <br /> Center to between the hours of 10:00 p.m. and 9:00 a.m. so that any disruption to the <br /> businesses will be minimized. Due to the time of day that on site work must be performed, <br /> PHS/EHD has elected to perform spot inspections of the CPT/PPIP work that utilizes push <br /> point technology. PHS/EHD continues to perform grout inspections of all pilot borings and <br /> well installations. <br /> The limited hours of access has recently caused problems related to the ability to install <br /> and grout an A zone conductor casing. In order to illustrate the problems, PHS/EHD has <br /> prepared a brief summary of the related activities. Work on MW203B was scheduled to <br /> start at 10:00 p.m. on May 19, 1997 with a grout inspection of the A zone conductor <br /> tentatively scheduled for 7:30 a.m. on May 20, 1997. PHS/EHD staff received a telephone <br /> call, as requested if the schedule changed, at 5:30 a.m. from Levine-Fricke-Recon staff to <br /> notify PHS/EHD that they would not have enough time to install the conductor casing, <br /> grout the casing within the borehole and cleanup before 9:00 a.m.. <br /> Subsequently, a grout inspection was scheduled for 10:30 p.m. on May 20, 1997. Between <br /> the hours of 9:00 a.m. and 10:30 p.m. the bentonite drilling fluid remained in the borehole. <br /> When PHS/EHD staff observed the emplacement of the grout only one-half of the expected <br /> grout filled the annulus between the borehole and the conductor casing. It was initially <br /> determined that because the drilling fluid had set inside the borehole during the day, the <br /> drilling fluid had thickened to such a degree that the cement grout was unable to displace <br /> the fluid. The borehole was flushed with water and after a conference regarding the <br /> grouting material, it was decided that Volcay bentonite grout would be used between 80 <br /> and 40 feet below grade and Portland cement grout would be used between 40 feet and <br /> grade. <br /> A Division of San Joaquin County Health Care Services <br />