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PUBLIC HEALTH SERVICES Aau,N <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health OffiC20108 <br /> ; <br /> 304 E. Weber Ave., Third Floor • P. O. Box 388 • Stockton, CA ' ' . %FORc��°'• <br /> 209/468-3420 <br /> WILL UCLUSIN MAILED NOV 0 91995 <br /> UNITED STATES OF AMERICA <br /> GENERAL SERVICES ADMINISTRATION <br /> 525 MARKET ST 31ST FL 9PMC <br /> SAN FRANCISCO CA 94105-2799 <br /> Re: Federal Building Site Code: 505260 <br /> 401 North San Joaquin Street <br /> Stockton CA 95202 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has reviewed "The <br /> Soil and Groundwater Investigation Work Plan" prepared by CAPE Environmental Management dated <br /> October 1995. PHS/EHD has the following comments for your consideration. <br /> The work plan included a proposal to continue the soil and groundwater investigation, since residual soil <br /> contamination was evidenced following the excavation attempt. Based on seasonal high depth to <br /> groundwater, PHS/EHD concurs with the necessity to initiate a groundwater investigation. <br /> Three soil borings were proposed, two of which to be drilled at an angle in the area west and north of the <br /> former tank area. The total vertical depth of the borings proposed will be 30 feet or to a depth 10 feet <br /> below all evidence of soil contamination, based on field observations. A soil boring, which will be <br /> converted into a monitoring well, is proposed in the area of highest observed soil contamination in the <br /> former tank area. An additional soil boring in the area of S-4 at 16 feet which was located in the eastern <br /> part of the excavation is necessary to determine the extent of contamination in this area. Sufficient soil <br /> samples should be submitted for laboratory analysis to determine the vertical and horizontal extent of <br /> residual soil contamination. Please discuss with PHS/EHD which soil samples will be submitted. <br /> Also, note that per a telephone conversation with Larry Harlan of CAPE, PHS/EHD concurs with the <br /> proposed grouting to three feet below grade for the monitoring well, based on a consideration of the fill <br /> material. The monitoring well will be finished to grade with concrete within a traffic box which will be <br /> placed approximately two inches above grade. <br /> A permit application, indicating the additional soil boring requested, and an $89 permit fee should be <br /> submitted. Please notify PHS/EHD 48 hours prior to initiating field activities, in order that a site inspection <br /> may be scheduled. If you have any questions or comments, please contact Mary Meays at (209)468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental nHealth Division <br /> Mary Meays, Senior REHS Diane . Hinson, REHS <br /> Site Mitigation Unit Supervisor <br /> MM\401 SJ <br /> cc: Elizabeth Thayer, CVRWQCB <br /> cc: Larry Harlan, Cape Environmental <br /> A Division of San Joaquin County Health Care Services <br />