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PUBLIC HEALTH SERVICES <br /> a ..a <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> 445 N. San Joaquin Street • P.O. Box 388 • Stockton, CA 95201-0388 ��CiFppecs' <br /> (209) 468-3420 <br /> RICHARD CALLISTRO <br /> SAN JOAQUIN COUNTY CAPITAL PROJECTS <br /> 222 E WEBER AVE RM 678 <br /> STOCKTON CA 95202 MAR 1419941 <br /> RE: San Joaquin County Human Services Building SITE CODE: 1257 <br /> 145 South Sutter Street <br /> Stockton CA 95202 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> has completed review of the "Quarterly Groundwater Monitoring Report for Fourth <br /> Quarter 1993" which was dated February 4, 1994 and prepared by Weston. PHS/EHD <br /> has prepared the following comments for your consideration and action. <br /> Groundwater samples were collected on October 7, 1993 for analysis. The results <br /> indicated that MW4 and MW8 continued to evidence contamination. The groundwater <br /> gradient was determined to be aligned in a southwest/northeast trough across the site. <br /> Weston did include conclusions which suggested that the documented contamination did <br /> not come from the former tanks that were located beneath the site. However, Weston <br /> did not provide any information to suggest which off site sources could be contributing to <br /> the problem. Weston began working for San Joaquin County (SJC) on this site in 1988 <br /> and should have a thorough knowledge of potential nearby sources. <br /> After an extensive review of PHS/EHD underground storage tank (UST) files including: <br /> 145 S. Sutter (USTs 1-3 and 6-9) property owner - SJC; <br /> 125 S. Sutter (145 S. Sutter USTs 4 and 5) property owner - SJC; <br /> 134 S. Sutter (USTs 1-5) property owner - City of Stockton, <br /> PHS/EHD has determined that residual soil contamination exists which may pose a <br /> contamination threat to groundwater. <br /> You were informed in correspondence dated May 12, 1992, June 12 1992 and August 19, <br /> 1992 that additional soil investigation, to define the extent of soil contamination, would <br /> be necessary. Until such time as the full extent of soil contamination associated with the <br /> former USTs located on site has been defined, it will be difficult to conclude that the <br /> contamination evidenced in monitoring wells is from an off site source. Please submit a <br /> work plan by June 30, 1994 to continue the soil investigation. <br /> A Division of San Joaquin County Health Care Services <br />