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PURI HEALTH SERICES �0..... !N CQ <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 4�tFCA' <br /> 209/468-3420 C F-7\(`�ls���( <br /> PENNY SILZER <br /> UNOCAL <br /> 2000 CROW CANYON PL #400 AlOR 1 4 1995 <br /> SAN RAMON CA 94583-1367 <br /> Re: Unocal Bulk #0788 SITE CODE: 1597 <br /> 8203 West Eleventh Street <br /> Tracy CA 95376 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has completed review <br /> of the "Revised Groundwater Monitoring Program Recommendations" dated March 27, 1995 and prepared <br /> by Pacific Environmental which included the "Quarterly Data Report" dated March 7, 1995 and prepared by <br /> MPDS. PHS/EHD has the following comments for your consideration. <br /> The recommendation to revise the groundwater monitoring program is denied as presented; however, <br /> PHS/EHD does approve the following modifications to the quarterly monitoring requirements: <br /> 1) All monitoring wells should be gauged quarterly to determine groundwater elevation and <br /> gradient direction. <br /> 2) Monitoring wells, U1, U2, U3, U5, U6, U7 and U8 should be sampled semi-annually in <br /> February and October, and <br /> 3) Monitoring wells, U4, U9, and U10 should be sampled annually. <br /> The quarterly monitoring report included the results of the February 13, 1995 sampling event which continued <br /> to evidence groundwater contamination. <br /> If you have any questions regarding the approved groundwater monitoring program revision, please contact <br /> Mary Meays at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> /�M1_0u� <br /> Mary Meays, Senior REHS 11Lt L Diane M. Hinson, <br /> Site Mitigation Unit GG Supervisor <br /> MM/8203ELE/A <br /> cc: Elizabeth Thayer, CVRWQCB <br /> cc: Wendy Cohen, CVRWQCB <br /> cc: Joseph Muzzio, Pacific Environmental Group <br /> A Division of San Joaquin Countv Health Care Services <br />