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PUBLIC �1EALTH SERN�ICES <br /> ?ouiN <br /> SAN JOAQUIN COUNTY <br /> r. ? <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 9520 `` �'crFoaN`� <br /> 209/468-3420 G, L <br /> ROBERT A BOUST <br /> UNOCAL CORPORATION FEB 2 6 .i <br /> 2000 CROW CANYON PLACE STE 400 <br /> SAN RAMON CA 94583 <br /> RE: UNOCAL #5098 (former) SITE CODE: 2162 <br /> 5606 Pacific Ave. <br /> Stockton, CA 95207 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS- <br /> EHD) has reviewed the Quarterly Monitoring Report for the Fourth Quarter - 1996 and <br /> correspondence from your office regarding the recent meeting between UNOCAL and <br /> PHS-EHD and has the following comments. <br /> Monitoring well sampling requirements may be modified from quarterly to annually as <br /> you have requested in your February 12, 1997 letter. Your decision to accept annual <br /> sampling is conditional upon implementing monitoring well replacements as needed <br /> and the placement of soil borings in the areas just north of MW-10 and MW-11 at the <br /> end of the two year sampling period. <br /> On September 17, 1996, the annual sampling and monitoring events began. This will <br /> be the start of the two year period and annual events will be during September of <br /> 1997 and 1998. The report of each event is to be submitted to PHS-EHD by the <br /> following December 1 of the same year. <br /> At the end of the two year period (September 1998), each well with the depth to <br /> water above the screened interval is to be replaced with a new monitoring well as <br /> described in a workplan to be submitted by November 12, 1998. Included in this <br /> workplan should be a proposal to place additional soil borings in the areas of B-4, B- <br /> 5, and MW-2 as well as the areas immediately up-gradient of MW-11 and MWA0. <br /> PHS-EHD review will be immediate and the well(s) and soil borings should be <br /> installed by February 5, 1999. <br /> According to Delta College maintenance personnel, the irrigation well for the campus <br /> is scheduled to start its pumping routine in late February or early March. PHS-EHD <br /> will require UNOCAL to sample this well at the very end of the pumping cycle (about <br /> 5:30 am) just prior to its shutdown at 6 am. <br /> A Division of San Joaquin County Health Care Services <br />