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PUBLIC 1--iEALTH SERV-rCES PaUIN <br /> SAN JOAQUIN COUNTY <br /> z. <br /> ENVIRONMENTAL HEALTH DIVISION y _ < <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 E. Weber Ave., Third Floor • P. O. Box 388 * Stockton, CA 95201-0388 °Ri;Foa`P <br /> 2091468-3420 <br /> DEC 0 6 rg�"E; <br /> PETER WALLACE <br /> PO BOX 99308 <br /> STOCKTON CA 95201 <br /> RE: HESS-DUBOIS Cleaners (AKA: Prestige Cleaners) SITE CODE: 2504 <br /> 348 W. Harding Way <br /> Stockton, CA 95204 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS-EHD) <br /> has reviewed the Quarterly Monitoring Report for the Third Quarter-1996 and has the <br /> following comments. <br /> In recent conversations with the Central Valley Regional Water Quality Control Board <br /> (CVRWQCB) concerning this site, it was decided that due to the site specific history of <br /> this site for the long time period of its operation, a groundwater analysis for <br /> Halogenated Solvents (EPA Method 601) should be included in the next quarterly <br /> sampling event for MW-2 and MW-3R. <br /> With consistent interference in the laboratory methods noted for most of the previous <br /> sampling events, PHS-EHD feels that a better understanding of the site would be <br /> obtained if these historically used dry cleaning solvents were analyzed for in the two <br /> wells onsite that have the highest groundwater contamination. Please include the <br /> original full-range chromatography for this analysis in the next quarterly report <br /> submitted to PHS-EHD. <br /> It is the intention of PHS-EHD to verify both the source of the groundwater <br /> contamination and the extent of the down-gradient groundwater plume. PHS-EHD <br /> agrees with your consultant's recommendation to advance additional soil borings and <br /> obtain groundwater grab samples from the northeast and extreme southeast quadrants <br /> of the site (inside the building). The westerly quadrant has been adequately defined by <br /> MW-5 for now and PHS-EHD sees no need to place any borings in this quadrant as <br /> your consultant suggested. <br /> Please continue to quarterly sample all of the wells associated with this site and include <br /> the new analysis for MW-2 and MW-3R in the Fourth Quarter-1996 sampling event. <br /> Currently no open boring permit is on file for this site. in order to proceed with the <br /> accepted recommendations included in this most recently submitted Quarterly Report, <br /> A Division of San Joaquin County Health Care Services <br />