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PUBLIC(, HEALTH SERVICES �op4�IN <br /> SAN JOAQUIN COUNTY = 2 <br /> JOGI KHANNA MD,M.P.H <br /> Health Officer <br /> P.O. Box 2009 a (1601 East Hazelton Avenue) a Stockton, California 95201 <br /> C4�I F6*V`, <br /> (209)468-3400 <br /> MIKE LESCISIN <br /> DIAMOND WALNUT GROWERS INC <br /> P O BOX 1727 <br /> STOCKTON CA 95201 MAY 13 199 <br /> RE: 1050 Diamond St. SITE CODE: 1781 <br /> Stockton, CA PROGRAM ELEMENT: 2951 <br /> During a meeting at your facility March 9,1993, members of San Joaquin county Public <br /> Health Services, Environmental Health Division (PHS/EHD) and you, your attorney, Beth <br /> Dorris, and Resna Industries Consultant, Greg Stahl, discussed the closure of the 5 <br /> underground storage vaults, and the contaminants in the soil and groundwater detected <br /> through several site investigations since 1988. <br /> It appears that the issue of the vault closures has been resolved and that a closure plan will <br /> be submitted to Carol Oz of the PHS/EHD, Unit III. <br /> The 'Third Quarter 1992 Monitoring" and the "First Quarter 1993 Monitoring" reports <br /> prepared by Resna have been reviewed by PHS/EHD staff and in response to a Board of <br /> Supervisor's directive, PHS/EHD prepared a staff report to the Board, a copy of which is <br /> enclosed. <br /> Our research on the material stored in vaults 1, 5 and 6 [1, 2-Propanediol (CAS #57-556) <br /> Niagara No-Frost KY Liquid] suggests that based upon the molecular formula, ethylene <br /> glycol is most probably part of the degradation process. This may explain why your company <br /> has no record on file of purchasing an ethylene glycol product. <br /> The recent May sampling event indicates a rise in the water table although gradient appears <br /> to be constant. Sampling of the monitoring wells was limited to total and hexavalent <br /> chromium. Sampling of the constituents exceeding secondary water quality standards was <br /> not performed during this event. It will be necessary to perform a comprehensive sampling <br /> of the monitoring wells and the City of Stockton Municipal Wells #WP-1, #WP-2 and #WP- <br /> 3 at least once within a 12 month period. The modified sampling plan is acceptable for 3 <br /> of 4 quarters within the 12 month period. <br /> A Division of b Joaquin County Health Care semccs \� <br />