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PUBLIC NEAETH SERVES <br />SAN JOAQUIN COUNTY <br />ENVIRONMENTAL HEALTH DIVISION <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 <br />209/468-3420 <br />HUGO MONSANTO <br />THE EARTHGRAINS COMPANY <br />P O BOX 180905 <br />ST LOUIS MO 63118-8905 <br />RE: Rainbo Baking Company <br />2651 S. Airport Way <br />Stockton, CA <br />MAM JUL 161996 <br />SITE CODE: 19093 <br />San Joaquin County Public Health Services, Environmental Health Division <br />(PHS/EHD) has reviewed the first and second quarter 1996 "Quarterly <br />Groundwater Monitoring Reports" prepared by Philip Environmental for the above <br />referenced site. <br />In the first quarter 1996 quarterly report the tables showed information on <br />monitoring well MW8 from the February 12, 1996 sampling event and there was no <br />laboratory or field data sheets to support the information. In the second <br />quarter 1996 quarterly report the February 12, 1996 data for MW8 was removed <br />from the tables. There appears to be no information from MWS for those two <br />quarters and there was no explanation for it's omission. Please indicate in <br />.future reports the reason for not including this well in the monitoring <br />activities. <br />The reports state that monitoring wells MW5 and MW7 were not sampled because <br />the "onsite County coordinator elected not to have groundwater samples <br />collected". The decision to not collect samples from these wells was made by <br />Philips Environmental. PHS/EHD staff was not present during the May 1996 <br />sampling. In the future, if there is sufficient water in these wells to <br />collect a water sample, then a sample should be collected. <br />Active remediation at this site has been postponed due to anticipated changes <br />in remediation guidelines in California. Groundwater samples are being <br />diluted at the laboratory prior to analysis. In addition, the depth to <br />groundwater at this site has varied from 35 feet to 55 feet below grade. With <br />these factors in mind it is difficult to confirm that contamination levels are <br />decreasing with time. The cost effectiveness of actively remediating the <br />source area to reduce contaminant levels compared to monitoring over a long <br />period of time must be evaluated. <br />if you have any questions contact me at (209) 468-3449. <br />Donna Heran, REHS, Director <br />Environmental Health Division <br />Margaret Lagorio, Lead Senior REHS <br />Site Mitigation Unit <br />c: CVRWQCB - Beth Thayer <br />c: Philip Environmental <br />A Division of San Joaquin County Heaith Care Services <br />