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PUBLIC HEALTH SERVICES o. <br /> SAN JOAQUIN COUNTY a <br /> JOG[KHANNA M.D.,M.P.H. <br /> Health Officer <br /> O'iz:&ii <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) Stockton, California 95201 <br /> (209)468-3400 <br /> DAN KIRK CC y <br /> SHELL OIL CORPORATION <br /> P O BOX 4023 <br /> CONCORD CA 94524 <br /> JAN 0 7 199' <br /> RE: 620 West Charter Way SITE CODE: 1058124 <br /> Stockton, Ca <br /> f <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> has reviewed the Quarterly Status Report for the Fourth Quarter of 1992 and the Status <br /> Report on the Soil Vapor Extraction System from Aegis Environmental dated December <br /> 8, 1992 and December 23, 1992 and has,the following comments. <br /> Monitoring wells #4 and #7 were not sampled during this last quarter of monitoring at <br /> the site. A reduction in the frequency of sampling of some of the wells at this site may <br /> be warranted at this time in order to reduce overall monitoring costs. However, the <br /> decision to reduce the frequency of sampling particular wells should be based on the <br /> information needed to monitor the site. Those.wells that would provide the most <br /> information should be included in a regular monitoring program. <br /> All wells shall be sampled on a yearly basis. At a minimum, all wells shall be monitored <br /> on a quarterly basis for visual and olfactory evidence of contamination, depth to water <br /> data for information for gradient flow determinations and also to ensure that the well is <br /> still in good repair. <br /> Those wells that are downgradient and/or on the perimeter of the site should be sampled <br /> on a regular basis to verify that no further migration of contaminants is occurring. The <br /> wells that will adequately represent current site conditions should also be sampled on a <br /> regular basis. <br /> i <br /> i <br /> A'Dhision of San Joaquin County Health Care Services <br />