SITE INFORMATION AND CORRESPONDENCE (2)

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PUBLIC HEALTH SERVICES �o SAN JOAQUIN COUNTY ` ENVIRONMENTAL HEALTH DIVISION Karen Furst, M.D., M.P.H., Health Officer .. ; 304 East Weber Avenue, Third Floor• Stockton, CA 95202 209/468-3420 FILE GOP Y DURHIM SALEH ALI 23569 S SANTA EE RD JUL 2 21998 RIVERBANK CA 95367 RE: Ranch Market Site Code: 2412 23569 S. Santa Fe Road Riverbank, CA., 95367 San Joaquin County Public Health Services, Environmental Health Division (PHS-EHD) has reviewed the June 1998 "Workplan" as submitted by Arrowhead Consulting on June 23, 1998 and has the following comments. Since an elevated level of MTBE was detected in the groundwater at the former underground storage tank (UST) location and none was detected in the soil, PHS-EHD will require additional MTBE soil analyses to determine the source of this contaminant. Monitoring wells proposed in this workplan are to have a soil sample analyzed for MTBE by Method 8020. If MTBE is detected in any 8020 scan then that soil sample is to be analyzed for MTBE by EPA Method 8260 to verify its presence. In reviewing the data for this site, it has been noted that previously submitted soil results have been recorded in multiple units of measurement. In order to avoid confusion in the future, please report all soil results in "mg/kg" (ppm). Please continue to report all groundwater results in "ug/1" (ppb). With the above noted changes incorporated in the field work, the plan is approved. The boring permit application and the application $89 fee that was required to be submitted with the workplan has not been received at PHS-EHD. You are hereby directed to submit these required items along with an updated site specific safety plan by August 7, 1998. The drilling and installation of the monitoring wells is to completed by August 28, 1998. The report of findings is to be submitted to PHS-EHD by October 2, 1998. A Division of San Joaquin Counry Healrh Care Services