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PUBLIC HEALTH SERTICES �0P �o <br /> SAN JOAQUIN COUNTY r. <br /> W :< <br /> JOGI KHANNA M.D.,M.P.H. <br /> Health Officer p <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) • Stockton,California 95201 <br /> (209) 468-3400 <br /> 17 <br /> cc- <br /> SCOTT HOOTON <br /> 164W SOUTHCENTER PKWY APR p 21993 <br /> TUKWILA WA 98188 <br /> RE: BP OIL FACILITY #11195 SITE CODE. 1554 <br /> 16500 S I-5 <br /> LATHROPCA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has reviewed the <br /> "Preliminary Site Assessment Report" dated February 16, 1993 submitted by RESNA Industries, Inc. and <br /> has the following comments. <br /> A survey of wells within 2,000 feet of the site shall be initiated and included in your next report. This will <br /> identify any gradient influences and any direction of contaminant migration. <br /> The sail and groundwater contamination shall be physically defined in order to design a proper <br /> remediation plan. This further definition should be accomplished by installing additional monitoring wells. <br /> Placement of these monitoring wells should be based on information obtained from additional water level <br /> measurements and gradient determination. In addition the existing monitoring wells should be sampled to <br /> confirm the results from the December 21, 1992 sampling event. <br /> A workplan shall be submitted to PHS/EHD by May 10, 1993 to further define the lateral and vertical <br /> extent of soil and groundwater contamination. <br /> Pursuant to Section 2652(d) of the Underground Storage Tank Regulations (California Code of <br /> Regulations, Title 23, Chapter 16) a quarterly monitoring report shall be submitted to Public Health <br /> Services, Environmental Health Division and Central Valley Regional Water Quality Control Board <br /> (CVRWQCB) until the investigation and cleanup of the site is deemed adequate. The report is to show <br /> the: <br /> -status of investigation and cleanup activities including the results of all investigations <br /> completed to date; <br /> -proposed continuing or next phase of investigation; <br /> -method of cleanup proposed or implemented,schedules for the completion of the <br /> investigation of the site and remediation; <br /> -method and location of disposal of the released hazardous substance and any <br /> contaminated soil, groundwater or surface water; <br /> -manifest required for transport of hazardous substances; <br /> -monitoring well data including groundwater elevation, pH, conductivity, gradient; <br /> -analytical results of groundwater or soil sampling; and <br /> -site map showing the "zero line" of contamination, if known, and changes in the above <br /> measurements over the last quarter. <br /> A Division of San Joaquin County Health tare Services 10 <br />