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PUBLIC liEALTH SERVtES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officerq.. <br /> 445 N. San Joaquin Street • P.O. Box 388 • Stockton, CA 95201-0388 ��Foa <br /> (209) 468-3420 <br /> D <br /> RUSSELL CHAPIN (Cooly <br /> CHAPIN BROTHERS INC <br /> 1203 N CARLTON AVENUE SEP 15 1994 <br /> STOCKTON CA 95203 <br /> RE: Chapin Brothers, Inc. SITE CODE: 1190 <br /> 1766 Monte Diablo <br /> Stockton CA 95203 <br /> San Joaquin County Public Health Services, Environmental Health Division(PHS/EHD) is the lead agency <br /> providing the oversight of the investigation and cleanup of releases from underground storage tanks <br /> within San Joaquin County. PHSiEHD has a contract with California State Water Resources Control <br /> Board to conduct an underground storage tank corrective action program. Section 25297.1 (b) Chapter <br /> 6.7 of the Health and Safety Code provides PHS/EHD the authority to require an investigation and <br /> cleanup of unauthorized releases. The above referenced site was placed in the PHS/EHD Local <br /> Oversight Program (LOP) in August 1991. <br /> PHS/EHD has completed review of the Problem Assessment Report (PAR) prepared by Seacor for the <br /> above referenced site and has the following comments. <br /> The vapor extraction pilot test performed by Seacor was inconclusive. Even though a vacuum was <br /> measured in the temporary wells monitored, more testing is recommended to determine soil permeability <br /> and radius of influence between extraction wells to be used. PHS/EHD concurs with Seacor's <br /> recommendation to perform additional vapor extraction and air sparging tests. <br /> The results obtained from further tests can be evaluated and utilized in a formal Remedial Feasibility <br /> Study which is currently lacking in Seacor's PAR. The Remedial Feasibility Study shall be incorporated <br /> into your next report a FINAL REMEDIATION PROPOSAL (FRP). <br /> In addition, the "Regional Board Staff Recommendations For Initial Evaluation and Investigation of <br /> Underground Tanks" including "Appendices A and B" reporting format and the LUFT Manual shall be <br /> utilized as guidance documents in preparation of work plans and reports. <br /> If you have any further questions regarding this matter, contact Harlin Knoll, Senior REHS, at (209) <br /> 468-3442. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Harlin Knoll, Senior REHS Diane M. Hinson, REHS <br /> Site Mitigation Unit Supervisor <br /> HK <br /> cc: CVRWQCB, Elizabeth Thayer <br /> A 1�i%ilion of San Joaquin County Health Care Services <br />