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PUBLIC HEALTH SERVICES oPQ��N <br /> SAN JOAQUIN COUNTY <br /> JOGI KHANNA M.D.,M.P.H. = ;� <br /> Health Officer P <br /> P.O. Box 2009 9 (1601 East Hazelton Avenue) •Stockton,California 95201 <br /> (209) 468-3400 <br /> JAMES GIO'ITONINI <br /> PUBLIC WORKS DIRECTOR <br /> CITY OF STOCKTON <br /> 425 NORTH ELDORADO STREET `` U, � �;� (� I e <br /> STOCKTON CA 95202 <br /> i <br /> I <br /> RE: City of Stockton Police Facility Site Code: 1178 <br /> 22 East Market <br /> Stockton CA 95202 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has completed j <br /> review of the "Summary Report" dated October 14, 1992 and prepared by RESNA. PHS/EHD has the <br /> following comments for your consideration. <br /> Unfortunately, PHS/EHD cannot recommend the site be closed given the current available information. <br /> The re-excavation attempt that was initiated on July 23, 1992 and ended on July 30, 1992, removed <br /> approximately 305 cubic yards of contaminated soil. The excavation was limited to the north due to the <br /> location of the building and sidewalk. The high voltage concrete encased electrical lines also limited the <br /> extent of contaminated soil which could be removed. Residual soil contamination was documented, up to <br /> 20,000 ppb benzene and 1,900 ppm total petroleum hydrocarbon - gasoline, which poises a threat to ; <br /> groundwater. Additional investigation will be necessary to define the boundaries of the residual soil <br /> contamination. <br /> The results of groundwater monitoring indicate that groundwater has not been impacted to date. The <br /> frequency of groundwater monitoring may be reduced to annual, until further investigation indicates <br /> closure may be considered.. <br /> There is a discrepancy between PHS/EHD field notes made during sampling and Figure 3 of the summary <br /> .report. Please re-evaluate your field notes and prepare a more representative map. Please submit by <br /> January 29,1993 the revised map with the work plan to investigate residual soil contamination. <br /> If you have any questions, please contact Mary Meays, REHS, of my staff at (209) 468-0337. <br /> Jogi Khanna, M. ., M.P.H. <br /> Health Office 1 <br /> J � <br /> �- / <br /> urie A. Cotulla, REHS, Program Manager <br /> Environmental Health Division <br /> LAC/MM:Ib <br /> c: Elizabeth Thayer, CVRWQCB <br /> c: Jim Escobar, COS <br /> c: John Lane, RESNA <br /> A Division of San Joaquin County Health Care Services <br /> i <br /> 1'.r <br />