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PUBLICMEALTH SERVICES U� <br /> SAN JOAQUIN COUNTY <br /> r.� <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer •' <br /> 304 E.Weber Ave., 3rd Floor • P. O. Box 388 • Stockton, CA 95201-03 - �P <br /> 209/468-3420 <br /> �Y <br /> JONATHAN MARLOWE <br /> MARLOWE PROPERTIES <br /> PO BOX 150-211 MLED OLT 0 21995 <br /> SAN RAFAEL CA 95915 <br /> Re: Marlowe Property Site Code: 1828 <br /> 4648 Waterloo Road <br /> Stockton CA 95215 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has completed review <br /> of Advanced GeoEnvi ronmentai's"Corrective Action Plan and Quarterly Groundwater Monitoring"report dated <br /> April 28, 1995 and has prepared the following comments for your consideration. <br /> The corrective action plan included general costs associated with various remedial alternatives. However, in <br /> order to determine site specific cost effectiveness, estimates of site specific remedial costs must be included <br /> and discussed. <br /> The corrective action plan indicated that one vapor extraction we]l should be adequate to reach the perimeter <br /> of the hydrocarbon plume and that a thermal oxidation unit should be installed for hydrocarbon destruction <br /> prior to discharge. The plan stated that after several months of operation and influent vapors have decreased <br /> that soil borings would be drilled for quantitative analysis in the laboratory to monitor the vapor extraction <br /> systems effectiveness. Cost of system monitoring should be included with cost estimates. <br /> Since hydrocarbons were generally detected to 45 feet below grade, the depth of the vapor extraction well, <br /> VW1, will be reduced from 72 feet to 47 feet by filling the bottom 25 feet of the well with some material. <br /> Please submit an addendum which summarizes all analytical results obtained during soil and groundwater <br /> sampling and an estimate of the volume of soil contamination which may continue to impact groundwater. <br /> PHS/EHD agrees that soil and groundwater remediation is necessary; however, insufficient feasibility analysis <br /> was included to justify the cost effectiveness of vapor extraction vs,excavation. Also,groundwater remediation <br /> alternative analysis was not included. <br /> If you have any questions or wish to discuss the site further, please contact Mary Meays at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Mary Meays, Senior REHS Diane M. Hinson, REHS <br /> Site Mitigation Unit Supervisor <br /> MM14648.E PA <br /> cc: Elizabeth Thayer, CVRWQCB <br /> cc: George Lockwood, SWRCB <br /> cc: Bob Marty, Advanced GeoEnvironmental <br /> A Division of San Joaquin County Health Care Services <br />