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PUBLIC hEALTH SERVTCES <br /> SAN JOAQUIN COUNTY ° 'cow <br /> 2.. <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 E. Weber Ave., Third Floor • P. O. Box 388 • Stockton, CA 95201-0388 <br /> 209/468-3420 <br /> CC <br /> ALF <br /> DALE STEELE MAILED JAN 2 4 1996 <br /> CALTRANS <br /> PO BOX 2048 <br /> STOCKTON CA 95201 <br /> Re: Stockton Yard Site Code: 10193 <br /> 1604 South "B" Street <br /> Stockton CA 95205 <br /> San Joaquin County, Public Health Services, Environmental Health Division (PHS/EHD) has <br /> completed review of Geocon's "Site Assessment Workplan" dated January 8, 1996. PHS/EHD has <br /> the following comments for your consideration. <br /> PHS/EHD issued permit #008344 to drill and sample 5 soil borings, 4 of which to be converted into <br /> monitoring wells and 1 to be converted into a vapor extraction well. As PHS/EHD has stated and <br /> will once again reiterate, vapor extraction wells with excessive screen lengths have decreased <br /> operational efficiencies. To complete the boring dually, with a 2" monitoring well and 2" vapor <br /> extraction well, is an alterative which PHS/EHD recommends. <br /> Sufficient soil samples should be collected to determine the lateral and vertical extent of the soil <br /> contamination plume. Also note that the work plan proposed to further characterize the lateral <br /> extent of the groundwater contamination plume without addressing the vertical extent of <br /> groundwater contamination. With the concentration levels which have been evidenced, it is likely <br /> that in order to characterize the extent of groundwater contamination that at least one vertically <br /> discrete monitoring well will be necessary. <br /> The scope of laboratory analysis proposed included testing for TPH-gas, TPH-diesel, and BTEX. In <br /> addition to these analyses, please test for Methyl-tert-butyl ether (MTBE) utilizing EPA method 8020 <br /> with EPA method 8260 for confirmation. <br /> As a part of the reporting of the proposed field activities, please include an inventory of stored and <br /> already disposed soil cuttings and purge/development water. <br /> Please note that PHS/EHD must be contacted prior to any site activity. If you have any questions, <br /> please contact Mary Meays at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> �Environmental Health Division i <br /> Mary Meays, Senior REHS Diane M. Hinson, REHS <br /> Site Mitigation Unit Supervisor <br /> MM/1604B <br /> cc: Elizabeth Thayer, CVRWQCB <br /> cc: Saiyed Ali, CalTrans <br /> cc: Rick Walls, Geoc� <br /> A Division of San Joaquin County Health Care Services <br />