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PUBLICH" EALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer .. p <br /> 445 N. San Joaquin Street • P.O. Box 388 • Stockton, CA 95201-0388 <br /> (209) 468-3420 <br /> JOHN AND MARGARET MARCI <br /> MARCIS DIESEL SERVICE <br /> 2973 LOOMIS ROAD <br /> STOCKTON CA 95205 <br /> FEB d 3 1G� <br /> RE: 2969 Loomis Road SITE CODE: 2015 <br /> Stockton, Ca <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has recently <br /> completed a review of the file and has the following comments for your consideration. <br /> The two soil samples collected in March of 1988 from the former tank pit area at a depth of <br /> approximately 29 feet below grade showed contamination. <br /> The soil samples collected from monitoring well MW#1, located approximately 5 feet to the northwest <br /> of the former tank pit, also showed contamination from 36 feet to 78 feet below ground surface. <br /> The soil sample results from these two areas do not fully define the area of impacted soil. Additional <br /> soil borings need to be installed to fully delineate the distribution and concentration of contaminants <br /> within the soils at this site. <br /> Monitoring well MW#1 shows intermittent groundwater contamination as benzene and total petroleum <br /> hydrocarbons as diesel. The soil contamination at the site may act as a continuing source of <br /> contamination to the groundwater. Therefore, the levels of soil contamination may need to be <br /> mitigated to abate the current intermittent groundwater contamination and to prevent additional future <br /> contamination. <br /> There are few alternatives available to remediate diesel contaminated soil and groundwater. <br /> Nevertheless, feasibility studies on at least two active remedial alternatives must be conducted <br /> concurrently with the soil assessment. The alternatives being evaluated must be capable of achieving <br /> cleanup levels that will restore the groundwater to background levels. The two alternatives must be <br /> evaluated specifically for the site and compared for effectiveness, length of remediation time, overall <br /> cost and feasibility. <br /> Some remedial alternatives that you may want to consider for this site are excavation, bioventing, and <br /> passive bioremediation. Excavation and bioventing are both active remedial alternatives. Passive <br /> bioremediation is not an active remedial alternative but can be evaluated along with the two active <br /> alternatives. <br /> Because of the depth of the contamination, excavation alone may not be a feasible alternative for this <br /> site. The use of this alternative with other types of alternatives may be feasible and should be <br /> considered, however. <br /> A Division of San Joaquin County Health Care Services <br />