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PUBLIC "HEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> •y <br /> ENVIRONMENTAL HEALTH DIVISION ,�� . � .:A <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 95201-0388 <br /> 209/468-3420 <br /> 0 <br /> RICHARD HENDRIX C ( ly <br /> HENDRIX AND SONS TRUCKING <br /> 3730 MUNFORD AVENUE <br /> STOCKTON CA 95205 MAILED AUG 2 91995 <br /> RE: 3730 MUNFORD AVENUE SITE CODE: 1694 <br /> STOCKTON CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> has completed the review of the "Site Status Report" dated June 19, 1995, submitted by <br /> SMITH Environmental, and has the following comments for your consideration. <br /> The four monitoring wells at the site, including monitoring well MW#1, did not show <br /> petroleum hydrocarbon impact in this last round of sampling. Please continue to sample <br /> the wells at the site on a quarterly basis at this time as the data will be needed for the <br /> closure evaluation process. <br /> In order to be considered for site closure and to complement the data being collected <br /> from the monitoring wells, the degree of residual soil contamination remaining at the site <br /> must be compiled at this time. The full extent of the remaining soil contamination must <br /> be evaluated and presented in cross sections of the site. If additional soil borings are <br /> needed to accomplish this task, they should be installed now. In addition to analyzing <br /> for hydrocarbon constituents, tests for model input parameters (i.e. porosity, organic <br /> carbon, and hydraulic conductivity) and hydrocarbon consuming bacteria should also be <br /> utilized. <br /> From this information the total remaining mass volume of contamination must be <br /> calculated and evaluated for future threat to groundwater. Soil and groundwater fate and <br /> transport modeling may be needed to evaluate and predict any potential future impacts <br /> to groundwater and the long term fate of the contaminants in the subsurface. <br /> Based on the outcome of the fate and transport predictions, it can be determined if the <br /> residual soil contamination can be left in place without further mitigation or whether <br /> additional remediation is needed. A closure or no further action may be justified if the <br /> evaluation indicates background levels will ultimately be achieved over time by natural <br /> processes. <br /> A Division of San Joaquin County Health Care Services <br />