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PUBLIC`"HEALTH SERVICES <br />SAN JOAQUIN COUNTY <br />ENVIRONMENTAL HEALTH DIVISION <br />Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br />445 N. San Joaquin Street • P.O. Box 388 + Stockton, CA 95201-0388 <br />(209) 468-3420 <br />ZONA CORRIGAN <br />2336 WEST ALPINE <br />STOCKTON CA 95204 <br />WAY 101994 <br />RE: 620 SAN JUAN SITE CODE: 2001 <br />STOCKTON CA <br />The data submitted in the "Soil Excavation Report", dated January 21, 1994, and the "Soil Excavation <br />Report Addendum", dated April 1, 1994, both submitted by RESNA Industries, has recently been reviewed <br />for site closure by the San Joaquin County Public Health Services, Environmental Health Division <br />(PHS/EHD) Technical Review Committee (TRC). <br />The uncertainty of the extent of contamination remaining underneath the building at the site was the issue <br />of discussion at the TRC meeting. Based on the extent of the impacted soil that was removed upgradient <br />(or against the groundwater flow path) of the former tank pits, it was concluded that the extent of <br />impacted soil remaining underneath the building downgradient (or with the groundwater flow path) of the <br />former tank pits may be significantly greater than estimated in the report. <br />As the downgradient monitoring well, monitoring well MW#1, did not show contamination at the time it <br />was installed, it may be assumed that the remaining soil plume is limited to the area between the edge of <br />the building and this well. Using this area to establish the full extent of soil contamination remaining will <br />result in a highly conservative estimate. However, without additional costly physical data, a more <br />representative estimate cannot be accurately determined. <br />Please provide a revised estimate of the volume of hydrocarbons remaining beneath the building. Also, <br />please provide an estimate as to the rate of groundwater plume migration (based on the calculated <br />potential groundwater concentrations) and the expected rate and magnitude of natural adsorbtion and <br />degradation over time. This information will be helpful to PHS/EHD in determining the future effects of <br />the residual hydrocarbons to groundwater quality. <br />If you have any questions or wish to discuss this letter in more detail, please contact me at (209) 468-3441. <br />Donna Heran, REHS, Director <br />Environmental Health Division <br />Linda Turkatte, Senior REHS <br />Site Mitigation Unit <br />r - <br />I n i on, REHS <br />Supervisor <br />LT <br />c: CVRWQCB-Beth Thayer <br />c: John Cyr Realtors -Lee Helms c: RESNA-John Lane <br />A Division of San Joaquin County Health Care Services <br />