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PUBLIC 11EALTH SERVES <br />SAN JOAQUIN COUNTY <br />ENVIRONMENTAL HEALTH DIVISION <br />Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br />304 E. Weber Ave., Third Floor • P. 0. Box 388 • Stockton, CA 5'20 <br />209/468-3420 <br />MAILED MAR 0 4 1996 <br />DONNA SANTINI GARDNER <br />1206 STRUCK <br />ORANGE CA 92667 <br />RE: Donna Gardner Property Site Code: 1864 <br />26056 Thornton Road <br />Thornton CA 95686 <br />San Joaquin County Public Health Services, Environmental Health <br />Division (PHS/EHD) has reviewed the "Groundwater Monitoring <br />Report, July through September 1995" dated January 3, 1996, the <br />"Work Plan for Further Delineation of Subsurface Petroleum <br />Hydrocarbons Contamination" dated January.4, 1996, and the <br />"Groundwater Monitoring Report, October through December 1995" <br />dated February 13, 1996; all of which were prepared by Smith <br />Environmental. PHS/EHD has the following comments for your <br />consideration. <br />PHS/EHD concurs with the necessity to further investigate the <br />extent of residual soil contamination. Six soil borings are <br />proposed using direct push methodology, with a maximum of two <br />soil samples submitted for analysis from each boring. PHS/EHD <br />recommends that two additional soil borings be drilled in the <br />area between excavation sample, EW2 and MW1 and in the area west <br />of MW3. Furthermore, the proposed borings should be drilled to a <br />sufficient depth and sufficient soil samples submitted for <br />laboratory analysis to determine the horizontal and vertical <br />extent of residual soil contamination. <br />At this particular site, depth to water levels fluxuate <br />significantly from quarter to quarter. In order to evaluate <br />affects that depth to water measurements may have on <br />concentrations of petroleum hydrocarbons, the groundwater <br />monitoring data should be tabulated with laboratory analysis <br />results. <br />Please note that the Thornton Municipal Supply Well #2 is located <br />within 40 feet of the most contaminated monitoring well, MW4. As <br />PHS/EHD has requested in the past, during the next quarterly <br />monitoring and sampling event, the supply well should be sampled <br />for petroleum hydrocarbon constituents. Please discuss <br />scheduling a sampling appointment with the Utilities Maintenance <br />District. <br />A Division of San Joaquin County Health Care Services