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PUBLIC, .HEALTH SEkVICES O.P4u•�N'•.0 <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION a. <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 �1Fo"a <br /> 209/468-3420 <br /> HENRY CECCHINI C (0 r,, <br /> CECCHINI CECCHINI & GIOVANNONI <br /> 3000 E EIGHTEENTH ST WED JUN 2 21995 <br /> ANTIOCH CA 94509 <br /> RE: DELTA TRUCK (former) SITE CODE: 1800 <br /> 3535 East Cherokee Road <br /> Stockton, CA 95205 <br /> PHS-EHD has received and reviewed the "mini-workplan" for the proposed destruction of monitoring well <br /> "UST-1". <br /> Historical evidence from this site has indicated that free product was detected in UST-1 in August 1992 when the <br /> depth to water was 94.46 feet below ground surface. By December 1992, the depth to water had risen above the <br /> top of the well casing screened interval and has consistently remained over the top of the screen ever since. <br /> PHS-EHD was concerned that the floating constituents of the petroleum were not being allowed to enter the well <br /> casing and on April 19, 1993 approved an interim remedial action of purging 55 gallons of water from UST-1 on <br /> a weekly basis. As a result, concentrations of petroleum constituents from UST-1 have consistently decreased. <br /> Currently, UST-1 is in the center of the suspected plume of contaminated groundwater and PHS-EHD is not in <br /> favor of destroying this monitoring well. PHS-EHD recommends instead that an aggressive pump test be <br /> performed on this well. By extracting large amounts of groundwater from varying depths within the well casing, <br /> a determination may be made as to the effectiveness of this method as afull remediation process in the future. <br /> Recently three new monitoring wells have been placed around the site and as of the date of this letter, no report <br /> of the installation and sampling has been received. The laboratory data contained within this report will help to <br /> evaluate the status of your site. Please include copies of the weekly purging activities in your next quarterly <br /> report. <br /> Until further data is received and evaluated, your request to destroy UST-1 is denied. Questions regarding this <br /> decision may be directed to Michael Infurna at (209) 468-3454. <br /> Donna Heran, REHS, Director <br /> - <br /> E ental Health Division <br /> Michael Infurna, Senior REHS Diane M. Hinson, RENS <br /> Site Mitigation Unit Supervisor <br /> MI <br /> c: ESE - David Blunt, RG <br /> A Division of San Joaquin County Health Care Services <br />