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PUBLIC HEALTH SERVICES ,oP4U%N <br /> SAN JOAQUIN COUNTY =` : <br /> JOGI KHANNA M.D.,M.P.H. <br /> Health Officer <br /> P.O. Box 2009 • (1601 Fast Hazelton Avenue) •Stockton, California 95201 oq�i kcaN�r <br /> (209)468-3400 F__-)�,� <br /> JAMES GIOTTONINI <br /> PUBLIC WORKS DIRECTOR <br /> CITY OF STOCKTON <br /> 425 NORTH ELDORADO FES? 0 2 199:1 <br /> STOCKTON CA 95202 <br /> RE: FONTANA DRIVE AT SMITH CANAL SITE CODE: 1102 <br /> STOCKTON CA <br /> San Joaquin County Public Health Services, Environmental Health Division has completed the review of <br /> the quarterly report for the fourth quarter of 1992 and has the following comments. <br /> Based on the latest groundwater data obtained from the site, a reduction in the sampling frequency to <br /> yearly for all four wells at the site is not warranted at this time. <br /> The current increase in the water table of appro)dmately 0.32 feet and the detection of 66 parts per billion <br /> of total petroleum hydrocarbons as diesel in monitoring well #3 indicate the need for a sampling program <br /> more frequent than yearly at this time. <br /> Free product should continue to be bailed from monitoring well #4 on a regular basis. The two general <br /> down gradient wells #2 and #3 should continue to be sampled on a quarterly basis to monitor any <br /> changes in the concentrations of contaminants in the groundwater and to effectively monitor any migration <br /> of the contaminant plume. The upgradient well #1 can be sampled on a semi-annual basis at this time. <br /> At least one of the sampling events for this well should occur when the water table would be at it's highest <br /> level, usually in the spring. <br /> Future changes in the sampling frequency should be based on the historical data generated from the site <br /> and on environmental factors which may be specifically influencing this site, such as fluctuations in the <br /> water table, changes in the contaminants' distribution in the groundwater or changes in the groundwater <br /> flow patterns. <br /> If you have any questions, please contact Linda Turkatte, REHS, of my staff at (209) 468-0339. <br /> JogiKhanna M.P.H. <br /> Health O <br /> v to <br /> tie A S, Program Manager <br /> nvironmental Health Division <br /> LAC/lt <br /> c: CVRWQCB-Beth Thayer c: COS City Manager-Duane Milnes <br /> c: COS Public Works-Jim Escobar c: COS Public Works-Stephen Chen <br /> c: COS Public Works-Sara Cortes c: RESNA Escalon-John Lane <br /> A Division of San Joaquin Counry Health rare Scmca �� <br />