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PUBLIC hEALTH SERV TOES <br /> PQ_U I ly <br /> SAN JOAQUIN COUNTY <br /> r.' <br /> ENVIRONMENTAL HEALTH DIVISION , ' sX <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 E. Weber Ave., Third Floor • P. O. Box 388 • Stockton, CA 95201-0388_ °"'6 Foaa`" <br /> 209/468-3420C LwJ \�f <br /> CARL AND MURIEL YEARING <br /> 1062 RODEO ROAD MAILED FEB 0 61996 <br /> PEBBLE BEACH CA 93953 <br /> RE: 521 NORTH CHEROKEE SITE CODE: 1324 <br /> LODI CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS- <br /> EHD) is sending this letter in response to a facsimile from Cris Hamilton to PHS-EHD <br /> dated January 30, 1996 and to a telephone conversation between PHS-EHD and <br /> Dana Booth on the same date. Several issues were presented in the letter and <br /> discussed during the telephone conversation. The intent of this letter is to clarify and <br /> provide guidance on the purpose and ultimate goal of the investigation and cleanup <br /> required at this site. <br /> The recent guidance from the California State Water Resources Control Board to <br /> agencies overseeing the investigation and cleanup of underground storage tank sites <br /> primarily dealt with low risk soil sites. Some guidance was also provided for low risk <br /> groundwater contaminated sites. Please be advised that this site is not considered a <br /> low risk groundwater site for the following reasons. <br /> The Lodi area relies on groundwater for municipal, domestic and agricultural supply. <br /> Cleanup of contaminated sites must at least be protective, now and in the future, of <br /> these uses. The soils in and around the Lodi area are known to be highly permeable <br /> and conducive to the movement of contamination. The soil and groundwater at this <br /> site is impacted with substantial concentrations of petroleum hydrocarbons. This <br /> "source" of hydrocarbons is contributing and, unless abated, will continue to <br /> contribute to the already existing groundwater contaminant plume. The full extent <br /> and ultimate fate of the groundwater plume is completely unknown at this time. Until <br /> such a time that the "source" is abated, the stability and ultimate fate of the <br /> groundwater plume at the site cannot be determined with any reasonable certainty. <br /> Natural attenuation and biodegradation technologies are most effective where an <br /> active "source" has been removed. <br /> Based on the above discussion, source reduction at this site is warranted and <br /> required. The goal of source reduction at this site is to abate the contamination <br /> sufficiently so that any residual contamination left behind will be able to degrade <br /> sufficiently over time to levels that are protective of beneficial uses. The <br /> A Division of San Joaquin Countv Health Care Services <br />