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4 � <br /> PUBLIC HtALTH SI L E N <br /> SAN JOAQUIN COUNTY "a <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> LIAR 0 6 2001 <br /> BOB YAMADA <br /> 15406 S TRACY BLVD <br /> STOCKTON CA 95206 <br /> RE: YAMADA BROTHERS SITE CODE: 4067 <br /> 15406 S TRACY BLVD <br /> STOCKTON CA 95206 <br /> San Joaquin County Public Health Services,Environmental Health Division(PHS/EHD) has <br /> reviewed Qurtedy Report- Third Quarter 2000 dated December 8,2000 prepared by Advanced <br /> GeoEnvironmental,Inc. (AGE). Analytical results of the ground water sample from Monitoring <br /> Well#3 (MW-3) were 120 micrograms per liter(µg/L) of methyl tent-butyl ether(MTBE). MTBE <br /> was not detected in MW 1,MW-2,and the domestic well. Total petroleum hydrocarbon as gasoline <br /> (IPH G) and as diesel(IPH D),aromatic hydrocarbons as benzene,toluene,ethyl-benzene,and <br /> xylenes (BTEXO were not analyzed.Measured depth to ground water indicates an increase of <br /> approximately half to one foot since the last quarterly sampling in November 1999. Depth to water <br /> in MW-3 was 4.27 feet below surface grade (bsg). <br /> Previous analytical results of the MW-3 sample collected in November 1999 were 17 µg/L for <br /> MTBE. Quarterly sampling was not conducted between November 1999 and September 2000. In a <br /> telephone conversation on March 5,2001,AGE informed PHS/EHD that the analytical results of <br /> the latest sampling in December 2000 were 2.7 �tg/L of MTBE at MW-1, 1.4 �tg/L of MTBE at <br /> MW-2,and 63 ug/L of MTBE at MW-3. The report of that quarterly sampling has not been <br /> released yet. Submit this report to PHS/EHD no later than March 20,2001. <br /> California Department of Health Services has established the Primary Maximum Contaminant Levels <br /> (MCL) for MTBE in drinking water at 13 µg/L. The recurrent detection of MTBE in MW 3 <br /> warrants another groundwater monitoring event. Additional work to delineate the extent of the <br /> MTBE groundwater plume and to calculate to total mass of MTBE and any other contaminants will <br /> be required. Effort to identify potential existing releasing sources (such as the above ground tanks <br /> northwest of the monitoring wells) may be needed. <br /> If you have any questions,please feel free to contact Jeffrey Wong at (209) 468-0335. <br /> Donna Heran,RENS,Director <br /> Environmental Health Division <br /> Jeffrey Wong, REI-IS Dot Lofstrom,RG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> c: RWQCB,Central Valley Region-Marty Hartzell <br /> c. Advanced GeoEnvironmental-Paul Dotsun <br /> A Division of San Joaquin County Health Care Services <br />