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ENVIRONMENTAL HEALTH DEPARTMENT <br /> °PCU c <br /> �?• 1 a Donna K Heran,R E H S SAN JOAQUIN COUNTYUnit Supervisors <br /> t Dzrector <br /> 304 East Weber Avenue, Third Floor Carl Borgman,R E H s <br /> Al Olsen,R E H S Stockton, California 95202.-2708 Mike Huggins,R l , s ,R fl I <br /> • r �P • Pro ram Manager Douglas W Wilson,R E H S <br /> QC/r0 g g Telephone (209) 468-3420 Margaret Lagorio,R E H S <br /> Laurie A Cotulla,R E H S <br /> Program Manager Fax (209) 464-0138 Robert McClellon,R E H S <br /> Mark Barcellos,R E H S <br /> BOB YAMADA APR 15 2004 <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 /> On April 15, 2004 monitoring well i1IW-4 was installed at the above-referenced site as <br /> proposed in the Monitonng Wlelllnitallation Work Plan dated February 9, 2004 prepared by <br /> Advanced GeoEnvironmental, Inc (AGE) and approved by San Joaquin County <br /> Environmental Health Department (EHD) Odor of petroleum hydrocarbons was detected <br /> in the soil samples collected from the Nf\V-4 boring below the groundwater table AGE <br /> staff also recorded the presence of hydrocarbons at a concentration of 45 parts per million <br /> (ppm) using the field organic vapor detector (Photo Ionization Detector) NIW-4 is located <br /> about 40 feet southwest (a downgradient direction) of the former underground storage tanks <br /> (UST) An inactive domestic well is located about 200 feet southwest of the UST, and a <br /> domestic well (DW-1) is located about 240 feet southwest of the UST <br /> IDue to the proximity of the domestic wells to the former UST, the presence of <br /> contamination found m MW-4 soil samples, and the lughly mobile nature of the <br /> I contaminant methyl tert butyl ether (MTBE) which has been repeatedly detected in the <br /> groundwater at this site, EHD directs an additional monitoring well be placed between MW- <br /> 4 and the domestic well EHD also directs you to include sampling of the domestic well in <br /> Iall future quarterly sampling effective immediately <br /> If you have any questions, please feel free to contact Jeffrey Wong at (209) 468-0335 <br />' Donna Heran, REHS, Director <br /> Environmental Health Department <br /> 4 <br /> Je frey Wong , Seruor()REHS ` Margaret Lagorio, REHS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> I c RWQCB,Central Valley Region—James L L Barton, RG <br /> c Advanced GeoEnvironmental, Inc — Eyrene L Fisher <br /> I <br />