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%..O <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> PQu�k SAN JOAQUIN COUNTY <br /> .. Donna K.Heran,R.E.H.S_ Unit Supervisors <br /> Director 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.E.H.S.,R.D.I. <br /> • cQ.. - .��P • Program Manager Telephone. 209 Douglas W. Wilson,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. h ) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Fax: (209) 464-0138 <br /> Program Manager Robert McClellan,R.E.H.S.Mark Barcellos,R.E.H.S. <br /> BOB YAMAHA <br /> 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 MW-4 was installed at the above-referenced site as <br /> proposed in the Monitoring Wlell.Installation Wlork 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 MW-4 horing 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). MW-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 /> Due to the proximity of the domestic wells to the former UST, the presence of <br /> contamination found in MW-4 soil samples, and the highly mobile nature of the <br /> contaminant methyl tent butyl ether (NITBE) 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 /> all 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 /> Je frey Wang, Senior REHS Margaret Lagorio,REHS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> c: RWQCB, Central Valley Region—James L. L. Barton, RG <br /> c: Advanced GeoEnvironmental, Inc. -- Eyrene L. Fisher <br />