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PUBLIC H5ALTH SERVICTS ) 'P.QU.,N
<br /> SAN JOAQUIN COUNTY
<br /> a
<br /> ENVIRONMENTAL HEALTH DIVISION T.= {
<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 /> PAUL SOWA 1 { Py
<br /> VALLEY WHOLESALE DRUG CO. , INC.
<br /> 1401 FREMONT ST W
<br /> STOCKTON CA 95203 FEB 17 2000
<br /> RE: Valley Wholesale Drug Co., Inc. Site Code: 1782
<br /> 1401 Fremont St W
<br /> Stockton CA 95203
<br /> San Joaquin County Public Health Services, Environmental Health Division
<br /> (PHS/EHD) has reviewed Second quarter 1999 groundwater monitoring report dated
<br /> September 2, 1999 prepared by Wm. J. Hunter & Associates. Analytical results of the
<br /> groundwater sample of Monitoring well #1 (MW-1) were 3,700 parts per billion (ppb)
<br /> (reported as 3.7 parts per million in the quarterly report) of Total Petroleum
<br /> Hydrocarbon as gasoline (TPH-g), and 230 ppb of Benzene, 11 ppb of Toluene, 100
<br /> ppb of Ethyl-Benzene, and 190 ppb of Xylenes (BTEX collectively). Results of MW-2
<br /> were 200 ppb of TPH-g, and 1.3, 8.2, 2.4, and 6.1 ppb of BTEX, respectively.
<br /> Historically, results of all monitor well groundwater samples were not-detect (ND) at
<br /> <5.0 ppb methyl tert-butyl ether (MTBE), Di-isopropyl ether, Ethyl tert-butyl ether,
<br /> and t-Amyl Methyl ether using EPA Method 8260 (October 1997 and April 1998) and
<br /> EPA 8015/8020. Depth to groundwater (DTW) has been consistent with fluctuation
<br /> of less than 0.3 feet in the last two quarters (February to July 1999), and the water level
<br /> has been within the screen section of the MWs. The gradient direction of groundwater
<br /> flow has been consistently north/north-eastward since 1995.
<br /> Three Geoprobe® (GP) borings were advanced and soil/groundwater samples were
<br /> collected and analyzed at the site on August 25, 1998. The analytical findings were
<br /> reported in Interim Report Covering Results of Site Investigation dated September 1998
<br /> prepared by Wm. J. Hunger & Associates. GP-1, GP-2, and GP-3, were advanced to 25
<br /> feet below surface grade (bsg), 26 feet bsg, and 23 feet bsg, respectively. Analytical
<br /> results of the soil sample taken from GP-3 at 17 feet bsg were 217 ppb, 2,360 ppb, 1140
<br /> ppb, 3840 ppb of BTEX, respectively, and 558 ppm of TPH-g. Analytical results of the
<br /> soil samples of all 3 borings taken at 23 feet bsg were ND at <3 ppb of BTEX and
<br /> <1ppm of TPH-g. Analytical results of the grab groundwater sample collected from
<br /> GP3 were 0.3 ppb, 0.7 ppb, 0.6 ppb and 0.8 ppb of BTEX, respectively, and 37 ppb of
<br /> MTBE (but was not confirmed with EPA 8260). Results of the grab water sample
<br /> from GP-2 were 1.0 ppb, 4.0 ppb, 3.0 ppb, and 5.0 ppb of BTEX, respectively, and 437
<br /> A Division of San Joaquin County Health Care Services
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