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' DEPARTMENT
<br /> ENVIRONMENTAL HEALTH
<br /> SAN JOAQU_IN COUNTY iVn is Supervisors
<br /> °o Carl Bbrgman,R.E.H.S.
<br /> Ronna K.Reran,R.E.H.S. 304 East Weber Avenue, Third Floor
<br /> Director Mike Huggins,R.E.H.S.,R.D.I.
<br /> ' Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S.
<br /> • c., �- Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S.
<br /> Q�ikoR`' Laurie A.Cotulla,R.EM.S. Fax: (209) 464-0138 Robert McClellon,R.E.H.S.
<br /> Program Manager Mark Barcellos,R.E.H.S.
<br /> ULTRAMAR INC AUG o 9 2004
<br /> 585 WEST THIRD STREET
<br /> HANDFORD CA 93230
<br /> SAYED & ZAKIA ABDELWAHED
<br /> 740 WEST OAK ST
<br /> STOCKTON CA 95203
<br /> Re: ZE AUTO REPAIR
<br /> 2255 SOUTH AIRPORT_\Vy
<br /> STOCKTON CA 95206
<br /> Four monitoring wells SAV-1 to MtiV-4 were installed at the above-referenced site in July 2003. Samplings of
<br /> the monitoringwells were conducted in July 2003,and March and)unc 2004. San Joaquin Count Groundwater
<br /> nd second uart
<br /> Environmental Health Department(EHD)has received and reviewed the first a ,2 �'
<br /> E F
<br /> I'F Monitoring Reports of 2004,and Result ofAdditional Site In
<br /> dated October 7,2003 prepared by Horizon
<br />` Environmental Inc. (Horizon).
<br /> Analytical results of the groundwater samples from the highest impacted well i\-ff-1 for all three above-
<br />, mentioned sampling events exceeded INlaximum Contaminant Levels for drinking water esrablished by
<br /> California Department of Health Services for benzene,toluene,ethyl-benzene,xylenes,1,2-dicholoroethane
<br /> (1,2-DCA),and 1,2,-dibromoethane(EDB). Analytical results of the groundwater samples from the latest
<br /> sampling quarter�une 2004)were 130,000 micrograms per liter(ug/1)of Total Petroleum Hydrocarbons as
<br /> were 0 ug/1 of ethyl-benzene,12,000
<br /> l of
<br /> gasoline(I"PH-g),12,000 ug/l of benzene,24,000 ug/1 of toluene,2,30
<br /> total xylenes,960 ug/1 of 1,2-DCA and 550 ug/1 of EDB. Results of groundwater samples from;\Its-3 wwe
<br /> 74 ug/1 of TPH g and 19 ug/1 of 1,2-DCA,and from \M,`-4 were 160 ug/1 of TPH-g and'1.6 ug/1 of 1,2-DCA.
<br /> Depth to groundwater was reported as approximateiv 41 feet bsg,and groundwater
<br /> the groundwater direction
<br /> edwat Foflo a last
<br /> l-2003
<br /> contrast to u gr
<br /> two quarters was calculated to be generally eastward,m ] }
<br /> direction was initially calculated as northward.
<br /> The deepest soil samples collected at 55 feet below surface grade (bsg) from 1\,I%V-1 were 340 milligrams per
<br /> kilogram (mg/kg)of TPH-g and 0.46 mg/kg of benzene;=d soil samples collected at 35 feet bsg were 11,000
<br /> mg/kg of TPH-g and 2.6 mg/kg of benzene. Results of soil samples from\Tt�1-2 to I , -4 were all non-detect.
<br /> Analytical results of the soil physical characteristic for the soil sample at 35 feet bsg were 6.71E-7 centimeters
<br /> per sec (cm/sec)in permeability,and for soil samples from below groundwater table at 49 feet bsg and 55 feet
<br /> bsg were 2.35E-7 cm/sec and 535E-7 cm/sec,respectively.
<br /> Additional work is required to characterize.the extent and concentration of the contamination at this site.
<br /> Submit a work plan to EHD that will define the vertical and horizontal extent of the contamination in both soil
<br /> and groundwater by September 20,2004. EHD recommends you also
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