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� LTH DEPARTMENT <br /> ENVIRONMENTAL HEA <br /> pU�N SAN JOAQUIN COUNTY Unit Supervisors <br /> o.° _ Carl Borgrn R.E.H.S. <br /> Donna K.Heran,R-E.H.S. 304 East Weber Avenue, Third Floor Mike Huggins,R.E.H.S.,R.D.I. <br /> e: .< Director <br /> Stockton, California 95202-270 Dflutrta5 W.Wilson,R.E.H.S. <br /> LI 1 Al Olsen,R.E.H-S• Mar aret Lagorio,R.E.H.S. <br /> �. � P• Program Manager Telephone: {209) 468-3420 Robert McClellon,R.E.H.S. <br /> Laurie A.Cotuila,R.E H S Fax: (209) 464-0138 Mark Barcellos,R.E.H.S. <br /> Program Manager <br /> ENTERPRISE INVESTMENTS ,JUN 2 2 2404 <br /> C/O MONTY AND LAURA WARREN <br /> 1052 AMELIA DRIVE <br /> LONG BEACH CA 90807 <br /> SITE CODE 711 <br /> RE: Enterprise Investments <br /> 355 Enterprise Place <br /> Tracy, CA 95376 <br /> sure <br /> San Joaquin County Environmental Health DepartmentAdvanced GeoEnvironmentahas reviewed 1p Inc <br /> Summary Report, dated January 27, 2004,preparedby <br /> (AGE) on your behalf for the above-referenced site. In this report, AGE describes the <br /> history of the subsurface investigation of the unauthorized underground storage tank <br /> (UST) system release, property use, a water well receptor survey, and the physical and <br /> chemical characteristics of the subsurface.- Briefly summarized, the findings and <br /> interpretations of AGE include: <br /> The unauthorized release of fuel hydrocarbons was apparently from a single <br /> 10,000-gallon diesel UST removed in 1997; <br /> • The former UST facility is within 2,000 feet of four domestic wells and i0 <br /> groundwater monitoring wells; <br /> • Depths to water, based on seven groundwater monitoring events, have been <br /> the inferred <br /> ace <br /> approximately w direction feet to s toward h.55 feet eloorthlnorthwestd at(gradients between <br /> groundwater flaw d <br /> 0.002 and 0.0006; <br /> The major contaminant of concern at this facility is diesel; the highest soil <br /> concentrations of diesel, outside the farmer UST location, were found at 3,400 <br /> milligrams per kilogram (mg/kg) in soil boring P4 at 10 feet bsg, and 3,800 mg/kg <br /> in monitoring well MW-5 at 10 feet bsg; (P4 and MW-5 are located southwest of <br /> the former UST.) <br /> The dissolved TPH-gasoline concentrations decreased from as high as 380 <br /> micrograms per liter (}rg/L) to non-detectable in monitoring wells MW-1, MW-2, <br /> MW-4, MW-5, and extraction well EW-1, between February 2002 and August <br /> 2003; <br /> Dissolved TPH-diesel was detected in only onneelE2002 until March 2003E <br /> 2800 µg/L, 800 µg/L, and 920 }Ag/L from August <br />