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California Regional Water Quality 6.6ntrol Board , T. <br /> Central Valley Region % <br /> Robert Schneider,Chair <br /> Winston H.Hickox Gray Davis <br /> Secretary for Sacramento Main Office Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/—rwgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> "1 <br /> 12 March 2001 <br /> Vickie Mello <br /> Marion Gonzalez <br /> 222 East Webber Avenue t <br /> Stockton, California 95202 <br /> REVIEW SUBSURFACE INVESTIGATION REPORT <br /> TONY GONZALEZ TRUCKING, 1855 JACKSON STREET, ESCALON, SAN JOA QUIN COUNTY <br /> Board staff reviewed the 16 February 2001 Subsurface Investigation Report (Investigation Report) <br /> submitted by Ground Zero Analysis, Incorporated (Ground Zero) for the Tony Gonzalez Trucking <br /> site. As requested by Ground Zero, and approved by Board staff, the report of findings was to be <br /> submitted to this office by 5 January 2001. The Investigation Report was submitted 42 days late. <br /> Failure to comply with our future directives will result in formal enforcement actions, and may <br /> jeopardize you eligibility for the UST Cleanup Fund. <br /> As presented in the Investigation Report, Ground Zero completed four soil borings in <br /> November 2000 to a maximum depth of 60 feet and collected soil and groundwater samples for <br /> analysis. Soil samples identified total petroleum hydrocarbons as gasoline (TPHg), benzene, <br /> toluene, ethyl benzene, and xylenes (BTEX) from 15 feet to 40 feet below the former 1,000-gallon <br /> gasoline underground storage tank (UST). Maximum concentrations in soil show TPHg at <br /> 31,000 milligrams per kilogram (mg/kg),benzene at 70 mg/kg, and total lead at 38 mg/kg. Minor <br /> concentrations of toluene were identified from 40 to 60 feet where first groundwater was <br /> encountered. <br /> Two groundwater grab samples were collected from 60 to 64 feet in two of the four soil borings. <br /> Petroleum hydrocarbons and fuel oxygenates/fuel additives were not identified in groundwater; <br /> however, the results of total lead analyses showed a maximum concentration of 129 micrograms <br /> per liter (µg/l) from an unfiltered sample. The Primary Maximum Contaminant Level for lead is <br /> 15 µg/1, and additional work will be required to address this issue. Board staff suggest that you <br /> complete one of the following: <br /> • Collect and filter an additional groundwater sample below the contaminated area to <br /> determine the soluble lead in groundwater. <br /> • Collect additional soil samples within the contaminated area and analyze for soluble lead by <br /> waste extraction testing methods. <br /> • Submit documentation of naturally occurring lead concentrations found in the Escalon area. <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br /> The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. For a list of simple <br /> ways you can reduce demand and cut your energy costs,see our Web-site at http://www.swrcb.ca.gov/rwgcb5 <br />