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H2 0GEOL o A GROUND WATER CONSULTANCY Mr. Harlan Knoll, R.E.H.S. Senior Registered Environmental Health Specialist San Joaquin County Environmental Health Department 304 E. Weber Avenue, Third Floor Stockton, CA 95202-2708 10ECENE' DEC 2 2005 ENVIRONMILNT NEAI_:? ii PERMIT/SERVICES November 29, 2005 RE: Work Plan to Further Define the Lateral and Vertical Extent of Contamination and Access the Risk to Thornton Municipal Well No. 2 - Former Donna Gardner Property, 26056/26080 North Thornton Road, Thornton, CA. Dear Mr. Knoll; This Work Plan to Further Define the Lateral and Vertical Extent of Contamination and Access the Risk to Thornton Municipal Well No. 2 is submitted by H20GEOL on behalf of R. B. Construction, Inc. for the former Donna Gardner Property, located at 26056/26080 North Thornton Road in Thornton. The site location is shown on Figure 1. Diagrammatic site area features and former features and the locations of the monitoring wells are shown in Figure 2. The October 17, 2005 San Joaquin County Environmental Health Department work plan request letter directed that quarterly groundwater monitoring resume sampling all monitoring wells and Thornton Municipal Supply Well No. 2. This revised quarterly monitoring program will commence with the First Quarter 2006 groundwater monitoring event. The quarterly groundwater samples, and all samples collected during implementation of this work plan, will be analyzed by U.S. E.P.A. Method 8260B that includes Total Petroleum Hydrocarbons in the gasoline range (TPH-g); the volatile aromatic hydrocarbon compounds (benzene, toluene, ethylbenzene, and total xylene isomers); the fuel oxygenates: tertiary -Butyl alcohol (TBA); Methyl tertiary -butyl ether (MtBE); Di - isopropyl Ether (DIPE); Ethyl tertiary -butyl ether (EtBE); and tertiary -Amyl methyl ether (TAME) and the scavengers ethylene dibromide (EDB) and 1,2-Dichloroethane (DCA). All required information will be uploaded to Geotracker as it becomes available. Specifically, the October 17, 2005 San Joaquin County Environmental Health Department letter indicated that The work proposed should complete the investigation of the lateral and vertical extent of the soil and groundwater contamination so that the mass of contamination remaining can be calculated and evaluated. The work should also include an evaluation for performing groundwater extraction from monitoring wells MW3 and MW4, and address disposal options for any extracted groundwater. P. O. Box 2165 ■ Livermore, California 94551-2165 ■ (925) 373-9211