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MAR-07-0000 04:2G FROM GEOLOGICAL TECHNICS TO • 4640130 P.04 <br /> • <br /> Geofogicd Tm6nics Inc. <br /> 1,41 Stint 9ml <br /> xodaw,cos ma.9S35i <br /> (2097 53Ri41f/�T+rfP53S-%52 <br /> Work Plan Addendum <br /> Additional Site Characterization <br /> George's Service <br /> 1600 Durham Ferry Road <br /> Tracy,California <br /> Project No. 281.2 <br /> January 20- 1997 <br /> 1.0 SITE BACKGROUND <br /> The George's Service site is located at 1600 West Durham Ferry Road were Durham Feng <br /> intersects with Highway 33 in Tracy. George's Service operates an automotive repair facility <br /> and mini market store on this property. <br /> The work plan Geological Technics Inc. submitted on January 29. 1996 gave a brief history <br /> of this site and the work performed. Subsequent to that date groundwater levels have been <br /> measured routinely and in September 1996 a groundwater monitoring event was performed. <br /> A summary groundwater monitoring report was prepared on December 18. 1996. On January <br /> 17, 1997 Del-Tech again performed a groundwater monitoring event and those samples are <br /> currently in the lab being tested. <br /> On January 17, I997 Mary Meays of San Joaquin County inspected the monitoring work and <br /> held a planning meeting with Don Light, Ray Kablanow, and yourselves. This addendum is <br /> in response the her January 9, 1997 letter and the January 17, 1997 meeting. <br /> 2.0 MODIFICATIONS TO THE PROPOSED INVESTIGATION <br /> 2.1 Information Generated for Risk Based Corrective Action Evaluation <br /> These tasks include,but tray not be limited to the following: <br /> • Perform a well survey to locate domestic wells within a 2000 foot radius and review the <br /> site and adjacent properties for potential human and environmental receptors that may be <br /> itupacted by these chemicals. <br /> • Continue to perform mouthly groundwater level measurements to determine predominant <br /> direction of flow. <br /> • Coutmue to perform groundwater monitoring to understand plume dimensions and to <br /> determine if the plume is in a growth mode,stable,or declining mode. <br /> • Groundwater sample testing will include MTBE,DO, and ORP. <br /> • The three domestic wells closest to this site will also be included in the quarterly testing- <br /> s. Mei&George Teranishi- 1600 West Durham Ferry Road <br />