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Environmental <br /> Resources <br /> Management <br /> 1277 Treat Boulevard <br /> Suite 500 <br /> Walnut Creek,CA 94597 <br /> 24 March 2014 (925)946-0455 <br /> (925)946-9968(fax) <br /> www.erm.com <br /> San Joaquin County Environmental Health Department <br /> 1868 Hazelton Avenue <br /> Stockton, CA 95205 <br /> Subject: Soil Investigation Work plan <br /> Exterran Lease Areas <br /> McDonald Island, California <br /> SITE BACKGROUND <br /> McDonald Island is a gas field used by PG&E to inject and store surplus <br /> natural gas during low demand periods and withdraw the stored gas <br /> during peak load periods (Figure 1). Two compressor stations have been <br /> continuously operated since startup by a subcontractor, Exterran. The <br /> station to the north, containing compressor units K3 through K-6, has <br /> been in operation for over 30 years. The southern station, with <br /> compressors K-7 through K-9 has been in operation since 2008. It is our <br /> understanding that Exterran will stop operations at the northern station <br /> in July 2014 with decommissioning efforts completing in November <br /> 2014. They will continue to operate the southern station. PG&E would <br /> like to determine whether impacts to the soil have been caused by the <br /> Exterran operation at both locations. <br /> PG&E provided an inventory of chemicals used by Exterran on the <br /> stations that indicated that lubrication oil, antifreeze (ethylene glycol) <br /> and used motor oil are stored and used onsite. MSDSs were also <br /> provided for natural gas pipeline fluids and natural gas condensate. <br /> Analytical results were also provided for oil water separator fluids and <br /> pipeline liquids. Based on this information, potential chemicals of <br /> concern (COCs) on the station are: <br /> • Benzene, toluene, ethylbenzene, xylenes <br /> • Pentane, hexane and hexane isomers <br /> • TPH diesel <br /> • TPH motor oil <br /> • Ethylene glycol <br /> • Metals <br />