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N • <br /> Attachment 1 <br /> Table 1 - Groundwater Extraction and Treatment System Operation <br /> Period of O eration Extraction Wells Reason for Shutdown <br /> Limitations at Shell Refinery <br /> 24 in Martinez,NPDES p <br /> February 1993 —April MW-I,MW-23,MW- it <br /> rocessin . <br /> 1993 <br /> MW 1,MW-23,MW-24, <br /> Carbon replacement. <br /> November 1994— MW-11,MW-16, <br /> October 1997 MW-17(4195) <br /> MW-1,MW-11,MW 16. No reason provided. <br /> April 1998— MW-17,MW-23,MW 24 <br /> November 1998 MW_16Applicable. <br /> September 1999 - Mw-11 MW-11, , Not A p <br /> Present MW-17,MW-23,MW-24 <br /> Table 2 - Groundwater Extraction and Treatment System Operation Mass Removal <br /> Mass Removed <br /> Period of O eration Mass <br /> Contaminants ounds) <br /> February 1993 — Benzene 29 <br /> November 1998 TPPH 164 <br /> Total Extractable Petroleum Hydrocarbons 89 <br /> Table 3 — Soil Vapor Extraction and Treatment System Operation <br /> 7November <br /> rationgopffated <br /> for Shutdown <br /> —June 1998e manual s. <br /> ptemberyst problems. <br /> onstruction <br /> 1998 - The SUETS has1998 perated since 1998. <br /> Table 4— Soil Vapor Extraction and Treatment System Operation Mass Removal <br /> rApril <br /> f Operation oved <br /> Mass(pounds) <br /> —December 1998jiTP7PH <br /> 1,862 <br /> 12,470 <br />