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� 1 <br /> Third Quarter 1993 Status Report September 17, 1993 <br /> i <br /> Golden Grain Company, Manteca Bean Facility, 229 Moffat Blvd , Manteca CA 4 <br /> Induced vacuum readings at wells close to the vapor extraction wells and smaller induced readings <br /> further away from the extraction wells <br /> Before collecting the VES ambient subsurface vapor concentration data, the normal vacuum applied <br /> to the vapor extraction wells was turned off for a period of 5 days This allowed the subsurface to <br /> reach static conditions before the collection of the vapor samples from the vapor extraction wells <br /> and MW-1, MWA MW-5, and MW-6 On August 18, 1993, vapor samples were collected from these <br /> wells and subsequently analyzed for TPH-G and BTEX (results in Table 6) Results of analyses��1, <br /> indicate that concentrations of hydrocarbons were detected in all of the wells except for MWand <br /> MW-6 The highest concentrations were found In samples from well MW-1, at 1,200 ppb TPH-G and <br /> 10 ppb benzene <br /> TREATMENT SYSTEM SUMMARY <br /> System operations and maintenance for the quarter Is summanzed below <br /> 06/28/93 System repairs completed and startup performed All components of <br /> system operating <br /> . 07/08/93 System operational <br /> 07/13/93 Vapor extraction system operational Lo-profile Air Stripper (LO-PRO) not <br /> operating Re-started and no problems found System operational <br /> 07/22/93 Vapor extraction system operational LO-PRO not operating Plates of air <br /> stripper fouled Cleaned and replaced plates and restarted system System <br /> operational <br /> 07/27/93 System not operating Fuse blown in main disconnect of catalytic <br /> scavenger Fuse could not be located System remained non-operational <br /> 07/30/93 System not operating Replaced catalytic scavenger fuse and restarted <br /> system System operational <br /> 08/05/93 Vapor extraction system operational LO-PRO not operating Fuse blown in <br /> rotron blower of LO-PRO Replaced fuse and cleaned plates of air stripper <br /> System restarted and operational <br /> 08/18/93 System not operating for vapor extraction monitoring Replaced lead <br /> scrubber solid state relays and restarted system System operational <br /> 08/25/93 System not operating Main heater lead to the lead scrubber had melted <br /> Could not remove System left non-operational <br /> 3679R013 070 <br /> DOW Gxo[nvl)WATER i <br /> TECHNOWGY,INC <br />