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fit <br /> �F <br /> Manteca Bean Facility, 229 Moffat Boulevard, Manteca, California April 2, 1993 <br /> Golden Grain Company Page 4 <br /> j was later determined (March 4) that the connecting subsurface pipes contained significant amounts of <br /> standing water caused by recent rainfall Corrective action was taken to remove this water and return <br /> the VES to full operating efficiency System readings taken after this work are in Tables 5B and 5C <br /> Following the collection of VES vacuum data, the normal vacuum applied to the vapor extraction wells <br /> was turned off for a period of five days This was done to allow the subsurface to reach static <br /> conditions prior to the collection of the vapor samples from the vapor extraction wells and MW-1, MW-4, <br /> j MW-5 and MW-6 On February 23, 1993 vapor samples were collected from these wells and <br /> subsequently analyzed for TPH-G and BTEX (results in Table 5A) Results of analysis indicate that <br /> concentrations were below detection limits for MW-1, MW-2, MW-3, MW-5, and MW-6 Concentrations <br /> detected in MW-4 were 830 ppb TPH-as-G and 15 ppb benzene <br /> TREATMENT SYSTEM SUMMARY <br /> i <br /> System operations and maintenance for the quarter is summarized below <br /> 01/07/93 System not operating Moisture disrupting thermocouple connection for the lead <br /> scrubber Correction made System operational <br /> 01/14/93 System operational LEL sensors calibrated Adjusted influent LEI-to 15% <br /> 01/21/93 System operational <br /> 01/28/93 Vapor extraction system (VES) operating Lo-Profile Air Stripper (LO-PRO) not <br /> operating Restarted LO-PRO System operational <br /> 02/03/93 VES operational LO-PRO not operating because of iron and calcium fouling LO-PRO <br /> trays removed and cleaned Restarted System System operational <br /> 02/11/93 System operational <br /> 02/18/93 System operational Quarterly monitoring and sampling performed Vapor extraction <br /> monitoring performed VES wells valved off System operating with fresh air only <br /> 02/23/93 System operational with fresh air Monitoring of wells performed again to identify <br /> influence of vapor system on groundwater levels Ambient vapor samples collected <br /> VES vacuum reapplied to extraction wells <br /> 03/04/93 System operational Standing water in subsurface pipes of VES removed LO-PRO not <br /> operating because of fouling Trays removed and cleaned Air stripper restarted <br /> System operational <br /> arRi MCS TECHNOLOGY, <br /> TECHNOLOGY,INC <br />