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i Manteca Bean l=aciW, 229 Moffat Boulevard, Manteca, Caldomia October 22, 1992 Golden Grain Company Page 4 During the period from September 11, 1992 to October 5, 1992, air velocity readings and groundwater pumping rates were monitored in conjunction with site visas for maintenance and sample collection These readings have been used together with influent and effluent sample results to determine that approximately 153 6 pounds of TPH-as-gasoline have been removed from the sod, via the vapor extraction system, and approximately 2 25 pounds TPH-as-gasoline have been removed from groundwater via the groundwater extraction system r, The groundwater and soil treatment system operated continuously from start-up except for three isolated cases The heater on the lead extractor burned the insulation of two of the wires to the heating element and shut the system down twice for two days, and the air stripper high pressure shut off triggered the air stripper to shut down once due to calcium carbonate build up The heater connections were fixed during a regularly scheduled site visa, the air stepper was cleaned with an acid wash to enable it to operate at peak efficiency The sod vapor extraction system continued to operate when the air stripper was not operational, however no water was being pumped or treated during that period An operational log book is being kept on site to track the progress of the site hY, remediation, and equipment operation Please contact Groundwater Technology's Concord office if you have any questions or comments regarding this report Sincerely, Groundwater Technology, Inc. Groundwater Technology, Inc Written/Submitted by R4hnstoph'er Appro y Matt Sutton P DeSocio Staff Engineer Project Manager Avid R Weesattel Registered Geologis .(E�� GAG<0 No 5136 DAVID R KLEESATTEL cc Mr Noah Horowitz NQ 5136 Attachments q�F O F C A4�F�Q 30TR92 RPT GROUNDWATER y J... TECHNOLOGY, INC