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First Quarter 1995 Status Report 4 • Golden Grain Company, Manteca Bean Facility,229 Moffat Blvd, Manteca,CA April 6, 1995 but the level will be monitored during the next quarterly sampling event to verify that it Is not a recurring problem VAPOR EXTRACTION MONITORING During this report period, the VES was monitored each week The Influent and effluent vapor concentrations were measured for TPH-g using an FID Values measured during site visits this quarter are shown in table 3 On February 22, 1995, vapor samples were collected for analysis from the VES Influent and effluent of the catalytic oxidizer The samples were analyzed for BTEX and TPH-g and total lead Results of laboratory analyses are shown In table 5 Laboratory results indicate that effluent vapor concentrations for all compounds or analytes were below method detection limits except for xylenes, which was detected at 2 m g/I These effluent analysis results are below the 100 ppmv TPH-g limits set by the Unified Air Pollution Control District's Permit (No N-2625-1-0) to operate Before the VES was sampled, the applied vacuum was measured at the four operating vapor extraction wells and the induced vacuum was measured at two monitoring wells within the VES treatment area (tables 6 and 7) Readings were gathered to determine extraction well efficiency and • the influence of the vapor extraction wells on the surrounding soli Results of field data collected this quarter indicate expected vacuum effects on the surrounding area are similar to previous quarters data Before collecting ambient soil gas vapor concentration data, the vacuum applied to the vapor extraction wells was turned off for a period of 5 days This allowed the soil to reach static conditions before the collection of the vapor samples from the four vapor extraction wells and MW-5 and MW-6 On February 28, 1995, vapor samples were collected from these wells and subsequently analyzed for TPH-g and BTEX (table 8) CUMULATIVE TREATMENT SYSTEM MONITORING A total of 455,558 gallons of water was treated between December 10, 1994, and March 10, 1995 Since the project inception, approximately 3,270,013 gallons of water has been extracted and treated On February 16, 1995, samples were collected from the groundwater treatment system and analyzed for TPH-g, BTEX, total lead, organic lead, and ethylene dibromide at a California-certified laboratory Laboratory analysis reports and corresponding chain-of-custody records for the sampling event are included in attachment 4 Results of system historical analyses are summarized In table 4 Laboratory results indicate that all effluent water constituents analyzed were below the method 0102RO15 202 ETMGROUNDWATER TECHNOLOGY, INC