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Second Quarter 1994 Status Report 5 <br /> Golden Grain Company, Manteca Bean Facility, 229 Moffat Blvd , Manteca, CA July 18, 1994 <br /> table 4 Laboratory results indicate that all effluent water constituents analyzed were below the <br /> method detection limit Results of effluent water sample analyses were below the City of Manteca <br /> Public Works Department Industrial Wastewater Discharge Permit (Permit No 92-2) limits <br /> On March 3, 1994, an additional catalytic in-line water conditioner was installed in the groundwater <br /> treatment influent piping This unit was installed to reduce the need for frequent cleaning of the site <br /> air stripper and thereby increases treatment system operational time Throughout the quarter, the air <br /> stripper was dismantled and inspected to evaluate the effectiveness of the catalytic water conditioner <br /> installed The water conditioner has been softening the water and making the air stripper cleaning <br /> easier and less frequent The water conditioner has not eliminated the fouling problem completely, <br /> but it has decreased the groundwater treatment system downtime by reducing the amount of air <br /> stripper fouling No discharge of untreated system water occurred during any site maintenance <br /> events A total of 533,263 gallons of water was treated between March 3 and June 9, 1994 <br /> VAPOR EXTRACTION MONITORING <br /> On May 19 and 25, 1994, vapor extraction monitoring was conducted to evaluate the subsurface <br /> Y p g <br /> effects of the VES and quantify the static vapor concentrations of TPH-g in the soils located within <br /> the VES treatment area On May 19, 1994, air samples were collected for analysis from the VES <br /> influent, the effluent of the lead scrubber, and the effluent of the catalytic scavenger unit The <br /> samples were analyzed for BTEX, TPH-g, and total lead Results of laboratory analyses are shown in <br /> table 5 Laboratory results indicate that effluent concentrations for all compounds or analytes were <br /> below method detection limits These effluent analysis results are below the 100 ppmv TPH-g limits <br /> set by the Unified Air Pollution Control District's permit to operate <br /> Before the VES was sampled, the applied vacuum was measured at the two vapor extraction wells <br /> and the induced vacuum was measured at the monitoring wells within the VES treatment area <br /> (tables 6 and 7) Readings were taken using a magnahelic gauge measured in inches of water <br /> vacuum Readings were gathered to determine extraction well efficiency and the influence of the <br /> vapor extraction wells on the surrounding soil Results of field data collected this quarter indicate <br /> the expected vacuum effect on the surrounding area The Vapor Extraction Pilot study performed in <br /> 1990 determined a radius of influence ranging from 55 feet to 90 feet depending on the air flow rate <br /> being pulled from the test extraction well The readings collected on May 19, 1994, showed <br /> influence 70 feet away from well MW-2 at a flow rate of approximately 98 cubic feet per minute <br /> (cfm) This corresponds with the expected radius of influence determined from the pilot study <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 /> • <br /> 5510R024 020 <br /> ETGROUNDWATER <br /> TECHNOLOGY,INC <br />