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Fourth Quarter 1994 Status Report 5 • Golden Grain Company, Manteca Bean Facility,229 Moffat Blvd , Manteca,CA December 22, 1994 Calculations using TPH-g concentrations and system flow rates obtained during field visits indicate that approximately 46 pounds of TPN-g were removed from the soil by the VES during this quarter The cumulative amount of hydrocarbons removed by VES since start-up is estimated at 3,443 pounds Less than 1 pound of TPH-g was removed from the groundwater during this quarter The cumulative amount of hydrocarbons removed from the groundwater is estimated to be approximately 7 pounds Calculations for mass removal from the vapor and groundwater treatment systems for the fourth quarter are included in attachment 3 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, as well as historical data from June 1994 are shown in table 3 The destruction efficiency of 100 percent was calculated using weekly FID readings of the catalytic oxidizer effluent vapor stream for the operational period from September 9 through December 9, 1994 All effluent vapor readings collected were below the 100 parts per million by volume (ppmv) TPH-g discharge limit specified by the Unified Air Pollution Control District Permit (No N-2625-1-0) to operate On November 17, 1994, 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 detection limit Results of effluent water sample analyses were below the City of Manteca Public Works Department industrial Wastewater Discharge Permit (No 92-2) limits No discharge of untreated system water occurred during any site maintenance events A total of 519,602 gallons of water was treated between September 9 and December 9, 1994 Since the project inception, approximately 2,814,455 gallons of water has been extracted and treated VAPOR EXTRACTION MONITORING On November 17, 1994, 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 These effluent analysis results are below the 100 ppmv TPH-g limits set by the Unified Air Pollution Control District's permit to operate Before the VES was sampled,the applied vacuum was measured at the three operating vapor extraction wells and the induced vacuum was measured at three 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 soil 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 November 22, 1994, vapor samples were collected from these wells and subsequently analyzed for TPH-g and BTEX (table 8) 0102RO44 202 GROUNDWATER BE9TECHNOLOGY, INC