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a' Manteca Bean Facility, 229 Moffat Boulevard, Manteca, California October 22, 1992 Golden Grain Company Page 3 may have caused these results Secondly, these trace amounts could also have been the result of contact or trace contamination during laboratory work performed on the water samples During subsequent monitoring and sampling at the site, these two (MW-14 results and field blank results) issues will be monitored closely Treatment System Installation and Operation The groundwater and sod treatment system designed to remove dissolved hydrocarbons from groundwater and sod beneath the site was installed in August and September Prior to work on site, all necessary permits with The City of Manteca, the county air board, and the County Health Department have been procured and followed Construction began August 11, 1992 All underground and above ground construction was performed and completed by September 4, 1992 The final building permit was issued on September 10, 1992, and the official start up date was September 14, 1992 The system consists of a low profile air stripper, a catalytic oxidizing unit, and a lead extractor All • of the equipment is within a 27400t by 12-foot curbed concrete slab surrounded by a 6-foot high chain link fence The low profile air stripper treats the hydrocarbons in the water from recovery well 1 (RW-1) by stripping them off of the water molecules as they pass down the baffles of the stripper The lead extractor treats the vapors coming out of the sod by using a chemical reaction between silica gel within the unit and the vapors to change the organic lead in the air stream into metallic lead and capture a The catalytic oxidation unit treats the vapors from the soil as well as the off gas from the air stripper by burning the hydrocarbons so they will not be discharged to the atmosphere Upon start-up of the site system, samples were taken from the influent and effluent of both the groundwater treatment equipment as well as the vapor extraction and treatment system Samples collected were analyzed by a certified laboratory for BTEX, TPH-as-gasoline, and total lead, with vapor extraction system samples analyzed for TPH-as-gasoline using a flame ionization detector (FID) Results and dates of these sampling events are presented in Tables 3 and 4 Lead sample analysis results have not been received from the laboratory As indicated by the laboratory analysis results of both the vapor extraction and groundwater treatment system effluent samples (Tables 3 and 4) all discharge parameters for permits from the Unified Air Pollution Control District and the City of Manteca Public Works Department have been met for this quarterly reporting period All laboratory analysis reports, and chain-of-custody manifest for this reporting period are included in Attachment 1 _ _&GROUNDWATER Ir-'TECHNOLOGY, INC