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iiivanferra Eanronmenra! sauces tCASE NARRATIVE QUANTERRA INCORPORATED PROJECT NUMMER 095143 General Comments Samples were received at 2 to 3 degrees Centigrade(C) as measured in the temperature blank and in the individual samples bottles. Sample"MW-4" was labeled "MW-4 RS" This sample was collected as a resample due to the fact that the sample container used on September 18, 1997, contained hydrochloric acid preservative, which was triple-rinsed from the bottle prior to sample collection The resample for this location used a certified clean container, which had not previously contained any acid, and the retest of this sample will be compared with the September I8 sample result Bath the Dissolved Gases and Ferrous Iron analyses were repeated from the resample vials Volatile Organics - Method 8260 The samples were analyzed for 1,2,4-Tnmethylbenzene, 2,4,6-Trunethylbenzene and Benzene, Toluene, Ethyl Benzene and Xylenes (BTEX) compounds only as requested on the Chain of Custody Record Duplicate laboratory control samples (DCS) were analyzed in lieu of LCS/MS/MSD due to limited sample volume ' Total Petroleum Hydrocarbons - Method TPH-D-TRIREGIONAL ' Duplicate laboratory control samples (DCS) were analyzed in lieu of LCS/yIS/MSD due to limited sample volume i aDissolved Gases in Water - liethod RSKSOP-175 (Quanterra COI) Dissolved Gases was performed by the Quanterra laboratory located in City of Industry, CA Ferrous iron - Method STNY3500 (Subcontracted Analysis - CLS) Ferrous iron analysis was subcontracted to CLS Laboratory in Rancho Cordova, CA The samples collected for this analysis onginally were collected m HCI-acidified glass vials as per project instructions However, the analyzing laboratory specified sample collection in a non- preserved zero headspace vial Therefore, one of the three non-preserved Mals collected for the Dissolved Gases analysis was used for ferrous iron analysis instead