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Mr Harlan Knoll, R E H S Apri128, 2004 Page 2 The monitoring wells were purged with a 12-volt battery operated submersible pump and sampled with a discharge rate of less than 1 L/mmute Field measured water quality parameters were measured using a Cambridge Scientific Industries Hydan Conductivity Temperature pH Tester The appropriate information was logged onto the field sampling forms Well purging activities and the field measured water quality parameters are documented on the forms included in Attachment A Groundwater samples from each well were collected into four 40-mL glass vials with Teflon septum lids Following sample collection, each sample bottle was labeled with the sample designation, date and tune, and the initials of the sampler The sample bottles were then placed into an ice chest maintained at the temperature available from its also containing a bed of crushed ice, and its melt water, placed there at the start of the sampling day The ice was not allowed to completely melt before it was replaced The sample number, date, and time was entered onto a chain-of-custody form that included the request for analysis of Total Petroleum Hydrocarbons in the gasoline range (TPH-g),the volatile aromatic hydrocarbon compounds(benzene, toluene, ethylbenzene, and total xylene isomers), the fuel oxygenates tertiary-Butyl alcohol (TBA), Methyl tertiary-butyl ether(MtBE), Di- isopropyl.Ether(DIPE), Ethyl tertiary-butyl ether(ELBE), and tertiary-Amyl methyl ether (TAME)by U S E P A Method 8260B The samples and chain-of-custody documentation were then delivered to STL San Francisco (CA DHS ELAP#2496) of Pleasanton, California on March 22, 2004 3 0 GROUNDWATER ANALYTICAL RESULTS Copies of the laboratory analytical reports prepared by STL San Francisco and the cham-of- custody documentation are contained in Attachment B All available previous analytical data are also summarized in Attachment C Groundwater from MW-3 was reported with 76 pg/L TPH-gasoline All other method 8260B analytes were reported as"N D" at their respective reporting limits Groundwater from MW4 was reported with 530 µg/L TPH-gasoline The aromatic hydrocarbons wee reported as follows benzene 14 gg/L, toluene 2 2 gg/L, ethylbenzene 6 4 µg/L, and total xylene isomers 4 1 µg/L All method 8260B fuel oxygenates were reported as "N D " at their respective reporting hmits H 20 G E 0 L A GROUNDWATER CONSULTANCY