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Mr Harlan Knoll, R E H S July 13, 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 Hydac7l' 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 time, 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 to the gasoline range(TPH-g),the volatile aromatic hydrocarbon compounds(benzene, toluene, ethylbenzene, and total xylene isomers), the fuel oxygenates ternary-Butyl alcohol (TBA),Methyl tertiary-butyl ether(MtBE), Di- isopropyl Ether(DIPE), Ethyl tertiary-butyl ether(EtBE), 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 May 28, 2004 3 0 GROUNDWA'T'ER ANALYTICAL RESULTS Copies of the laboratory analytical reports prepared by STL San Francisco and the chain-of- custody hain-ofcustody documentation are contained in Attachment B All available previous analytical data are also summarized in Attachment C The analytical results for samples collected in 2004 are listed in Table 3 Groundwater from MW-3 was reported with 77 pg/L TPH-gasoline Ethylbenzene was reported at 17 pg/L and total xylenes at 2 7 gg/L All other method 8260B analytes were reported as "N D " at their respective reporting limits Groundwater from MW-4 was reported with 2,400 gg/L TPH-gasoline The aromatic hydrocarbons wee reported as follows benzene 2 3 pg/L, toluene 9 3 pg/L, ethylbenzene 120 pg/L, and total xylene isomers 86 pg/L All method 8260B fuel oxygenates were reported as "N D " at their respective reporting limits H2OGEOL A GROUNDWATER CONSULTANCY