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Mr Harlan Knoll, R E H S May 09, 2005 • 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 Hydac�m 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 samphng 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 analysi-O of l ztal Petroleum Hydrocai bons in the gasoline range,t rH-g j, the volatric aromatic hydrocarbon compounds(benzene, toluene, ethylbenzene, and total xylene isomers), the fuel oxygenates tertiary-Butyl alcohol(TBA),Methyl ternary-butyl ether(MtBE),Di- isopropyl Ether(DIPS), Ethyl terttwy-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 April 19, 2005 3 0 GROUNDWATER ANALYTICAL RESULTS Copies of the laboratory analytical reports prepared by STL San Francisco and the chain-of- custody documentation are contained in Attachment B All available previous analytical data are also summarized in Attachment C The analytical results for samples collected in 2004-05 are listed in Table 3 Groundwater from MW-3 was reported with 220 jig/L TPH-gasohne Benzene was reported as 5 5 µg/L The other aromatic hydrocarbons(toluene, ethylbenzene, and total xylene isomers) were reported at the levels as listed in Table 3 MtBE was reported "N D " at <0 50 µg/L The other method 8260B fuel oxygenates were reported as"N D"at their respective reporting limits Groundwater from MW-4 was reported with 2,200 pg/L. TPH-gasohne Benzene was reported at 3 1 pg/L The other aromatic hydrocarbons were reported as listed in Table 3 MtBE was reported "N D" at<0 50 µg/L The other method 8260B fuel oxygenates were reported as "N D " at their respective reporting limits H2 AGROUNDWATER CONSULTANCY