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Ms Vicki McCartney June 30, 2003 Page 2 2 0 MONITORING WELL PURGING AND SAMPLING Monitoring wells MW-1 through MW-7 were purged and sampled using an ES-60 submersible pump marketed for monitoring well purging by Enviro-Tech Services Co. of Martinez, California. Monitoring well MW-8 was purged using a high yield 12-24 volt submersible electric pump due to its higher purge volume and then sampled at a controllable rate using an ES-60 submersible pump. Field measured water quality parameters were measured using a Cambridge Scientific industries HydaJm 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 in Attachment A- Following completion of well purging and field parameter determination the pump discharge was reduced to less than 1 L/min. Groundwater samples were collected into four 40-mL glass vials with Teflon septum lids. Following sample collection, each sample bottle was Iabeled with the sample designation, date and time, and the initials of the sampler. The sample bottles were then placed directly into a divided plastic box located in an ice chest maintained at the temperature 2 available from its also containing and bed of crushed ice 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 were entered onto a chain of-custody form that included the request for analysis by U S EPA Method 8260FAB for total petroleum hydrocarbons in the gasoline range (TPH-gasoline or TPHG), for the volatile aromatic hydrocarbon compounds (benzene,toluene, ethylbenzene, and total xylene isomers), and for the Fuel Oxygenates: tertiary- Butyl alcohol(TBA);Methyl tertiary-butyl ether (MtBE);Di-isopropyl Ether(DIPE); Ethyl tertiary-butyl ether(EtBE);and tertiary-Amyl methyl ether(TAME) Samples and chain-of-custody documentation were then delivered to STL San Francisco (CA DHS ELAP#2496) of Pleasanton, California Copies of the monitoring well groundwater sample laboratory reports and the chain-of-custody form are included in Attachment B. 3 0 GROUNDWATER ANALYTICAL RESULTS Groundwater samples were submitted to STL San Francisco for analysis using EPA Method 8260FAB on June 02, 2003 Copies of the laboratory report and chain-of-custody documentation are contained in Attachment B The analytical results are summarized in Table 3. Total petroleum hydrocarbons in the gasoline range (TPHG) •,vere not detected in groundwater samples from the eight wells. The reporting limit for the samples from MW-5 and MW-8 were elevated(<250 pg/L) due to the presence of lugher concentrations of MtBE. The remaining wells were reported as"N.D. at<50 pg/L See Table 3 and Figure 3. H2OGEOL AGROUNDWATER CONSULTANCY