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' Former Manna Pro Site Page 4 Quarterly Groundwater Monitoring Report ' Project No 207 2 . December 11, 2001 ' Extreme care was exercised while collecting samples to prevent agitation of the water contained in the bailer Water samples were transferred from the bailer into 40 ml VOA vials preserved with hydrochloric (provided by the ' analytical laboratory) All samples were checked for head space bubbles, labeled, inserted into foam holders and placed in an lee chest cooled to 4°C for I ' transport to the laboratory Gasoline contaminated purge & rinseate water generated during the activities ' described above was stored in poly drums located on the site American Valley Environmental will remove this material prior to the next scheduled depth to water measuring event ' 2.2 Groundwater Sample Analyses ' Groundwater samples were analyzed as follows • Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method ' 8015(m) • Benzene, Toluene, Ethylbenzene, and Xylene (BTEX) by EPA method 602 The detection limits are included in the summary analytical data table (Table 1) Detectable levels of gasoline range petroleum hydrocarbons and/or BTEX compounds were found in water samples from four of the six wells that were sampled 2.3 Field Data ' The field data for this groundwater monitoring event are summarized in Appendix B and Table 1 The level of groundwater has fallen about 3 feet since the last groundwater monitoring event completed on June 8, 2001 The ' northeasterly bearing of groundwater flow, as shown in Figure 3, is generally consistent with past monitoring events and is also consistent with the direction observed in the Cutter Lumber site, adjacent to the north A ' groundwater high previously identified in the vicinity of MW-6 was still evident in this monitoring event Based on the field data obtained in this monitoring event, the overall groundwater gradient and bearing of flow as determined by a 3-point calculation from wells MW-4, MW-8 and MW-9 is 0 0018 ft/ft on a bearing of N46oE This compares with a gradient and bearing of 0 00019 ft/ft on a bearing of N660E from the June monitoring event 2937 Veneman Ave,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 Modesto, CA 95356 Fax (209) 569-0293