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Former Manna Pro Site Page 4 Quarterly Groundwater Monitoring Report ' Project No 207 2 • October 21, 2004 analytical laboratory) All samples were checked for head space bubbles, labeled, inserted into foam holders and placed in an ice chest cooled to 4°C for 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 tEnvironmental 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 all 6 of the wells that were sampled 2.3 Field Data The field data for this groundwater monitoring event are summarized in Table ' 1 The level of groundwater has fallen about 3 feet since the last groundwater monitoring event completed on June 81h, 2004 As shown in Figure 3, the ' gradient 1s consistent with its historical norms with a northeast bearing of flow ' 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 0033 ft/ft on a bearing of ' N46°E This compares with a gradient and bearing of 0 0014 ft/ft on a bearing of N6 PE from the June monitoring event ' 2.4 Waste Disposal Purge water from this monitoring event was temporarily stored in 55-gallon drums on the site The waste water will be removed for recycling prior to the next monitoring event ' 2937 Veneman Ave,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 Modesto, CA 95356 Fax(209) 569-0293