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' Former Manna Pro Site Page 4 Quarterly Groundwater Monitoring Report Project No 207 2 ` August 1, 2003 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 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) f ' • 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 five of the eight 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 less than one foot since the last groundwater monitoring event completed on March 25th, 2003 As shown in Figure 3, the gradient is 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 0018 ft/ft on a bearing of N41oE This compares with a gradient and bearing of 0 0016 ft/ft on a bearing of N40oE from the March 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 Purge water from the prior events was collected for 2937 Veneman Ave,#B240 Geo-Phase Environmental Inc. Phone(209) 569-0293 Modesto, CA 95356 Fax(209) 569-0293