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' Former Manna Pro Site Page 4 <br /> Quarterly Groundwater Monitoring Report <br />' Project No 207 2 <br /> • July 26, 2004 <br />' analytical laboratory) All samples were checked for head space bubbles, <br /> labeled, inserted into foam holders and placed in an ace chest cooled to 4°C for <br /> transport to the laboratory <br />' Gasoline contaminated purge & ranseate water generated during the activities <br /> described above was stored in poly drums located on the site American Valley <br />' Environmental will remove this material prior to the next scheduled depth to <br /> water measuring event <br />' 2.2 Groundwater Sample Analyses <br />' Groundwater samples were analyzed as follows <br /> Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method <br />' 8015(m) <br /> • Benzene, Toluene, Ethylbenzene, and Xylene (BTEX) by EPA method 602 <br />' The detection limits are included in the summary analytical data table (Table 1) <br /> Detectable levels of gasoline range petroleum hydrocarbons and/or BTEX <br /> compounds were found in water samples from 4 of the 9 wells that were <br /> sampled <br /> 2.3 Field Data <br /> The field data for this groundwater monitoring event are summarized an Table <br /> 1 The level of groundwater has fallen about 15 feet since the last <br /> groundwater_monitoring-event completed_on_March _171h, 2004 As shown-in <br /> Figure 3, the gradient as consistent with its historical norms with a northeast <br /> bearing of flow <br /> Based on the field data obtained an this monitoring event, the overall <br /> groundwater gradient and bearing of flow as determined by a 3-point <br /> calculation from wells MW-4, MW-8 and MW-9 as 0 0014 ft/ft on a bearing of <br /> N61°E This compares with a gradient and bearing of 0 0016 ft/ft on a bearing <br /> of N63-E from the June monitoring event <br /> 2.4 Waste Disposal <br /> Purge water from this monitoring event was temporarily stored in 55-gallon <br /> drums on the site The waste water will be removed for recycling prior to the <br /> next monitoring event Purge water from the prior event was collected on <br /> 2937 Veneman Ave ,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 <br /> Modesto, CA 95366 Fax(209) 569-0293 <br />