ARCHIVED REPORTS XR0009551 - Laserfiche WebLink

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1 Former Manna Pro Site Page 4 Quarterly Groundwater Monitoring Report ' Project No 207 2 April 23, 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 & rznseate 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 surnmary analytical data table (Table 1) Detectable levels of gasoline range petroleum hydrocarbons and/or BTEX compounds were found in water samples from three of the four wells that were I sampled 2.3 Field Data The field data for this groundwater monitoring event are summarized in Table 1 The level of groundwater has changed little since the last groundwater monitoring event completed on December 19, 2002 As shown in Figure 3, the gradient is consistent with its historical norms with a northeast bearing of Iflow The groundwater high generally present near the observation well OB-5 remains has diminished and shifted to the west somewhat 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 0016 ft/ft on a bearing of N400E This compares with a gradient and bearing of 0 0019 ft/ft on a bearing of N49°E from the September monitoring event 2937 Veneman Ave ,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 Modesto, CA 95356 Fax (209) 569-0293