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' Former Manna Pro Site Page 4 Quarterly Groundwater Monitoring Report ' Project No 207 2 . April 2,2041 II ' Gasoline contaminated purge & nnseate 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 measunng event ' 2.2 Groundwater Sample Analyses P Y ' 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 Ifound in water samples from one of the four 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 risen about 1 3 feet since the last groundwater monitoring event completed on July December 5, 2000 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 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 00048 ft/ft on a bearing of N60°E This compares with a gradient and bearing of 0 00074 ft/ft on a bearing of N61°E from the December monitoring event I In order to evaluate the effectiveness of the OxygenRelease Compound ORC which was P ( )� placed in soil boring ORC-1 during recent pilot test program conducted in the spring of 2000, the level of dissolved oxygen in MW-6 is being monitored The oxygen level was determined with a YSI dissolved oxygen meter The `DO' readings have remained remarkably constant since then and no increase in oxygen was observed that could be attributed to the ORC material i I2.4 Waste Disposal Purge water from this monitoring event has been temporarily stored in 55-gallon drums on the site American Valley Waste Oil, a licensed hazardous waste hauler collected will remove the purge water for recycling prior to the next monitoring event On March 8, I2937 Veneman Ave,#11240 Geo-Phase Environmental Inc Phone(209)569-0293 IModesto,CA 95356 Fax(209)569-0293 1