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' Former Manna Pro Site Page 11 Quaiteily Groundwatei Monitoring Report ' & Monitoring Well Construction Project No 207 2 June 2 2000 1 i Extreme care was exercised while collecting samples to prevent agitation of the ' water contained in the bailer Water samples were transferred from the bailer into 40 ml VOA vials preserved with hydrochloric (provided by the 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 Waste Oil removed the waste water for recycling The waste disposal documents are attached in Appendix D 4.2 Groundwater Sample Analyses Groundwater samples obtained during this monitoring event were analyzed as follows 0 Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method 8015(m) 10 • Benzene, Toluene, Ethylbenzene, and Xylene (BTEX) by EPA method 602 • The sample from MW-11 was also tested for the presence of Total Extract able Petroleum Hydrocarbons by EPA method 351018015(m) and for the presence of 1,2 Dichloroethane (DCA) by EPA method 601 • The sample from MW-11 was also tested for the presence of 5 oxygenated gasoline compounds including MTBE by EPA method 8260B 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 three of five wells which were sampled The MW-11 sample did not contain detectable TEPH compounds, oxygenated gasoline additives, or 1,2 DCA 4.3 Field Monitoring & Analytical Data The field data for this groundwater monitoring event are summarized in Appendix B and Summary Table 1 The groundwater has risen approximately 3 feet since the last groundwater monitoring event completed in January The bearing of groundwater flow is depicted in Figure 3 Generally, the direction of Igroundwater flow has been to the northeast, which is also consistent with the direction observed in the Cutter Lumber site, adjacent to the north In this 2937 Veneman Ave,#B240 Geo-Phase Environmental Inc. Phone (209) 569-0293 Modesto, CA 95356 Fax (209) 569-0293