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' Former Manna Pro Site Page 4 Quarterly Groundwater Monitoring Report Project No 207 2 August 18, 2000 ' 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 1 liter amber glass bottles and 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 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 summary analytical data table (Table 1) I Detectable levels of gasoline range petroleum hydrocarbons and/or BTEX compounds were found in water samples from four of the eight wells which 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 fallen over 1 foot since the last groundwater monitoring event completed in April of this year The bearing of groundwater flow as shown in Figure 3, has returned to a more typical direction after being unusually toward the south during the last monitoring event Generally, the direction of groundwater flow is to the north Ieast, which is also consistent with the direction observed in the Cutter Lumber site, adjacent to the north IBased 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 00058 ft/ft on a bearing of N580E This compares with a gradient and bearing of 0 0004 ft/ft on a bearing of S930E from the April monitoring event I2937 Veneman Ave,#8240 Geo-Phase Environmental Inc Phone (209) 569-0293 Modesto, CA 95356 Fax (209) 569-0293