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Former Manna Pro Site Page 5 Quarterly Groundwater Monitoring Report Project No 21112 12 November 1999 ' 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 3.2 Groundwater Sample Analyses 1 Groundwater samples were analyzed as follows ' • Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method 8015(m) • Total Petroleum Hydrocarbons as Diesel (TPH as Gasoline) by EPA method 3030/8015(m) 9 Benzene, Toluene, Ethylbenzene, and Xylene (BTEX) by EPA method 602 The detection limits are included in the summary analytical data table(Table 1) o Additional analyses included testing for a suite of 5 gasoline oxygenated additives (Tertiary Butyl Alcohol, TBA, Methyl Tertiary Butyl Ether, MTBE, Di-isopropyl Ether, DIPE, Ethyl Tertiary Butyl Ether, ETBE, and Tertiary Amyl Methyl Ether, TAME) using EPA method 8260 The detection limits for these chemicals are 5 ppb except for TBA which has a detection limit of 20 ppm Sample dilution may result in an increase in practical detection limits Two of the samples were also tested for the presence of 1,2 Dichoroethane ' (DCA) by EPA method 8260 The detection limit for this chemical is 5 ppb Detectable levels of gasoline range petroleum hydrocarbons and/or BTEX ' compounds were found in water samples from four of the five wells which were sampled No detectable levels of oxygenates were reported in any of the samples, but one sample from MW-1 contained 670 ppb of DCA 3.3 Field Data The field data for this groundwater monitoring event are summarized in Appendix B and Table 1 The level of groundwater has fallen approximately 3 6 feet since the groundwater monitoring event completed by Azure Environmental ' 2937 Veneman Ave,#13240 Geo-Phase Environmental Inc Phone (209) 569-0293 Modesto, CA 95356 Fax (209) 569-0293