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E Musco Family Olive Company - 15 - 12 December 2006 E 4 located furthest up-gradient of the Title 27 surface impoundments and adjacent to Evap South spray field were spray irrigation has been on-going since 2000. Well W-2 is the furthest well down-gradient of the Title 27 surface impoundments and well MW-10 is in Check Field 1-4, near the eastern property boundary. Based upon the limited analytical data, it appears that high TDS, chloride, and sodium have impacted groundwater in this area. It should be noted that bicarbonate in these wells was detected between 348 (W-2) mg/L to 537 (MW-10) mg/L, which is similar to other groundwater wells affected by land-applied wastewater. Groundwater wells that have been impacted by the Reservoir or 1-million gallon pond have significantly higher concentrations of bicarbonate when compared to wells affected by spray irrigation. Concentrations of bicarbonate from wells.affected by leakage from the Reservoir or 1-million gallon pond. ranged between 900 mg/L (MW-15) to 1,600 mg/L (MW-16). Wells that appear only to be affected by spray irrigation have bicarbonate concentrations that range from k 348 mg/L (W-2) to 432 mg/L (MW-14). Well MW-17 Well MW-17 was installed in June 2005 and has a limited data set. Well MW-.17 is near the E southeastern corner of Pond B and has been installed at a depth of approximately 70 feet bgs. The well is adjacent to the Evap South spray field. Upon review of the analytical results from the last four available sampling events, it is apparent that groundwater in the vicinity of well MW-17 contains elevated chloride and sodium concentrations when compared to the interim standards and the Regional Well. TDS has remained consistent over the last four events at an average concentration of 1,975 mg/L, just under the interim limit of 2,047 mg/L. However, when TDS concentrations are compared to the Regional Well, MW-17 is approximately 700 mg/L higher. ` Bicarbonate concentrations detected in well MW-17 are relatively high when compared to f wells affected by spray irrigation only. The average bicarbonate concentration presented in Table 8 for well MW-17 is 600 mg/L, which is nearing the lower end of the bicarbonate range (900 mg/L) detected;in wells affected by the Reservoir and 1-million gallon pond. When bicarbonate concentrations are mapped from the Reservoir in the west through the drainage swale to the eastern property boundary of the Musco facility, it appears that MVV-17 is near the bicarbonate front associated with wastewater leaking from the Reservoir and 1-million gallon pond. Based on this, it appears that groundwater through the drainage swale has been impacted by not only spray irrigation activities but also by the Reservoir and 1-million gallon pond. Furthermore, groundwater impacts likely extend offsite. Well MW-17 is the only shallow groundwater well in the lowlands drainage swale monitoring groundwater quality. Deep Wells In general, deep groundwater monitored beneath the Musco facility is of higher quality than observed in the shallow zone. Deep groundwater is more sulfate dominant and bicarbonate concentrations range between 238 and 530 mg/L. Wells MW-4, MW-7, MW-8, MW-12, and MW-18 monitor water quality within this zone. Groundwater flows toward the northwest at a