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CA <br /> TCE or PCE Non-TCE or PCE COC Other Wells that <br /> Equaled or Latest TCE Result Latest PCE Result that Result that Equaled or Provide More <br /> Operating Exceeded that Equaled or Equaledor Exceeded Exceeded the ACL wfhin Representative 2017 Significant <br /> Extraction ACL whhin Exceeded the ACL the ACL the Last Year(COC and Well Location Relative to COC Hydrologic or Trends? <br /> Well In the last (Concentration and (Concentration and Concentration and Plumes Equaling or Exceeding the Contaminant (If Yes,Increasing <br /> Well 2017 Year? Quarter/Year) quarter/Year) Quarter/Year) ACL-Potential Well Category Data? or Decreasing) Evaluation <br /> EWNA1 No NS 12.4 pg/L In 3Q06 0.530 pg/L in 4Q96 NS Upgradient/cross-gradient of NB COC MW477A NA Shut down in luly 2002.Upgradient/cross-gradient of NB <br /> plumes-plume stability. COC plumes.TCE has not exceeded the ACL since 3Q06 and <br /> PCE has not exceeded the ACL since 1996(last sampled in <br /> 3Q30).MW477A provides more representative plume <br /> stability data in area.Sampling not necessary. <br /> EWNA3 No NS 5.20 pg/L In 3Q05 0.70 pg/L in 2Q97 NS Upgradient/cross-gradient of NB COC None NA Shut down in July 2002.Upgradient/cross-gradient of NB <br /> plumes and screened above NB TCE B TCE plume.TCE has not exceeded the ACL since 3405 and <br /> Zone plume-plume stability. PCE has not exceeded the ACL since 2Q97(last sampled in <br /> 3Q10).Sampling not necessary. <br /> EW NA8 No NS Never exceeded 1.1 poo.in 3Q04 NS Located off-site,downgradient of NB MW521A NA Located off-site,downgradient of NS COC plumes.Well shut <br /> COC plumes-guard well. down in 2008.MW521A provides more representative <br /> guard well data. <br /> MW494A NA NS NA NA NS Crass-gradient of SB TCE None NA Well monitored TPH contamination from UST 147.Site <br /> plume/upgradient of UST 147-plume expected to be closed in 2017;sampling not necessary. <br /> stability. <br /> MW496A NA NS NA NA NS Cross-gradient of SB TCE None NA Well monitored TPH contamination from LIST 147.TPH- <br /> plume/downgradient of UST 147- d/TPH-g/rPH-mo not detected in 3Q14.Site expected to be <br /> plume stability. closed in 2017;sampling not necessary. <br /> Notes: <br /> Because of data quality concerns,data from the samples analyzed before 1996 were excluded from this <br /> evaluation. <br /> pg/L = micrograms per liter <br /> 3407 = third quarter 2007(quarter/year) <br /> ACL = aquifer cleanup level <br /> CCL = carbon tetrachloride <br /> COC contaminant of concern <br /> DCA = dichloroethane <br /> DCE = dichlomethene <br /> I = estimated concentration <br /> MW = monitoring well <br /> NA = not applicable <br /> NB = North Balloon <br /> NS = not sampled <br /> PCE = tetrachlomethene <br /> SB = South Balloon <br /> TCE = trichloroethene <br /> TPH = total petroleum hydrocarbons <br /> UST = underground storage tank <br /> VOC = volatile organic compound <br />