Perchlorate in Arizona: Occurrence Study of 2004

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Table 3: Results from Sampling Groundwater Recharge Facilities – by countyMap # Site Location Site IdentificationDate SamplesCollectedResults(ppb)ReportingLimits (ppb)La Paz County – downstream of Wilmer Pumping Plant43-P Vidler Recharge Facility DG-01 12/3/2003 2.3 244-P Vidler Recharge Facility DG-02 12/3/2003 ND 245-P Vidler Recharge Facility UG-01 12/3/2003 4.4 2Maricopa County – downstream of Lake Pleasant7 Agua Fria Managed Recharge Project MW-2 7/27/2004 4.8 28 Agua Fria Managed Recharge Project MW-3 7/27/2004 4.3 226 City of Chandler Tumbleweed Recharge Obs-3A; #55-570787 6/22/2004 ND 228 City of Peoria Beardsley Recharge MW-2; #55-569358 7/6/2004 ND 239 Glendale Arrowhead Recharge 8/12/2004 ND 240 Granite Reef Underground Storage RCMWGR2 6/21/2004 ND 241 Granite Reef Underground Storage RCMWGR3 6/21/2004 2.7 2Pima County – downstream of Brady Pumping Plant2-P Avra Valley Recharge CAP inlet 5/13/1999 ND 49 Avra Valley Recharge AVMW-01 7/13/2004 2.4 221 CAVSARP WR262A 7/8/2004 2.4 222 CAVSARP WR314A 7/8/2004 2.3 276 Sweetwater Underground Storage WR-69B 7/8/2004 ND 277 Sweetwater Underground Storage WR-68B 7/8/2004 ND 2Notes: P denotes pre-2004 sampling; results will be shown on Figure 4.14
Groundwater: Thirty five groundwater samples were collected as part of this study and aresummarized in Table 2. The sampling focused on wells used for domestic and municipal watersupplies along the Colorado River from Bullhead City to Yuma, wells in areas utilizing CentralArizona Project water for irrigation or livestock watering, and wells near concentrated animalfeeding operations. Of these, four samples had results above the detection limit of 2 ppb. Onesample near Buckeye was slightly above the detection limit at 2.5 ppb. The other three sampleswith results above detection, ranging from 3.4 ppb to 15 ppb, were found in monitoring wells inthe Yuma area and are adjacent to agricultural lands irrigated with Colorado River water (e.g.,Chemehuevi Indian Reservation and the Yuma area). Results from a background site, the BillWilliams Watershed at Planet Ranch, showed no perchlorate present. The task forcerecommends additional confirmation sampling in areas showing impact from perchlorate.Groundwater Recharge Facilities: Nine groundwater recharge facilities representing differenttypes of source water (e.g., Colorado River water and effluent) and recharge methods (e.g., basinsand wells) were sampled as part of this study. The results are summarized in Table 3. Theserecharge projects serve as a central component for municipal and state water banking strategies,whereby excess Colorado River water is stored in underground aquifers for use during times ofdrought or excess treated effluent is stored for recovery during times of higher demand. Facilitiesthat recharge Colorado River water had perchlorate concentrations ranging from 2.3 ppb to 4.8ppb and generally reflect the concentrations of the source water at those locations (see Table 1for CAP Canal water quality results). Perchlorate was not detected at any treated effluentrecharge facility, regardless of the recharge method. The Sweetwater Underground StorageFacility in Tucson and the Beardsley Wastewater Treatment Plant Recharge Facility in Peoriarecharge through basins. The City of Chandler’s Tumbleweed Recharge Facility and the City ofGlendale’s Arrowhead Recharge Facility recharge with wells.The CAP Canal system brings Colorado River water from the Wilmer Pumping Plant nearParker Dam to metropolitan Phoenix and then south to the City of Tucson. Perchlorateconcentrations in the canal are following the same declining patterns as seen on the main stem ofthe river. Levels on the river at the Wilmer Pumping Plant are currently around 4-5 ppb and theresults at the first downstream recharge facility, Vidler Water Company, reflect similarconcentrations. Similarly, concentrations in Lake Pleasant and the CAP Canal downstream ofthe lake range between 2.2 and 3 ppb. Perchlorate concentrations in the recharge facilitiesdownstream range from less than detection to 4.8 ppb at the Agua Fria Recharge Project.Concentrations in the CAP Canal from McKellips Bridge to its terminus south of the San XavierPumping Plant reflect a downward trend from 2.7 ppb in the metropolitan Phoenix area to 2.3ppb in Tucson. The recharge projects in Pima County show concentrations just above detectionat 2 ppb to 2.4 ppb.Prior to this study, little to no sampling for perchlorate had been conducted at groundwaterrecharge projects. The task force recommends the continued monitoring of select undergroundstorage facilities to determine the impacts of long term storage of Colorado River water on theaquifer system. Little is known about how perchlorate behaves in the subsurface. Additionalmonitoring should also be done peripherally to the projects to determine if there is any lateralmigration.15
Page 1 and 2: Perchlorate in ArizonaOccurrence St
Page 3 and 4: ADDENDUMPerchlorate Report for 2004
Page 5 and 6: Perchlorate Task ForceArizona Depar
Page 7 and 8: Executive SummaryIn March 2004, the
Page 9 and 10: Perchlorate in ArizonaOccurrence St
Page 11 and 12: Figure 1 shows the locations of sam
Page 13 and 14: Figure 2: Sample Results-9 -
Page 15 and 16: 70 SRP Arizona Canal downstream of
Page 17: Table 2: Results from Sampling Grou
Page 21 and 22: Figure 3: Pre-2004 Sample Locations
Page 23 and 24: Figure 4: Pre-2004 Sample Results19
Page 25 and 26: Table 4: Known Sites with Perchlora
Page 27 and 28: Yuma Marine Corps Air Station(not o
Page 29 and 30: EVALUATION OF THE NATIONAL ACADEMY
Page 31 and 32: EVALUATING THE EFFECT OF PERCHLORAT
Page 33 and 34: SELECTED REFERENCESArizona Departme
Page 35 and 36: Perchlorate Occurrence StudySamplin
Page 37 and 38: 1.0 Project OverviewThis reconnaiss
Page 39 and 40: 2.0 Site IdentificationA wide varie
Page 41 and 42: Table 2.1 - List of proposed sampli
Page 49 and 50: 3.0 Project Data Quality Objectives
Page 51 and 52: 3.3.1.3 Trip blanks and field equip
Page 53 and 54: 5.0 Request for AnalysisEPA Method
Page 55 and 56: of 100 gallons of this solution wil
Page 57 and 58: 8.0 Disposal and Equipment Decontam
Page 59 and 60: 9.2 PhotographsIf photographs are t
Page 61 and 62: 10.0 Quality Assurance/Quality Cont
Page 63 and 64: 11.0 Field Health and Safety11.1 Pu
Page 65 and 66: 11.5 Personal Protective EquipmentB
Page 67 and 68: Appendix A1GROUNDWATER FIELD METHOD
Page 69 and 70:
Appendix A2LAKE MONITORING FIELD ME
Page 71 and 72:
iii.iv.Use a 1-liter wide-mouthed s
Page 73 and 74:
Appendix A4HOSPITAL EMERGENCY ROOMS
Page 75 and 76:
West Valley Emergency CenterGoodyea
Page 77 and 78:
Appendix BMapNo. Site Location Sour
Page 79 and 80:
62 Martinez Lake SW 5/17/2004 ND 2
Page 81 and 82:
29 Las Vegas Bay surface SW 4/15/19
Page 83:
99 Luke AFB gw well GW 5/26/1999 ND
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Perchlorate in Arizona: Occurrence Study of 2004

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