ML071430138
| ML071430138 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 05/07/2007 |
| From: | Scherer A Southern California Edison Co |
| To: | Spitzberg B NRC Region 4 |
| References | |
| FOIA/PA-2009-0077 | |
| Download: ML071430138 (44) | |
Text
Nuclear Regulatory /\\n;iirs May 7, 2007 U.S. Nuclear Regulatory Commission Region IV Attn: Dr. B. Spitzberg 61 1 Ryan Plaza, Suite 400 Arlington, TX 7601 1-4005
SUBJECT:
GROUNDWATER CONTAMINATION AT SONGS UNIT 1 Docket Nos. 50-206 San Onofre Nuclear Generating Station, Unit 1
Dear Dr. Spitzberg,
Southern California Edison (SCE) is providing copies of correspondence between the City of San Clemente (the City) and the California Department of Health Services (DHS), Southern California Drinking Water Field Operations Branch, Santa Ana District regarding radionuclide monitoring of the Citys well 6. The enclosures are:
A. Radionuclide Monitoring Requirements for Well 6 System No. 301 0036, from Shu-Fang Orr, DHS, Santa Ana District, to Andrew J. Howard, City of San Clemente, dated September 8, 2006 B. Hydrogeologic Assessment: Potential Impacts to San Clemente Groundwater Resources of Tritiated Groundwater at SONGS - In Re Well No. 6 System No.
301 0036, from David N. Lund, City of San Clemente, to Shu-Fang Orr, DHS, dated January 11, 2007 C. Vulnerability Assessment and Radionuclide Monitoring Requirements for Well 6 System No. 3010036, from Shu-Fang Orr, DHS, to David N. Lund, City of San Clemente, dated January 22, 2007 Also enclosed for your information is Well No 6 Influence Area Study dated November 2006 (Enclosure D) that was prepared for the City of San Clemente by AKM Consulting Engineers.
If you have any questions, feel free to contact Kathleen Yhip of my staff at 949 368-7633.
Sincerely, Enclosures cc:
J. C. Shepherd, NRC Project Manager, San Onofre Unit 1 C. C. Osterholtz, NRC Senior Resident Inspector, San Onofre Units 2 and 3 S. Y. Hsu, California Dept. of Health Services, Radiologic Health Branch P.O. Bo\\ 128 San Clemeiitc, CA 92672 949-368-750 1
Fa\\ 949-368-7575
ENCLOSURE A RADIONUCLIDE MONITORING REQUIREMENTS FOR WELL 6 SYSTEM N0.3010036
Q 0 01/ 0 0 2 09/12/2006 TUE 17:30 FAX P19 361 8234 C i t y of San C l s m s n t e SANDRA SHEWRY Pirector September 8,2006 MT. Andrew J. Howard, Utilities Manager City of San Clemente 380 Avenida Pico, Building N San Clemente, CA 92672
Dear Mr. Howard:
RADIONUCLIDE MONiTORINQ REQUIREMENTS FOR WELL 6 SYSTEM NO. 3010036 ARNOLD SCHWARZENEGGER Governor Thank you for the information provided to this office regarding the leak of radioactive material from the San Onofre Nuclear Power Plant and the proactive measures taken by the City to ensure water produced by the City's water system is pure and safe.
It was disclosed by press media in mid-August 2006 that the S a n Onofre Nuclear Power Plant's retired reactor had leaked several thousand gallons of radioactive water containing tritium over an unknown period of time. The initial tests showed tritium concentration in groundwater beneath the retired reactor was higher than the drinking water standard. But it was lower than the maximum annual leakage permitted for nuclear power plants by the Nuclear Regulatory Commission.
The City's Well 6 is located approximately two miles away from the San Onofre Nuclear Power Plant. Upon learning the news on August 16,2006, the City collected groundwater samples from Well 6 for radionuclide analysis. On August 22, 2006, the Department received the laboratory report containing tritium, alpha, beta, uranium, and radon analysis results via facsimile (Enclosure I). Tritium and uranium concentrations in Well 6 a r e below their respective DLRs (I
,000 pCi/L for tritium and 1 pCi/L for uranium). In addition, alpha, beta and radon concentrations in this well are relatively low. It appears that Well 6 has not been adversely affected by the leak thus far.
W e understand that the City has contracted a hydrogeologist to study the geology and hydrology of the area and check the relation between the groundwater aquifer where Well 6 withdraws its water from and the groundwater aquifer beneath the San Onofre Nuclear Power Plant.
The Department has determined to temporarily place the City's Well 6 on the list of le sources to contamination by nuclear facilities as a precaution. The Do your part to help California save energy. To learn more about saving energy, visit the following web site:
~
c onsurnereneravcenter.ora/flex/index. htrnl Southern California Drinking Water Fleld Operations Branch, Santa Ana District 28 Civic Center Plaza, Room 325, Santa Ana, CA, 92701 4__
Telephone: (714) 558-4410 Fax; (714) 567-7262 i
Internet Address: WWM.dhs.ca.uovlDslddwem/
i
0 9 / 1 2 / 2 0 0 6 T U E 17:30 PPX 949 361 82.34 City of 6an Clamante
~ o o z / o o z Mr. Andrew J. Howard September 8,2006 Page 2 Department will re-evaluate the vulnerability of Well 6 upon receiving the hydrogeology study report. Please conduct the additional radionuclide monitoring for a vulnerable source in accordance with Title 22, Section 64443 of the California Code of Regulations for Well 6.
A copy of the regulation is enclosed for your reference (Enclosure 2).
In summary, the City must collect quarterly sampIes for betalphoton emitters and annual samples for tritium and strontium-90, in addition to the current radionuclide monitoring program for gross alpha particle activity, radium-226, radium-228, and uranium. Quarterly samples must be collected during the same month (first, second or third) of each quarter during each quarter monitored.
Your concern regarding this matter is appreciated. If you have any questions, ptease contact Ms. Shiouiing Chang at (714) 5584707 or myself at (714) 558-4708.
Sincerely,
- A - F y @ w Shu-Fang Orr, P.E.
District Engineer Santa Ana District Enclosures (2)
GC:
Orange County Environmental Health I
I
ENCLOSURE B HYDROGEOLOGIC ASSESSMENT: POTENTIAL IMPACTS TO SAN CLEMENTE GROUNDWATER RESOURCES OF IN RE WELL NO. 6 SYSTEM NO. 3010036 TRITIATED GROUNDWATER AT SONGS -
City of San Clemente Public Works David N. Lund, Public Works & Economic Development Director Phone: (949) 361 -8391 Fax: (949) 361 -8281 LundD @ San-Clemente.org January 11, 2007 Mr. Shu-Fang Orr, PE District Engineer California Department of Health Services 28 Civic Center Plaza, Room 325 Santa Ana, CA 92701
Subject:
Hydrogeologic Assessment: Potential Impacts to San Clemente Groundwater Resources of Tritiated Groundwater at SONGS - In Re Well No. 6 System No. 3010036
Dear Mr. Orr:
Enclosed is a copy of the subject report prepared for the City of San Clemente by James Thurber, Geotechnical Consultants, Inc., Lake Forest, California.
According to Mr. Thurbers findings, the discovery of tritium contaminated groundwater at SONGS Unit 1 does not pose a threat to the City of San Clemente groundwater resources or the municipal well field, including the proposed Well No. 8.
Accordingly, we would respectfully request that you authorize the removal of the Citys Well No. 6 from the list of vulnerable sources to contamination by nuclear facilities.
If you have any questions or require additional information, please contact the undersigned. Thank you in advance for your thoughtful assistance in this matter.
Sincerely, David N. Lund Public Works & Economic Development Director Enclosure C: Noel Hansen, SONGS, Environmental Protection Group Public Works 910 Calle Negocio, Suite 100 San Clernente CA 92673 hlti)://ci.san-clernente.ca.Lis
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NICAL CQ Geotechnical Engineering 0 Geology 0 Hyd Mr. David Lund, Director of Public Works City of San Clemente 91 0 Calle Negocio, Suite 100 San Clemente, CA 92673 January 3,2007 SO6032
SUBJECT:
Hydrogeologic Assessment: Potential Impacts to San Clemente Groundwater Resources of Tritiated Groundwater at SONGS
Dear Mr. Lund,
Geotechnical Consultants, Inc. (GTC) has completed a review of background documents and groundwater quality data provided by Southern California Edison (SCE) related to the discovery of tritium-contaminated groundwater (tritiated groundwater) at the San Onofre Nuclear Generating Station (SONGS). The data review was performed to understand the occurrence of tritiated groundwater, the local hydrogeologic conditions and the potential impacts to the City of San Clemente potable groundwater resources. This assessment was undertaken prior to the planned construction of the City's newest groundwater supply well, Well No. 8. The location of the San Clemente wells, nearby Camp Pendleton supply wells and SONGS are presented in Figure 1 - Well Location Map. GTC attended two meetings with SONGS staff and was provided a tour of the Unit 1 site. In addition, we had regular communication with staff responsible for the routine groundwater monitoring, recent well sampling, data analysis, and reporting.
Background
SCE is in the process of decommissioning Unit 1. Unit 1, the original reactor at the SONGS facility, was first operational in 1968 but has not been used since 1992. During the decommissioning and removal of Unit 1 it was necessary to conduct groundwater dewatering below the foundation of the containment sphere. The extracted groundwater was placed in temporary storage tanks, sampled and tested for tritium. Low levels of tritium were detected during the week of August 7, 2006. Tritium concentrations found in the water ranged from 50,000 to 330,000 picocuries per liter (pCi/L). The extracted groundwater was discharged with other site water in compliance with the facility NRC operating license to the SONGS ocean outfall.
Tritium is a naturally occurring radioactive isotope of hydrogen produced by cosmic radiation in the upper atmosphere. Tritium is also formed during nuclear weapons explosions and testing; the quantity of tritium in the atmosphere from weapons testing peaked in 1963 and has been decreasing since. Tritium readily replaces one of the stable hydrogen atoms in water ( H 2 0 )
to fonn tritiated water. The combined tritium sources introduce it to the environment predominantly as precipitation. Tritium has a half-life of 12.3 years. Radioactive decay of tritium emits a very weak beta particle and transforms to stable (nonradioactive) helium (USEPA).
23072 Lake Center Drive, Suite 212 0 Lake Forest, CA 92630 0 (949) 457-9343
Potential Impacts of Tritiated Groundwater at SONGS Page 2 January 3,2007 Hydrogeologic Setting The SONGS facility is located in the San Onofre hydrologic area directly adjacent to the Pacific Ocean. Building foundations at the Unit 1 reactor and the underlying groundwater occur in the Pliocene San Mateo Formation which consists of marine sandstone with interbeds of gravel and claystone. The local groundwater gradient at SONGS is southwest toward the ocean and experiences tidal influence (SCE, October 2006).
Potable groundwater supplies for USMC Base Camp Pendleton are tapped by wells along San Onofre Creek and San Mateo Creek within the San Onofre and Sail Mateo groundwater basins, respectively. The groundwater basins are comprised of unconsolidated alluvial sand and gravel deposits (valley fill) that overlie the semi-consolidated San Mateo Formation. Based on available well data sheets from four Camp Pendleton wells the alluvial aquifer ranges from 130 to 200 feet in the San Onofre basin about one mile east of SONGS and 200 to 250 feet thick in the San Mateo basin about 2 miles north of SONGS (Figure 1). The two alluvial groundwater basins are separated by a ridge comprised of San Mateo sandstone. Groundwater levels are approximately 20 to 30 feet below grade corresponding to elevation +20 to +40 feet.
Groundwater movement witlun the alluvial basins and the adjacent hillsides comprised of San Mateo Formation is to the west.
City of San Clemente wells are located on the marine terrace and hillside areas that form the northern margin of the San Mateo Creek valley and groundwater basin. Well No. 6 is 937 feet deep and the casing is perforated at two intervals: depth 758 to 767 feet and depth 805 to 842 feet. Well No. 7 was drilled to a depth of 1200 feet but the deepest casing perforations are only 875 feet. Static water levels at Well No. 7 are 240 to 250 feet below ground level or approximately elevation 0 to +10 feet. The existing San Clemente wells (3, 6 and 7) are completed in semi-consolidated sandstone, siltstone, shale and conglomerate of the Capistrano Formation and tap aquifers present at elevation -100 to -600 feet. Proposed Well No. 8 (Figure 1) will replace Well No. 7 and is anticipated to produce water from these deep aquifers.
Groundwater withm the San Clemente well field flows west-southwest and is recharged from the upland areas to the east. There is some speculation that the San Clemente well field is partly recharged by a hydraulic connection to the San Mateo basin.
Groundwater Monitoring Routine Sampling. Routine groundwater monitoring has been conducted by SCE staff since the SONGS Unit 1 became operational in 1968. SCE conducts routine groundwater monitoring as part of a comprehensive environmental monitoring program. Drinking water samples are currently collected monthly from two indicator sources and one control source. The two indicator samples are obtained from distinct groundwater sources: a City of San Clemente well or a reservoir within the San Onofre Housing area on Camp Pendleton which is supplied by I
Potential Impacts of Tritiated Groundwater at SONGS Page 3 January 3,2007 groundwater wells within San Mateo basin. The one control location is outside the influence of SONGS and is a municipal drinking water source (downtown City of Oceanside). City of San Clemente Well No. 6 was routinely sampled and tested as the nearest groundwater source until 1997 when SCE concluded there was no credible expectation for any groundwater contamination from SONGS to reach this location. Since 1997 SCE has sampled the Camp Pendleton reservoir as an indirect sample of the San Mateo basin groundwater. Every sample is analyzed for tritium, gross beta, and another 28 gamma emitting radionuclides.
Tritium has not been detected in any groundwater sample above a lower level of detection since the monitoring program was initiated in 1968.
Non-Routine Sampling. Following the August 2006 discovery of tritiated groundwater at SONGS, SCE staff collected five additional groundwater samples from area wells. In October 2006 samples were collected froin San Clemente Well No. 6, two wells in San Mateo basin (Well Nos. 6151 1 and 61521) and two wells in San Onofre basin (Well Nos. 52023 and 52028)
(see Figure 1). These wellhead samples provide representative groundwater samples and water quality testing for each individual well to characterize local groundwater quality. These wellhead samples are not a blend of more tlian one source as the routine reservoir samples have been and remove any concern about blending or dilution of the tritium concentration.
Tritium was not detected in any of these five groundwater samples. Copies of the laboratory test reports provided by SCE are attached.
Conclusions The discovery of tritium contaminated groundwater at SONGS Unit 1 does not pose a threat to the City of San Clemente groundwater resources or the municipal well field, including the proposed Well No. 8. This conclusion is supported by the local groundwater gradient, differing hydrogeologic setting and horizontal separation of the contaminant source from the Citys wells, and the historic and recent groundwater quality testing. The tritium impacted groundwater at SONGS flows southwest a short distance to the Pacific Ocean. All of the area supply wells at Camp Pendleton and Sari Clemente are upgradient of the SONGS facility. No well sample has detected tritium in the groundwater at these upgradient locations. In addition, the City of San Clemente well field is separated from SONGS by two shallow alluvial groundwater basins and is located 3 miles from potential contamination sources at SONGS. San Clemente wells, including the proposed Well No. 8, extract groundwater from deep aquifers within the Capistrano Formation which has limited hydraulic connection with the shallow alluvial and semi-consolidated San Mateo Formation aquifers. Finally, in the remote chance that tritiated groundwater was drawn toward an upgradient pumping well it would reach one of the Camp Pendleton wells first.
Potential Impacts of Tritiated Groundwater at SONGS Page 4 January 3,2007 Recommendations Although there is a very low risk of tritiated groundwater from SONGS impacting the City of San Clemente well field, the results of SCEs routine environmental monitoring and reporting should be periodically reviewed by the City. The annual Radiological Environmental Operating Report is published in April each year and SCE should provide a copy to the City. In addition, as SCE did in August 2006, unusual findings of contaminated groundwater should be reported immediately to the City of San Clemente. As an additional precaution, we recomrnend that the City of San Clemente request SCE collect annual wellhead samples from one Camp Pendleton well in San Onofre and San Mateo basins, and one sample from City Well No. 6.
These samples should be tested for tritium and the complete suite of radionuclides, and the results forwarded to the City. Finally, SCE indicated they are planning to conduct a hydrogeologic and groundwater quality assessment of the entire SONGS facility (Units 1, 2 and 3). The results of this study should be provided to the City of San Clemente.
We are pleased to assist the City of San Clemente with this hydrogeologic assessment and evaluate the potential for tritium contamination of the Citys groundwater resources. Please contact us if you have any questions or require additional work.
Sincerely, Geotechnical Consultants, Inc.
James Thurber, C.HG. 162
/
Attachments :
0 Figure 1 -Well Location Map 0 October 2006 Laboratory Test Reports (Camp Pendleton Wells 52023, 52028, 6151 1 and 61521, and San Clemente Well No. 6)
Potential Impacts of Tritiated Groundwater at SONGS Page 5 January 3,2007 References Southern California Edison (SCE), April 2006, 2005 Radiological Environmental Operating Report, San Onofre Nuclear Generating Station, Units 1, 2 and 3.
SCE, October 2, 2006, Hydrogeologic Review, San Onofre Nuclear Generation Station, San Diego County, California, letter report by David Van Horsen, CEG and Zaid Ahmad, PE.
U.S. Environmental Protection Agency (USEPA), Tritium: The Basics, web site:
li~p://www.epa.~ov/radiation/radionuclides/tritiuln.l~tm, accessed September 2006.
GEOTECHNICAL CONSULTANTS, INC.
23072 Lake Center Drive, Suite 212 Lake Forest, CA 926%
0 Camp Pendleton Well 52023 0
Camp Pendleton Well 52028 0
Camp Pendleton Well 61 5 1 1 0
Camp Pendleton Well 61521 e
City of San Clemente Well No. 6 e
Camp Pendleton - San Onofie Housing Area Reservoir I
LABORATORY TEST REPORTS
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Environmental Laboratory Analysis Report 29 Research Drive AREVA Customer Southern California Edison Co Attention Noel A. Hansen Sample Matrix Drinking Water Lab. Sample No. L11616-04 Client ID 61521 AREA 61 Reference Date 10/27/06 Analysis Date 11/09/06 Westboro, MA 01581 508-573-6650 Southern California Edison Co San Onofre Nuclear Generating Statlon San Clemente, CA 92674-0128 Report Date 11/13/06 Receipt Date 11/01/06 PO Box 128 (W-44)
Product GAMMA SPECTROMETRY Table Monthly Drinking Water Activity Concentration TPU Measured Required Nuclide
+/- 2 -Sigma 1 Sigma MDC MDC Flags
( P C W
( P C W
( P C W
( P C W AcTh-228 Ag-lO8m Ag-1 1 Om Ba-I40 Be-7 Ce-I41 Ce-144 CO-57 CO-58 co-60 Cr-51 cs-134 cs-I37 Fe-59 1-131 K-40 La-140 Mn-54 Nb-95 Ru-103 RU-I06 Sb-124 Sb-125 Se-75 Zn-65 Zr-95 1E+01 +/- 1.3E+01 I.lE+OO +I-2.3E+00 7E-01 +/- 4,5E+00 4.6E+00
+I-5.9E+00 3E+01 +I-2,6E+01 BE-01
+/- 4,9E+00 3E+00 +/- 1.5E+01
-1.9E+00 +I-1,9E+00 4E-01
+I-3.1E+OO
-4E-01
+I-4.OE+00
-1.4E+01
+/- 3.1E+01
-1,7E+00 +/- 3,OE+00 8E-01
+/- 3.3E+00
-3.lE+OO +I-7.1E+00 6E-01 +/- 6.4E+00
-2.9E+01 +/- 4,8E+01 5.3E+00 +/- 6.7E+00 1E+00 +I-2,9E+00 2.6E+00 +I-3.6E+00
-1.5E+OO +I-3.3E+00
-8E+00 +/- 3,OE+01
-1.4E+OO +I-8.3E+OO OE+OO +I-7.5E+OD 5E-01
+I-3.7E+OO
-1,3E+OO +/- 6,l E+OO
-1E-01 +I-4.9E+00 6.4E+00 1.2E+00 2.2E+OO 2,9E+00 1.3E+01 2.5E+OO 7.7E+00 9.7E-01 1.5E+00 Z.OE+OO 1.6E+01 1.5E+00 1.7E+00 3.6E+00 4.2E+00 2.4E+01 3.4E+00 1.5E+00 1.8E+00 1.6E+OO 1.5E+01 4.2E+00 3.8E+OO 1.8E+00 3.1 E+OO 2.4E+00 Flags: a The measured MDC Is greater than the required MDC b The activity concentration Is greater than the measured MDC.
c Peak was found Reporting Level Ratio:
C:
2.1 E+01 4,OE+00 7.9E+00 9.6E+OO 4.1E+01 8.4E+00 2.6E+01 3.5E+00 5,5E+00 7.2E+00 5.6E+01 5.8E+00 5.8E+OO 1,3E+01 1.5E+01 8.9E+01 l.lE+Ol 5.1 E+OO 5.9E+00 6.OE+00 5.5E+01 1.6E+01 1.3E+01 6,3E+00 1.2E+01 8.9E+00 Approved by
@l&&A&
LilIflOb i d.M. Moreno dM. Moreno Sample Control & Measurements Supervisor Page 1 of 1 Results are only applicable to the sample a s received at the laboratory. Report should not be reproduced unless in its entirety.
AREVA Customer Southern California Edison Co Attention Noel A. Hansen Sample Matrlx Drinking Water Envlronrnental Laboratory Analysis Report 29 Research Drive Westboro, MA 01581 508-573-6650 Southern California Edison Co Report Date 11/09/06 San Onofre Nuclear Generating Station Receipt Date 11/01/06 PO Box 128 (W-44)
San Clemente, CA 926740128 Lab. Sample No. L11818-03 Client ID 61 51 1 AREA 61 Reference Date 10/27/06 Analysis Date 11/08/06 Product GAMMA SPECTROMETRY Table Monthly Drinking Water Activity Concentration TPU Measured Required Nucllde
+I-2 -Sigma 1 Sigma MDC MDC Flags (pCilL)
(PCW (PCW (PCW AcTh-228 Ag-lO8m Ag-1 I Om Ba-140 Be-7 CS-141 Ce-144 cc-57 co-58 Co-60 Cr-51 cs-134 CS-137 Fa-59 1-131 K4O La-140 Mn-54 Nb-95 Ru-1 03 Ru-106 Sb124 Sb125 32-75 211-65 Zr-95 8E+M +I-1.3E+01 1E+00 +/- 3.2E+OO IE+OO +I-4.7E+00
-1.4E+00 +/- 5.5E+00
-3E+00 +/- 3.OE+01
-2,4E+OO +/- 5.2E+00
-9E+OO +/- 1.7E+Ol 9E-01
+/- 2.1E+00 2E+00 +/- 3.5E+OO 2.1E+00 +I-4.4E+00 7E+00 +/- 3.3E+01 2.7E+00 +/- 3.9E+00
-1.9E+00 +/- 3.8E+00 3.6E+00 +/- 7.8E+00 3.7E+00 +/- 8.OE+00 1.1E+01 +I-5.OE+01
-1.6E+00 +/- 6.3E+00
-9E-01
+/- 3,7E+OO l.IE+OO +/- 4.1E+OO
-1.5E+00 +/- 3.5E+OO 3,3E+01 +/- 3.5E+01 OE+OO +/- 1.OE+01 6.6E+00 +/- 8.8E+00 2.9E+00
+/- 3.6E+OO 1.8E+00 +/- B.OE+OO
-3E+00 +/- 5.4E+00 8.5E+OO 1.6E+00 2.4E+00 2.8E+00 1.5E+01 2.6E+00 8.5E+00 1.OE+OO 1.8E+OO 2.2E+00 1.7E+01 1.9E+00 1.9E+00 3.9E+00 4.OE+00 2.5E+01 3.2E+00 1.8E+00 2.1 E+OO 1.BE+Ol 1.7E90 5.2E+00 4.4E+00 1.8E+00 4.OE+00 2.7E+00 Flags: a The measured MDC Is greater than the required MDC b The activity concentration Is greater than the measured MDC.
c Peak was found Reporting Level Ratio:
2.2E+01 5.5EtOO 8.5E+00 1.1E+01 5.4E+01 9.3E+00 3.5E+M 6.OE+00 7.6E+00 5.8E+01 6.5E+00 7,2E+00 1.4E+01 1.4E+01 8.9 E+O 1 1.3E+01 6.8E+00 7.3E+00 6.5E+00 5.6E+O1 2.OE+01 1.5E+01 5.9E+00 1.4E+01 l.IE+Ol 3.OE+01 1.5E+01 Amroved by
\\J -c;h/ E.M. Moreno Sample Control B Measurements Supervisor C:
Page 1 of I Results are only applicable to the sample as received at the laboratory. Report should not be reproduced unless in its entirety.
AREVA Customer Southern California Edison Co Attention Noel A. Hansen Sample Matrix Drinklng Water Environmental Laboratory Analysis Report 29 Research Drive Westboro, MA 01581 508-573-6650 Report Date 11/09/06 Southern.California Edlson Co San Onofre Nuclear Generating Station Receipt Date 11/01/06 PO Box 128 (W-44)
San Clemente, CA 92674-0128 Lab. Sample No.
L11616-OZ Client ID 52028 CAMP PEN. AREA 52 Product GAMMA SPECTROMETRY Reference Date 1 0127108 Analysts Date 11/08/06 Table Monthly Drinking Water Activlty Concentration TPU Measured Requlred
( P C V (pCi/L)
(PCI/L)
(pCilL)
Nuclide
+I-2 -Sigma 1 Slgma MDC MDC Flags AcTh-228 Ag-lO8m Ag-11 Om B8-140 Be-7 Ce-141 3-144 co-57 CO-58 co-60 Cr-51 cs-134 cs-137 Fe-59 1-1 31 K-40 La-140 Mn-54 Nb-95 Ru-103 RU-106 Sb-124 Sb-125 se-75 211-65 Zr-95 3E+00
-4E-01
-8E-01 3.5E+00
-3.4E+01
-8.9E+00
-1.8E+O1
-6E-01
-2.4E+00
-1 E+OO 8E+00
-1 E+OO 1.7E+00
-4,8E+OO
-7E-01 1.8E+01 4E+00
-4E-01 2.5E+00
-4E-01
-2E+OO 6.9E+00 2.5E+OO
-3.3E+00
-7.6E+00 9E-0 1
+/- 1.3E+01
+I-2.8E+OO
+/- 4.4E+00
+/- 6.9E+00
+/- 2.8E+01
+I-7.4E+00
+/- 1.4E+01
+/- 1.8E+00
+/- 3.9E+00
+I-2.7E+00
+/- 2.8E+01
+/- 4.3E+OO
+/- 3.1E+00
+I-7.6E+00
+I-7.3E+00
+/- 5.OEt01
+I-8.OE+OO
+/- 3.3ECOO
+/- 3.9E+00
+/- 3,8E+OO
+I-3.1E+01
+I-9.OE+00
+/- 8.4E+00
+/- 3.7E+00
+/- B.OE+OO
+/- 6.5E+00 6.5E+00 1.4E+OO 2.2E+00 3.5E+00 1.4E+01 3.7E+00 7.2E+00 9.0 E-0 1 1.9E+00 1.4E+00 1.4E+01 2.2E+00 1.5E+00 3.8E+00 3.6E+OO 2.5E+01 4.OE+00 1.7E+00 2.OE+00 1.9E+00 1.6E+01 4.5E+00 4.2E+00 1.9E+00 4.OE+00 3.2E+00 Flags: a The measured MDC Is greater than the requltad MDC b The actlvlty concentratlon Is greater than the measured MDC.
c Peak was found Reporting Level Ratlo:
2.3E+01 5.1 E+OO 8.3E+OO 1.2E+01 5.5E+01 1.4E+OI 2.7 E+O1 3.ZE+00 7.5E+OO 5.8E+00 4.8E+01 8.OE+00 5.3E+00 1.5E+01 1.3E+01 8.8+01 1.4E+01 6.2E+00 6.6E+00 6.9E+OO 5.6E+01 1.5E+01 1.5E+01 6.9E+OO 1.2E+01 1.7E+01 Appgved by E.M. Moreno Sample Control 8. Measurements Supervisor Page 1 of 1 Resulls are only applicable to the sample as received at the laboratory. Report should not be reproduced unless In its entlrety.
AREVA Customer Southern California Edison Co Attention NoelA. Hansen Sample Matrix Drinking Water Environmental Laboratory Analysis Report 29 Research Drive Westboro, MA 01581 508-573-6650 Report Date 11/09/06 Southern California Edison Co San Onofre Nuclear Generating Station Receipt Date 11/01/06 PO Box 128 (W-44)
San Clemente, CA 92674-0128 Lab. Sample No.
L11616-01 Client ID 52023 CAMP PEN. AREA 52 Product GAMMA SPECTROMETRY Reference Date 10/27/06 Analysis Date 11/08/06 Table Monthly Drinking Water Actlvlty Concentration TPU Measured Required Nuclide
+I-2 -Sigma I
Sigma MDC MDC Flags (PCW (pCi/L)
(PCW (PCIIL)
AcTh-228 Apl08m Ag-11 Om Ea-140 Be-7 Ce-I41 Ce-144
'20-57 co-58 co-60 Cr-51 cs-I34 Cs-137 Fe-59 1-131 K-40 La-140 Mn-54 Nb95 Ru-103 Ru-I06 Sb-124 Sb-125 se-75 Zn-65 Zr-95 2E+00 2.7E+00 3E-01
-1 E+OO
-2.2E+01
-1.6E+00 OE+OO 5E-01
-3.7+00 1.5E+OO OE+OO
-2E+OO 9E-01 4.2E+OO
-3.6E+OO
-1.2E+01
-1.2E+00 3.2E+00 OE+OO
-1.2E+00 3E+00 8.8E+00 3.4E+OO
-5E-01
-6.3E+00
-4.3E+00
+I-1.7E+01
+/- 2.4E+00
+/- 4.6E+00
+I-6.6E+OO
+/- 2.7E+01
+I-4.5E+OO
+/- 1.6E+01
+/- 2.2E+00
+I-3.1E+OO
+/- 3.6E+00
+/- 3.1E+01
+/- 3.2E+00
+I-3.1E+W
+/- 6.5E+00
+/- 7.3E+00
+/- 4.7+01
+I-7.6E+OO
+I-3.OE+00
+/- 3.3E+00
+I-3,2E+OO
+/- 3.OE+01
+/- 7.8E+00
+/- 7.2E+00
+/- 4,1E+00
+I-7.5E+00
+I-4.7E+OO Flags: a The measured MDC is greater than the required MDC b The actlvlty concentratlon Is greater than the measured MDC.
c Peak was found A
ApprKved by Reportlng Level Ratio:
C:
E.M. Moreno Sample Control & Measurements Supervisor Page 1 of 1 Results are only applicable to the sample as received at the laboratory. Report should not be reproduced unless in its entirety.
~
i I
i i
i i
I
u
~
Environmental Laboratory AnalysTs Reporf 29 Research Drive Westborn, MA 01581 508473.6650 Customer Soulhem California Edison Co Attentlon Noel A. Hansen Sample Maw DdnWng Water Report Date 11/07/1)6 Southern California Edison Co San Onofre Nudear Generating Station PO BOX 128 (W-44)
San Clemente, CA 92674-0128 Recelpt Date lo11 9/06 Lab. Sample No.
L11551-03 Cllont ID 05 OCEANSIDE CONTROL Product GAMMA SPECTROMETRY Reference Date 1Wl7106 Analysts Date lODoloG Table Monthly Drinking Water Acthity Concentration TPU Measured Required Nuclide
+/.
2 -Sigma 7 Sigma MDC MDC Flags (PCW (PCIN (PCW
( P C W AcTh228
~ g. 1 oam Ag-11th Ba-140 6.3-7 Ce-142 Ce-144 co-57 CO-58 Co-60 Cr-51 CS-134 cs-137 Fe-59 1-131 K 4 La-1 40 Mn-54 Nb-95 RU-103 RU-I06 Sb-124 Sb-125 se75 Zn-65 Zr-95 9E-01
+I-9.8E+OO 9E-01 +I-2.1E.I.00 1.4E+OO +I-3.4E+lM
-3.3E+00
+I-6.3E+OO 1.3E+Ol
+I-2.2E+Oi
-3.7E.tOO
+f-4.DE+OO
-5E+OO +I-I.IE+OI 3E-01 +/- 1.4E+00
-4.IE+00 4-3.0EtOO 2.6H00 +/- 2.9E+00 1.1Ei.01 +I-2.3E+01
~ E - O I. +r-Z.~E+OO
-2.2E+00 +I-2.5EtOO
-1.9E+OO- +/- 6.7E+00
-2.6EtOB
+I-5.9EtOO
-1E+OI ti-3.5E+01
-3,8E+OO +I-7,2E+00
-1.5E+OO
+I-26Et00
-1.1Et00 +/- 3.4E+00
-2,7E+OO tl-2,8E+OO
-2,4E+01 +I-2.2E+01 2.5E+OO
+I-7.3E+00
-1.3E+OO
+I-6.9E+00 2E-01
+I-2.8E+00 4E#0 +I-5.5E+OO
-1E-01 +/- 5.2E+00 4,9E+OO l.IE+OO 1.7E+00 3.1 E+OO 1.1 E+Oi 2.OE.I.00 5.4E+00 6.8E-01 1.5E+00 1,5E+OO 1.2E+OI 1.4Ei00 1.3E+00 3.3EMO 3.OEtOO 1.8E+01 3.6E+00 1.3Et00 1.7E+00 1.5E+00 I.IE+OI 3.6E+00 3.5E.tO0 1,4E+OO 2.7E+OD 2.6EtOO Flags: a The measured MDG Is greater than the required MDC b The activity concentration Is greater than the measured MDC.
c Peak was found Reporting Level Ratio:
t:
1.8E+01 3.6E+OO 5.8EtOO 1.2Ei-01 3.7E+01
- 7. f E+OD 1.9E+01 2.3E+OO 6.0E+OO 4.8E+OO 3.9E+01 5.1 E+OO 4.9E+00 1.2E+01 1.1 E+01 6.5Et01 1.4E+01 5.OE+00 6.2E+OO 5,5E+OO 4,3E+01 1.3E+OI 1.2E+01 4.8E+OO 1.1E+Ol 9.4E+OO a
1.5E.1.01 I
SE4-01 1.5Et01 1.5E+01 I.5E+01 1.5E+01 3.OE+OI 1.5Et01 i
8 Appl_oved by
'LJ & E.M.Momno Sample Control & Measuremenls Supervisor Page I of I Results are only applicable to the sample as recelved at the laboratory. Report should not be reproduced unless In its entlrety.
AREVA Customer Southern Califomla Edison Co Attention Noel A. Hansen Sample Matrix Drinking Water Environmental Laboratory Analysis Report 29 Research Drive Westboro, MA 01581 508-5736650 Report Date 11/07H)6 Southern California Edlson Co San Onofre Nuclear Generating Station Receipt Date 10/19/06 PO Box 128 (w-44)
San Glemente, CA 926744128 Lab, Sample No.
Li1551-02 Client ID 04 CAMP PENDLETON LOCAL Product GAMMA SPECROMETRY Reference Date 10117106 Analysis Date 10/30/06 Table Monthly Drinking Waler A~7h-228 Ag-iOBm Be-140 Be-7 Ge-141 Ce-144 co-67 Go-58 Co-60 cr-SI cs-134 C8-137 Ag-I 1 Om Fe-59 1-131 K-40 La-140 Mn-54 Nb95 Ru-1 03 Ru-106 Sb.124 Sb-125 Se-75 211-65 2-95
-3.7E+OO +/- 9.3E+OO 3E-01 +I-2.OE+OO
-l.lE+OO +/- 3.OE+DO 3E-01 +/- 5.4POO BE+OO +/- 2.1E+O1
-1.7E.t.00
+/- J.EE+OD
-EE+OO
+/- 1,2E+01 8E-01 +/- 1.6EtOO
-6E41 +/. 24E+OO
-BE-01
+I-2.7E+OO 9E+OO
+/- 23E+OI IE-01 +/- 2,5E+00 6E-01 +I-2.5E+00 1.6E+00 +/- 5.2EtDD
-2.1E+OO
+I-6.7+00 2.2E+01
+/- 3.7ENI 4E-01 +/- 6.2E+00
-1E+00 +I-2.5E+00 9E-01 +I-2.6E+M3
-2E+00 +/- 2.7E+WJ
-1.4E+O1 +/- 2.4EW
- 2.8E+00 +I-7,1E+OO
-Z.IE+OO
+I* 6.1 +DO BE-01 +/- Z.DE+OO 3,4E+00 +/- 5.6E300
-1.1E+00 +I-4.1E300 4.6E+00 9.9E-01 I.SE+OD 2,7E+OO 1.OE+D1 1.9E+DO 6.1 E+OO 8.OE-01 1.2E+00 1,3E+OO 1-1 E+O1 1.3E+00 1.3EeOO 2.6E+OO 3.4E+00 I
,9E+01 3-1 E+OO j.3E+00 1.3E+00 1.4E+OO 1,2E+OI 3.6E+OO 3.1 E+OO 1.5E+OO 2.8E+OD 2.OE+00 Actlvlty Concgntjatlon TPU Measured Required Nuclide
+/- 2 -Slgrna 1 Sigma MDC MDC Flags
( P C W (PCIlJ-1 IPCYL)
( P C W 1,7E+Oi 3,5E+OO 5,6E+OO 9.7E+DO 1.5E+01 3,5EiOI 6.7E+OO 2.1 E+D1 2.7EH30 4.3E+OO 1.5E+01 5.OE+OO l.SE-t.01 3.9E+01 4,5E+DO I.5E+01 4.3E+00 1.8E+D1 9.1 E+OO 3.OE+01 I.ZE+Ol 1.5E+01 6.3E+01 1.1 E+O1 1.5E+01 4.6EiW 1.5E+01 4.6E+M3 I.SE+Ol 5,OE+00 4,4E+01 1.4E+01 1.1 E+O1 4.9E+OO 9.5BOO 3,OE+OI 7.4E+00 i.5E+01 Rags: a The measured MDC Is greater than the required MDC b The activity concentration Is greater than the measured MDC.
c Peak was found Reporting Level Ratlo; C:
ApproAed by
, 'J yd;4t E.M.Moreno Sample Conlrol & Measurements Supervisor Page 1 of 7 Results are only applicable to the sample as received aL lhe laboratory. Report should not be reproduced unles5 in if5 entirely.
AREVA Customer Souulern California Edison Co AttenUon Noel A, Hansen Sample Matrix Drinking Water
.Environmental.LaboratoryAnaly.sls Repori 29 Research Drive Westboro, MA 01581 508-573-6650 Southern Callfomla Edlson Co PO Box 128 DN-44)
Repart Date 11/07/06 San Onofre Nuclear Generatins Stallon Receipt Date 1011 91D6 San Clemsnte, CA 926744128 Lab. Sampls No.
L11551-01 Client ID 02 SAN CEMENlE GOLF CO Product GAMMA SPECTROMETRY Reference Date 10/17/06 Analysia Dab3 10/27/1)6 Table Monthly Drinking Water Activity Concentratibn TPU Measured Requlred Nuclide
+/- 2 -sigma 1 Sigma MDC MDC Flags
( P C W (pCilL)
(!Sill-)
( P C V Acm-228 Ag-IDBm Pg-llom Ba-140 Be-7 Ce-141 ce-144 Co-57 Co-58 Cod0 Cr-51 cs-134 CS-137 Fe-59 1-131 K-40 La-140 Mn-54.
Nb-95 Ru-I03 RU-I 06 Sb-124 Sb-I25 Se-75 211-65 Zr-98 1.15E+01 +/- 5.8E+QO
-5E-01 +/- 1.3E+OO 9E-01 +I-2.3EtOO
-1.7E.COO 41-3.1EtOO
-3E+00 t/- 1,4E+Ol 1.6E+00 +/- 2.3EtOO 4,3E+00 +/- 8.3E+DO
-1E+OO t/- 1.1Et00
-8E-01 +I-1.9E+00
-2.5EtOO
+I-2.5EtOO 2E+OO +/- 1,4E+01
-2E-01 +I-1.9E+OO 4E-01 +/- 1.7E+00
-1.2E+00 t/- 3,9E+OO 6E-01 +/- 3.3E+00
-3E+00
+/- 3.1E401
-l.gE+OO
+I-3,6E+00
-4E-01 +/- $.8E+00 8E-01 +I-P.IE+OO 5E-01 +I-1.8EMO
-6E+OO +/- 1.4EtO1 4E-01
+/- 4.4E+00
-1.6E+00
+/- 4.4EtDO 4E-01 +/- 1,7E+OO
-2.5E+00 +I-3.9E+00
-1.8E+OO +/- 3,2E+OO 2.9E+OO 6.7E-01 1,I E+oo I
.6E+00 6.9Et00 1.2Et00 4.2E+OO 5.5E-01 932-01 1.2Et00 7.OE+OO 9.6E-01 8.5E-01 Z.OE+oD 1.6E+00 1.6E301 1.8EtOO 8.8E-01 1.OE+OO Q.2E-01 7.3E+00 2.2E+00 2.2E+oo 8.6E-01 2.OEi00 1.6EtOO Flags: a The measured MDC is greater than the requlred MDC b The actlvlty concentration is greater than the measured MDC.
c Peak was found Roportlng Level Ratio:
C:
bc 1.5E+01 1.5E+01 1.JEW 3.OE#1 1.5E#1 1.5EtOI 1,5E+01 1.5Et01 L
AppRvad by Sample Control & Measuremenls Supervisor Page 1 Of 1 Results are onfy applicable to the sample as recehred at tha laboratory. Report should not be reproduced unless in its entirely.
ENCLOSURE C VULNERABILITY ASSESSMENT AND RADIONUCLIDE MONITORING REQUIREMENTS FOR WELL 6 SYSTEM NO. 3010036
2 California Department of Health Services SANDRA SHEWRY Director State of California-Health and Human Services Agency Department of Health Services ARNOLD SCHWARZENEGGER Governor Q$5e
.P. *Q
%p January 22,2007 Mr. David N. Lund Public Works & Economic Development Director City of San Clemente 910 Calle Negocio, Suite 100 San Clemente, CA 92673
Dear Mr. Lund:
VULNERABILITY ASSESSMENT AND RADIONUCLIDE MONITORING REQUIREMENTS FOR WELL 6, SYSTEM NO. 3010036 This is in response to your letter dated January 11, 2007, requesting the removal of the Citys Well 6 from the list of vulnerable sources to contamination by nuclear facilities. We received the letter and a copy of the report entitled Hydrogeologic Assessment: Potential Impacts to San Clemente Groundwater Resources of Tritiated Groundwater at SONGS on January 16,2007.
In mid-August 2006, the retired reactor at San Onofre Nuclear Generating Station (SONGS) was found to have leaked several thousand gallons of radioactive water containing tritium over an unknown period of time. The initial tests showed tritium concentration in groundwater beneath the retired reactor was higher than the drinking water standard. But it was lower than the maximum annual leakage permitted for nuclear power plants by the Nuclear Regulatory Commission.
The Citys Well 6 is located approximately three miles away from the SONGS. Upon learning the news on August 16, 2006, the City collected groundwater samples from Well 6 for radionuclide analysis. On August 22, 2006, the Department received the laboratory report containing tritium,-alpha, beta, uranium, and radon analysis results via facsimile. A review of the laboratory report indicated that tritium and uranium concentrations in Well 6 were below their respective DLRs (1,000 pCilL for tritium and 1 pCi/L for uranium). In addition, alpha, beta and radon concentrations in this well were relatively low. It appeared that Well 6 had not been adversely affected by the leak at that time. In addition to collecting samples from Well 6, the City also contracted Geotechnical Consultants, Inc.
(GTC) to study the geology and hydrology of the area and the relation between the groundwater aquifer where Well 6 withdraws its water from and the groundwater aquifer beneath the San Onofre Nuclear Power Plant. As a precaution, the Department placed the Do your part to help California save energy. To learn more about saving energy, visit the following web site:
www.consumerenerqvcenter.orq/flex/index.html Southern California Drinking Water Field Operations Branch, Santa Ana District 28 Civic Center Plaza, Room 325, Santa Ana, CA, 92701 Internet Address: www.dhs.ca.qov/ps/ddwem/
Telephone: (714) 558-441 0 Fax: (71 4) 567-7262
Mr. David N. Lund January 22,2007 Page 3 Mr. Andrew J. Howard, Utilities Manager City of San Clemente 380 Avenida Pico, Building N San Clemente, CA 92672
NOTE: Thispublicofion is meant IO be an aid to the stalfof the CDHS Drinking Water Program and cannot be relied upon by the regulated commutiity as the State of Californias representation of the Imv. The published codes are the only oficial representation of the law. Re$. to the published codes whenever specijic citations are required.
Radionuclide MCL Rad ium-226 5 pCi/L (combined Radium-228 radium-226 & -228)
Gross Alpha particle activity (excluding 15 pCiL radon and uranium)
Uranium 20 pCik Article 4.5. Trihalomethanes 364439. Requirements.
Community water systems shall comply with the National Interim Primary Drinking Water Regulations for the control of Trihalomethanes in Drinking Water, Sections 141.2(p), (q), (r), (s) and (t), 141.6, 141.12 and 141.30 of Title 40, Code of Federal Regulations, as published in the November 29, 1979, Federal Register (Vol. 44, No. 231) and revised in the March 11, 1980, Federal Register (Vol. 45, No. 49), the December 16, 1998, Federal Register (Vol. 63, No. 241) and the January 16,2001, Federal Register (Vol. 66, No. 10).
DLR 1 pCi/L 1 pCi/L 3 pCi/L 1 pCi/L
. Article 5. Radioactivity 864442. MCLs and Monitoring - Gross Alpha Particle Activity, Radium-226, Radium-228, and Uranium (a) Each community and nontransient-noncommunity water system (system) shall comply with the primary MCLs in Table 64442 in the drinking water supplied to the public and use the DLRs for reporting monitoring results:
Table 64442 Radionuclide Maximum Contaminant Levels (MCLs) and Detection Levels for Purposes of Reporting (DLRs)
(b) Each system shall monitor to determine compliance with the MCLs in table 64442, as fo I10 ws :
representative of all sources being used under normal operating conditions; conduct all monitoring at the same sample site(s) unless a change is approved by the Department, based on a review of the system and its historical water quality data; each quarter during each quarter monitored; quarterly samples at each sampling site for each radionuclide in table 64442, except that nontransient-noncommunity water systems shall not be required to monitor radium-228 as a separate analyte, but shall monitor for compliance with the combined radium MCL using the analytical method described in Prescribed Procedures or Measurement of Radioactivity in Drinking Water, Section 6, Alpha-emitting Radium Isotopes in Drinking Water, Method 903.0 (1) Monitor at each water source, or every entry point to the distribution system that is (2) For quarterly monitoring, monitor during the same month (first, second or third) of (3) By December 3 1, 2007, complete initial monitoring that consists of four consecutive (EPA/600/4-80-032, August 1980):
92 July 2006-fiom Title 22 California Code of Regulations Califorriia Safe Drinking Water Act & Related Laws and Regulalionr
NOTE: This pirblicaiion is meant io be an aid to ihe staff of ihe CDHS Drinking Water Program and cannoi be relied upon by the regulated commimity as the State of California's representation of the law. The published codes are the only oflcial represeniaiion of the law. Refer io the published codes whenever specijk citations are required (1) For a system monitoring less than quarterly, quarterly samples shall be collected and (2) For a system that already has four consecutive quarterly results, compliance shall be (3) The system shall monitor quarterly until the results of four consecutive quarterly analyzed to determine compliance, pursuant to subsection (h);
determined pursuant to subsection (h).
sample results do not exceed the MCL.
(h) A system with one or more sample results greater than an MCL shall determine compliance with the MCL as follows:
(1) At each sampling site, based on the analytical results for that site. Any confirmation sample result shall be averaged with the initial result.
(2) Using all monitoring results collected under this section during the previous 12 months, even if more than the minimum required number of samples was collected.
(3) By a running annual average of four consecutive quarters of sampling results.
Averages shall be rounded to the same number of significant figures as the MCL for which compliance is being determined.
the MCL, the system shall be out of compliance immediately upon receiving the result; be determined by the average of the samples collected at the site during the most recent 12 months; and calculate the annual average, unless a gross alpha particle activity is being used in lieu of radium-226, total radium, and/or uranium. In that case, if the gross alpha particle activity result is less than the DLR, !h the DLR shall be used to calculate the annual average.
consecutive quarterly samples.
analytical errors, the Department may invalidate the result based on its review of the documentation, the sampling result, and the historical sampling data.
(6) Each system shall ensure that the laboratory analyzing its samples collected for compliance with this article calculates and reports the sample-specific Minimum Detectable Activity at the 95% confidence level (MDA95) along with the sample results. The MDA95 shall not exceed the DLR and shall be calculated as described in ANSI N42.23 Measurement and Associated Instrumentation Quality Assurance for Radiobioassay Laboratories, Appendix A.7.6 (September 10, 1995).
(A) If any sample result will cause the annual average at any sample site to exceed (B) If a system has not analyzed the required number of samples, compliance shall (C) If a sample result is less than the DLR in table 64442, zero shall be used to (4) If compositing is allowed at a sampling site, by the results of a composite of four (5) If the system can provide documentation that a sample was subject to sampling or July 2006-from Title 22 California Code of Regulations Calijornia Safe Drinking Water Ac! R. Related Laws and Regulations 94
ENCLOSURED WELL NO 6 INFLUENCE AREA STUDY
WELL NO. 6 INFLUENCE AREA STUDY Prepared for:
City of San Clemente 91 0 Calle Negocio San Clemente, California 92672 Prepared by:
AKM Consulting Engineers 553 Wald Irvine, CA 92618 (949) 753 - 7333 November 2006
TABLE OF CONTENTS Section Page I
INTRODUCTION....................................................................................................................................
1 II PURPOSE..............................................................................................................................................
1 Ill STUDY AREA.........................................................................................................................................
1 IV EXISTING SYSTEM...............................................................................................................................
2 V
WATER SUPPLY................................................................................................................................... 2 VI WATER USE.......................................................................................................................................... 6 VI1 MODEL ANALYSIS................................................................................................................................ 6 LIST OF TABLES Table No.
Pa_qe 1
2 3
Water Supply Analysis............................................................................................................................ 4 Nodes Affected by Well No. 6................................................................................................................
8 Distribution of Flow.................................................................................................................................
7 LISP OF FIGURES Fiqure No.
PaWe 1
2 3
4 5
Existing Water System...........................................................................................................................
3 Hourly Turnout Flows.............................................................................................................................
4 Reservoir 1 Depth Versus Time.............................................................................................................
5 1-295 Service Zone Demand Curve.......................................................................................................
6 Well No. 6 Influence Area Map..............................................................................................
Map Pocket TOC-i Well No. 6 Influence Area Study K:\\.San Clernenle. City OnGroundwaler AginglReporl
SAN CLEMENT WELL NO. 6 INFLUENCE AREA STUDY I
INTRODUCTION The City of San Clemente covers an area of 17.1 square miles at the southernmost portion of Orange County.
The Citys Water Utilities Division provides water to most of the areas within the corporate boundaries.
Elevations within the study area vary between sea level and 900 feet above sea level. Due to the hilly terrain, and the phased development which has occurred, the existing water system includes twelve (1 2) distinct pressure zones defined by reservoirs and nineteen (19) sub-zones created by the use of pressure reducing stations.
The existing sources of domestic water supply consist of imported water through the Joint Regional Water Supply System Pipeline (formerly the Tri-Cities Municipal Water District Transmission Main), the Water Importation Pipeline (also known as the Pic0 Pipeline), and water pumped from a City owned well. The City of San Clemente produces recycled water at its Water Reclamation Plant. Recycled water is used for irrigation at the City (Municipal) Golf Course and the Pacific Golf Course, and for process and irrigation at the Water Reclamation Plant.
II PURPOSE The City of San Clemente operates one well (Well No. 6), which pumps an average of approximately 415 gallons per minute, providing about 5.8 percent of the Citys water supply. The purpose of this study is to evaluate the influence area of Well No. 6, and the makeup of water in the influence area in terms of percentage of well water and imported water during a typical operating period.
The City of San Clementes Water Master Plan and model, completed in 2006, was used to analyze the system. The computer model of the Citys water system was utilized to determine the area which is serviced from Well No. 6. The current model was updated to reflect the current conditions of the 1-295 Service Zone, where Well No. 6 production is eventually pumped to following treatment for iron and manganese.
111 STUDY AREA The City of San Clemente is located at the southern tip of Orange County. San Onofre State Park and unincorporated Orange County form the easterly City boundary. The Pacific Ocean and Capistrano Beach are located to the west; and the Cities of Dana Point and San Juan Capistrano, and unincorporated Orange County territory are located to the north.
The 1-295 Service Zone, also referred to as the Coastal Zone, is the main focus of this study because Well No. 6 provides groundwater to areas in this zone. The only facility that can convey the water originating at Well No. 6 to another zone is the Bahia Pump Station. However, with the construction of the Schlegel Pump Station, which takes suction from the Schlegel Reservoir, the Bahia Pump Station is placed in standby duty.
It would only be used if the Schlegel Pump Station is completely out of service and water cannot be conveyed to the 8-61 9 Service Zone from the 5-899 Service Zone.
1 K:lSsn Clemente, Clty oflGroundwafer AgrnglReporl We// No. 6 Influence Area Study
CITY OF §AN CLEMENTE The 1-295 Service Zone covers the entire area of the City west of the 1-5 Freeway and south of Avenida Pico, with the exception of that portion between East Avenida Palizada and Avenida Algodon east of the alley paralleling El Camino Real. This area is part of the 3-484 Service Zone. The 1-295 Service Zone also covers two areas east of the 1-5 Freeway. One of these is located between El Camino Real and the 1-5 Freeway.
The other area is bounded by Avenida Magdalena to the north, Avenida Santa Margarita to the east, the City boundary to the south, and the 1-5 Freeway to the west. Figure 1 illustrates the various service zones of the Citys water system.
IV EXISTING SYSTEM For this study, the Citys water system model was modified to isolate the 1-295 Service Zone. This zone receives its supply from the Local Transmission Main through Mendocino, Mateo, and Palizada Turnouts; McDonalds and Caballeros PR Stations; and from Well No. 6. McDonalds PR Station was not utilized during the field calibration work, and was assumed closed for this study as well.
The 1-295 Service Zone has a high water elevation of 295 feet above mean sea level (MSL), established by Reservoir 1. Reservoir 1 has a total volume of 0.45 MG. The 1-295 Service Zone is the largest service zone within the Citys system. The existing average day demand is 1909 gallons per minute (GPM).
The service elevations vary from sea level to 214 feet. The highest elevations are at Avenida Las Flores and El Oriente, where the maximum static pressure is 35 PSI.
Most of the distribution system piping is small, varying in size from 4-inch to 8-inch in diameter. In a majority of this service zone, the system is well looped, which helps mitigate the excessive pressure drop problems usually associated with the small diameter pipes.
V WATER SUPPLY The 1-295 Service Zone is supplied water through several means. There are the three (3) turnouts that supply water from the Local Transmission Main. Well No. 6 normally supplies the 1-295 Zone with potable water following treatment for iron and manganese. The water demands of the 1-295 Service Zone were determined through the hourly records of the water supplied at the turnouts, Well No. 6 operation, and the variations in the water levels in Reservoir 1. This information was also used in determining the 24-hour diurnal demand curve for this zone.
Turnout Water Supply Imported water is obtained through three (3) turnouts on the Local Transmission Main. The water meters at the turnouts were manually recorded in hourly intervals between 5:05 PM, Wednesday, August 16, 2006 to 450 PM, Friday August 18, 2006. The pattern of the turnout flow is shown on Figure 2.
The Palazada Turnout shows higher flows between 5:OO PM, Wednesday, August 16, 2006 to 12:OO AM Thursday, August 17,2006 and between 1 1 :00 AM and 500 PM, Friday, August 18,2006. During these time periods, the Palazada Pump Station was active. The flow through the pump station is delivered to Zone 3-484; therefore, this flow must be deducted from the Coastal Zone water supply analysis. The turnout water supply and pump station diversion can be seen in the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> analysis shown in Table 1.
2 Well No. 6 Influence Area Study K lSan Clernsnle. Cfly OnGroundwaler AginglRepon
T
CITY OF SAN CLEMENTE Figure 2 Hourly Turnout Flows 2,000 I
1,800 I
1,600 1,400 1,200 i - 1,000 800
' G I
600 400 I
200 0
I o a 5 T -
~
~
t
~
~
u L
o c
o l
E R
R l
T 8 -
Mendicino T.O.
5 Palizada T.O.
b Mateo T.O.
Hour i3 si 4
K:I:\\San Clernenre. Ciry oflGroundwarer AgingIReporl WellIvo. 6 ln#uence Area Study
CITY OF SAN CLEMENTE Well No. 6 Water Supply The groundwater basin from which the City pumps its local supply has a long term yield of approximately 1,000 acre feet per year. With such a source, the City could produce an average of approximately 1.50 CFS from the basin, and higher for shorter durations. However, with the existing well pumping capacity, the groundwater production is limited to 0.86 CFS. Between 2000 and 2005, the City's groundwater production varied from 233 GPM TO 386 GPM, excepting 2001 when Well No.6 was out of service. The groundwater pumped by the City has to be treated for iron and manganese in order to meet the Secondary Drinking Water Standards established by the State of California, prior to introduction into the distribution system.
Well No. 6 was in operation all day Wednesday, August 16, 2006 and stayed active until 1:00 PM on Thursday August 17, 2006. The well was modeled to provide 400 gpm while active. The schedule of well water operations is reflected in Table 1.
Reservoir 1 Water Supply Reservoir 1 is located on Calle Bahia, northeast of Avenida Santa Margarita. It has a total volume of 0.45 MG and a bottom elevation of 278 feet.
Figure 3 illustrates the hourly reservoir water level during the data collection period on August 16 and August 17. The differences in reservoir levels and the depth to volume relationship developed during the preparation of the City's Water Master Plan were used to determine the hourly flows into and out of the reservoir.
Figure 3 Reservoir 1 Depth Versus Time l 4 I l 3 I I
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Water Supplv Analvsis and Diurnal Curve The meter readings at the turnouts, along with the Well No. 6 pump schedule and Reservoir 1 elevation information between August 16, 2006 and August 18, 2006 were used to produce the 24-hour diurnal curve, which was then used as the demand pattern for all 649 nodes in the 1-295 Zone in the hydraulic model. The 5
KISan Clernenre. City ofiGroundwater AgrnglFleporl Well No. 6 Influence Area Study
CITY OF SAN CLEMENTE diurnal curve for the 1-295 Service Zone is shown on Figure 4. It illustrates the ratio of hourly demands to the average day demand. The total hourly water supply between 5:OO PM, August 16, 2006 to 5:OO PM, August 17, 2006 is shown in Table 1.
The system operation during this 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period was chosen as a representative day for this service zone and used for extended period analysis because Well No. 6 was in operation during that period.
Figure 4 1-295 Service Zone Demand Curve 250 I 8
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' 3 0.50 0.00 17 18 19 20 21 22 23 0 1
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VI WATER USE The City provided the July 2006 water billing records for the entire city. The billing records were divided into commercial, irrigation, multifamily residential and single family residential uses. After isolating zone 1-295 water users, the average daily flow was calculated to be 1909 GPM. The 2006 Sewer Master Plan estimated the Existing Average Day Demand to be about 2016 GPM; hence the demand estimate for this service zone is reasonable.
VI1 MODEL ANALYSIS The City's existing calibrated system computer model was completed in April, 2006. The network of pipes, nodes, reservoir, pumps, and valves was already built in the model. Once the 1-295 Service Zone was isolated, the current flow conditions were imported.
The water supply and water use were studied for the 1-295 Service Zone to attempt to replicate the true water demand conditions for this service area. The total water demand (1909 GPM) calculated from the July 2006 water use records was distributed among the four (4) water supply point sources. Well No. 6 was set up to provide 400 gpm throughout the study period. The three turnout points were set to supply the remainder of the water demand for the 1-295 Service Zone.
6 KrISan Clemente. Cily oflGroundwaler AgmglRepon WellNo. 6 Influence Area Study
CITY O F SAN CLEMENTE After distributing the water supply, the water demands were allocated to the nodes of the system. For the 1-295 Service Zone, the water users with a monthly consumption of 100 cubic feet or larger were analyzed as point source demands. The remaining demand (1525 GPM) was distributed evenly among the 649 nodes in the 1-295 Service Zone. The distribution of the water demand is shown in Table 2.
Table 2 Distribution of Flow I
I Total Water I High Water I Remaining 1 Use I FIOW (gprn) I FIOW (gpm) I FIOW (gprn) lrrioation I
144.051 108.451 35.60 Multi family I 71 9.841 120.881 598.96 Commercial I 234.891 145.571 89.32 SFR I
809.91 I 8.591 801.32 Totals 1908.691 383.491 1525.20 To analyze the effects of Well No. 6 on the system, the source tracing function from the modeling software was utilized.
This function tracks the percent of water reaching any node that had its origin at Well No. 6.
The system was analyzed over increasing durations to identify the total number of nodes utilizing any water originating from Well No. 6. In the 1-295 Service Zone model, it took approximately 167 hours0.00193 days <br />0.0464 hours <br />2.761243e-4 weeks <br />6.35435e-5 months <br /> to determine that the 288 of 649 nodes were affected by Well No. 6. These nodes are shown in Table 3, which shows the percentage of water coming from Well No. 6 after 167 hours0.00193 days <br />0.0464 hours <br />2.761243e-4 weeks <br />6.35435e-5 months <br /> has elapsed. The table also includes analysis of the well after a 10 week period (1680 hours0.0194 days <br />0.467 hours <br />0.00278 weeks <br />6.3924e-4 months <br />). These values represent the percent of the Well No. 6 water at each node once the system has stabilized. As shown in Table 3, out of the 288 nodes, 173 of the nodes had less than 2.5 percent of their water supply from Well No. 6. The remaining 115 nodes had more than 90 percent of their water from Well No. 6.
A map of the Well No. 6 influence area is shown on Figure 5. Whether highly influenced or not, a large area of the 1-295 Service Zone is supplied water from the Well No. 6. Well No. 6 services the area bound by El Camino Real to the west, W Avenida San Antonio to the south, the Pacific Ocean to the west and Linda Lane and Avenida Barcelona to the North. Well No. 6 also services the area bound by Avenida Del Presidente to the east, Calle lsabella to the South, the Pacific Ocean to the West, and Avenida Calafia to the North.
This study concluded that Well No. 6 influences a considerable portion of the 1-295 Service Zone.
7 K;lSsn Clemenfe. City ofiGroundwaler AgfnglReport Weif No. 6 Influence Area Study
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