ML102030475

Drawing - Area of Tritium Impacts in Shallow Groundwater, Figure 4

ML102030475
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	04/15/2010
From:	GZA GeoEnvironmental
To:	Entergy Nuclear Vermont Yankee, Office of Information Services
References
FOIA/PA-2010-0209
Download: ML102030475 (1)

Text

223.4 219.4 2J 225-2, ,;' V,29~120 GZ-1 1.0 -',6V'N~~3/4. 25j. ~ ~ aS WEOF1CAJ S02 f fD E A.A Cil 3301GITH 232-MOETTOTZ

-. 3Sn~A. RS W232.4TmAS Si 23-0 &V LD N iTO 3f WOSS TT A S- U\GZ 3301R* ~ ~iTSA T~PRELIINAR

.17 PROGRSS PRNT < 233 LEGEND COB WELLe VERMONT YANKEE BEDROCK OL qUDRINKING WATER WELL OFF-LINE FOR PRECAUTIONARY REASONS GZ-!Qk. MONITORING WELL INSTALLEE JANUARY-MARCH 2010 GROUNDWATER ELEVATION IN FEET (FEBRUARY 26,2010)GZ-*OGPI MONITORING WELL INSTALLED NOVEMBER 2007 3201+ OTHER VERMONT YANKEE MONITORING WELLINFERRED GROUNDWATER CONTOUR IN FEET (FEBRUARY 26,2010).INFERRED AREA OF TRITIUN ACTMITY IN SHALLOW GROUNDWATER

(>MDA)INFERRED CENTERUNE OF--TRITIUM IMPACT IN SHALLOW GROUNDWATER 0 50y 100 20W SCALE IN FEET NOTES: 1. AREA OF TRITIUM ACTIVITY IN SHALLOW GROUNDWATER INFERRED FROM DATA FROM WIDELY SPACED MONITORING WELLS. ACTUAL CONDITIONS MAY VARY. RECENTLY, A TRACE LEVEL OF TRITIUM ACTIVITY HAS BEEN INCONSISTENTLY DETECTED AT GZ-11.2. GROUNDWATER CONTOURS AND FLOW DIRECTIONS INFERRED FROM GROUNDWATER ELEVATION MEASUREMENTS COLLECTED FROM WIDELY SPREAD MONITORING WELLS ON FEBRUARY 26,2010. ACTUAL CONDITIONS MAY VARY.a IT SHOULD BE NOTED THAT WHILE THE COB WELL AND GZ-14D ARE LOCATED WITHIN THE SHADED AREA SHOWN, BOTH WELLS ARE SCREENED BELOW TI- SHALLOW GROUNDWATER ZONE AND NOT WITHIN IT. GZ-14D IS A DEEP OVERBURDEN WELL AND HAS GENERALLY SHOWN NO DETECTABLE LEVELS OF TRITIUM. THE COB WELL IS A DEEP BEDROCK WELL THAT WAS FORMERLY USED FOR WATER SUPPLY, AND HAS SHOWN NO DETECTABLE LEVELS OF TRITIUM. LOW LEVELS OF TRITIUM HAVE RECENTLY BEEN DETECTED AT THE DEEP OVERBURDEN WELL, GZ-13D, ALONG THE NORTH FLANK OF THE AREA OF TRITIUM ACTMITY.4. FLUCTUATIONS IN LOCAL GROUNDWATER ELEVATIONS MAY OCCUR OVER TIME DUE TO RAINFALL, SEASONAL CHANGES IN THE RATE OF EVAPOTRANSPIRATION.

RELEASE RATES FROM THE LOCAL DAM, AND OTHER VARIOUS FACTORS.5. THE LOCATIONS AND REFERENCE ELEVATIONS OF MONITORING WELLS AND DRINKING WATER WELLS WERE SURVEYED BY SOUTHERN VERMONT ENGINEERING OF BRATTLEBORO VERMONT (EXCEPT GZ-20 AND GZ-21, WHICH WERE ESTIMATED PENDING FORMAL SURVEY).6. BASE PLAN, INCLUDING SITE TOPOGRAPHY, PROVIDED TO GZA IN ELECTRONIC FORMAT BY VERMONT YANKEE.ENTERGY VERMONT YANKEE VERNON, VERMONT AREA OF TRITIUM IMPACTS IN SHALLOW GROUNDWATERZAe.,ait., , F ENTERGYVERMONT YANKEE VERNON, VERMONT" ~-- JR I -JOOP ER UNS I GASOM I- I VOWO 1ý10 I Mý mltl 0 1 oc I