25 July 199 3

To: From:

Majelle Jensen Neil Mukherjee

SUBJECT : JUNE 1993 QUARTERLY GROUNDWATER SAMPLING AT SSFLControls for Environmental Pollution Inc .Report Nos . 93-06-216 , 93-07-001, and 93-07-07 0

1 . R/A DATA ONLY . REPORT NO . 93-06-216 SHOWED THE RESULTS OF

GROSS ALPHA RADIOACTIVITY, GROSS BETA RADIOACTIVITY, RADIUM-226 ANALYSES FOR 11 WELLS INCLUDING 6 CHATSWORTH FORMATION

WELLS ,-- 1 WATER-SUPPLY WELL , AND 4 SHALLOW ZONE WELLS . TWO

CHATSWORTH FORMATION WELLS, HAR-7 NEAR DELTA OF AREA II AND

RD-18 NORTHEAST OF B/133 IN AREA IV , SHOWED R/A (RADIUM-226)

ABOVE MCL . TWO SHALLOW ZONE WELLS SHOWED R/A ABOVE MCL . THEY

WERE, RS-8 (FOR GROSS ALPHA RADIOACTIVITY) OF ABSP IN AREA II

AND HAR-15 (FOR GROSS ALPHA AND BETA RADIOACTIVITIES ANDRADIUM-226) OF SPA IN AREA II . A TOTAL OF SEVEN WELLSINCLUDING 1 WATER-SUPPLY WELL (WS-4A OF AREA I), 4 CHATSWORTH

FORMATION WELLS (1 IN AREA I, 1 - IN AREA II, AND 2 IN THE

BU,1FER ZONE) , AND 2 SHALLOW ZONE WELLS (IN AREA II AND AREAIII) RECORDED R/A BELOW MCL .

REPORT NOS . 93-07-001 AND 93-07-070 WERE FOR CONFIRMATORY AND

FOLLOW-UP R/A TESTS ( RADIUM-226, GROSS . ALPHA AND BETA

RADIOACTIVITIES, AND RADIUM-228) ON 3 OF THE 4 WELL SAMPLES

WITH R/-A ABOVE MCL .

2 . TRANSMITTAL TO BRANDEIS- BARDIN INSTITUTE (BBI) :

Within 30 days . The wells reported are not located in the BBIproperty .

3 . AREA II WELLS WITH R/A ABOVE MCL :

HAR-7, Chatsworth Formation well east of Delta impoundment,

recorded Radium-226 at 9 .0 +/- 3 .5 pCi/L, but both alpha and

beta radioactivities were below the MCL . The March 1993

Radium-226 concentration was <0 .6 pCi/L . The follow-up tests

on June 1993 samples showed < 0 .6 pCi/L Radium-226 and 2 +/-

1 pCi/L Radium-228 .

HAR-15, Chatsworth Formation well north of SPA-2 impoundment,showed 54 +/- 11 pCi/L gross alpha radioactivity, 66 +/- 10pCi/L gross beta radioactivity, and 24 .9 +/- 4 .3 pCi/L Radium-

226 . The follow-up tests on dissolved constituents showed 4

+/- 3 pCi/L gross alpha radioactivity, 7 +/- 5 pCi/L gross

beta radioactivity, < 0 .6 pCi/L Radium- 226, and 2 +/- 1

pCi/L Radium- 228 . This well also recorded 70 +/- 14 pCi/L

gross alpha radioactivity, 45 +/- 9 pCi/L gross beta

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radioactivity, 'and 29 .5 +/- 4 .2 pCi/L (follow-up test levelof <0 .6 pCi/L) Radium-226 in March 1993 .

RS-8, Shallow zone well northwest of ABSP impoundment,recorded 16 +/- 4 pCi/L gross alpha radioactivity, compared to14 +/- 9 pCi/L gross alpha radioactivity of March 1993 . Thegross beta radioactivity was 13 +/4 pCi/L and Radium-226was 2 .4 + /- 1 .0 pCi/L in June 1993 .

4 . AREA IV WELL WITH RJA ABOVE MCL :

RD-18, Chatsworth Formation well northeast of BJ133, showed10 .8 +/- 3 .8 pCi/L Radium-226, compared to 4 .0 +/- 2 .4 pCi/Lof June 1993 . The gross alpha and beta radioactivities forJune 1993 were below MCL and Radium-228 were < 1 pCi/L .

5 . The results did not indicate the presence of high R/Acaused by man-made activities . According to the SSFI. R/ALaboratory the highs were due to the presence of naturallyoccurring uranium and its daughter products . In some cases,the higher concentrations were perhaps obtained because ofinadgquate filtering of the samples in the laboratory . Lowerconcentration recorded by the testing of the dissolvedspecies indicated this possibility .

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cc : P . BlandinoN . Fujikawa

BNA03217974

HDMSe00327997