Evaluation and Reporting on Contaminant Hydrogeological
12-12-01
Conditions at the Tajiguas Landfill
Page 17 of 24
No verification as to what point sources of the aforementioned contamination in
groundwater has been provided.
(96 Correspondence.tif, Image 4)
A October 15, 1996 County letter to the Regional board reports that the
September
20 & 23, 1996, third quarter sampling event, had the following compounds identified
in groundwater monitoring wells:
1) methoxytrimethylsilane in MW#2 @ 9 ppb, MW#3 @ 10 ppb, MW#4 @ 12 ppb,
MW#10 @ 6 ppb, MW#12 @ 16 ppb and MW#15 @ 18 ppb
2) trimethylsilanol in MW#2 @ 16 ppb, MW#3 @ 20 ppb, MW#4 @ 29 ppb, MW#10
@ 74 ppb MW#12 @ 36 ppb, MW#14 37 ppb and
MW#15 39 ppb
3) fluorotrimethylsilane in MW#2 @ 8 ppb, MW#14 @ 16 ppb and MW#15 34 ppb.
4) benzene in MW#10 @ 0.7 ppb
5) cis-1,2-dichloroethene @ 0.6 ppb
No verification as to what point sources of aforementioned contamination in
groundwater has been provided.
(96 Correspondence.tif, Image 18)
A July 8, 1997 (incorrect letter date July 8, 1996) County letter to the Regional
board reports that the June 23 & 24, 1997, second quarter sampling event, had the
following compounds identified in groundwater monitoring wells:
1) methoxytrimethylsilane in MW#10 @ 9.1 ppb, MW#12 @ 5.1 ppb;
2) trimethylsilanol in MW#10 @ 150 ppb;
3) fluorotrimethylsilane in MW#15 @ 11 ppb
4) benzene in MW#10 @ 0.79 ppb
5) 1,2,4- trimethylbenzene in MW#15 @ 0.77 ppb
No verification as to what point sources of aforementioned contamination in
groundwater has been provided.
