Final Remedial Action Completion Report for the ... - Rvaap.org

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Comment
Shaw Environmental, Inc. 17 of 39
Recommendation
Response
mg/L), LL1mw082
(0.000356 mg/L),
LL1mw084 (0.00047 mg/L),
LL2mw263 (0.0000555 mg/L
J), LL2mw266
(0.000112mg/L and 0.000101
mg/L), LL2mw269
(0.000564 mg/L J),
LL3mw236 (0.000509
mg/L), LL3mw238
(0.000377 mg/L),
LL3mw239 (0.00123 mg/L),
LL4mw196 (0.000649
mg/L), LL4mw197 (0.0002
mg/L) and LL4mw198
(0.000601 mg/L);
• Dissolved Zinc – LL1mw084
(0.0993 mg/L), LL2mw267
(0.0679 mg/L J) and
LL4mw198 (0.115 mg/L).
All the concentrations listed above
for dissolved manganese exceed the
drinking water Secondary Standards.
All the concentrations listed above
for dissolved antimony, barium,
beryllium, cobalt, lead, nickel,
selenium, thallium and zinc exceed
the applicable background criteria.
Arsenic concentrations exceeded the
Region 9 PRG at all the well
locations identified above. A
dissolved arsenic concentration of
0.0104 milligrams per liter (mg/L)
just exceeded the drinking water
MCL of 0.01 mg/L at LL2mw263.
None of the arsenic concentrations
exceeded the background criteria of
0.0117 mg/L.