Final Remedial Action Completion Report for the ... - Rvaap.org
Final Remedial Action Completion Report for the ... - Rvaap.org
Final Remedial Action Completion Report for the ... - Rvaap.org
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Cmt.#<br />
Page #<br />
Line #<br />
New Page<br />
or Sheet<br />
Comment<br />
Shaw Environmental, Inc. 26 of 39<br />
Recommendation<br />
Response<br />
LL4mw198 (0.115 mg/L).<br />
All <strong>the</strong> concentrations listed above<br />
<strong>for</strong> dissolved manganese exceed <strong>the</strong><br />
drinking water Secondary Standards.<br />
All <strong>the</strong> concentrations listed above<br />
<strong>for</strong> dissolved antimony, barium,<br />
beryllium, cobalt, lead, nickel,<br />
selenium, thallium and zinc exceed<br />
<strong>the</strong> applicable background criteria.<br />
Arsenic concentrations exceeded <strong>the</strong><br />
Region 9 PRG at all <strong>the</strong> well<br />
locations identified above. A<br />
dissolved arsenic concentration of<br />
0.0104 milligrams per liter (mg/L)<br />
just exceeded <strong>the</strong> drinking water<br />
MCL of 0.01 mg/L at LL2mw263.<br />
None of <strong>the</strong> arsenic concentrations<br />
exceeded <strong>the</strong> background criteria of<br />
0.0117 mg/L.<br />
3.2.8.5 Pesticides and PCBs<br />
Concentrations of <strong>the</strong> pesticide 4,4’-<br />
DDT were detected in groundwater<br />
samples above <strong>the</strong> method detection<br />
limits at <strong>the</strong> following two well<br />
locations on LL 2:<br />
• 4,4’-DDT – LL2mw262<br />
(0.0311 µg/L J, 0.0433 µg/L<br />
J, 0.0631 µg/L J and 0.075<br />
µg/L J), LL2mw266 (0.022<br />
µg/L J and 0.030 µg/L J)<br />
These pesticide concentrations<br />
exceed <strong>the</strong> Region 9 PRG of 0.2<br />
µg/L. No PCBs were identified<br />
above <strong>the</strong> method detection limits in<br />
any of <strong>the</strong> groundwater samples<br />
collected.