An Approach to Industrial Stormwater Benchmarks: Establishing and Using Site-Specific Threshold Criteria at Lawrence Livermore National Laboratory Page: 10 of 12
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Influent or Threshold
Parameter Date Location Effluent Result criteriaa
Zinc 04/06/01 ASS2 Influent 0.18 0.117
Zinc 04/06/01 ASW Effluent 0.27 0.117
Water Year 2003-2004
Beryllium 02/02/04 ALPO Influent 0.0018 0.0016
COD 02/02/04 ALPO Influent 230 200
Copper 12/29/03 ALPO Influent 0.0153 0.013
Copper 12/29/03 WPDC Effluent 0.0156 0.013
Copper 02/02/04 ASW Effluent 0.0167 0.013
Copper 02/02/04 ALPE Influent 0.023 0.013
Copper 02/02/04 ALPO Influent 0.0691 0.013
Copper 02/02/04 WPDC Effluent 0.0296 0.013
Copper 02/25/04 ALPE Influent 0.022 0.013
Copper 02/25/04 ALPO Influent 0.021 0.013
Copper 02/25/04 WPDC Effluent 0.013 0.013
Diuron 12/11/03 ALPO Influent 0.58 0.014
Diuron 12/11/03 GRNE Influent 0.18 0.014
Diuron 12/29/03 ALPO Influent 1.20 0.014
Diuron 12/29/03 ALPE Influent 0.073 0.014
Lead 02/02/04 ALPO Influent 0.025 0.015
Lead 02/02/04 WPDC Effluent 0.016 0.015
Mercury 12/29/03 ALPO Influent 0.00041 0.0002
Nitrate (as NO3) 12/11/03 GRNE Influent 15 10
Nitrate (as NO3) 12/29/03 GRNE Influent 15 10
Oil & Grease 12/29/03 ALPO Influent 9.2 9
Oil & Grease 12/29/03 WPDC Effluent 10 9
TSS 02/02/04 ALPO Influent 1900 750
Zinc 12/11/03 WPDC Effluent 0.62 0.35
Zinc 02/02/04 WPDC Effluent 0.625 0.35
Gross alpha (Bq/L) 12/29/03 ALPO Influent 0.353 + 0.15 0.34
Gross alpha (Bq/L) 02/02/04 ALPO Influent 0.703 + 0.26 0.34
Gross beta (Bq/L) 02/02/04 ALPO Influent 1.17 + 0.26 0.48
a Threshold criteria presented are those that were in effect during each water year evaluated.
changed in subsequent water years.
Criteria may have
Analysts use this type of table to quickly scan for potential water quality issues that
require follow-up. High concentrations at the influent locations are documented even
when there is not a corresponding high value at the effluent location during the same
In the two water years presented, three constituents were high at the effluent location
without a corresponding influent explanation: copper, zinc, and oil and grease.
Therefore, analysts began to evaluate and track these constituents. Source
investigations at LLNL did not reveal any particular industrial process sources for these
constituents. In subsequent water years, there has not been a recurrence of the oil and
grease effluent threshold exceedance. Copper and zinc recur sporadically. These two
constituents also frequently exceed the threshold at influent locations. As found in
many municipal programs, zinc and copper are common in the urban watershed; zinc
as a building material (corrugated metal pipes used for storm drains, overhead covers,
security fencing) and copper from vehicle brake-pad wear.
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Campbell, C G & Mathews, S. An Approach to Industrial Stormwater Benchmarks: Establishing and Using Site-Specific Threshold Criteria at Lawrence Livermore National Laboratory, article, September 7, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc886697/m1/10/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.