Heavy storms that contribute more flows than the treatment plant can handle may overwhelm the sewage treatment system, causing a spill or overflow [called a combined sewer overflow, or CSO, in the US]. It is preferable to have a separate storm drain system for stormwater in areas that are developed with sewer systems.

Metals Analysis

Per Element

Method	Inductively Coupled Plasma [ICP]
EPA 200.7, EPA 6010B	Aluminum, Antimony, Arsenic, Barium, Beryllium, Boron, Cadmium, Calcium, Chromium, Cobalt, Copper, Iron, Lead, Lithium, Magnesium, Manganese, Molybdenum, Nickel, Potassium, Selenium, Silica, Silver, Sodium, Strontium, Titanium, Thallium, Vanadium, Zinc.
	Practical Quantitaion Limits [PQLs] range from 5 ug/l to 100 ug/l.
	Cold Vapor Atomic Absorption [CVAA]
EPA 7471A, 7471A, 245.1	Mercury
	Inductively Coupled Plasma/Mass Spectrometry [ICP/MS]
EPA 200.8	Antimony, Arsenic, Barium, Beryllium, Cadmium, Chromium, Cobalt, Copper, Lead, Manganese, Molybdenum, Nickel, Selenium, Silver, Thallium, Vanadium, Zinc, Tin, Lithium.
EPA 6020A	Antimony, Arsenic, Barium, Beryllium, Cadmium, Chromium, Cobalt, Copper, Lead, Manganese, Molybdenum, Nickel, Selenium, Silver, Thallium, Vanadium, Zinc, Tin, Lithium, Calcium, Magnesium, Iron, Sodium, Potassium, Aluminium.
	Graphite Furnace Atomic Absorption [GFAA]
EPA 200.9, EPA 7041	Antimony
EPA 200.9, EPA 7060A	Arsenic
EPA 210.2, EPA 7091	Beryllium
EPA 213.2, EPA 7131A	Cadmium
EPA 218.2, EPA 7191	Chromium
EPA 220.2, EPA 7211	Copper
EPA 239.2, EPA 7421	Lead
EPA 249.2, EPA 7521	Nickel
EPA 200.9, EPA 7740	Selenium
EPA 272.9 EPA 7761	Silver
EPA 279.2 EPA 7841	Thallium

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