Attachment_3_Constituents_and_Metals_List.pdf

ATTACHMENT 3

RFQ 140P8522Q0005 – Sludge Removal & Disposal at Yosemite NP Page 1 of 1

CONSTITUENTS AND METALS LIST REQUIIREMENTS

WHEN TO DO STLC EXTRACTIONS

The limits for STLC and TTLC metals are listed below along with the range of TTLC concentrations for which a STLC extraction must be done.

SUBSTANCE

STLC

(mg/L)

RANGE OF TTLC VALUES FOR WHICH AN

STLC MUST BE DONE (10 x STLC)

TTLC

(mg/kg)

Antimony 15 150 mg/kg or greater 500

Arsenic 5.0 50 mg/kg or greater 500

Barium 100 1000 mg/kg or greater 10,000

Beryllium 0.75 7.5 mg/kg or greater 75

Cadmium 1.0 10 mg/kg or greater 100

Chromium 6 5.0 50 mg/kg or greater 500

Chromium 5.0 50 mg/kg or greater 2,500

Cobalt 80 800 mg/kg or greater 8,000

Copper 25 250 mg/kg or greater 2,500

Lead 5.0 50 mg/kg or greater 1,000

Mercury 0.2 2 mg/kg or greater 20

Molybdenum 350 3,500 mg/kg or greater 3,500

Nickel 20 200 mg/kg or greater 2,000

Selenium 1.0 10 mg/kg or greater 100

Silver 5.0 50 mg/kg or greater 500

Thallium 7.0 70 mg/kg or greater 700

Vanadium 24 240 mg/kg or greater 2,400

Zinc 250 2,500 mg/kg or greater 5,000

If you have a solid sample analyzed for metals (TTLC) you must do an STLC for those metals that are 10 times or greater than the STLC limit. For example – The TTLC limit for antimony is 500 mg/kg and the STLC limit is 15 mg/L. If your TTLC result is 150 mg/kg or higher they you must do an STLC for antimony.

STLCs are based on “as is” waste, that is, solids plus any diluting water. The extraction test used to determine the soluble concentrations results in a ten times dilution of the waste, therefore, if the total metals concentration of the waste on either a dry weight or wet weight basis is less than the listed “10 x STLC” value in the above chart, the waste cannot be hazardous for that constituent, and further consideration is not necessary. If the dry weight concentration still exceeds the “10 x STLC” value, a representative sample of the biosolids should be analyzed by the Waste Extraction Test (WET) procedure. If the results of the WET procedure exceed the STLC values, the waste is “hazardous” unless granted a variance by DTSC.