Chemical Disclosures Now Available for Cosslett East

On June 27, 2025, Crestone Peak Resources finally submitted the required chemical disclosures for the hydraulic fracturing jobs at Cosslett East, 5 weeks after PSR/FracTracker’s expose on missing chemical disclosures was published on May 20, 2025. This report was submitted 679 days late; it was originally due on August 18, 2024, 150 days after the last well was spud on March 21, 2023. It’s yet another example where the industry is only held accountable by activist organizations where state regulatory agencies fail to do so.

“Pursuant to C.R.S. 34-60-132,” only the chemical CAS numbers (aka unique identifiers) and names are required to be reported, to protect operators’ proprietary formulas. We can, however, look at the chemical disclosures made by operators to FracFocus since 2012 and get an idea of the typical percentage and mass contribution of these chemicals to a typical hydraulic fracturing job. Here is the data:

CAS Number	Chemical Name	Typical %	Typical Mass (lbs)	Frac Jobs
7732-18-5	Water	90.815388%	49,534,667	15,150
14808-60-7	Silicon Dioxide	9.612451%	5,702,513	13,370
9000-30-0	Guar Gum	0.109516%	42,505	2,682
7647-01-0	Hydrochloric Acid	0.043000%	29,410	10,837
64742-47-8	Hydrotreated Light Petroleum Distillate	0.020022%	9,581	13,078
25987-30-8	Acrylamide, Sodium Acrylate Polymer	0.018795%	6,840	1,375
68953-58-2	Organophylic Clay	0.016316%	929	411
9016-45-9	Ethoxylated NonyLPhenol	0.008310%	2,559	97
7647-14-5	Sodium Chloride	0.004896%	2,351	7,280
67-56-1	Methanol	0.001024%	591	10,600
64-17-5	Ethanol	0.000866%	533	7,588
63428-92-2	Formaldehyde, Polymer With 2-Methyloxirane, 4-NonyLPhenol And Oxirane	0.000735%	192	75
64742-94-5	Heavy Aromatic Petroleum Naphtha	0.000350%	240	5,676
29316-47-0	Formaldehyde, Polymer With 4-(1,1-Dimethylethyl)Phenol And 2-Methyloxirane	0.000317%	92	73
61790-12-3	Fatty Acid, Tall-Oil	0.000216%	345	878
68951-67-7	Alcohols, C14-15, Ethoxylated	0.000095%	58	581
68527-49-1	Thiourea-Formaldehyde Copolymer	0.000085%	40	1,479
127087-87-0	Poly(Oxy-1,2-Ethanediyl), ALPha-(4-NonyLPhenyl)-Omega-Hydroxy-, Branched	0.000075%	43	5,903
91-20-3	Naphthalene	0.000056%	39	5,746
107-19-7	Propargyl Alcohol	0.000044%	27	1,518
112926-00-8	Silica Gel	0.000043%	30	303
95-63-6	1,2,4-Trimethylbenzene	0.000011%	8	5,661

Notes and Observations

• In the chart above, “typical” refers to the median percentage and mass across all 20,595 disclosure records available in the FracFocus database.
• Entries highlighted in red do not appear in any FracFocus disclosures ever made by Crestone Peak Resources, i.e. the disclosure of the use of these chemicals by Crestone Peak Resources is new.
• Several chemicals, such as Ethoxylated NonyLPhenol, are rarely disclosed in hydraulic fracturing jobs. Formaldehyde is also rarely disclosed (as a biocide to prevent microbial growth), but poses cancer, asthma, and respiratory risks.