What does "PC Code" and "DP Number" mean?

Pesticide Chemical Code
Digital point barcode - or point of sale..

EPA (RCRA) Identifier—Enter the 12-character identification code. Most EPA Identifiers will begin with TXD or TXR, followed by nine numbers.

A US EPA ID Number is site-specific (except when issued to a transporter) and permanent (unless issued as a Provisional number, as discussed below). It does not move with the current owner/operator should they relocate unless the owner/operator is a transporter. It is used by EPA to track hazardous wastes from the point of generation to the final disposal site, also known as the "cradle-to-grave" cycle. Once a US EPA ID number is assigned to a specific physical location, it belongs solely to that location and will belong to any owners/operators at that location. "One RCRA EPA ID for One RCRA Subtitle C Site". When a business, located at a site where a US EPA ID number exists, moves to another location (even within the same State or town) the ID number must be inactivated at the former location and a new ID number requested at the new location. A new form is required when relocating or requesting a new US EPA ID number. If at the new location, a RCRA hazardous waste ID number had previously been issued to the former owner/operator, the number for that physical location will then be assigned to the new requester. If a number had never been issued for that physical location, a new number will be issued to the new requester.

TXR No.

Quote:

EPA (RCRA) Identifier—Enter the 12-character identification code. Most EPA Identifiers will begin with TXD or TXR, followed by nine numbers.

US EPA ID Number

Quote:

A US EPA ID Number is site-specific (except when issued to a transporter) and permanent (unless issued as a Provisional number, as discussed below). It does not move with the current owner/operator should they relocate unless the owner/operator is a transporter. It is used by EPA to track hazardous wastes from the point of generation to the final disposal site, also known as the "cradle-to-grave" cycle. Once a US EPA ID number is assigned to a specific physical location, it belongs solely to that location and will belong to any owners/operators at that location. "One RCRA EPA ID for One RCRA Subtitle C Site". When a business, located at a site where a US EPA ID number exists, moves to another location (even within the same State or town) the ID number must be inactivated at the former location and a new ID number requested at the new location. A new form is required when relocating or requesting a new US EPA ID number. If at the new location, a RCRA hazardous waste ID number had previously been issued to the former owner/operator, the number for that physical location will then be assigned to the new requester. If a number had never been issued for that physical location, a new number will be issued to the new requester.