Common use of Calculation of the Volumetric Compensation for Quality Clause in Contracts

Calculation of the Volumetric Compensation for Quality. The Volumetric Compensation for Quality is a process independent from the monthly balance of the system per senders. This process is made after making said monthly balance official, and the adjustments generated by the process will be included in the monthly balance of the Month of Operation for which the adjustments of the Volumetric Compensation for Quality were figured out. The steps to be followed in the calculation of distribution of volumes in the Volumetric Compensation for Quality are shown in Illustration (3). DC – Crude Oil Transportation Agreement – 018 – 2013 91 § Determine deliveries per Sender (Original Barrels = Ei § Determine the price of the currents that converge (Qi = $ USD / BBL) x Ei § Calculate the fraction of the cost fir each sender (F. C. = Qi / Q T § Calculate the Equivalent Barrels per Sender (B. Eq. = Original Bls x F. C) § Calculate Adjustments CVC = Equivalent Barrels – Original Barrels) Illustration 3 – CVC Calculation Scheme Where: Ei = Deliveries per sender in the entry node Qi = Price of the currents that are delivered in the entry node F. C. = Percentage of the ratio between the price of the deliveries per sender and the total price of the currents of all senders DC – Crude Oil Transportation Agreement – 018 – 2013 92 Sediment and water or particles Not to exceed 0.5% in volume Sediments – ASTM D 473Water – Xxxx Xxxxxx API at 60 ºF Higher than 18 API degrees, but lower than 50 API Decrees D 1298 Viscosity @ the temperature of reference Not to exceed 300 cSt at 30 ºC ASTM D 445 or D 446 Vapor Pressure Not to exceed 11 lb / square inchReid Vapor Pressure ASTM D 323 Receipt Temperature Not to exceed 120 ºF Salt contents 20 PTB ASTM D 3230 Fluidity Point Not higher than 12 ºC ASTM D 93 DC – Crude Oil Transportation Agreement – 018 – 2013 93 1. Orito – Tumaco Pipeline (OTA):

Calculation of the Volumetric Compensation for Quality. The Volumetric Compensation for Quality is a process independent from the monthly balance of the system per senders. This process is made after making said monthly balance official, and the adjustments generated by the process will be included in the monthly balance of the Month of Operation for which the adjustments of the Volumetric Compensation for Quality were figured out. The steps to be followed in the calculation of distribution of volumes in the Volumetric Compensation for Quality are shown in Illustration (3). DC – Crude Oil Transportation Agreement – 018 – 2013 91 § Determine deliveries per Sender (Original Barrels = Ei § Determine the price of the currents that converge (Qi = $ USD / BBL) x Ei § Calculate the fraction of the cost fir each sender (F. C. = Qi / Q T § Calculate the Equivalent Barrels per Sender (B. Eq. = Original Bls x F. C) § Calculate Adjustments CVC = Equivalent Barrels – Original Barrels) Illustration 3 – CVC Calculation Scheme DC – Contrato de Transporte de Crude Oil – 017 – 2013 93 Where: Ei = Deliveries per sender in the entry node Qi = Price of the currents that are delivered in the entry node F. C. = Percentage of the ratio between the price of the deliveries per sender and the total price of the currents of all senders DC – Contrato de Transporte de Crude Oil Transportation Agreement – 018 017 – 2013 92 94 Sediment and water or particles Not to exceed 0.5% in volume Sediments – ASTM D 473Water – Xxxx Xxxxxx API at 60 ºF Higher than 18 API degrees, but lower than 50 API Decrees D 1298 Viscosity @ the temperature of reference Not to exceed 300 cSt at 30 ºC ASTM D 445 or D 446 Vapor Pressure Not to exceed 11 lb / square inchReid Vapor Pressure ASTM D 323 Receipt Temperature Not to exceed 120 ºF Salt contents 20 PTB ASTM D 3230 Fluidity Point Not higher than 12 ºC ASTM D 93 DC – Contrato de Transporte de Crude Oil Transportation Agreement – 018 017 – 2013 9395 1. Mansoyá – Orito – Tumaco Pipeline (OTA):OMO): DC – Contrato de Transporte de Crude Oil – 017 – 2013 96 Attachment D Quality of the Hydrocarbon to be Transported According to the provisions of the Transporter Manual: • the Quality of the Hydrocarbon set forth in this Attachment, corresponds to the quality that the final blend of Crude Oil to be delivered by the SENDER must have. In the event that the Crude Oil delivered by the SENDER does not meet the Hydrocarbon Quality set forth in this Attachment and that it requires the purchase of diluents to make blends or any other type of expense to make its transportation feasible, the SENDER must request the approval of CENIT before the Delivery for transportation by CENIT. • It is the responsibility of the SENDER to guarantee that it has the right to deliver or to make others Delivery in its name the Crude Oil that CENIT receives at the Point of Entry. The SENDER will hold CENIT harmless in good fait, released for responsibility for any claim, action or damage that could arise from lawsuits, claims or administrative, judicial and extrajudicial actions of third parties that dispute the ownership or possession of the Crude Oil being Transported. • CENIT reserves the right to receive or not the Crude Oil Owned by the SENDER that does not meet the minimum values specified; in case that it receives it, the SENDER will pay to the Transporter the costs incurred in the analysis and in the eventual treatment of said Crude Oil to bring it to the specifications required or to implement the scheme required for its transportation. DC – Contrato de Transporte de Crude Oil – 017 – 2013 97 Attachment D Quality of the Hydrocarbon to be Transported • CENIT reserves the right to request, reject or approve the injection, at any point of the Pipeline of products such as corrosion inhibiters, fluidity point depressors, friction reducers or any other additive on the Hydrocarbon to be transported. The SENDER will pay CENIT the costs incurred in the analysis and in the eventual treatment of this Hydrocarbon to bring it to the specifications required or to implement the scheme required for its transportation. • CENIT reserves the right to transport the Crude Oil Owned by the SENDER delivered by the SENDER that exceeds the limits determined by the Transporter for organic chloride, sand, dust, dirt, glues, impurities, other objectionable substances or other composites with physical or chemical characteristics that, in the exclusive determination of the Transporter, can mean that the Hydrocarbon is not easily transportable, may damage the Pipeline, or may interfere with the transportation and the delivery. The SENDER will pay CENIT the costs incurred in the analysis and in the eventual treatment of this Hydrocarbon to bring it to the specifications required or to implement the scheme required for its transportation. • The Transporter, acting in a reasonable manner and in good faith, will have the right to suggest any change of the minimum quality specifications of the Crude Oil Owned by the SENDER, from time to time, according to the operational practices, which may be necessary or adequate, including, but not limited to, to prevent material damages or the material degradation of the Effective Capacity of the Pipeline, to prevent personal injuries or damages to the property or the environment. Any change of specification must be subject to an express written agreement of the Parties. DC – Contrato de Transporte de Crude Oil – 017 – 2013 98 Attachment E CENIT’S Compliance Manual DC – Contrato de Transporte de Crude Oil – 017 – 2013 99 Attachment E CENIT’S Compliance Manual Description Version Date of Approval by the Board of Directors Document Creation 25 February 2013 DC – Contrato de Transporte de Crude Oil – 017 – 2013 100 Attachment E CENIT’S Compliance Manual

Calculation of the Volumetric Compensation for Quality. The Volumetric Compensation for Quality is a process independent from the monthly balance of the system per senders. This process is made after making said monthly balance official, and the adjustments generated by the process will be included in the monthly balance of the Month of Operation for which the adjustments of the Volumetric Compensation for Quality were figured out. The steps to be followed in the calculation of distribution of volumes in the Volumetric Compensation for Quality are shown in Illustration (3). DC – Crude Oil Transportation Agreement – 018 – 2013 91 § Determine deliveries per Sender (Original Barrels = Ei § Determine the price of the currents that converge (Qi = $ USD / BBL) x Ei § Calculate the fraction of the cost fir each sender (F. C. = Qi / Q T § Calculate the Equivalent Barrels per Sender (B. Eq. = Original Bls x F. C) § Calculate Adjustments CVC = Equivalent Barrels – Original Barrels) Illustration 3 – CVC Calculation Scheme Where: Ei = Deliveries per sender in the entry node Qi = Price of the currents that are delivered in the entry node F. C. = Percentage of the ratio between the price of the deliveries per sender and the total price of the currents of all senders DC – Contrato de Transporte de Crude Oil Transportation Agreement – 018 008 – 2013 92 81 Sediment and water or particles Not to exceed 0.5% in volume Sediments – ASTM D 473Water – Xxxx Xxxxxx API at 60 ºF Higher than 18 API degrees, but lower than 50 API Decrees D 1298 Viscosity @ the temperature of reference Not to exceed 300 cSt at 30 ºC ASTM D 445 or D 446 Vapor Pressure Not to exceed 11 lb / square inchReid Vapor Pressure ASTM D 323 Receipt Temperature Not to exceed 120 ºF Salt contents 20 PTB ASTM D 3230 Fluidity Point Not higher than 12 ºC ASTM D 93 DC – Contrato de Transporte de Crude Oil Transportation Agreement – 018 008 – 2013 9382 1. Mansoyá – Orito – Tumaco Pipeline (OTA):OMO): DC – Contrato de Transporte de Crude Oil – 008 – 2013 83 According to the provisions of the Transporter Manual: • the Quality of the Hydrocarbon set forth in this Attachment, corresponds to the quality that the final blend of Crude Oil to be delivered by the SENDER must have. In the event that the Crude Oil delivered by the SENDER does not meet the Hydrocarbon Quality set forth in this Attachment and that it requires the purchase of diluents to make blends or any other type of expense to make its transportation feasible, the SENDER must request the approval of CENIT before the Delivery for transportation by CENIT. • It is the responsibility of the SENDER to guarantee that it has the right to deliver or to make others Delivery in its name the Crude Oil that CENIT receives at the Point of Entry. The SENDER will hold CENIT harmless in good fait, released for responsibility for any claim, action or damage that could arise from lawsuits, claims or administrative, judicial and extrajudicial actions of third parties that dispute the ownership or possession of the Crude Oil being Transported. • CENIT reserves the right to receive or not the Crude Oil Owned by the SENDER that does not meet the minimum values specified; in case that it receives it, the SENDER will pay to the Transporter the costs incurred in the analysis and in the eventual treatment of said Crude Oil to bring it to the specifications required or to implement the scheme required for its transportation. DC – Contrato de Transporte de Crude Oil – 008 – 2013 84 • CENIT reserves the right to request, reject or approve the injection, at any point of the Pipeline of products such as corrosion inhibiters, fluidity point depressors, friction reducers or any other additive on the Hydrocarbon to be transported. The SENDER will pay CENIT the costs incurred in the analysis and in the eventual treatment of this Hydrocarbon to bring it to the specifications required or to implement the scheme required for its transportation. • CENIT reserves the right to transport the Crude Oil Owned by the SENDER delivered by the SENDER that exceeds the limits determined by the Transporter for organic chloride, sand, dust, dirt, glues, impurities, other objectionable substances or other composites with physical or chemical characteristics that, in the exclusive determination of the Transporter, can mean that the Hydrocarbon is not easily transportable, may damage the Pipeline, or may interfere with the transportation and the delivery. The SENDER will pay CENIT the costs incurred in the analysis and in the eventual treatment of this Hydrocarbon to bring it to the specifications required or to implement the scheme required for its transportation. • The Transporter, acting in a reasonable manner and in good faith, will have the right to suggest any change of the minimum quality specifications of the Crude Oil Owned by the SENDER, from time to time, according to the operational practices, which may be necessary or adequate, including, but not limited to, to prevent material damages or the material degradation of the Effective Capacity of the Pipeline, to prevent personal injuries or damages to the property or the environment. Any change of specification must be subject to an express written agreement of the Parties. DC – Contrato de Transporte de Crude Oil – 008 – 2013 85 DC – Contrato de Transporte de Crude Oil – 008 – 2013 86 Description Version Date of Approval by the Board of Directors Document Creation 25 February 2013 DC – Contrato de Transporte de Crude Oil – 008 – 2013 87

Calculation of the Volumetric Compensation for Quality. The Volumetric Compensation for Quality is a process independent from the monthly balance of the system per senders. This process is made after making said monthly balance official, and the adjustments generated by the process will be included in the monthly balance of the Month of Operation for which the adjustments of the Volumetric Compensation for Quality were figured out. The steps to be followed in the calculation of distribution of volumes in the Volumetric Compensation for Quality are shown in Illustration (3). DC – DC- Crude Oil Transportation Agreement – 018 – - 009 - 2013 91 93 § Determine deliveries per Sender (Original Barrels = Ei § Determine the price of the currents that converge (Qi = $ USD / BBL) x Ei § Calculate the fraction of the cost fir each sender (F. C. = Qi / Q T § Calculate the Equivalent Barrels per Sender (B. Eq. = Original Bls x F. C) § Calculate Adjustments CVC = Equivalent Barrels – Original Barrels) Illustration 3 – CVC Calculation Scheme Where: Ei = Deliveries per sender in the entry node Qi = Price of the currents that are delivered in the entry node F. C. = Percentage of the ratio between the price of the deliveries per sender and the total price of the currents of all senders DC – DC- Crude Oil Transportation Agreement – 018 – - 009 - 2013 92 94 Sediment and water or particles Not to exceed 0.5% in volume Sediments – ASTM D 473Water – Xxxx Xxxxxx API at 60 ºF Higher than 18 API degrees, but lower than 50 API Decrees D 1298 Viscosity @ the temperature of reference Not to exceed 300 cSt at 30 ºC ASTM D 445 or D 446 Vapor Pressure Not to exceed 11 lb / square inchReid Vapor Pressure ASTM D 323 Receipt Temperature Not to exceed 120 ºF Salt contents 20 PTB ASTM D 3230 Fluidity Point Not higher than 12 ºC ASTM D 93 DC – DC- Crude Oil Transportation Agreement – 018 – - 009 - 2013 9395 1. Orito – Tumaco Pipeline (OTA):