Inventory tag-out Biodiesel Process Overview Reactor Glycerin Isolated Shipment Lot Shipping sample/test Purchasing Inventory Production Sales Shipping Customer Support Purchase Order Receiving Receiving Inspection per material spec Method Cut Tank “I” Reactor Source Reactor or Holding Tank MWT Monomer Weigh Tank Methanol Glycerin Recovery Methanol Bulk Methanol Biodiesel Recovery Glycerin Methanol Acid Wash Catalyst Feedstock Multiple Batches D6751 Reactor-F or I Multiple Bulk Storage Tanks INSPECTION POINTS Receiving List Checklist material dependent Glycerin Demethylation Glycerin sales or scrap Biodiesel Catalyst Sodium Methylate Water Step-01 Step-02 Demethylation of Biodiesel Step-03 Water Wash recovery Step-04a Step-04b Page 1 of 5 3/27/07 Shipment Lot Inspect Step-05 Batch Final Dry Step-04c Feedstock Soybean Oil COA

References 1.Purchase Order Listing of Quality Records Receiving & Unloading Tanker Trucks Purchase Order Procedure Receiving & Unloading Railcars Purchase Order Form Shipping Product by Tanker or Railcar 2.Receiving Purchase Order Procedure Bulk Receiving Checklist Receiving & Unloading Tanker Trucks Inventory Checklist for Bulk Receiving Receiving & Unloading Railcars Daily Receiving Report Log Railcar Checklist (Ship & Receive) 3.Receiving Inspection QA Lab Specification Transmittal Sheet (except shipment samples) Lab Spec Methanol Work Instruction for Providing Samples to QA Lab Spec Sodium Methoxide Lab Spec Soybean Oil 4.Step 01 - Reactor “I” Reactor Log Sheet Lab Spec-”I” Reactor Demethylation of Glycerin “I” Reactor Demethylation Log Sheet Lab Spec-”I” Reactor (In-Process) “H” Reactor Log Sheet Batch Step 1-Biodiesel “I” Reactor Glycerin Determination in Reactor Sample Batch Step 1-Biodiesel “H” Reactor Test Method Oil in Glycerin Biodiesel, “I” Reactor SOP Lab Spec Reactor (In-Process) Biodiesel, “H” Reactor SOP 5.Step 02 - Glycerin K-F Water Determination Method Lab Spec-”F” Reactor Demethylation of Biodiesel Lab Spec-”I” Reactor Demethylation of Glycerin Batch Step 2-Biodiesel Glycerin Page 2 of 5

References 6.Step 03 – Demethylation of Biodiesel Lab Spec-”I” Reactor Demethylation of Glycerin “I” Reactor Demethylation Log Sheet Lab Spec Demethylation of Biodiesel Cut Tank Log Sheet Batch Step 3-Biodiesel Demethylation by Cut Tank Cut Tank Demethylation Procedure 7.Step 04 – Blend Tank Lab Spec Blend (In-Process) Isolation of Bulk Tanks Ready for Shipment Batch Step 4-Biodiesel Wash by Blend Tank Recovery of Biodiesel from Water Wash Batch Card Citric Acid Solution Biodiesel Single or Double Water Wash SOP Batch Card Biodiesel from Water Wash 8.Step 05 – Shipment Lot QA Lab Specification Transmittal Sheet (except shipment samples) WI for Relative Density Determination Determining Significant Process Change WI for COA for Shipment of Biodiesel (D6751) Shipment Lot Tank Homogeneity Batch Step 5-Biodiesel Lot D6751 COA Work Instruction for Providing Samples to QA Isolation of Bulk Tanks Ready for Shipment 9.Shipment D Shipment & Billing of Finished Goods Procedure Lab-Ship Sample Test Open Sales Orders Form Shipping Product by Tanker or Railcar QA STS Definitions (for D6751 Shipment) Daily Shipping Report Log WI for COA for Shipment of Biodiesel (D6751) Pulling Samples from Tankers Loaded for WI for QA STS for Ship or Past 30 Days Sample Shipment Page 3 of 5

Document Approvals Role/Position (Normative) Owner: (informational) Approval Date COOBill McIlwain CTOTerry Boone Role/PositionReviewed By: QARavi Doshi HSEJohn Roberts PurchasingPeggy Davis Approved By: Document ControlJan Rector Instructions for filling out Document Approval Form 1. Identify the owner of the document who has technical authority for content. 2. Identify the authority required to review and approve (authority role). 3. Identify who acts within required authority for this release. 4. Approval date signifies that Document Control has received acceptance of approval. 5. Document Control has structural control as defined in Preparation & Release of Controlled Documents Page 4 of 5

Revision History DateRevision No.Modification Reason 10/31/0600Original issue 12/7/0601Multiple clerical updates. 1/12/0702Deleted tanks under Feedstock, added Tank 81; deleted tanks under Methanol Glycerin Recovery and Biodiesel Recovery; updated doc. number for H Reactor BC; Deleted inspection checkpoint under Glycerin. 3/27/0703Add References; deleted tank numbers & document numbers in flow chart Page 5 of 5