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MrS Santa Fe Pacific Pipeline Partners, L.P. J-6075.03 January 6, 1994 STOCKTON WORK PLAN Page 3 SCOPE OF WORK Hart Crowser will complete this work by performing the five tasks as described in the following sections. These five tasks are: Task 1. Augering and sampling three additional shallow soil borings; Task 2. Installation of an upgradient, B-zone groundwater monitoring well; Task 3. Preparation of an interim technical memorandum; Task 4. Conducting a field treatability test for soil remediation; and Task 5. Preparation of a RAP Task 1 - Hand Augered Soil Barings Under this task, this Work Plan will be submitted to the RWQCB and the San Joaquin County Health Department (SJCHD) for review. Following their review, the RWQCB and SJCHD comments will be incorporated and the Work Plan will be finalized prior to the initiation of field work. In addition, Hart Crowser will apply for the necessary soil boring and monitoring well installation permits as required by the SJCHD. This work will be completed using the Health and Safety Plan prepared by Hart Crowser for the previous investigation work at this site. The Health and Safety Plan is attached as Appendix A of this Work Plan. Total petroleum hydrocarbons (TPH) as diesel and gasoline were detected in the shallow soils between 0 and 10 feet below ground surface (BGS) in the area of the manifold/prover loop during the previous investigation. Hart Crowser will retain a licensed drilling company to hand auger two soil borings (EB-16 and EB-17) to further delimit the northern extent of the hydrocarbon impact in this area. One soil boring will be placed northwest of the manifold near the facility office and another will be placed approximately 100 feet north of the manifold. A third soil boring will be placed in the vicinity of monitoring wells M-4 and M-7 to delimit the northeast extent of the hydrocarbons detected in soil boring EB-15 during the previous investigation. The approximate locations of existing and proposed boring locations are shown on Figure 2. Each boring will be augered to a maximum depth of 10 feet or first encountered groundwater. According to previous groundwater data, groundwater levels vary seasonally at this site and were found to be approximately 10 feet BGS during the summer months.