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Mrg Santa Fe Pacific Pipeline Partners, L.P. J-6075.03 " September 14, 1994 Work Plan for Pilot Testing of Air Sparging Page 2 injection probe and some observation test probes. The pilot testing will focus on the area of M-1, the approximate center of the dissolved petroleum hydrocarbon plume. A more detailed description of the proposed scope of work follows. Task 1 - Well Permitting Following approval of the work plan,Hart Crowser will obtain the necessary well permits from the San Joaquin County Health Department. Task 2 - Installation of Air Sparging Probes and Vapor Probes In order to adequately monitor the air sparge pilot test,we will install one injection probe, two air sparge probes, and two vapor probes located within 20 feet of monitoring well M-1,for a total of 5 probes. The probes will be pushed into the ground with a hydraulic rig. The probes will be constructed of hollow steel rods extending at least five feet below where groundwater is first encountered. Approximately two feet of slotted screen will be exposed at the bottom of the probe. The probes will be completed above grade with a stovepipe for protection. Task 3- Air Sparge Pilot Test Air will be introduced through the air injection probe using a portable air compressor. The other probes will be used for monitoring. The air will be injected below the estimated effective overburden pressure to ensure that soil fracturing does not occur. A pressure relief valve will be installed on the air supply line. We will measure the pressure and rate of air injection in the injection probe. We will also monitor the air sparge monitoring probes for dissolved oxygen, dissolved iron, and oxidation reduction potential. The vapor probes will be monitored for volatile aromatic hydrocarbons (VOCs) with a photoionization detector (PID). Two to three air samples will be collected from one or both of the vapor probes,based on PID measurements. The samples will be submitted to an analytical laboratory for analysis of TPH-G and BTEX. Task 4 - Report Preparation The data collected from Tasks 1 through 3 will be summarized in a brief report which will include field observations,methods and procedures, laboratory results, our data analysis of the feasibility of bio sparging and a brief description of planned activities.