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Work Plan For Additional Subsurface Investigation - Chevron Service Station #9-3232 March 26, 1999 evaluate groundwater conditions. If subjective field evidence is encountered indicating hydrocarbon impact, the proposed borings may be advanced deeper than 60 feet bgs, or additional borings may by advanced. Site conditions will be reviewed with and permission obtained from SJCPHS-EHD prior to advancing additional borings. To implement this scope of work, GR proposes the following four tasks: Task 1. Pre-field Activities GR will update the site-specific safety plan, and will obtain the necessary soil boring permit from SJCPHD-EHD. USA will be notified at least 48 hours prior to initiating fieldwork. A private line locator will be contracted to clear the boring locations. Task 2. Soil Borings GR will advance four soil borings to a depth of 60 feet bgs at the locations shown on Figure 2. The borings will be advanced by a California-licensed well driller using a GeoProbee or similar equipment that advances the boring equipment hydraulically. A GR geologist will monitor the field activities and prepare a log of the boring. Soil samples for chemical analysis will be collected at 5-Foot intervals. Soil samples will be collected with a 1 -inch diameter split spoon sampler lined with clean acrylic or brass tubing. Selected soil samples will be submitted for chemical analysis as described in Task 3 . Upon completion all borings will be filled to ground surface with neat cement. The GeoProbeg equipment does not generate soil cuttings. Water used in cleaning the drilling equipment will be placed in a properly labeled drum and stored at the site pending disposal. Integrated Wastestream Management (I WM) will transport the drummed water to McKittrick Waste Management for proper disposal . Task 3. Laboratory Analyses Soil samples will be submitted for chemical analysis at Sequoia Analytical, 'a California state- certified Hazardous Material Testing Laboratory (ELAP # 1210, # 1271 , and # 1624). Soil samples will be analyzed for TPHg by the DHS LUFT method, and for benzene, toluene, ethylbenzene and xylenes (BTEX) and MtBE by EPA Method 8020. Task 4. Report Preparation Following receipt and analysis of all data, a report will be prepared which summarizes the procedures and findings associated with this investigation. This report will be submitted to Chevron for its use and distribution. PROJECT STAFF Mr. Stephen J. Carter, a Registered Geologist in the State of California (R.G . No. 5577), will provide technical oversight and review of the work. Mr. Greg Gurss, Senior Project Manager, will supervise implementation of field and office operations. GR employs a staff of geologists, engineers, and technicians who will assist with the project. 346463.04-1 3