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�_�_Ar _ _ Working to Restore Nature _.t.r SE 24 3164 Gold Camp Drive, Suite 200 Rancho Cordova, CA 95670 Phone: (916) 852-6690 Fax: (916)852-6688 September 23, 1993 Mr. Scott Hooton BP-Oil Company ` North Western Division 16400 South Center Parkway, Suite 301 Tukwila, Washington 98188 Subject: Addendum to Work Plan 'for..Subsurface Investigation at BP Facility No. 11191, 1469 East Hammer Larne, Stockton, California. Mr. Hooton: At the request of BP Oil Company (BP),` RESNA Industries (RESNA) is submitting an addendum to our previous workplan(RESNA, October 13, 1992,Work Plan No. 17050.01). Additional work includes drilling one soil boring to approximately 50 feet below grade. The location of the project site is shown on the Site Vicinity Map (Plate 1). "The location of the proposed soil'boring is shown on the Generalized Site Plan (Plate 2). During December 1992, four soil borings were drilled at the site. Groundwater was not encountered in the soil borings. Gasoline hydrocarbons were detected in soil samples collected from boring B-4, near.the southern region of the northwestern dispenser island. Benzene concentrations ranged from 0.025 to 0.088 parts per million. TPHg concentrations were below laboratory detection limits. The proposed additional soil boring is to delineate residual hydrocarbons detected soil boring B-4. RESNA will conduct the following tasks: o Contact Underground Service Alert at least 48 hours before drilling to delineate public utility lines. o Observe drilling of one 8�inch-diameter soil boring to approximately 50 feet below surface grade, or until first.detected groundwater. The soil boring will be located near boring B-4. Drilling will be performed by a licensed well driller. o Collect relatively undisturbed soil samples at 5400t intervals from the boring,identify the samples using manual and visual methods, and classify the samples according to the Unified Soil Classification System. 123013-iw