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fli <br /> l `I <br /> mow vm ► <br /> 1 p� r Working to Restore Nature <br /> ri!0� <br /> 3164 Gold Camp Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> i Phone (916)852-6690 <br /> Fax (916) 852-6688 <br /> Ilhl <br /> October 14, 1993 <br /> Mr Chuck Carmel <br /> ARCO Products Company <br /> P O Sox 5811 <br /> 'h I San Mateo, California 94402 <br /> Subject Addendum to Work Plan for installation of Offsite Groundwater Monitoring <br />+ Well and Onsite Vapor-Extraction Well at ARCO Service Station No 548, <br /> 1612 Hammer Lane, Stockton, California <br /> tMr. Carmel <br /> At the request of ARCO Products Company (ARCO), RESNA Industries (RESNA) has <br />*(_I � prepared this addendum to Work Plan No 30004-4W, dated August 8, 1991 for installation <br /> of wells at the subject site The location of the site is shown on the Site Vicinity Map (Plate <br /> 1) The purpose of the work is to further assess the lateral extent of gasoline hydrocarbons <br /> in groundwater downgradient of the site and to assess the vertical extent of residual <br /> hydrocarbons in soil in the vicinity of a 78-gallon gasoline release that occurred March 10, <br /> 1993 <br /> RESNA will perform the following work upon approval of permits by the San Joaquin <br /> Public Health Services, Environmental Health Division <br /> } o Observe drilling of one 10-inch-diameter soil boring by a licensed driller to <br /> I approximately 45 feet below surface grade (bsg) or to first groundwater where the <br /> hydrocarbon release occurred and one 8-inch-diameter soil boring to approximately <br /> l 65 feet bsg or to 20 feet below the first groundwater downgradient of the site in the <br /> City of Stockton property Soil samples will be collected from the borings for <br /> laboratory analyses at approximately 5-foot intervals or where changes in sediment <br /> occur We will log the samples using visual and manual methods and classified <br /> according to the Unified Soil Classification System The locations of the wells are <br /> shown on the Generalized Site Plan (Plate 2) <br /> 30004-IOW <br />' I <br /> i <br />