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3164 Gold Carte Drive Defta Suite 200 Rancho Cordova,CA 95670-6021 EnvMoeenental U.S.A. Consdtaets,Inc. 916/638-2085 FAX:916/638-8385 April 22, 1999 Mr.Darin L.Rouse J;&JqV Exxon Company,U.S.A. 2300 Clayton Road,Suite 1250 APR 3 0 Concord,California 94520 1999 MEM, 41, Subject: Work Plan to Install Monitoring Wells and Soil Borings ENVIRONPERMIT/SERVICESMEN7ARSTM Former Exxon Service Station No.7-3708 2705 Country Club Boulevard Stockton,California Delta Project No.D093-809 Dear Mr.Rouse: Delta Environmental Consultants, Inc (Delta), has been authorized by Exxon Company, U.S.A. (mon), toNO Station No.7-3708 located at 2705 CountryClub Boulevard,S at Exxon Service Stockton, California. The proposed scope of work is to further assess the vertical and lateral extent of petroleum hydrocarbon impacted soil and ground water on-site,and to address San Joaquin County Public Health Service's (SJPHD) letter dated February 16, 1999 (Enclosure A). The location of the site is shown in Figure 1 and site features are illustrated in Figure 2. Field methods and procedures to be used by Delta to complete the proposed work are summarized in Enclosure B. This work plan presents the results of soil sampling performed at the site since August 1991. As requested in the SJPHD letter,soil borings are proposed in areas where the vertical extent of petroleum hydrocarbons has not been defined beneath the water table. According to San Joaquin County Flood Control maps for fall 1978, the depth to ground water may have been more that 20 feet below surface grade (bsg) in the vicinity of the site ' lett;? 'G►f30. Also, this work plan proposes the installation of monitoring weds on-site that wi�1'Se screened across the water table. High water table conditions during the past two years have submerged the existing monitoring well screens. project Background The subject site is an operating retail gasoline station located on a 1/2 acre parcel at the northwest comer of Ryde Avenue and Country Club Boulevard in Stockton, California. Elevation of the ground surface as the site is approximately 1 to 2 feet above mean sea level. The site slopes down towards the northeast and southwest comers from a slight topographic high across the center. In August 1991, Delta installed three ground water monitoring wells on-site MW-1 through MW-3 each to an approximate depth of 27 feet below surface grade (bsg). A quarterly ground water monitoring program at the site was initiated at that time. Chemical analyses on soil samples Providing a Competitive Edge