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101; 3164 Gold Camp Drive Delta Suite 200 *///4kRancha Cordova, GA 95670 Environmental 9161638-2085 Consultants,Inc. � �y�� FAX 9161638-8385 May 8, 1996 J U L 2 41996 Ms Marla Guensler DWRONMENTAL HEALTH PERMITlSEl2VICE5 Exxon Company U S A 2300 Clayton Road, Suite 640 Concord, California 94520 Subject Soil Excavation and Sampling Results Exxon Service Station No 7-3708 2705 Country Club Boulevard Stockton, California Delta Project No D093-809 Dear Ms Guensler Delta Environmental Consultants, Inc (Delta), has been authorized by Exxon Company U S A (Exxon) to observe the excavation of a new tank basin and collect confirmation soil and ground water samples during excavation activities at Exxon Service Station No 7-3708 located at 2705 Country Club Boulevard, Stockton, San Joaquin County, California The site is shown in Figure 1 and site features are illustrated in Figure 2 All field work conducted by Delta was performed in accordance to Delta's Soil Management Work Plan and Addendum to Soil Management Work Plan, dated October 27 and November 20, 1995, respectively Excavation of New Tank Basin On December 27 and 28, 1995, a representative from Delta was on-site to observe Walton Engineering of Sacramento excavate the new tank basin area Approximately 550 cubic yards of soil were generated during the excavation Following excavation activities, confirmation soil samples Tank Pit-1 through Tank Pit-4 were collected from the side walls of new tank cavity The limits of the excavation and the locations of the soil samples are shown on Figure 3 Additionally, a grab water sample (Pit Water) was collected from ground water which accumulated in the base of the excavation Soil and ground water samples collected on December 28 and 29, 1995, were submitted to Sequoia Analytical (a California-certified laboratory) for chemical analysis of benzene, toluene, ethylbenzene, and total xylenes (BTEX), using EPA Method 8020, and total petroleum hydrocarbons (TPH) as gasoline using EPA Method 8015 Modified Analytical results for soil samples collected on December 28, 1995, are summarized in Table 1 and analytical results for the grab water sample is summarized in Table 2 Copies of the laboratory analytical reports with chain of custody documentation are included in Enclosure A Overexcavation Activities On December 29, 1995, a Delta representative observed the overexcavation of the northern end of the new tank basin area Overexcavation was conducted to remove soil containing petroleum hydrocarbons Providing a Competitive Edge