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' Closure Summary Report • Gemelos Property (Paladin Center) ' 2421 East Holly Drive Tracy, California ' 1.0. INTRODUCTION AND SCOPE OF WORK ' In accordance with the request of Mr John Gemelos,Advanced GeoEnvironmental, Inc (AGE) has prepared the enclosed Closure Summary Report for the site located at 2421 East Holly Dnve, Tracy, I California (the site) The scope of work included monitoring ground water conditions at the site, collection and analysis of ground water samples, and preparation of this report ' A quarterly ground water monitoring event was performed on 18 November 1998 The location of the site is illustrated on Figure 1 -Location Map Structures, boring and monitoring well locations are shown on Figure 2 - Site Plan I 2 0. SITE HISTORY ' Two 10,000-gallon underground storage tanks (USTs) were removed from the property in April 1988 Approximately 100 to 120 cubic yards of soil were removed during the excavation Upon removal of the USTs, soil and ground water samples were collected from the excavation areas Laboratory results from the samples indicated that soil underlying the USTs was not impacted, but that hydrocarbon-impacted ground water was present at the site The analytical results for the UST removal samples are included in Table 1 On 29 June 1996, four soil borings were drilled on the site to a depth of fifteen feet bsg Boring B 1 was advanced west of the former UST dispensers and backfilled with grout to the surface A grab groundwater sample was collected from boring BI Boring 132 was advanced south of the former ' UST dispensers and was converted to monitoring well MW-3 Boring B3 was advanced northeast of the former UST dispensers and converted to monitoring well MW-2 Boring B4 was advanced on the northern edge of the site and completed as ground water monitoring well MW-1 IThe installation of MW-1 through MW-3 was performed using a truck-mounted CME 75-HT drill rig equipped with continuous flight, eight inch, hollow-stem augers Tan and gray, silty clay was encountered from surface grade to depths of approximately fifteen feet bsg in borings B4 (MW-1) and 133 (MW-2) Tan and gray, silty clay was encountered from surface grade to depths of six feet bsg in borings B I and 132 Gray, sandy gravel was encountered at depths between 10 and 15 feet bsg in borings B 1 and B2 TPH-g was not detected in any of the samples submitted to the laboratory for analysis However, •, ethylbenzene and xylenes were detected in a soil sample from 10 feet bsg in MW-I at concentrations of 0 005 and 0 007 milligrams per kilogram (mg/kg), respectively These detections may represent Advanced GeoEnNironznentai, Inc