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Mr. Dennis Catanyag San Joaquin County Environmental Health Department January 13, 2003 Page 2 Ethylbenzene was reported at 0.039 ppm in DI -1 and at 0.0077 ppm in the sample from DI -5. Xylenes were detected in 5 of the 8 dispenser is island samples with a maximum concentration of 0.57 ppm reported in DI -1. MTBE was reported in one sample (DI -7) at 0.015 ppm, and TBA was reported in one sample (LS -3) collected beneath the product lines. Other analytes were reported as non -detect. Stockpile Sampling and Disposal The soil over -excavated during the removal and replacement of the product lines and dispensers was stockpiled at the site pending disposal. One four-part composite sample (SP -1-4) was collected fi _ n the soil stockpile and two four-part composite soil samples were collected from the pea gravel ;.Lockpile. Stockpile samples were analyzed by Sequioa for purgeable hydrocarbons and BTEX by DHS LUFT, and for total lead by EPA Method 6010B. TPHg and BTEX compounds were reported in sample SP -14. No analytes were detected in samples SP -5-8 and SP -9-12, which were collected from the pea gravel stockpiles. The waste stockpiles was transported as non -hazardous waste to the Altamont Landfill and Disposal Facility in Altamont, California, by Dillard Trucking, Inc. Soil analytical data are summarized in Table 1. Soil sample locations are shown on Figure 2. Field and laboratory procedures are presented as Attachment A. Laboratory analytical reports and chain -of -custody documentation are presented as Attachment B. Waste disposal manifests are included in Attachment C. Field notes are included as Attachment D. Conclusions Based on the analytical data collected during the product line and dispenser upgrades, very low concentrations of ethylbenzene, xylenes, MTBE, and TBA are present in soil samples from beneath the dispenser islands. A very low concentration of TBA was reported in one of the soil samples collected beneath the product lines. URS recommends that no additional sampling be conducted at the dispenser and product line locations. Groundwater remediation will continue at the site. This report is based on data, site conditions, and other information that are generally applicable as of the date of the report, and the conclusions and recommendations herein are therefore applicable only to that time frame. Background information, including but not limited to previous field measurements, analytical results, site plans, and other data has been furnished to URS by Atlantic Richfield Company, its previous consultants, and/or third parties that URS has used in preparing this report. URS has relied on this information as furnished. URS is not responsible for nor has it confirmed the accuracy of this information. K:U5 BP ARCO\02093\Line Upgrade\1.011002.doc