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' '1104/94 12 45 W619 453 2688 L,KUUN1)WA1hR 1hUi 444 LUNCUMD R.6 QU03/008 Harlin Knoll September 23, 1994 Page 3 ' Residual gasoline, used oil, and mixed oll and water were flushed from the product lines prior to removal The residual product was contained in three DoT-approved 55-gallon drums These drums remain on-sde pending proper waste charactenzation and disposal. Photographs of the demolition and line removal activities are preserded In Appendix 11- 2.3 Sampling Procedures On August 10, 1994, three sod samples, 1A-3, 18-3 and TSW 1-1, were collected along the excavated gasoline product line runs On August 12, seven additional samples. T2 through T8 were ' collected at depths of three to four feet below the piping (Figure 2) Samples WO-1 through WO-4 were collected from beneath the oil supply/used-oil line excavation at depths ranging from 3.5 to ' 5 feet Samples were collected under the direction of Mr Harlin Knoll of the San Joaquin County Environmental Health Dmsion following the sampling procedures and protocol summarized In Appendix 2 As required by Mr. Knoll, soil samples collected from beneath the gasoline product lines were analyzed for TPH as gasoline. BTM and total lead Samples collected from beneath the oil supply/used oil lines were analyzed for TPH., volatile organics, total oil and grease, PCBs, and CAM metals r These soil samples were field screened with a photoionization detector (PID) using headspace methodologies Results of the field screening ranged from 0 to 150 parts per million (ppm) The soil samples were sent by overnight delivery to GTEL Environmental Laboratories in Concord, California, ' for analysis 2.4 Analytical Results Four sod samples from the gasoline product line excavations contained concentrations of TPH, that ranged from 1 a to 5 8 milligrams per kilogram (mg/kg) Six samples were below reporting limits (<1 mg/kg) for TPH, Benzene ranged from below reporting limits in 8 samples to 0.058 - Total lead ranged from below the reporting limit to 1a mg/kg. The results for the soil samples collected from the gasoline product line excavation are presented in Table 1. The EPA 413 2 analysis results indicated concentrations of total 01 and grease from 6 mg/kg to 460 mg/kg in samples collected from the oil supply/used oil line trench Total petroleum hydrocarbons as diesel and illi EPA 8010 compounds were below reporting limas. Polychlorinated biphenyls were below reporting limits Pesticide concentrations of 2.3 and 1 3 micrograms per kilogram of 4,4-DDE and 4,4-DDD, respectively, were detected in sample W02-3.5. Results for soil ® GROUNDWATER 12saGA&Wr TECHNOLOGY -