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' Harlin Knoll September 23, 1994 Page 3 Residual gasoline, used oil, and mixed oil 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-site pending proper waste characterization and disposal Photographs of th e demolition and line removal activities are presented in Appendix 1 2 3 Sampling Procedures On August 10, 1994, three soil samples, 1 A-3, 1 B-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 1 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 Division 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, BTEX, and total lead Samples collected from beneath the oil supply/used oil lines were analyzed for TPHj, volatile organics, total oil and grease, PCBs, and CAM metals These soil samples were field screened with a photolonization 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 soil samples from the gasoline product line excavations contained concentrations o centrations of TPH9 that ranged from 1 8 to 5 8 milligrams per kilogram (mg/kg) Six samples were below reporting limits ' (<1 mg/kg) for TPH9 Benzene ranged from below reporting limits in 8 samples to 0 058 mg/kg Total lead ranged from below the reporting limit to 18 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 oil and grease from 6 mg/kg to 460 mg/kg in samples collected from the oil suppiy/used oil line trench Total petroleum hydrocarbons as diesel and all EPA 8010 compounds were below reporting limits 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 WO2-3 5 Results for sorl 1288GAS RPT 000 GROUNDWATER saw,#1288 slockton ❑�❑ TECHNOLOGY