ARCHIVED REPORTS_XR0005492 - Laserfiche WebLink

Home Browse Search

3.0 REMEDIAL SOIL SAMPLING AFTER TANK REMOVAL 3.1 Introduction iAt the time of the tank removals, soil samples were collected at each end of the tanks The results of sampling showed that hydrocarbon contamination was present in the bottom ofthe excavation with ' the highest levels reported along the south sidewall of the tank pit In addition, two grab water samples were also collected in the tank pit The grab water sample ' results are presented in Table 6 The sample from the diesel tank end(east end of tank pit)contained TPH-D and TPH-G levels of 97,000 and 1,900 µg/L, respectively The sample from the gasoline tank end (west end of tank pit) was also reported to have TPH-D and TPH-G contamination The ' levels of TPH-D and TPH-G were 16,900 and 24,000µg/L, respectively Benzene concentrations for the two samples were 5 7 (west sample) and 490 (east sample) ug/L MTBE reported for the grab water samples were 110 and 16,000 µg/L for the west and east samples, respectively Additional sampling was required by the inspector as part of the site remedial investigation Soil samples were collected along pipelines, from the tank excavation sidewalls, and beneath the dispenser ' islands The following sections discuss the additional sampling completed at the site 3.2 Sampling Methods Soil samples were collected from the side walls of the tank excavation and at various locations beneath pipelines and dispensers (see Figure 3 for sample locations) All sampling was completed ' under the direction of Ron Rowe, San Joaquin County Environmental Health For the samples collected along the pipelines and near the dispensers, a hand auger was used to dnII to sample depths The soil samples were obtained using a slide hammer Samples were taken in 2-m i d , 6-in long brass tubes The sample tubes were sealed at each end with Teflon sheeting and PVC end caps, labeled with sample number, date and time, and sampler's name All samples were then stored on ice and transported under chain-of-custody to a State-certified laboratory (McCampbell Analytical Lab and Mobile Chem Labs, Inc ) The soil samples were submitted for certified analyses of TPH-d, TPH-g, MTBE, BTEX and VOC's (EPA Method 8260) 3 3 Analytical Results Table 5 and 6 present a summary of the analytical results for samples collected during the tank removals The analytical reports from the state certified laboratories are included in Appendix A Table 7 presents a summary of the analytical results for samples collected from the remedial investigation Remedy, Inc, Interim Investigation and Remediation Report September 16 1998 Frank's One Stop 2072 W Yosemite Avenue 11anteca, CA 01511R RPI 6 I