ARCHIVED REPORTS_ROY'S AUTO - HISTORICAL (2)

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Two splits of this sample were treated with portland cement and a pozzolanic fly ash/hydrated lime amendment. However, these were not submitted for analysis due to the low STLC lead concentration in the control sample. The results of this additional sampling were presented in the letter report Results of Supplemental Soil Sampling dated August 21, 1997. Field notes and laboratory data sheets were included in the report. 6.4 Additional Soil Sampling--October 1997 Due to the low concentrations of lead detected in the bulk sample collected in July, additional bulk samples were collected from two locations within the impacted area. The chosen locations were anticipated to provide samples containing the highest lead concentrations in the impacted area. On October 29, 1997, a backhoe was used to collect bulk soil samples at locations BSB and BSC from the depth interval of approximately 1 - 1.5 feet. Discrete samples were also collected from both locations at depths of 2, 3 and 4 feet. The sampling locations are shown on Figure 2. The bulk samples were split into several aliquots for future treatment testing, if indicated. Samples were submitted to APPL for analysis. The lab was instructed to analyze BSB-1.5'- Control for total lead and soluble lead and sample BSB-3' for soluble lead only. The other samples were held pending results. After obtaining these results, the laboratory was instructed to analyze sample BSC-1.5'-Control for total lead and soluble lead. The concentrations of total lead in samples BSB and BSC at 1.5 feet were 44.7 and 43.7 ppm, respectively. The concentrations of soluble lead in samples BSB and BSC at 1.5 feet were 1.2 and 2.9 ppm, respectively. Soluble lead at 3 feet at location BSB was below the detection limit of 0.5 ppm. Laboratory results are summarized in Table 3. Field notes are included in Attachment A and laboratory data sheets are included in Attachment B. 7_0 Nature and Extent of Contamination No indications of contamination were found associated with the sump, the drainline or the leachpit. No indications of contamination were found associated with the random borings on the property, and the background lead level was established to be 5-20 ppm. Additionally, the lack of volatile hydrocarbons and observed rapid attenuation with depth indicate that contamination does not threaten groundwater quality. Elevated levels of hydrocarbons and lead are present in the septic tank liquid and sludge, but are not so elevated as to be characteristic of hazardous waste. None of the concentrations of total lead detected at the site exceeds the Title 22 Total Threshold Limit Concentration (TTLC) limit of 1,000 ppm for classification as hazardous waste. None of roys�cspcxte\wrom.ry 6 i