ARCHIVED REPORTS_ROY'S AUTO - HISTORICAL (2)

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on Figure 2. The samples were submitter) to Argon Laboratories (FLAP Cert. #1873) for one or more of the following analyses: TPHg, TPHd, TRPH, BTEX, Volatile Organic Compounds (VOCs), total lead, soluble lead and bioassay. All analyses were performed using approved methodologies (EPA Methods and Standard Methods). Due to questionable soluble lead analytical results at locations A, B, and C, additional samples were collected from a depth of 1 foot on March 24, 1997. The resampling locations are identified on Figure 2 as AA, BB, and CC. These samples were analyzed by Agricultural & Priority Pollutants Laboratories (APPL, ELAP Cert. #1312) for total lead and soluble lead. Moderately elevated concentrations of petroleum hydrocarbons (200 to 16,000 parts per million [ppm]) were identified in the samples collected from a depth of 1 foot at locations A, B, C, and D. These locations are extensions of the "contaminated" areas identified by Kaldveer as Areas I, H, and H. With the exception of 4.4 ppm TPHg at B-1', none of the samples contained detectable concentrations of TPHg or TPHd. The only BTEX constituents detected in these samples were very low levels of toluene and xylenes in sample B-1'. Samples collected from depths of 5 feet at these locations contained petroleum hydrocarbon concentrations reduced by an order of magnitude or more (< 1.0 to 300 ppm). Somewhat elevated concentrations of lead were also reported in the samples collected from 1 foot at locations A, B, C, and D (46 to 200 ppm). Soluble Threshold Limit Concentration (STLC) lead levels at locations A, B, and C ranged from 7.9 to 22 ppm. Essentially complete attenuation of total lead with depth was apparent in the samples from 5 feet where concentrations ranged from 7 to 16 ppm. These are essentially equivalent to background levels (approximately 5 to 20 ppm). Duplicate samples collected at locations A, B, and C (labelled AA, BB, and CC) at a depth of 1 foot contained total lead at concentrations ranging from 66.3 to 94.7 ppm and STLC lead concentrations ranging from 1.8 to 8.3 ppm. Laboratory results are summarized in Table 1. The results of this phase of investigation were reported in the Soil Sampling Report - Results of Investigation, dated April 18, 1997. Field notes and laboratory data sheets were included in the report. 6.2 Septic Tank Sampling--March 1997 On March 27, 1997, under the supervision of PHS/EHD, liquid (RT-ST water) and sludge (RT- ST sludge) samples were collected from the septic tank at the location shown on Figure 2. Using a jackhammer, the septic tank was exposed and a sampling hole was opened. The liquid sample was collected through the hole using a clean, disposable bailer. The sludge sample was collected just above the bottom of the tank by using a 3/4-inch diameter polyvinyl chloride (PVC) pipe as a coliwasa. Samples were analyzed by Argon for TPHg, TPHd, TRPH, VOCs, total lead and soluble lead. roys�repons\summary 4