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a LKerw#WVJenks/CFdlton Mr. Tom Terrill Reynolds and Brown 23 January 1987 Page Six Results of the analyses of soil samples are summarized in Table L 1. 1 . Laboratory reports of soil sample analyses are presented in Attachment C. Petroleum hydrocarbons were not detected in -- any of the soil samples analyzed. Three of the four soil sam- ples analyzed for volatile: gasoline constituents contained toluene, in concentrations ranging from 13 to 43 ug/Kg (parts per billion) . Results of analysis of groundwater samples collected from the monitor well are presented in Table 1 .2. Laboratory reports of these analyses are presented in Attachment C. Neither petroleum hydrocarbons nor volatile gasoline constituents were detected in the groundwater samples or the field blanks. CONCLUSIONS Based on information derived from the previously described field investigation and laboratory analyses for this site, the follow-- Ling conclusions can be drawn. 1) Elevated levels of organic vapors were not detected by head- space analysis of soil samples at the time of collection. 2) Petroleum hydrocarbons were not detected by laboratory anal- ysis of soil samples from above and below the water table. Petroleum hydrocarbons were not detected in the groundwater sample from well MW1, although groundwater at the site was detected within one foot of the tank bottom. 3) Toluene was detected in three of the four soil samples anal- yzed for volatile constituents typically found in gasoline. The concentrations detected ranged from 13 to 43 mg/Kg L (parts per billion) . Toluene was not found in the groundwater sample collected from well MW1. 4) The toluene detected in soil samples apparently has not been L introduced to soil from leakage of product from the under- ground tanks, since other typical volatile constituents of gasoline were not detected in soil samples. The source of toluene in soil samples cannot be identified from the infor- mation obtained from this investigation. Toluene may have been introduced in soil samples from use of herbicides at the site prior to paving, or from previous use of toluene as L a solvent at the facility. We recommend that Reynolds and Brown investigate the past uses ( i€ any) of toluene at the facility. However, we note that concentrations of toluene L