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removals provide much les drilled before and after the tank s were drilled 2.4.2 Baring samples asoline releases $°ring Providing Soli samples collected frarn borings mao0,bout thefade and extent of the g distances fzom the pits, be additional information k Pis at both sites, as well as at various etroleum hydrocarbons can e throUgh the former tank P lateral distribution of p gasoline extended data from which the vertical and prior to remediation, go distances of 50 laboratory the Chevron site indicate that p 2D feet and outward estimated. The data from it to a depth of mote than m the former tank p 1 sample contained detectable concentrations of any y downward fro t the Kwikee site, very few sol p I feet or more. A MW-3 hydrocarbons,and concentrations were near the detection limits- line MW-1, gasoline hydroc 4, SB5, SB6, SB , SBI, SB2, SB -1.1,H_g concentrations were rovided TPH-g data for borings the tank Pit area, concentration in SEC-ov, Inc. p at the Chevron site. in MW-6, and MW-7 per million), but reached a et and 17 feet. A samPie MW-4, 3ASsof about 13 feet and elevated generally between 60 and 650o� p15 at depth W-6 also contained an s of 4,300 rngTkg fro;n the tar& pit in M Fi are 3, crass sections these boring 50 feet away at a depth of 17 feet) ( g collected more that drocasbous(1,400 mg/kg in soil ation of gasoline by e spaced at vertical distances of e0 tent of TPI-1-9 som concentration les wver P sand th A-A, and B-B') However' same e depths in all boring available to Upgradient Environmental at this time . borings, sa data are not avail at these som P cannot be mapped with the it and was sampled almost the tank pit C-C,}, and TPH_g boring GP-l at the Kwikee site re drill cross sections A were analyzed, despite In contrast, 20 to 35 feet (Figure les that w only benzene, continuously from it samples (see".()"2.4.1) were ions were below the detection 11ed n the tank p the samples o f 0.33 m9 19 ' cancentrat and MTBE, at a concentration the elevated concentrato58 and 0 025 mg/kg' six soil samples le KF-5-11' is the only ane of the twenty- above at concentrations of 0• further, same 2.98 nig) at Table 2) at the Kwikee site that contained of ac were sampled detected inriP-1 form boring GP-3, and GP-4, al that have been analyzeds GP-2, it. A few samples This includes bonng ar tert-Butanol (TBA). but the detection limit. Thl et or less and were located within ,5mthanol, O t P land TBA vertical intervals of 5 f �ylbenzene, xyleneexcept for fnethano s contained benzene, "-1 p� per ten million) lower than those from these boring 0.1 mg/kg( 444 ppm)= concentrations were all less than W-6 1 arbon concentrations in soil at Kwikee Chevron we11M from the lIence, petroleum hydros h fpl�-g eoncentm and the high it cannot be attributed to a release at the former Chevron site, Kwikee tank pit, The same can be said for the within 15 feet contained,no TPI-1-9, which is located about ringsfrom the well MW-7, which is located 40 feet from the Kwikee UST's, when m in Chevron w more moderate concentration (60 PPm) Kwikee tank pit. also illustrative of the history of the fuel release at 2.4.3 Groundwater Samples e Chevron site areles from MW-1 and compares les from th oundwater same oandwater Groundwater same lots the TPH-g concentration in gr d concentrations at site.Figure 8 p time.By the time this first well wasd drilled ang s that oundvvater over it to the depth to gracted at a cancentratran of 14,000 parts p at MW-1 was already imp 9