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i <br /> TABLE 2 <br /> ANALYTICAL RESULTS OF GROUNDWATER SAMPLES <br /> Lammersville School District <br /> 15555 Von Sosten Road, Tracy, California <br /> Well TPH as Ethyl- <br /> ID Date Gasoline Benzene Toluene benzene Xylene <br /> IMW-1 10-13-94 ND 21 052 15 14 <br /> MW-2 11-23-94 150 19 095 ND 3 7 <br /> MW-3 11-23-94 ND ND 093 N'D ND <br /> MW-4 11-23-94 ND ND 078 ND ND <br /> MW-5 10-13-94 ND ND ND ND ND <br /> MW-6 10-13-94 ND ND 087 ND ND <br /> MW-7 10-13-94 ND ND 11 ND ND <br /> MW-8 11-23-94 ND IT'D 054 ND ND <br /> MW-9 10-13-94 ND ND 063 ND ND <br /> MW-10 10-13-94 ND ND 089 ND ND <br /> p8/L = parts per billion(ppb) ND = None Detected <br /> Io v and <br /> Hydrocarbons in groundwater at the site have decreased significantly bet. een 992 1 .. <br /> 1994 In November 1994, TPH was detected only in NSW-2 at 150 ppb Furthermore, only <br /> very low concentrations of volatile organics (BTES X) were detected dining the 1994 <br /> samplings <br /> It appears that hydrocarbons at the site have either migrated beyond monitoring well <br /> locations or natural degradation has reduced concentrations to near or below detection <br /> limits However, since little or no hydrocarbons were detected in wells MW-5, MW-9 and <br /> MW-10 (down-gradient of the former hydrocarbon plume), it is not likely that hydrocarbons <br /> have migrated beyond those wells <br /> Groundwater at the site has not been investigated in two areas The first area is northwest <br /> of MW-3, the second area is between MW-1 and MW-8, near the middle of Hansen Road <br /> Tliere£ore, we recommend the drilling of one soil boring near each of the referenced <br /> locations, the locations are illustrated on Figure 2 One grab groundwater sample <br /> (Hydropunch) should be collected from each boring If field observations of the <br /> �I-S-1 A 6,u'wm8 <br /> SG94 07 1001 Cr-TAMMM%IL P QFZV12 9/ <br /> I <br /> E <br />