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TABLE 6 <br />SUMMARY OF GROUNDWATER SAMPLE ANALYSES <br />(U91L) <br />Well No. <br />Date <br />Deptht <br />Gases <br />Benzene <br />Toluene <br />benzene <br />Xylene <br />MW -1 <br />3-17-93 <br />6814 <br />ND <br />ND <br />ND <br />ND <br />ND <br />6-28-93 <br />66 22 - <br />ND <br />ND <br />ND <br />ND <br />ND, , <br />10-18-93 <br />6751 <br />ND <br />ND <br />ND <br />ND <br />i <br />1-14-94 <br />6518 <br />ND <br />ND <br />ND <br />ND <br />TABLE 6 <br />SUMMARY OF GROUNDWATER SAMPLE ANALYSES <br />(U91L) <br />Well No. <br />Date <br />Deptht <br />Gases <br />Benzene <br />Toluene <br />benzene <br />Xylene <br />MW -1 <br />3-17-93 <br />6814 <br />ND <br />ND <br />ND <br />ND <br />ND <br />6-28-93 <br />66 22 - <br />ND <br />ND <br />ND <br />ND <br />ND, , <br />10-18-93 <br />6751 <br />ND <br />ND <br />ND <br />ND <br />ND <br />1-14-94 <br />6518 <br />ND <br />ND <br />ND <br />ND <br />ND <br />4-15-94 <br />6325 <br />ND <br />ND <br />ND <br />ND <br />ND <br />MW -2 <br />3-17-93 <br />6722 <br />ND <br />3 7 <br />ND <br />ND <br />11 <br />6-28-93 <br />6474 <br />ND <br />ND <br />ND <br />ND <br />ND <br />10-18-93 <br />6606 <br />ND <br />ND <br />ND <br />ND <br />ND <br />1-14-94 <br />6368 <br />ND <br />ND <br />ND <br />ND <br />ND <br />4-15-94 <br />6174 <br />ND <br />ND <br />ND <br />ND <br />ND <br />MW -3 <br />3-17-93 <br />6749 <br />ND <br />ND <br />ND <br />ND <br />ND <br />6-28-93 <br />6496 <br />ND <br />ND <br />ND <br />ND <br />ND <br />10-18-93 <br />6616 <br />ND <br />ND <br />ND <br />ND <br />ND <br />144-94 <br />6394 <br />ND <br />13 <br />2 1 <br />ND <br />1 1 <br />1-14-94* <br />6394 <br />ND <br />ND <br />ND <br />ND <br />ND <br />4-15-94 <br />6210 <br />ND <br />ND <br />ND <br />ND <br />ND <br />P = parts per billion <br />* Rt&` Q5 +7�e', <br />eanalysed water sample.... [7GGee� f V <br />t %4easurements m feet <br />from MW -2 (B2-45, Table 3) All detected concentrations are lust above reporting limits and <br />should pose no health risk <br />GeoAudit estimates that only 10 to 20 cubic yards of hydrocarbon impacted soil remains at <br />the site The impacted soil has an average benzene/toluene concentration of 0 005 ppm or <br />less ' andhasshown no impact to groundwater Furthermore, any attempt at remediation of such a small volume of soil (and low level) would likely be ineffective and not cost efficient <br />5.2 Groundwater <br />S4 <br />NW <br />In the March 1993 sampling event, low concentrations of benzene and xylene were detected , <br />in MW -2. However, the presence of petroleum hydrocarbon impacted groundwater has not a <br />been confirmed in subsequent samplings In the January 1994 event benzene, toluene, and <br />xylene were initially reported in MW -3, but reanalysis of the sample did not confirm the <br />presence of detectable hydrocarbons <br />G-bV-1 s.� <br />l 6XI4 94/Md C11 QR <br />12 <br />