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Table 2 GROUNDWATER MONITORING DATA Quiz Grocery 4491 !last Durham Ferry Road Tracy. California (me 2of2) Well/ Elevation Depth Elevation Sample of TOC to of Water Ethyl- Total Humber Date (Datum is MSL) Water (Datum 1a NSL) Product TPHO Benzene Toluene benzene Xylenes Observations Removal MW-3 09/04/91 97.93 8.67 89.26 <50 <0.5 <0.5 4.5 <O.5 No Product or Sheen NA MW-3 10/31/91 10.10 87.83 NS ?:s N5 NS NS No Product or Sheen NA M4-3 10/20/91 10.62 87.31 :Is VS N5 NS NS Na Product or Sheen NA MW-3 04/09/92 14.35 83.58 asp 9.0 <0.5 <0.5 <0.5 No Product or Sheen NA MW-3 07/10/92 12.36 85.57 <50 <0 5 0.0 40.5 <0.5 No Product or Sheen NA MW-3 01/07/93 15.03 82.90 NS ,.S NS NS NS No Product or Sheen NA MW-3 04/07/93 15.10 82.83 <50 <0.5 <0.5 <0.5 <0.5 No Product or Sheen NA MW-3 12/30/93 14.38 83.55 <50 <0 3 <0.3 <0.3 <0.3 No Product or Sheen NA MW-3 03/09/94 15.39 82.54 a50 <0.3 <0.3 <0.3 4.3 No Product or Sheen NA MW-3 08/01/94 10.05 87.88 Qs CIS HS NS NS No Product NA MW-4 08/01/94 **99.30 11.98 87.32 CIS 0s NS HS NS No Product or Sheen NA NW-5 08/01/84 **98.69 11.56 87.13 t;S CIS NS NS NS No Product or Sheen NA MW-6 08/01/94 **98.75 11.40 87.35 tZ NS NS NS NS No Product or Sheen NA MW-7 08/01/94 **99.45 12.01 87.44 CIS C'S NS NS NS No Product or Sheen NA Domestic Well 09/04/91 NM NM NM 450 <0.5 <0.5 <0 g <0.5 NM NA 01/07/93 NM NM NM <30 <0.5 <0.5 <03 <0.5 NM NA 04/07/93 NM NM NM <50 c0 5 <0.5 <0.5 <0.5 NM NA Analytical results in parts per billion (ppb) Measurements In feet below top of casing TOC = Top of casing MSL = Mean sea level TPH9 = Total petroleum hydrocarbons as gasoline S e Sheen NS a Not sampled NM = Not measured NA a Not applicable * a Elevation corrected for presence of floating product ** = Preliminary Survey Data Collected on 08/01/94 Data collected before December 30, 1993 from Delta Environmental Consultants, Inc. R-081694 FNL