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Artesian Environmental Consultants measured hydrocarbon thickness in MW -1 on March 16, 1992 to be 1 82 feet Groundwater flow direction on March 16, 1992 was to the southeast Water depth was measured on March 16, 1992 for MW -1 through MW -3 at 32 5, 32 7 and 32 4 feet below ground surface, respectively Artesian Environmental Consultants (Artesian) drilled three soil borings, B-1 through B-3, on the property on May 1, 1992 The soil borings B-1 through B-3 were drilled to depths of 45, 45 and 43 feet, respectively, below ground surface All three borings were drilled into native material All three borings, B-1 through B-3 were subsequently converted into monitor wells MW -4 through MW -6, respectively Shallow groundwater was encountered in all the wells at approximately 32 feet below ground surface The soils were logged by a project geologist under the supervision of a California - registered geologist Soil samples were collected at least every 5 feet for lithologic, hydrologic and characterization and possible chemical analysis The soils were screened with a photoionization detector (PID), an instrument to detect organic vapors Using a PID, organic vapor was not detected in the soil borings Soil Analy5i Soil samples were below detection limits (ND) for total petroleum hydrocarbons as gasoline (TPH-g) and diesel (TPH-d) Borehole B-1 contained 7 7 ppb and 18 ppb toluene and xylene respectively, at a depth of approximately 6 0 - 6 5 feet BGS At approximately 11 0 - 116 feet BGS, B-1 indicated 8 1 ppb total xylenes Borehole B-2 had 7 3 ppb total xylenes at approximately 110 - 115 feet BGS All other values for B-2 were ND for all samples and analyses Borehole B-3 contained 5 7 ppb for benzene at approximately 6 0 - 6 5 feet BGS All other values for B-3 were ND for all samples and analyses roundwater Analvsi Groundwater samples were below detection hnuts (ND) for total petroleum hydrocarbons as gasoline (TPH-g) and diesel (TPH-d) with the exception of the groundwater monitoring well water in MW -3 MW -3 contained 650 parts per billion (ppb) diesel, however, this value reflects the presence of long chain hydrocarbons, which were observed in the diesel range but do not have the characteristic diesel pattern Groundwater monitoring well MW -1 contained 12 ppb toluene All other groundwater monitoring well samples' were below detection limits for BTEX Groundwaler Gradien. The monitor wells were surveyed relative to each other The static water level measured on April 15, 1992 ranged from 5 12 to 5 21 feet below ground surface The groundwater flow direction was to the west southwest at a gradient of 0 0025