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♦1 1 inti c� ,r 4ti Ms Lon Duncan April 4, 2000 Page 3 of 6 soil identification and subjective evaluation for contamination A flame ionization detector (FID) was used to monitor the presence of volatile organic compounds in the soil Samples selected for analysis were sealed, labeled, and immediately placed in an iced cooler for transport to a state- certified analytical laboratory Soil samples were selected based on observations and field screening results "Grab" groundwater samples were also collected from each boring The samples were collected by driving the core sampler to the desired depth and exposing the screen to the bed within the formation A 0 17 inch diameter PTFE tube equipped with a stainless steel check valve was then inserted into the rods to the bottom of the of the sampler Water was extracted from the boring by creating a positive displacement effect within the tubing, forcing the water sample towards the surface where it was collected directly into sample containers Each completed boring was backfilled to the ground surface with neat cement grout No soil cuttings were generated All down-hole drilling and sampling equipment was decontaminated by washing with a laboratory grade detergent and rinsing with water Rinseate collected from decontamination procedures was disposed of by Fisch Soil and groundwater samples were submitted under chain of custody procedures to McCampbell for analysis RESULTS OF INVESTIGATION Subsurface Conditions Samples have previously been collected to a depth of approximately 31 feet bgs at the site Stratigraphy of borings MW4 through MW8 generally correlate to soils classified from previous site investigations Soils encountered consisted of lean clay with sand to lean clay from approximately 9 feet to 11/14 feet bgs, lean clay with sand, well graded sand, silty clay and silt from approximately 11/14 feet to 26129 feet bgs, well graded sand silt and clay from approximately 26/29 feet to 30 5 feet bgs, and silty clay to clay from approximately 30 5 feet to 37 feet bgs, the maximum depth explored Groundwater was initially encountered at a depths ranging from approximately 24 feet bgs (SB7) to 29 feet bgs (SB6), and generally recovered to a depths ranging from approximately 10 5 feet bgs (SB6)to 22 feet bgs (SB5) Boring logs are included in Attachment A No petroleum odors or discolorations were noted in borings SB4, SB5, SB7 or SBS Slight to moderate petroleum odors were noted in boring SB6, at approximately 20 feet bgs, and diminished with depth Soil discoloration was noted in the samples collected in SB6 at depths of 20 feet and 25 feet bgs FID readings of samples collected from boring SB6 ranged from non-detect at depths of 10, 15, 30 and 35 feet bgs to 3,000 parts per million (ppm) at a depth of 20 feet bgs FID readings from the remaining bonngs ranged from non detectable concentrations to 10 ppm Laboratory Analysis Soil and groundwater samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg) and diesel (TPHd) using EPA method 8015 modified, total recoverable petroleum hydrocarbons (TRPH) using EPA method 418 1, benzene,toluene, ethylbenzene and xylenes using EPA method 8020, volatile .t organic constituents (VOCs), and gasoline oxygenate additives using EPA Method 8260, and total lead using EPA Method 6010/200 7(soil)or 6010/239 2(groundwater) groundzelgabbardladd_bonng_rpt doc