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W Harlin Knoll <br /> November 14, 2000 <br /> Page 2 of 4 <br /> Califorma Registered Geologist Boring SB 1 X was advanced to a depth of approximately 47 feet <br /> below ground surface (bgs) Fisch utilized a truck mounted Geoprobe 5400 direct push ng to <br /> advance the boring and collect soil samples Prior to the commencement of direct push drilling a <br /> hand auger was utilized to advance boring SBTX to a depth of 10 feet in order to confirm that no <br /> underground utilities were present Soil samples for chemical analyses were collected at 5-foot <br /> intervals beginning at a depth of approximately 14 feet bgs Due to time constraints imposed by <br /> the City encroachment permit, no soil samples were collected between the depths of 31 and 45 <br /> feet bgs <br /> Samples were collected using a 1 3/4-inch diameter by 24-inch long core sampler The sampler <br /> was lined with clear acetate sleeves, affording soil identification and subjective evaluation of <br /> contamination A flame ionization detector (FID) was used to monitor the presence of petroleum <br /> constituents in the soil Five soil samples from boring SB1X were sealed, labeled, and <br /> immediately placed into an ice chest cooled to a temperature of approximately 4° Centigrade for <br /> transport to a state-certified analytical laboratory The selection of soil samples for analysis was <br /> based on observations and field screening results, and approved by Mr Harlin Knoll of <br /> PHS/EHD <br /> A "grab" groundwater sample was also collected from boring SB1X To collect the water <br /> sample, a small diameter PVC well casing with 10 feet of screen was inserted to the bottom of the <br /> boring A section of 0 17-inch diameter PTFE tubing equipped with a stainless steel check valve <br /> was then inserted into the well casing The groundwater sample was collected by creating a <br /> positive displacement effect with the tubing and dispensed immediately into appropriate glass <br /> containers The containers were then labeled and placed into an ice chest cooled to a temperature <br /> of approximately 4° Centigrade <br /> The completed boring was backfilled to the ground surface with neat cement grout Soil cuttings <br /> generated by hand augering were disposed of by Fisch No soil cuttings were generated during <br /> drilling by direct push All down-hole drilling and sampling equipment was decontaminated by <br /> washing with a laboratory grade detergent and rinsing with water Rinseate collected from <br /> decontamination procedures was disposed of by Fisch Soil and groundwater samples were <br /> submitted under chain of custody protocol to Argon Laboratories, Inc (Argon), a California <br /> state-certified hazardous waste testing laboratory (FLAP 2359), for analysis <br /> Results of Investigation <br /> Native soil consisted of silty clay from the ground surface to approximately 10-14 feet bgs, well <br /> graded sand from approximately 10-14 feet bgs to approximately 21-24 feet bgs, silt with some <br /> sand and gravel from approximately 21-24 feet bgs to at least 31 feet bgs, and lean clay from <br /> approximately 45 to 47 feet bgs No soil samples were collected between the depths of <br /> approximately 31 and 45 feet due to time constraints imposed by the City encroachment permit <br /> Groundwater was initially encountered at approximately 31 feet bgs, and rose to approximately <br /> 30 feet bgs within the boring <br /> Knowles hwn/reporUOgrn2OW doa <br />