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3,1 January 2000 <br /> AGE-NC Project No 96-0235 <br /> Page 2 of 4 _ } <br /> One boring will be advanced approximately 10 feet southeastofMW-2 to a depth of 60 feet bsg <br /> Due to the proximity of previous borings, soil samples will not be collected The boring will be <br /> completed as a two-Inch diameter In-situ air sparging well with a screened Interval Installed from <br /> 60 to 55 feet bsg The filter pack will be Installed from 60 to 53 feet bsg A bentonite plug will be <br /> installed from 53 to 50 feet bsg and the boring backfilled to near surface grade with portland cement <br /> One boring will be Installed approximately 15 feet east of MW-2 to a depth of 50 feet bsg and <br /> completed as a four-Inch diameter ground water extraction well with screened casing installed from <br /> approximately 50 to 30 feet bsg <br /> � 4 A <br /> Procedures for the advancement of the borings and the Installation of the wells were described In the <br /> Monitoring Well Installation Work Plan -March 1998,prepared by AGE The dual-completed well <br /> design Is Illustrated on Figure 3, the spargmg well design Is Illustrated on Figure 4, extraction well <br /> designs are Illustrated in Figure 5 and 6 The proposed well locations are depicted on Figure 2 <br /> 3 2 SOIL SAMPLE ANALYSES ` <br /> Selected soil samples will be analyzed by a State of California Department of Health Services <br /> (DHS)-certified laboratory for the following constituents <br /> • Total petroleum hydrocarbons quantified'as gasoline (TPH-g) and diesel (TPH-d) in <br /> accordance with EPA Method 8015 Modified/5030, <br /> • Volatile aromatics (benzene, toluene, ethylbenzene and xylenes BTEX) and methyl tert- <br /> butyl ether (MTBE) in accordance with EPA Method 8020 <br /> r <br /> Selected soil samples collected near the UST cluster area may also be analyzed for <br /> • Fuel oxygenates, di-Isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), MTBE, <br /> tertiary-amyl methyl ether (TAME) and tertiary butanol (TBA) in accordance with EPA r <br /> Method 8260 <br /> To determine the potential for natural degradation or enhanced biodegradation of contaminants, <br /> selected soil samples will be transported to A Keith Kaufman and analyzed for physicochemical =� <br /> properties and bioenumeration { <br /> Sample selection and analyses will include input from the PHS-EHD <br /> , <br /> ,i <br /> Advanced Geo Envi ron mental,Inc <br /> w <br />