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1 <br /> 1 <br /> . 28 January 1996 <br /> AGE-NC Project No 95-0144 <br /> Page 4 of 6 <br /> intervals and recorded on field sheets All purged water was stored in 55-gallon DOT drums on-site <br /> Stabilization data and field logs are included in Appendix B <br /> 1 <br /> 3 5 COLLECTION OF GROUND WATER SAMPLES <br /> For both sampling events (5 October and 20 November 1995), water samples were collected from <br /> each purged well using new disposable bailers Samples were transferred into 40-m1 EPA vials <br /> prepreserved with hydrochloric acid and 1-liter amber bottles Each sample was transported to a <br /> chilled container to MAI and analyzed for total petroleum hydrocarbons as gasoline (TPH-g), diesel <br /> (TPH-d), and motor oil (TPH-mo), and BTE&:X in accordance with EPA methods 80151n and 602, <br /> respectively The sample collected from MW-,18 was also analyzed for TRPH in accordance with <br /> EPA method 418 1 <br /> ' <br /> 36 SURVEYING <br /> On 29 November 1995, the casing elevations of all monitoring wells at the site were surveyed to the <br /> nearest 0 01 foot using a Nikon builders level (Table 1) All elevations were surveyed relative to <br /> monitoring well NlW-1 which was previously assigned an arbitrary ele,�ation of 12 85 feet based on <br /> ' the Stockton West topographic quadrangle map Surveyed elevations are included in Table 1 <br /> 4.0. FINDINGS <br /> 41 STRATIGRAPHY <br /> Fill matenal was present in each boring from surface grade to depths of s feet bsg Silt, silty clay and <br /> clayey silt were generally encountered in the borings from depths of 8 to 21 feet Sand was <br /> encountered from depths between 21 and 37 feet bsg (total depth) in borings MW-12, MW-13 and <br /> MW-18 and between depths of 21 and 34 feet in M'W-11 Clayey silt was encountered in MW-11 <br /> from 34 feet to 37 feet (total depth) <br /> No organic vapors were detected and no hydrocarbon odors were noted during the drilling of any of <br /> the soil borings Boring logs are presented as Appendix B <br /> 42 ANALYTICAL RESULTS OF SOIL SAMPLES <br /> No petroleum hydrocarbons were detected in any of the samples analyzed Analytical results are <br /> summarized on Table 2 The laboratory report (MAI, ID #56919 - 56921, 55875) and chain-of- <br /> 4 ' <br /> 1 , <br />