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i <br /> ... Mr. H. C. Winsor <br /> September 16. 1987 <br /> Page 3 <br /> developed by Armour Petroleum Service and Equipment Corporation <br /> (Armour Petroleum) of Vacaville, California, on July 22, 1987, by <br /> pumping. <br /> On July 15, 1987, while drilling Borehole B-1, the regular and super <br /> unleaded product lines and the super unleaded vapor ling: were <br /> ruptured. All gasoline flow to the pumps was immediately shut down, <br /> and rags were stuffed into the product lines to soak up the gaso- <br /> line. The City Fire Department and ARCO maintenance crews were <br /> notified. <br /> ARCO data indicate that the estimate of gasoline lost was between 15 <br /> and 33 gallons of regular gasoline and between 0 and 35 gallons of <br /> super unleaded gasoline. An Underground Storage Tank Release <br /> (Leak)/Contamination Site Report was filed with the County. The <br /> j ruptured lines were replaced on July 15, 1987, by W. F. Lewis <br /> Construction Company (Lewis Construction) . On July 16, 1997, all <br /> lines passed a pressure test conducted by Lewis Construction. The <br /> location of Borehole 13-1 was shifted slightly southwest. <br /> ! Site Geology and Groundwater Occurrence and Flow <br /> Site geology for the area determined from the borehole logs is shown <br /> -- on Figure 2. The sediments appear to be predominantly silt from the <br /> Y ground surface down to approximately 25 feet below ground surface <br /> 'i under the ARCO station, and down to approximately 45 feet below <br /> ground surface under American Savings. Beneath the silt layer, the <br />" sediments are predominantly sand. Groundwater occurs at approxi- <br /> mately 53 feet below ground surface in the predominantly sand layer. <br /> Groundwaterelevations obtained by BC on July 23, 1987, are <br /> z summarized in Table 1. <br /> Table 1. Groundwater Elevations, July 23, 1987 <br /> v' i <br /> i Top of casing Depth to water Water surface <br /> d Well elevation, feet surface, feet elevation,a feet <br /> R W-1 42.87 53.52 -10.65 <br /> W-2 42.94 53.58 -10.64 <br /> w-3 42.48 53.28 -10.80 <br /> W-4 43.06 53.38 -10.32 <br /> W-5 41.90 52.44 -10.54 <br /> -------- W-6-- ...---:---4'1.80------ 52 a 89----- -11.109 <br /> ---- — --- <br /> - - - <br /> aAbsolute elevations based on City bench mark 786 on the <br /> north*.:est corner of the Kettleman Lake and Hutc�ins Street <br /> intersection. Elevation of. bench mark 786 is 43.11 feet <br /> above sea level. <br /> i <br /> BROWN AND CALDWELL <br /> 723 S9 TREE! SACAAPIENTO.CA gtM4•19161463-012] - - <br />