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4 _ _ <br /> " <br /> »-, Mr. H. C. Winsor <br /> I September 16. 1987 <br /> Page 3 <br /> 1 <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 line 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 /> i 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 /> r J ruptured lines were replaced on July 15, 1987, by W. F. Lewis <br /> Construction Company (Lewis Construction) . On July 16, 1987, all <br /> lines passed a pressure test conducted by Lewis Construction. The <br /> t location of Borehole B-1 was shifted slightly southwest. <br /> J - # Site Geology and Groundwater Occurrence and Flow <br /> ` Site geology for the area determined from the borehole logs is shown <br /> s on Figure 2. The sediments appear to be predominantly silt from the' <br /> ground surface down to approximately 25 feet below ground surface <br /> 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 /> Groundwater elevations obtained by BC on July 23, 1987, are <br /> summarized in Table 1 <br /> Table 1. Groundwater Elevations, July 23, 1987 <br /> Top of casing Depth to water surface <br /> Well elevation, feet surface, feet elevation,a feet <br /> W-1 42.87 53.52 -10.65 <br /> W-2 42.94 53.56 -10.64 <br /> Z W-3 42.46 53.28 -10.80 - <br /> t , <br /> LJW-4 43.06 53.38 -10.32 <br /> 3W-5 41.90 52.44 -10.54 <br /> g W-6 41.80 52.89 -11.09 <br /> aAbsolute elevations based on City bench mark 786 on the <br /> northwest corner of the Kettleman Lake and Hutchins Street <br /> intersection. -Elevation-of_bench--mark 786 is 43:11-feet - — -- <br /> -above sea level: <br />