ARCHIVED REPORTS XR0001451 - Laserfiche WebLink

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I ' November 22, 1995 Page 2 r) complexes identified on historical Unocal general arrangement plans, and (3) develop recommendations for additional investigative and remedial actions, as warranted ' SITE BACKGROUND Site Description and History The site is currently an asphalt-paved parking lot owned by the Wells Fargo Bank of North America (Wells Fargo) A site map depicting former and existing features is shown as ' Figure 2 The 0 26 acre site lies at an approximate elevation of 48 feet above mean sea Ievel The site is bordered by 1 lth Street to the north, Central Avenue to the west, a vacant Wells Fargo building to the south, and light commercial structures to the east The site was reportedly an operating Unocal service station from approximately 1921 through 1965 On September 30, 1965, the service station was closed, site ' equipment was moved to Tracy Marking Station, and the building was demolished Pertinent historical site information is presented below First Generation Underground Storage Tanks Based on general arrangement plans, two generations of USTs have existed at the site (Figure 2) The 1921�general arrangement plan showed that initial station construction included three 550 gallon USTs located beneath the sidewalk in the northwestern corner of the site (Figure 3) However, it is noted that the Unocal real estate files reviewed for Unocal's Phase I ' Environmental,Site Asse�ent Report(Environ, Inc , December 16, 1994) indicate that two 500-gallon and one 1,000-gallon USTs were installed in the northwest ' portion of the site during initial construction No other site information regarding UST capacities was available to PACIFIC These USTs are shown as"abandoned" on the 1950 general arrangement plan (Figure 4) Second Generation Underground Storage Tanks Three USTs of 2,600-gallon, 4,000-gallon, and 6,000-gallon capacities were installed in a common excavation ' west of the station building between 1938 and 1950 (Figure 4) An underground waste oil tank located south of the station building was also installed between 1938 and 1950 ' Aboveground Structures The 1950 general arrangement plan of the Unocal facility included a station building in the central portion of the site and a product ' island with two fuel dispensers north of the station building A 1956 "Site Map" shows that a product island may have been located west of the station building (Figure 5) This product island is not shown on either the 1921 or 1950 general arrangement plans _ 3100971A/REPORT2 F