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' Mr.M.Scott Mansholt—CEMC <br /> Alley Reconstruction Improvement Project September 5,2007 <br /> Alden Park Page 2 of 2 <br /> ' ionization detector by SAIC personnel. Petroleum-affected soils were generally encountered at <br /> 1 foot below ground surface(bgs),typically had a tar-like appearance, and were stained a dark- <br /> grey to black color. The lenses of petroleum-affected soil were generally 1 foot thick. <br /> In order to mitigate odor that could potentially emanate from petroleum-affected soil encountered <br /> during reconstruction, SAIC contracted Kuma Corporation for odor control,which was <br /> ' subsequently deemed unnecessary. <br /> Approximately 173 tons(119 cubic yards)of petroleum-affected soil were removed from <br /> 12 locations in Alleys A through D(Figure 2). The largest volume of petroleum-affected soil <br /> ' (63.65 cubic yards)was removed during trenching activities associated with the installation of an <br /> underground storm water pipe near the Historical Old Valley Pipeline at Locations 1 through 5. <br /> The soil removal dates, approximate volume of soil removed and disposed, and depth of <br /> ' petroleum-affected soil encountered at each location is summarized on Figure 2. Petroleum- <br /> affected soil was segregated and stockpiled in soil storage bins located at the 990 Beechnut <br /> Avenue property. A total of 14 soil storage bins were transported to Altamont Landfill by Dillard <br /> ' Environmental Services. Waste manifests are included as Attachment B. <br /> During reconstruction a purported irrigation pipe was damaged by Teichert in the northern <br /> portion of Alley D. As a result,water temporarily accumulated at the ground surface, covering <br /> ' the area shown on Figure 2 with up to 18 inches of water. Under the direction and supervision of <br /> the City of Tracy,Teichert diverted the accumulated water into a local sanitary sewer line and <br /> resumed reconstruction activities the follow day. <br /> ' Photographs of the alley reconstruction project are included as Attachment C. <br /> If you have any questions regarding this work, please contact Larry Silva at (916) 979-3795 or <br /> ' Tom Burns at(916)979-3748. <br /> Sincerely, <br /> SCIENCE APPLICATIONS INTERNATIONAL CORPORATION <br /> ' �SONAL 6 <br /> F <br /> THOMAS v, <br /> Larry Silva Tom Burns,P.G. BURNS —+ <br /> Project Environmental Scientist Senior Project Manager • "XP. '4/0e <br /> No. 8053 <br /> • <br /> Enclosures: 4' <br /> Figure 1: Vicinity Map 9l�nF CAO�flQ�� <br /> ' Figure 2: Site Map with Locations where Petroleum-Affected Soil was Removed <br /> Attachment A: Site Access Agreement <br /> t Attachment B: Waste Manifest Tickets <br /> Attachment C: Alley Reconstruction Improvement Project Photographs <br />