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Chevran <br /> Chevron Pipe Line Company <br /> 555 Market Street, San Francisco, 94120- 141 � � <br /> Mail Address:P.D.Bax 1141,San Francisco,CA 94i2D-7141 <br /> D.T. Powell APR 15 1'KQ7 <br /> Vice President <br /> ENVIROMENTAL HEALTH <br /> .April 10, 1987 FlERMIT/SERVICES <br /> Alden Park Area <br /> Phase II Site Assessment <br /> Tracy; California <br /> Department of Health Services <br /> 4250 Power Inn Road <br /> Sacramento, CA 95826 <br /> Attn: Mr. Charles A. McLaughlin <br /> Dear Sir: <br /> Dames & Moore is currently conducting a Phase Il Site Assessment for Chevron Pipe Line <br /> Company in Tracy, California in the vicinity of Aiden Park. The Alden Park area is <br /> located in the southwest region of Tracy, California (Plate 1) and was formerly the site of <br /> a locomotive fuel storage reservoir facility. The former reservoir facility consisted of a <br /> concrete-lined. circular tank. The site is now occupied by a city parkwithin a residential <br /> area. <br /> In the spring of 1986, concrete and subsurface oil were uncovered adjacent to the eastern <br /> perimeter of Alden Park. During the Phase I subsurface investigation by <br /> Kennedy/Jenks/Chilton in October 1986, concrete was found at a depth of 5-7 feet under <br /> much of the Alden Park site. <br /> Our work plan for Phase II has been reviewed by Mr. David L. Brent of the Central Valley <br /> Regional Water Quality Control Board. The San Joaquin Local Health District and the <br /> City of Tracy are also .aware of our activities. At this time, the following has been <br /> accomplished as shown on Plate 1: <br /> • Soil samples were collected using hand sampling equipment from depths of'2, 4 <br /> and 8 feet in the vadose zone on the property of approximately 110 homes in <br /> the vicinity of the park to assess the extent, of soil contamination by oil. <br /> Samples were submitted for oil and grease analysis; <br /> • The location of the buried circular concrete slab was determined using the <br /> hand sampling equipment toe•erform robe transects near the slab edge; <br /> P P b � <br /> • Backhoe trenches were excavated at two locations on the slab perimeter and <br /> at one location in the center to visually examine the concrete slab. <br />