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r KAPREALIAN ENGINEERING9 INC. K( E Consulting Engineers P. O. BOX 913 BENICIA. CA 94510 (707)746-6016 (707)746-6918 FAX:(707)746-5581 KEI-P89-1104.P1 November 22 , 1989 Unocal Corporation 2175 N. California Blvd. , Suite 650 Walnut Creek, CA 94569 Attention: Mr. Tim Ross Ii N O V 2 8 1989 RE: Work Plan/Proposal ENVIRONMENTAL HENJ 11 Unocal Service Station #5421 7303 Pacific Avenue PEREfT/SER�'i:;E:i Stockton,- California INTRODUCTION 1. Background: On November 17, 1989, Kaprealian Engineering, Inc. (KEI) collected soil samples following the removal of two fuel storage tanks and one waste oil tank at the referenced site. The soil samples under the fuel storage tanks were collected at depths ranging from 15.5 to 16. 5 feet. The soil sample under the waste oil tank was collected at a depth of 9.5 feet. All soil samples were analyzed by Sequoia Analytical Laboratory in Redwood City, California. The samples under the fuel storage tanks were analyzed for total petroleum hydrocarbons (TPH) as gasoline, benzene, toluene, xylenes and ethylbenzene (BTX&E) , tetraethyl lead (TEL) , and ethylene dibromide (EDB) . Analytical results showed TPH ranging from non-detectable to 98 ppm, benzene levels ranging from non-detectable to 1.6 ppm, TEL ranging from non-detectable to 0. 17 ppm, and EDB levels ranging from non- detectable to 15 ppb, except for sample B2 , which showed TPH levels of 6, 500 ppm, benzene levels of 70 ppm, EDB levels of 1, 000 ppb, and TEL at 1.4 ppm. The soil sample from under the waste oil tank was analyzed for total extractable petroleum hydrocarbons (TEPH) , BTX&E, 8010 and PCB using method 8080, and metals - cadmium, chromium, lead and zinc. Laboratory analyses showed non-detectable TEPH, metals ranging from non-detectable to 25 ppm, with non-detectable levels of all other analytes. Laboratory results are summarized in Tables 1 and 2 attached. Laboratory analyses and Chain of Custody documentation are also attached.