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Stockton Promenade—N Edison0treet USTs& Utility Corridors • Page 6 Underground Storage Tank Removal Report June 8,2009 WKA No. 7345.09 Sections of the underground piping exposed during assessment activities were observed as grouted and disconnected, indicating that they were inactive and abandoned in-place. ' 2.3 Rinsate Disposal Liquid and rinsate pumped from the USTs was disposed off-site by a licensed Hazardous Waste Transporter. The rinsate was transported by Asbury Environmental Services, Inc. to Demeno Kerdoon in Compton, CA. Approximately 300 gallons of liquid and rinsate was removed from ' Tank#1 and 150 gallons of liquid and rinsate was pumped from Tanks #3 and 4. Tank#2 was found filled with soil so no rinsate was generated from Tank#2. 2.4 Tank Condition Observations ' A WKA field geologist observed the condition of each UST as they were removed. Tank#1 was constructed with steel plating and rivets, which is consistent with typical pre-World War II tank ' design. Tank#2 consisted of corrugated steel with crimped ends, a galvanized coated interior, and was discovered filled with soil. Tanks#3 and#4 were of a welded design and were partially full of liquid product. All four tanks were observed to be buried at less than two feet bgs in the unpaved area of mounded soil along the Tuleberg Levee Road and were aligned in an east to west orientation (Figure 3 and Photo Log in Appendix Q. Tanks #1, #3, and#4 were observed to have numerous holes on the lower portion of each tank, while Tank#2 appeared to be less corroded and was free of visible holes. Each of the USTs ' exhibited varying degrees of surficial structural damage, perhaps as a result of being buried shallow under unpaved surface conditions. Because three of the four USTs were observed to be ' in leaking condition, an Underground Storage Tank Unauthorized Release Report was prepared (Appendix D). 2.5 Confirmation Sampling ' On December 5, 2008 and January 15, 2009, WKA conducted confirmation sampling by collecting soil approximately six inches to one foot beneath each of the USTs under the direction ' of Mr. von Flue of the SJEHD. Soil confirmation sampling locations are shown on Figures 3 and 4. The confirmation soil samples for Tanks #1 and#2 were collected in clean, glass jars secured by tight-fitting plastic caps. The confirmation soil samples for Tanks #3 and#4 were collected ' in clean, 2-inch diameter stainless steel tubes, capped with TeflonTM sheets secured by tight- fitting plastic caps.