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CLOSURE REQUEST S-31-94 person for Wickland is Mr. John Margowski . Mr Margowksi can be 40 reached at P.O Box 13648 , Sacramento, California 95853-4648, (916) 978-2485 SITE HISTORY The site was the Wheeler family residence since the turn of the century Regal Petroleum Corportation constructed a service station there in 1950 In July 1981, Wickland Properties took control of the site and leased at from the Wheeler family. On September 26, 1989 the UST' s and associated piping were removed and the site has undergone remediation since that time to the present Both residential and commercial property surround the site DISCOVERY OF UNAUTHORIZED RELEASE Wickland Properties, subcontracted Town & Country Contractors to perform the underground storage tank and product lane removal in accordance to the County Health guidelines . On September 26, 1989, Western Geo-Engineers (WEGE) monitored the site with a LEL/02 meter and a PID meter for health and safety purposes and obtained the required samples of the tank and product line excavations, see Table 4 . • Five 5 , 000 gallon single walled carbon steel underground storage tanks were removed by Town and Country Contractors on September 26 and 27, 1989, two regular gasoline, two unleaded gasoline and one super unleaded gasoline The bottom of the fzllup end of tank 4 appeared to have failed, (corrosion with possible pan hole) , sample T4A, see Table 4 and Figure 7A. Soil sampling of the tank excavation on September 29, 1989 , and the product lane trenches on October 5, 1989 , revealed that the soil was impacted with degraded gasoline, ranging to kerosene and fuel oil range hydrocarbons, see Work Plan revised November 13 , 1989 , and Table 4 A work plan was submitted and revised on November 13 , 1989, and the assessment of the site started. The April 22 , 1994 letter from Wickland Properties documents that tank tests and inventory records dad not indicate any leaks, see Appendix G Initial calculations of the volume of the release that remained an the soil after over excavation was 4025 pounds of gasoline range hydrocarbons, the estimate table, Table 2 , can be found on page 17 of UPDATE STATUS REPORT #6 , Dated July 26 , 1991 . This initial estimate was based on chemical results from the soil samples obtained from the UST excavation, product dispensing lane sampling and samples obtained from the soil sample borings SBI, SB2 , MW1 , MW2, MW3 , MW4 , MW5 and MW6 Update Status Report #15, dated February 9 , 1993 , provides another estimate of gasoline range hydrocarbons remaining an the soil after 2355 hours of operating the VES (98 days) , The estimate of page6