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AMERICAN ENVIRONMENTAL MANAGEMENT CORf�. 10 September 1990 Please Refer to: AEMC Job No. 82500 1 s A t. t x 7f Mr. Harlin Knoll.. r Environmental Health SEP 1 1 1p",q San Joaquin Local Health Department P.O. Box 2009 ENVIR0�-,M ;,,; A Stockton, California 95201 FEE y ; RE: ABANDONMENT OF UNDERGROUND STORAGE TANK 124 WEST ELM STREET, LODI, CALIFORNIA Dear Mr. Knoll: American Environmental Management Corporation (AEMC) has been retained by Pacific Bell (Pac Bell) to review and help interpret the results of past studies pertaining to the underground storage tanks (USTs) located at the Pac Bell facility at 124 West Elm Street, Lodi, California (site). This letter report presents a chronology of the site history and includes results and recommendations regarding the final disposition of the USTs in question. SITE HISTORY In 1950 Pac Bell installed a 550 gallon single -walled steel UST at the site for the purpose of holding diesel fuel to power a backup electric generator. This UST reportedly was never used to hold any fluid other than diesel fuel. It was placed underground beneath a 20 -foot deep reinforced concrete vault with 2.7 -foot thick walls and two 6 -inch thick roof sections. The UST is accessible from the surface via a manway. Due to an increased need for diesel fuel storage capacity, a new 2000 -gallon single -walled steel UST was installed in 1974 just to the northwest of the 550-*allon UST at a depth of approximately 10 feet below ground surface (bgs). From that point in time the 550 -gallon UST was never again used to fuel the generator. On 29 June 1988 the Fire Marshal of the City of Lodi Fire Department issued a letter to L.B.M.E. Corporation, a consulting firm representing Pac Bell, stating that the dormant 550 -gallon UST "will be allowed to be filled in place in lieu of removal." The Environmental Health Division of the San Joaquin Local Health District (SJLHD) was contacted on 22 July 1988 and Pac Bell submitted an application for permission to fill and abandon the 550 gallon UST at the site in place. Conditions for abandonment in place required the drilling of three holes near the tank with two samples taken in each boring. Although the SJLHD did not respond to this application, Pac Bell contracted with Elder Engineering (L.B.M.E. Corporation) to conduct the required exploratory soil boring program. On 21 November 1988, L.B.M.E. Corporation issued a soil characterization report to the SJLHD entitled "Report of Contamination Investigation for Permanent Tank Closure (fill in place) One 550 -gallon diesel tank". A copy of this report is presented in Appendix A. Although this report concluded that no diesel fuel had escaped into the soil from the UST, 9719 Lincoln Village Drive, Suite 501, Sacramento, CA 95827 I (916) 364 8872