**Exhibit 10.3**ADDENDUM AGREEMENTTHIS ADDENDUM AGREEMENT (“Addendum Agreement”) is made this 17th day of April 2007, by and betweenUS ECOLOGY NEVADA, INC., a Delaware Corporation and successor in interest to US ECOLOGY, INC.,formerly known as NUCLEAR ENERGY ENGINEERING, INC. (“LESSEE”), and the STATE OF NEVADA, DIVISION OFSTATE LANDS, on behalf of the DEPARTMENT OF CONSERVATION AND NATURAL RESOURCES (“LESSOR”) andmodifies the Lease entered May 1, 1977.WITNESSETH:WHEREAS, LESSEE has been utilizing this site for the storage and disposal of hazardousmaterials and substances since January 5, 1962; andWHEREAS, LESSOR and LESSEE, on May 1, 1977, entered into a Lease (hereinafter the “Lease”) fora definite term of years followed by a ten year extension, whereby LESSOR leased to LESSEE certainreal property in Nye County, Nevada (hereinafter the “SITE”); andWHEREAS, LESSOR and LESSEE have entered into two previous Addendum Agreements, one datedDecember 7, 1979, and one on March 28, 1988 and the parties entered into a Settlement Agreement onSeptember 24, 1993, which amended the terms of the original lease; andWHEREAS, said Settlement Agreement on page 18, paragraph 8, recites in part, “...US Ecology inits sole discretion may exercise its option to extend the Lease...until such time as the BeattyFacility has reached its full capacity...”; andWHEREAS, LESSEE has exercised its right to extend the term of the Lease based on LESSEE’sexercise of its Option to extend the term of the lease, and the LESSOR has agreed to extend theterm of the lease; andWHEREAS, LESSEE has been issued a 5 year permit by the Nevada Division of Environmental Protectionon April 29, 2005, which will expire on April 29, 2010 subject to timely renewal; andWHEREAS, the SITE has a remaining useful life as a hazardous waste disposal facility forapproximately twenty (20) years; andWHEREAS, LESSOR and LESSEE agree that it is mutually beneficial to continue under the terms ofthe AGREEMENT; andWHEREAS, LESSOR has determined that the Rents and Fees do not need to be adjusted at thistime; andWHEREAS, LESSOR and LESSEE desire to continue the Lease on a year-to-year periodic tenancy, whichwill terminate when the facility reaches full capacity or when terminated by either party, asprovided below;NOW, THEREFORE, in consideration of the above recitals, the mutual covenants set forth below, andother good and valuable consideration, the receipt and sufficiency of which are herebyacknowledged, LESSOR and LESSEE agree as follows:AGREEMENT:1. Recitals. The above recitals are an integral part of the AGREEMENT and understanding ofthe parties and are hereby incorporated by reference.2. Specific Lease Amendments. Effective as of May 1, 2007, (the “Effective Date”), the termsof the Lease are amended as follows:a. The Term of the Lease shall continue as a year-to-year “periodic tenancy” beginning May 1,2007 continuing to May 1, 2008. The year-to-year term will continue thereafter until such timethat the facility is at capacity and can no longer accept materials for disposal, or it isterminated by LESSEE at its option, upon giving a NINETY (90) day written notice to terminate, orit is terminated by the LESSOR in accordance with section 14, Violations, of the Lease.
 
 

 
3. Effect of Addendum Agreement. Except as modified by this Addendum Agreement, the Lease,and all amendments to the Lease, shall remain in full force and effect. In the event of anyconflict between the terms of the Lease and this Addendum Agreement, this Addendum Agreement shallcontrol. This Addendum Agreement shall not be effective and binding unless and until it is fullyexecuted and delivered by both LESSEE and LESSOR.IN WITNESS WHEREOF, the parties hereby have executed this Addendum Agreement to Lease as ofthe day and year first written above.**LESSOR:**