Supplementary Agreement for Renewal of Mobile Toilet Rental

The supplementary agreement for the renewal of the mobile toilet rental should include core clauses such as the renewal period, rent adjustment, and equipment maintenance responsibilities, and should be refined in conjunction with the original contract to ensure that the rights and obligations of both parties are clear and legally compliant.

I. Renewal Period

1. Clarify the Start and End Dates of the Renewal: The original contract period (e.g., "from XX/XX/XXXX to XX/XX/XXXX") should be specified in the agreement, along with the agreed renewal duration (e.g., "renewal for XX years/months"), starting from the renewal start date (e.g., "XX/XX/XXXX") and ending on the termination date (e.g., "XX/XX/XXXX").
2. Right of First Refusal for Renewal: It can be supplemented with "Party B must submit a written renewal application 30 days before the expiration of the renewal period; otherwise, it shall be deemed as waiving the right of first refusal for renewal" to avoid权益受损 (interest impairment, here it means loss of rights and interests) due to a lack of timely communication.

II. Rent and Payment Method Adjustment

1. Rent Amount and Payment Cycle: The rent standard during the renewal period (e.g., "RMB XX per year") should be specified, along with the payment method (e.g., quarterly or semi-annual payments), which can be executed in accordance with Article X of the original contract. If the original contract does not specify a late fee, it can be supplemented with "A late fee of X% per day will be charged for overdue rent payments" to约束 (constrain, here it means ensure) Party B's timely performance.
2. Basis for Rent Adjustment: If rent adjustments are necessary due to market changes or equipment upgrades, the reasons for the adjustment (e.g., "due to increased equipment maintenance costs") should be explained in the agreement, and the adjustment range should be reasonable.

III. Equipment Maintenance and Responsibility Allocation

1. Party A's Obligations: It should be specified that Party A continues to be responsible for the regular maintenance, upkeep, and repair of the mobile toilets, and ensures that the equipment complies with national safety and hygiene standards (e.g., "complies with the GB/T 18920-2002 'Urban Sewage Regeneration and Utilization - Water Quality for Urban Miscellaneous Water' standard").
2. Party B's Obligations: Party B must use the equipment reasonably and must not alter its structure or function without authorization; if damage is caused due to Party B's reasons (e.g., vandalism, improper operation), compensation should be made at the market price or repair should be carried out, and the compensation standard should be specified (e.g., "calculated as XX% of the original equipment value").

IV. Other Clauses

1. Validity of the Original Contract: It should be noted that "during the renewal period, other clauses of the original contract (such as liability for breach of contract and dispute resolution methods) remain valid, and in the event of any inconsistency with this supplementary agreement, this agreement shall prevail" to avoid clause conflicts.
2. Effectiveness and Number of Copies of the Agreement: It should be specified that "this supplementary agreement is made in duplicate, with each party holding one copy, and shall take effect from the date of signature and seal" to ensure the legal effectiveness of the agreement.

Recommendation: Refine the content based on the specific clauses of the original contract and the negotiation results between both parties, and have it reviewed by a legal advisor before signing to avoid potential risks.