5.4 Hazardous Substances. **(a) Definitions.** "Hazardous Substance" means any product, substance, or waste the presence, use, manufacture, disposal, transportation, or release of which — by itself or in combination with other materials expected at the Premises — (i) could injure the public health, safety, or welfare, the environment, or the Premises; (ii) is regulated or monitored by a governmental authority; or (iii) could expose Landlord to liability to a governmental agency or a third party under a statute or a common-law theory. The term includes hydrocarbons, petroleum, gasoline, and crude oil, and their products, byproducts, and fractions.
"Reportable Use" means (i) installing or using any above- or below-ground storage tank; (ii) generating, possessing, storing, using, transporting, or disposing of a Hazardous Substance in a manner that requires a permit from a governmental authority, or a report, notice, registration, or business plan to be filed with one; or (iii) keeping at the Premises a Hazardous Substance that an Applicable Requirement requires to be disclosed to persons entering or occupying the Premises or neighboring property.
**(b) Tenant's obligations.**
*(i) Reportable Use requires consent; ordinary materials permitted.* Tenant shall carry on no Reportable Use at the Premises without Landlord's express prior written consent and Tenant's timely compliance, at its own cost, with every Applicable Requirement. Tenant may nonetheless use the ordinary, customary materials that the normal course of the Permitted Use reasonably calls for, along with ordinary office supplies — copier toner, correction fluid, glue, and the like — and everyday household cleaning products, so long as that use meets every Applicable Requirement, is not a Reportable Use, and puts neither the Premises nor neighboring property to any meaningful risk of contamination or damage, and Landlord to no liability. Landlord may condition its consent to a Reportable Use on whatever further protections Landlord reasonably thinks necessary to shield itself, the public, the Premises, and the environment from damage, contamination, injury, or liability — among them protective measures such as concrete encasements (to be installed and then removed on or before this Lease ends) and an increase in the Security Deposit.
*(ii) Duty to notify Landlord.* If Tenant learns, or has reasonable cause to believe, that a Hazardous Substance has come to be in, on, under, or about the Premises otherwise than as Landlord earlier consented, Tenant shall notify Landlord in writing at once and give Landlord a copy of any report, notice, claim, or other documentation Tenant holds about it.
*(iii) Remediation.* Tenant shall neither cause nor permit any Hazardous Substance to be spilled or released in, on, under, or about the Premises, the plumbing and sanitary sewer system included. Promptly and at its own cost, Tenant shall meet every Applicable Requirement and undertake every investigatory and remedial step reasonably advised — ordered or not — to clean up any contamination, and to maintain, secure, and monitor the Premises or neighboring property, where the contamination was caused or materially added to by Tenant or involves a Hazardous Substance brought onto the Premises during the Term by or for Tenant or any third party.
*(iv) Indemnity.* Tenant shall indemnify, defend, and hold harmless Landlord and its agents, employees, lenders, and any ground lessor from every loss of rent, damage, liability, judgment, claim, expense, penalty, and attorneys' and consultants' fee that arises out of or involves a Hazardous Substance brought onto the Premises by or for Tenant or any third party — though Tenant bears no liability for a Hazardous Substance that migrates underground onto the Premises from outside the Center where Tenant neither caused nor contributed to it. The indemnity reaches the effects of any contamination or of any injury to person, property, or the environment that Tenant creates or suffers, together with the cost of investigation, removal, remediation, restoration, and abatement; it outlasts the expiration or termination of this Lease; and no termination, cancellation, or release the Parties agree to releases Tenant from its Hazardous Substance obligations unless Landlord expressly so agrees in writing at the time.
**(c) Landlord's obligations.**
*(i) Indemnity.* Except where Section 7.5 provides otherwise, Landlord and its successors and assigns shall indemnify, defend, reimburse, and hold harmless Tenant and its employees and lenders from every environmental damage, remediation cost included, that results directly from Hazardous Substances present at the Premises before Tenant took possession or from the gross negligence or willful misconduct of Landlord or its agents or employees. Landlord's duty, as and when the Applicable Requirements demand, reaches the cost of investigation, removal, remediation, restoration, and abatement, and outlasts the expiration or termination of this Lease.
*(ii) Pre-possession and government-required investigations.* Landlord retains responsibility, and shall pay, for any investigation or remediation that a governmental body with jurisdiction requires as to Hazardous Substances present at the Premises before Tenant took possession — unless the measure is required because of Tenant's use of the Premises (including any Alterations, as Section 6.1 defines them), in which event Tenant shall pay. Tenant shall cooperate fully in any such work when Landlord asks, including by giving Landlord and its agents reasonable access to the Premises at reasonable times to discharge Landlord's investigative and remedial responsibilities.
**(d) Termination on a Hazardous Substance Condition.** Should a Hazardous Substance Condition (defined in Section 8.1(e)) arise during the Term, then — unless Tenant is legally responsible for it, in which case Tenant shall carry out the investigation and remediation the Applicable Requirements demand, and this Lease shall continue in full force, subject to Landlord's rights under subsection (b)(iv) above and under Article 12 — Landlord may elect either of the following:
- (i) to investigate and remediate the Hazardous Substance Condition, if that is required, as soon as reasonably possible and at its own cost, in which case this Lease continues in full force; or
- (ii) where the estimated remediation cost is more than the greater of 12 times the then-monthly Base Rent or $100,000, to notify Tenant in writing, within 30 days after Landlord learns of the Hazardous Substance Condition, that Landlord intends to terminate this Lease effective 60 days after that notice.
If Landlord gives a termination notice under clause (ii), Tenant may, within the next 10 days, notify Landlord in writing that it commits to pay the amount by which the remediation cost exceeds the greater of 12 times the then-monthly Base Rent or $100,000, and shall then supply those funds, or satisfactory assurance of them, within 30 days after committing. If Tenant does so, this Lease continues in full force and Landlord shall remediate as soon as reasonably possible once the funds are available. If Tenant fails to give the notice and supply the funds or assurance within the stated times, this Lease terminates on the date fixed in Landlord's termination notice.