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Stockton Metropolitan Airport Page 2 of 3
<br /> Former Fuel Station April 16, 2015
<br /> 5000 South Airport Boulevard
<br /> Stockton, California 95206
<br /> for this investigation. The wells installed by the U,S. Army in the early 1950s are located
<br /> approximately 350 feet west of the site and 550 feet southwest of the site—both upgradient to the
<br /> former underground storage tank (UST) farm on the subject site. Please arrange access to these
<br /> wells, obtain representative groundwater samples from each, and analyze the samples for PHg,
<br /> total petroleum hydrocarbons quantified as diesel (TPHd) total petroleum hydrocarbons quantified
<br /> as jet fuel, benzene, toluene, ethylbenzene and xylenes (BTEX), the five fuel oxygenates (methyl
<br /> ter-butyl ether, di-isopropyl ether, ethyl tert-butyl ether, tent-amyl methyl ether, and tert-butanol,
<br /> and the lead scavengers 1,2-dichloroethane and ethylene dibromide by appropriate laboratory
<br /> methods,
<br /> Anticipating favorable results from the above sampling, the EHD also directs the following actions
<br /> to prepare the site for closure,
<br /> Prepare a one- or two-page public notification regarding the pending closure, the
<br /> notification should include a brief summary of the characterization, residual contaminant
<br /> mass, and the human health hazard and risk posed by the residual contaminants on the
<br /> site. The LTCP (Low-threat Underground Storage Tank Case Closure Policy) requires that
<br /> a 60-day public notification process be conducted to allow the local property owners and
<br /> occupants, and other interested parties opportunity to have their concerns regarding the
<br /> pending case closure addressed before the case is actually closed, As required by the
<br /> LTCP, please notify municipal and county water districts, water replenishment districts,
<br /> special act districts with groundwater management authority, agencies with authority to
<br /> issue building permits for land affected by the petroleum release, owners and occupants of
<br /> the property impacted by the petroleum release, and the owners and occupants of all
<br /> parcels adjacent to the impacted property of the pending case closure and of their
<br /> opportunity to submit comments or questions regarding the pending closure to this agency.
<br /> Those to be notified may include, but are not limited to: California Water Service Company
<br /> in Stockton, City of Stockton Water District, San Joaquin County Public Works Utilities
<br /> Maintenance, Stockton Municipal Utilities Department, Stockton Community Development
<br /> Department and Stockton Public Works Department, Comments should be directed to
<br /> Gabriel Gonzalez, San Joaquin County Environmental Health Department, 1868 East
<br /> Hazelton Avenue, Stockton, California 95205-6232. Prior to distribution of the notification,
<br /> please provide a copy of the draft notice to the E for review and comment along with
<br /> the list of agencies and owners/occupants who will receive the public participation notice.
<br /> Please submit the one-page case summary/public notice and list of recipients to the EHD
<br /> by 01 June 2015, A template for the notification will be provided to your consultant, and
<br /> Submit a scope of work proposal that details the conditions and construction of the wells
<br /> and the methods and materials to be used to destroy them. The proposal must address
<br /> the concerns of the EHID and the San Joaquin County Well Standards requirements, such
<br /> as:
<br /> If the well construction is unknown and/or is located in an area of known or suspected
<br /> pollution or contamination, the well shall be destroyed by removing all material within the
<br /> original borehole (including the well casing, screen, filter pack, annular seal, and
<br /> conductor casing); the cleared borehole is then to be sealed with neat cement (grout}
<br /> from the bottom upward, through a tremie pipe or equivalent which extends to within 5
<br /> feet of total depth, to the depth of three to five feet below surface grade-,
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