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ENVIRONMENTAL • <br /> 00 Point <br /> Sacramento,California 95815 <br /> L Main:1714)662-2759 Fax:(714)662-2758 <br /> June 23, 2015 <br /> Mr. Johnny Yoakum <br /> San Joaquin County <br /> Environmental Health Department <br /> 1868 Hazelton Avenue <br /> Stockton, CA 95205-6232 <br /> Subject: Boring Permit Application — Supplemental ISCO Injection Project <br /> California Army National Guard Field Maintenance Shop #24 <br /> Stockton, California <br /> Dear Mr. Yoakum: <br /> Environmental Cost Management, Inc. (ECM) is submitting the enclosed boring permit application <br /> for the Supplemental ISCO Injection Project at the California Army National Guard Field <br /> Maintenance Shop #24 located in Stockton, California. ECM has included the following as part <br /> of the application package: <br /> • Completed San Joaquin County — Environmental Health Department (SJEHD) Boring <br /> Permit Application, <br /> • Completed Master File Record Information (MFR) form, <br /> • Brief work scope summary, <br /> • Boring plan figure, and <br /> • Check for$520 to cover the Boring Permit Fee($130) and three separate Inspection Fees <br /> ($390). <br /> We will be completing a total of 29 borings in three (3) mobilizations. The first mobilization is <br /> scheduled during the week of June 30, 2015 and will entail drilling through the concrete slab 10 <br /> to 12 feet bgs using hollow stem and then a star bit or air hammer will be used to break through <br /> the slab. Once the concrete has been passed the boring will be temporarily terminated and sealed <br /> using bentonite and sand until the ISCO injections. The second mobilization will commence the <br /> supplement ISCO injections during the week of July 6, 2015 with the last ISCO injection <br /> mobilization under this permit during the week of August 10, 2015. Please contact me if you have <br /> any questions or need additional information to process the application package. <br /> Sincerely, <br /> ENVIRONMENTAL COST MANAGEMENT, INC. <br /> '�eL212J_ <br /> Luis M. Mercado, P.G. <br /> Senior Geologist <br /> Office: (916) 419-7184 <br /> Mobile: (915) 955-2477 <br /> Enclosure: Boring Permit Application Package <br />