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),at>v <br />ENC/NEE/?//VG <br />CIVIL d ENVIRONMENTAL ENGINEERS <br />August 25, 2008 <br />Ms. Kimbra Andrews <br />Management Analyst <br />Solid Waste Division <br />San Joaquin County Public Works Department <br />1810 East Hazelton Avenue <br />Stockton, CA 95201 <br />RE: WASTE CONTAINMENT CERTIFICATION <br />SAN JOAQUIN COUNTY HOUSEHOLD HAZARDOUS <br />WASTE FACILITY <br />EBA Job No. 01-841 <br />Dear Ms. Andrews: <br />OCT 0 7 2016 <br />ENVIRONMENTAL HEALTH <br />DEPARTMENT <br />EBA Engineering is pleased to provide evaluation and certification of storage bay containment for the <br />San Joaquin Household Hazardous (HHW) Facility located at R.A. Bridgeford Steet, Stockton, CA. The <br />evaluation included a review of as -built plans. interview with HHW Facility personnel, and calculations <br />of containment volume. <br />In accordance with California Code of Regulations (CCR), Title 22, Section 66264.175(b), containment <br />systems for the transfer, treatment, or storage of HHW shall be designed such that (1) the containment is <br />sufficiently impervious to contain leaks and spills: (2) the containment systems shall slope to enable <br />removal of liquids resulting from leaks, spill, or precipitation: and (3) the containment system shall have <br />sufficient volume to contain runoff from a 24-hour, 25 -year storm event plus 10% of the aggregate <br />volume of all containers or the volume of the largest container, whichever is greater. <br />As -built plans indicate containment sumps are constructed of epoxy -coated concrete and are, therefore, <br />considered impervious. The storage bays are each sloped to one corner to allow for liquids removal. The <br />storage bays are located in a covered structure and are not subject to runoff from precipitation. Therefore, <br />calculations of runoff from the 24-hour, 25 -year storm were not performed for this evaluation. <br />Results of the calculations are presented in the attached worksheet and indicate that the containment <br />sumps for all the storage bays meet ai d , e required containment volumes the facility. <br />Sincerely, <br />EBA ENGINEERING <br />Dale Solheim, P.E. <br />Principal Engineer <br />S. SO..y Fy <br />qQ � <br />140. 30888 <br />Efp 3�'3t/p <br />oyv crou- <br />Encl. Storage Bay Containment Calculation Worksheets <br />L WROIEMPI sUNIP CLRTIFlCATION 9.25 N DDC <br />825 Sonoma Avenue, Suite C Santa Row, California 95404 (707) 544-0784 FAX (707) 544-0866 <br />Also in Southern California <br />