Agmt12 TRA Environmental Sciences, Inc. MIG/TRA Environmental Services Inc.

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of the tank on the site and at this point, is the suggested size of the reduced project to analyze. 4. Partially Covered Tank Alternative: To reduce the appearance of the tank's mass on the site, soil would be placed around the base of the tank to make it appear shorter. The soil mound would be vegetated. The discussion of this alternative would include information on the amount of soil required to achieve a noticeable reduction in the mass of the tank, spatial consConsultantints of the site for the soil mound, the effectiveness of the soil mound to hide the mass of the water tank, and maintenance requirements of the mound. 5. Partially Underground Tank Alternative (sunk underground in a hole): A partially underground tank would be considered as a means of reducing the overall mass of the tank above ground. The EIR would consider this alternative in concept and for purposes of discussion would analyze burying the tank 10 feet deep and reducing its height to 14 feet above ground (from 28 feet analyzed in the IS/MND). The discussion of each alternative would include design and operation considerations, construction requirements (length of construction, cut/fill, soil export/import), geotechnical and slope stability constraints and considerations, area of disturbance of the slope above the tank, loss of vegetation, excavation in bedrock, changes in pumping requirements from that of the proposed project, construction truck haul, air quality and GHG emissions from project construction and operation, how that alternative meets project objectives and how it reduces the visual impact of the project. The discussion will present the projecYs service and engineering performance goals and describe how each alternative compares to the proposed project. The analysis will identify the environmentally preferred alternative taking into consideration short- term construction and long-term operational impacts associated with implementing the alternative. The EIR will have an appendix that will contain information on the general costs of construction, maintenance and operational requirements of each of the project alternatives that will be provided by the project design team. CONSULTANT will utilize its sub-consultants in preparing information on each of the project alternatives. The tasks of each of the sub-consultants are listed below: IEC: IEC will provide engineering and design support for the alternatives analysis. Their tasks will include, but may not be limited to: 1. Conceptual drawings for all the alternatives. IEC will compile the previously completed conceptual drawings for the project alternatives and configure them for inclusion in the EIR. 2. Prepare Supplemental Conceptual Drawings. IEC will develop cross sections for the proposed project as well as for all the project alternatives. 3. Earthwork Calculations and Narrative/Discussion of: ATTY/AGR/2014/AMENDMENTS/AMEND N0.1 TRA ENVIRONTENTAL SCIENCES INC.—CALIFORNIA TANK REV:06-05-14 VR Page 6 of 17