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i will be stockpiled on visqueen sheeting on a remediation pad which will be located approximately 200 feet south of the main excavat on. Clean soil will be stockpiled at the surface and used as a barrier to keep people rom entering the excavation. This stockpiled soil will be used as backfill material for future filling of the excavation. I The central portion of the main excavation will be further excavated approximately 15 to 20 feet below the floor. It is anticipated that all of the soil removed from this portion of the excavation will be contaminated. This excav tion is planned to attain a maximum depth of 35 to 40 feet below ground surface and will have vertical walls. All excavation will be conducted under the direction of a California Certified Engineering Geologist who will also maintain con rol over the separation of contaminated and clean soil. After the maximum axtent of the excavation has been achieved soil samples will be collected from the s dewalls and floors. Contractor will be required to standby with equipment until analytical sample reports have been received by the laboratory and permission from PHSEHD to backfill the excavation has been obtained. This delay may be as short as 2 days. This task will require the contractor to bid the excavation cost at a basic volume of 1 ,500 cubic yards of material to be removed and then a per yard cost for any additional material to be removed. Task 3: Stockpiling of Contaminated Soil The hydrocarbon contaminated soil will be stockp led on the remediation pad which will be located approximately 200 feet from the excavation. The remediation pad area will be prepared by a previous contractor and will hav3 all brush and weeds removed. Clean visqueen will be provided by Hi Hopes to serve as a base. Contractor will spread out visqueen sheeting and place a 6 inch thick base of clean fill material on the visqueen using a front end loader. Additional remediation pads will be prepared if required. Hydrocarbon contaminated soil will be placed on 1he remediation pad using the front end loader or other equipment capable to spreadi ig the soil into lifts 6 inches thick. The soil will not be piled any higher than 18 inche3 in thickness. The hydrocarbon contaminated soil will be covered with visqueen sheets to prevent unauthorized aeration at the end of each day. A berm of approximately 18 inches in height will b placed around the remediation pad to prevent potential stormwater runoff. This task will require the contractor to bid the preparation of the remediation pad and 2 I