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Mr. Lynn Williams 16 April 2009 �teOS�/ilCeC, Page 3 consllitants o cut and cap product and vent line piping at the edge of the excavation ( i . e , adjacent to the existing canopy which will not be removed ) ; o backfill area with existing fill and balance of material required to bring excavation to grade ; and o supply, install and broom finish an area up to 35 ft by 40 ft by 6 - inches thick with a 3 , 000 psi fibermesh concrete . • Perform organic vapor analyzer screening of excavated soils during the performance of the UST closure activities . • Upon removal of the USTs perform soil sampling ( up to four excavation side-wall samples ) at the location of the 10 , 000 - gallon USTs . Collected soil samples will be laboratory analyzed for benzene , toluene, ethylbenzene, total xylenes , and methyl tert - butyl ether ( BTEX/ MTBE ) , polynuclear aromatic hydrocarbons ( PAHs ) , and total recoverable petroleum hydrocarbons (TRPH ) ( one location) . • Install a temporary well screen in the excavation and collect groundwater samples from the center of the excavation area for BTEX/ MTBE , PAHs , and TRPH . • Provide electrical connection to two , IRC -provided , 500-gallon ASTs that will be delivered and placed on pre- cast concrete slabs ( provided by manufacturer) . Geosyntec obtained estimates from three licensed petroleum storage systems contractors ( Attachment 2 ) , based upon the specific Schedule of Prices table supplied by Geosyntec for project bidding . Geosyntec received three subcontractor bids, with base bid costs of $ 26 , 125 , $ 29 , 970 and $ 36 , 800 . Based upon the estimates submitted , Geosyntec will subcontract the low bidder, Petroleum Resources & Development ( PR & D ) to perform the UST closure services and will perform oversight of the subcontractor during field activities , conduct required soil and groundwater sampling activities and perforin organic vapor analyzer ( OVA) screening of the excavated soil . Due to the uncertainties associated with the UST closure projects and unknowns associated with the 500- gallon ASTs , a 20 percent contingency has been added to Task element B . The contingency is in place to cover items such as increased excavation volumes , costs for vacuum truck on site time , increases in petroleum - contact water disposal volumes , increases in project duration due to weather, increased excavation volumes , additional concrete beyond the 1 , 400 X 8091 161CC R09040 . D0C t; llryllluer `S IS1 " 1t ' 13 � 1 `i � 5 I hillovittol5