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r <br /> w <br /> groundwater in 55-gallon drums labeled awaiting analysis. <br /> The wells will be considered to be stabilized when the following <br /> indicator parameters were within the ranges established below. <br /> Temperature (plus or minus 0. 5 degrees Centigrade) , pH (within plus <br /> or minus 0. 1 pH unit) and Specific Conductance (within plus or <br /> minus 50 of the reading range) . <br /> 4) When the wells are stabilized, three groundwater samples, one <br /> from each well, will be collected by a clean dedicated bailer, <br /> placed in several 40 ml VOAs with Teflon septa, labeled, held in a <br /> cooled (4 Degrees C) ice chest and transported to a State Certified <br /> Laboratory, under COC documentation, for analyses each quarter for <br /> one year . <br /> 5) The groundwater samples collected will be analyzed for Total <br /> Petroleum Hydrocarbons as Gasoline (TPHG) and Benzene, Toluene, <br /> Ethylbenzene and Xylene (BTEX) . The groundwater samples will be <br /> analyzed for TPHG by EPA Method modified with purge and trap <br /> preparation 5030 (GC/FID) with detection limits of 50ug/1. EPA <br /> Method 602 will be utilized for BTEX with a detection limit of <br /> 0. 5ug/1 as required by the SJCEHD. <br /> 14) Four reports, one for each quarter, signed by the Certified <br /> Engineering Geologist, will include a summary of the field work, <br /> COC documentation, certified analytical results, conclusions and <br /> recommendations, in accordance with the "Tri-Regional Board Staff <br /> Recommendations for Preliminary Evaluation and Investigation of <br /> Underground Storage Tank Sites" . The four quarterly reports will <br /> be submitted to the client and the SJCEHD. <br /> ESTIMATED COSTS and SCHEDULE <br /> The estimated costs for the proposed work sent under separate cover <br /> is based on the assumptions listed below. The costs include <br /> Professional fees, travel, per diem, equipment rental and chemical <br /> analyses. <br /> 1. The depth to groundwater and the gradient are generally as <br /> assumed. <br /> 2 . Purge water is not contaminated and can be disposed of on <br /> site. Disposal of any contaminated water is the responsibility <br /> of the property owner. <br /> 3 . Laboratory analyses are conducted on a normal (10 day) <br /> turnaround schedule. Shorter turnaround time is available. <br /> 4 . Water and electric power are available on site during the <br /> sampling. <br /> 3 <br />