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KLEINFELDER File No 20-3769-01 November 21, 1994 • Task B03 -Monitoring Well Development and Sampling Forty-eight hours after installation, the new monitoring well will be developed to remove sediment-laden water and to increase the hydraulic radius of the well Development will be performed as described in Attachment A ,Water level measurements will be made in the wells at the beginning of the sampling round, `prior-to purging and sampling the wells The depth to groundwater will be measured in each well according to the protocol described in Attachment A The depth to groundwater measurements will then be converted to relative groundwater elevations with respect to mean sea level or a local benchmark by subtracting them from the surveyed casing elevations r The resulting groundwater elevations will be used to assess the direction of the groundwater flow and gradient at the time of sampling This information can then be used to assess which wells represent upgradient and which wells represent downgradient groundwater conditions Approximately 24 - 48 hours after the new well is developed, three to five well volumes will be purged, and samples will be collected from the well, as described in Attachment A The one groundwater sample from the newly installed well will be submitted to APPL, Inc for the following analyses X1,1 • TPH Pur eable b EPA Method 8015M15030 (gasoline range) Q g Y • BTEX by EPA Method 8020/602 /� �CZo v�":::�f— 01 The samples will be submitted for analyses on a normal laboratory schedule requiring approximately two weeks (10 working days) for completion The costs for this task as reflected in Attachment B is the same unit costs for development and chemical analysis as our awarded contract However, our cost estimate reflects the additional chemical analyses required by Mr Michael Collins of the SJCEHD during the previous phase of the assessment Task B04 - Composite Sampling of Previously Excavated Soil During previous excavation activities performed at the site by DSS Engineering Contractors for West Clay Properties, the excavated soils were separated into two piles One of the piles contains approximately 250 cubic yards of overburden soil that is not anticipated to contain detectable levels of hydrocarbons The other pile contains approximately 550 cubic yards of soil 0 which is anticipated to contain detectable concentrations of petroleum hydrocarbons ETH and WC/94 Page 5 of!1 Copyright 1994 Kleinfelder, Inc