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K L E I N F E L D E R File No. 20-YP4071 June 23, 1994 Forty-eight hours after installation, the new wells will be developed to remove sediment-laden water and to increase the hydraulic radius of each 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 then 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. The resulting groundwater elevations will be used to assess the direction of the groundwater 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 hours after the new well is developed, three to five well volumes will be purged, and samples will be collected from the wells, as described in Attachment A. The three groundwater samples will be submitted to a State certified laboratory for the following analyses: • TPH Purgeable by EPA Method 8015M/5030 (gasoline range) • BTEX by EPA Method 8020/602 The samples will be submitted for analyses on a normal laboratory schedule requiring approximately two weeks (10 working days) for completion. ASSITNIPTIONS AND CLIENT REESPONSIBILIII�� • This proposal will be adequate to obtain authorization from the SJCEHD. If a more comprehensive workplan is necessary, additional charge for workplan preparation will be incurred. • Adequate work space and access will be provided. Kleinfelder will attempt to advance the soil boring at the proposed locations. If the drilling equipment cannot be positioned, alternative drilling locations or sampling methods should be investigated. The borings are to be drilled with a truck mounted drill rig equipped with hollow stem augers. If alternative drilling methods or concrete cutting are required, additional costs may be incurred. • No respiratory protection or shoring will be necessary. ETH:md 3E/94 Copyright 1994 Kleinfelder, Inc. Page 4 of 6