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File No. 20-3769-01 k%j KLEINFELDER March 16, 1994 As described earlier, monitoring wells will be installed in three of the four soil borings. The bonngs will be dnlled approximately 10 feet Into groundwater (approximately 60 feet bsg. The soil borings will be advanced using a truck-mounted drill rig equipped with 8-inch hollow stem augers The borings will be drilled, logged, and sampled following the protocol described in Attachment A, Sections A-2.1 through A-2.6 Following completion of the drilling, 2-Inch diameter PVC wells will be Installed in the borings. The wells will be constructed as described in Attachment A, Section A-3 1 All of the wells will be surveyed for well location and elevation above mean sea level (msl) so that subsequent water-level-sounding data can be utilized in determining groundwater flow directions and gradient. The wells will be surveyed as described in Attachment A, Section A-3.4. Task A4 - Monitoring Well Development and Sampling Forty-eight hours after Installation, the wells will be developed to remove sediment-laden water and to increase the hydraulic radius of the welts. Development will be performed as described in Attachment A, Sections A-3.2 through A-3.3. Water level measurements will be made in the wells at the beginning of each 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, Section A-4.1 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 contoured 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 wells are developed, three to five well volumes will be purged and samples will be collected as described in Attachment A, Section A-4.2. The three groundwater samples and a purgewater sample will be submitted to APPL 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 one week (five working days) for completion. Task A5 - Reporting Upon completion of the field activities and receipt of the analytical results, a report of findings will be prepared for client and agency review The report will include: • A description of the field activities, observations, and protocols copyright 1994 Kleinfelder, Inc Page 3 of 5