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i } J 71� April 20, 1998 Page 2 Wright Project 98-4529 Monitoring Well Sampling and Development The monitoring well will be developed to remove the drilling muck, grade the sand pack and provide a more complete hydraulic connection to the aquifer. A well development log will be kept of the well volumes removed until the water becomes clear and the amount of sand pumped is minimal. The well will be allowed to recover for at least 72 hours prior to sampling. The elevation of the casing will be surveyed to a know datum- Groundwater SamWinng Each exploratory boring and the monitoring well will be sampled. The ground water samples collected from the boreholes will be used for a rapid reconnaissance of the site groundwater contamination_ A brief summary of these procedures follows: Each borehole will be advanced into the aquifer and temporarily cased. The water entering the borehole will be sampled using a clean bailer,and carefully poured into the appropriate laboratory prepared container with minimum cavitation. Each monitoring well will be purged using calculated well volumes based upon the depth to water in each casing. Depth to groundwater measurements will be made to the nearest one-one hundredth of one foot,and also checked for the presence of separate phase product. As each purge volume is removed,measurements of pH,electrical conductivity and temperature will be take until these parameters stabilize,which is interpreted to be aquifer water entering the casing. The Sample will be carefully collected with a clean bailer and poured into the appropriate laboratory prepared container with minimum cavitation. Each water sample will be labeled, logged onto a chain-of-custody form, and placed in a chilled ice chest. Upon completion of the borehole sampling, the borehole will be scaled. Upon completion of well sampling, the well be closed and locked. Chemical Analvsis Up to 12 soil and 6 groundwater samples will be analyzed at a State Certified analytical laboratory. Samples will be tested for the following: Total Petroleum Hydrocarbons as Gasoline (TPHG), Total Petroleum Hydrocarbons as Diesel(TPHD),Benzene(B), Toluene (T),Ethylbenzene(E)and Xylene(X), and Me tent-butyl-ether using EPA Methods 3510/8015,8020 and 8260. The analyses will be run on an"normal'turnaround(five wor ting Days . Rte— A Site Investigation Report and Recommendations for Soil and Groundwater Management Practices will be prepared. The report will include the field methods, permits, exploratory boring logs, monitoring well construction details, chemical analytical data and report narrative. The report will include estimates of contaminant extent, conclusions and recommendations for besty management practice during the fuel tank installation project. A copy of this workplan baz been srihmitted to PHS FHT)without permit applications or service request form. If you have any questions,please call. Sincerely, Debra Anderson Christopher M.Palmer Operations Manager HG246,CEG 1262 Attachments: Figure 1.Location Map Figure 2.Boring Location Map Wright Environmental Sampling and Well Installation Protocols cc: PHS EHD-Mr.Jefferey Wong