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Wells Fargo Bank, Stockton Branch <br /> September 6, 1996 <br /> Page 8 <br /> (depending on grain size distribution in the saturated interval) will be used as a filter <br /> medium around the screened interval, and completed to an equivalent depth of one inch <br /> above the well screen. <br /> The remaining annulus will be backfilled with a cement/bentonite grout slurry with 3% <br /> bentonite added from the seal to the surface vault. A locking well head will be installed, <br /> and a watertight surface vault will be placed at-grade for well security. <br /> Well Development and Sampling <br /> The monitoring wells will be allowed to stabilize for at least 48 hours prior to development. <br /> The wells will be developed utilizing surging and bailing techniques until the produced <br /> water is relatively free of sediment and the water parameters pH, temperature and <br /> conductivity have stabilized. The water parameters will be measured prior to development, <br /> and then every 1/4 to 1/2 casing volume during development. For purposes of this <br /> proposal, we have assumed that approximately three casing volumes will be removed. <br /> Development tools will be steam cleaned prior to use in each monitoring well. <br /> Groundwater from the monitoring wells will be sampled following development using pre- <br /> cleaned, dedicated bailers. Groundwater samples will be placed in pre-cleaned 40 ml glass <br /> VOA vials fitted with Teflon septa. Each vial will be labeled and kept cool in an ice chest <br /> —' until delivery to a state certified laboratory. <br /> Groundwater and decontamination rinsate produced during well development will be placed <br /> in labeled 55-gallon drums and stored on-site. The water will subsequently be disposed of <br /> by methods required by the State of California and the candidate disposal facilities. <br /> Consultant will advise the property owner in making arrangements for sampling, chemical <br /> analyses and disposal of the water. <br /> Consultant shall retain the services of a certified land-surveyor to measure the surface <br /> elevations of the wells and the depth to groundwater. <br /> Laboratory Analysis <br /> Approximately 60 soil samples and three groundwater samples will be delivered in ice- <br /> containers, with chain-of-custody documentation, to BC Analytical, Inc., a State of <br /> California approved laboratory. Approximately 50 samples will be placed on hold, and ten <br /> soil samples, as marked by the field geologist, will be submitted for analyses. Soil <br /> samples will be analyzed for TPH (simulated distillation) and for BTEX using EPA Method <br /> 8015M/8010. Groundwater samples and duplicate will be analyzed for VOCs using EPA <br /> Method 8240 and for TPH (sim. dist.) using EPA Method 8015M. <br /> Trip-blank samples and the collection of duplicate groundwater samples will provide <br /> quality control (QC) of the field and laboratory procedures. Trip-blanks will only be <br /> analyzed if the analytical results are suspect. One"blind"duplicate sample will be collected <br /> and submitted for analyses. <br /> aI <br />