COMPLIANCE INFO - Laserfiche WebLink

Home Browse Search

A filter pack (sand) will be installed from the total depth of the boring to 2-ft above the top of the well screen. 2.5 feet of hydrated bentonite pellets will be installed above the filter pack. The well will then be grouted using concrete slurry to local grade level. Following the grouting of the well a metal Christie box, will be installed at the well head. A lockable water tight cap will be secured to the top of the 2" PVC well casing. The installation of the MW will be in accord with applicable regulatory requirements, i.e. permits, inspections, etc. The minimum of 72 hours will elapse between MW installation and MW development. An oil/water interface probe will be used to determine the depth to water and the depth to the bottom of the well casing. The monitoring well will be developed using a rod and surge block assembly. After initial pH, conductivity and temperature parameters are recorded, the surge block will be installed. The rod and block assembly will be forced through the water column and then raised. Typically a well will be surged 25 times then two volumes of water will be extracted from the well casing. The parameters will again be collected and the complete cycle repeated three additional times. Parameters will be collected and the well purged once again for two additional volumes of water. A minimum of 24 hours will elapse between MW development and sample collection. If possible, five (5) casing volumes of groundwater will be extracted (purged) from the MW prior to the collection of groundwater samples for analysis to maximize the possibility of collecting a water sample representative of the formation water. Should recharge of the well be slow, groundwater samples will be collected after sufficient groundwater accumulates in the well casing to provide the requisite volume for the requisite analysis. Groundwater samples will be collected using a Watera positive displacement pump attached to new, dedicated 'A" high density polyethylene tubing inserted into the well casing for purging and sample collection. The sample will be labeled and placed in a cooled ice chest for transportation to a state certified laboratory for analysis of TPH-d and TPH-mo. A completed chain of custody documenting sampling data, and analysis to be performed will accompany the samples from the field to the analytical laboratory. The soil cuttings and equipment decontamination liquids generated during the drilling of the boring will be properly contained pending disposal of these materials. 4.0 Sample Containers, Preservation, and Documentation Soil will be collected in 6-inch by 2-inch brass sample sleeves (hollow stem). After removal from the sample barrel the ends of the soil sample containers will be covered with Teflon® plastic sheeting and sealed with slip-on plastic end caps. Groundwater samples will be collected in unpreserved 1-liter amber glass bottles equipped with screw-on caps. Samples of soil and groundwater collected during the performance of the scope of work will be properly preserved and documented. After collection of the sample a label containing the following information will be attached to the sample container; 1) date and time of collection, 2) sample identification number, 3) project number, 4) identity of sample collector, and 5) analysis required. CE Project No. 99R-4041 Additional Monitoring Well Work Plan 4