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Ms. Margaret Lagorio <br /> Page 2 of 2 <br /> Well Drilling and Sampling <br /> One replacement monitoring well will be installed at the approximate location shown on Figure 2. <br /> A C-57 licensed drilling contractor will use a drilling rig equipped with 8-inch diameter hollow stem augers to <br /> install one groundwater monitoring well. The well will be completed to a depth of approximately 27 feet below <br /> ground surface(bgs)with 2-inch diameter, Schedule 40 PVC casing and 0.010" slotted screen. The screen will <br /> be set from approximately 7 feet to 27 feet bgs to accommodate water level fluctuations. Filter pack will consist <br /> of#2/12 sand from the bottom of the well to approximately 1'/z feet above the top of the screen. The remaining <br /> annulus will be completed with 2 feet of hydrated bentonite overlain by neat cement grout to the ground surface. <br /> Surface completion will consist of a watertight,traffic rated well box and locking well cap. <br /> Drilling and well installation will be conducted under the supervision of an experienced geologist. Soil samples <br /> will be collected with a split spoon sampler at five-foot intervals for soil identification. Soil samples will be <br /> classified in accordance with ASTM Designation D2488-90, which is equivalent to the Unified Soil <br /> Classification System. <br /> Well Surveying,Development,and Sampling <br /> The elevations of the well casing collars will be surveyed to an accuracy of 0.01 feet. A minimum of 48 hours <br /> after completion, an experienced field technician will measure static depth to water, and then develop the well by <br /> pumping and surging until turbidity is minimized. A minimum of three casing volumes will be purged from the <br /> well. <br /> Groundwater samples will be collected into the appropriate containers when pH, temperature, and electrical <br /> conductivity have stabilized and water has recovered to at least 80% of the static levels prior to <br /> development. The samples will immediately be placed in an ice chest refrigerated to a temperature of <br /> approximately 4°C for shipment to a State-certified laboratory under chain of custody protocol. <br /> Laboratory analysis will consist of total dissolved solids (TDS) and chlorides using the appropriate EPA <br /> Methods. <br /> Please feel free to call me at(209) M-0888 if you have any questions or comments regarding this submittal. <br /> D C <br /> Respectfully, <br /> Ground Zero Analysis,Inc. � <br /> ct jONN P. <br /> John P.Lane c1�, No. 6/95 <br /> CA Registered Geologist No. 6795 <br /> Attachments r <br /> cc: RWQCB,Sacramento <br /> Southwest Hide Company <br /> G:\GROUNDZE\SWHIDE\REPORTS\Well Replacement WP.doc <br />