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^� Stewart's Beacon Property <br /> Phase 11-Cround Water Assessment Proposal <br /> Page: S <br /> surface seas obtained by cementing in a water tight well box and a Iocking cap. <br /> Construction of this type of monitoring well is illustrated in Figure 3. <br /> Monitoring wells designed to test the second aquifer,will be constructed as follows: the <br /> upper aquifer will be isolated by an 84nch casing(schedule 80 PVC). Hollow stem <br /> auger drilling will be performed through this 8-inch casing. Continuous soil sampling <br /> will be done to evaluate the strata. The boring will terminate into the:second aquifers <br /> lower bounding clay layer. The well will be constructed of 2-inch PVC pipe(schedule <br /> 40),perforated with 0.04 inch slots up to about one foot above the top of the aquifer. <br /> Filter pack will be made of medium aquarium sand and a bentonite annular seat placed <br /> above the filter pack. The well will be secured with a locking well cap,water tight <br /> well cover and a concrete surface seal(about 3 feet deep). <br /> 4.7 Monitoring Well Development <br /> Each monitoring well will be developed before a water sample is collected. This will <br /> be accomplished by pumping until dear ground water is obtained and then removing an <br /> additional 5 well volumes. Where time-endurance sampling procedures are used, <br /> ground water will be pumped over a period of several hours with samples being <br /> collected periodically throughout the course of pumping. The extracted ground water <br /> will be stored in 55-gallon drun s until it's determined if the water is contaminated. <br /> t Contaminated water will be treated during the ground water remediation program. <br /> �. After permission is obtained from the County,uncontaminated water will be released <br /> into the city storm drain system. <br /> 4.8 Ground Water Sampling <br /> If its been over 24 hours since the monitoring well was developed,5 well volumes will <br /> be removed(one well volume=the amount of water contained within the well casing) <br /> before sampling the ground water. A travel blank will be provided by the laboratory <br /> and blanks will be collected before sampling to insure bailer or pump cleanliness. <br /> Water samples will be collected by using either a Teflon bailer or a bladder pump. <br /> 4.9 Cross Contamination Prevention <br /> All sample equipment(split spoon sampler,brass tubes,bailer,&pumps)and auger <br /> (drilling rod,drilling bits,&auger) ,will be thoroughly steam cleaned before being used <br /> and between uses. Plastic gloves will be worn while collected and changed between all <br /> samples:--------- - --- —-- —-----—-- --— — ---- - <br />