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ARCADIS <br /> Monitoring Well MW-3 <br /> MW-3 is a 4-inch OD PVC groundwater monitoring well and was installed by Sierra on July 25 and 27, <br /> 1990. The monitoring well log provided by Sierra (Attachment 1)indicates that the total depth of the <br /> monitoring well when installed was 68 feet bgs with a screen interval of 48 to 68 feet bgs.As detailed on <br /> the monitoring well log the borehole was drilled to a total depth of 71.5 feet bgs, however,the total depth <br /> of the monitoring well was 68 feet bgs. A note is not provided on the boring log explaining the method <br /> used to backfill the interval from 68 feet bgs to 71.5 feet bgs; however, it was likely a bentonite grout <br /> mixture. <br /> Inspection Findings <br /> Monitoring well MW-3 is currently unsecured. Although the monitoring well cover was in place,the bolts <br /> appear to be the incorrect length resulting in the cover not being firmly secured to the well box. The well <br /> cover gasket is in average condition and should be replaced in the near future. <br /> r, <br /> ws L sn� RPA tt_ <br /> i <br /> t . <br /> ucg — <br /> y� t i <br /> The interior of the well box appears to be in good condition (i.e.the metal well box is not torn or rusted) <br /> and the grout is at an appropriate level. <br /> r <br /> k <br /> y k . <br /> S` <br /> t <br /> YISNf� <br /> Page: <br /> y:bm ammment�2wmmuMwtlontw,aMrce sp n n®cbnY.mmiladNx Ol s♦actlon oe7vtlnd= 3/5 <br />