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April 22, 1987 AGS 8691-6 <br /> Beacon Service Station #1-502 - Lodi, California <br /> MONITORING WELL CONSTRUCTION <br /> Monitoring well MW-5 was installed in boring B-5. The well was <br /> constructed using thread-jointed four inch inner diameter <br /> schedule 40 PVC blank and slotted casing. No chemical cements, <br /> glues, or solvents were used in well construction. <br /> The screened portion of the well consists of factory-cut 0. 020 <br /> inch slotted screen. The well screen extends downward from <br /> approximately 31 feet below the ground surface to total depth in <br /> the well, approximately 61 feet below the ground surface. Blank <br /> casing extends from the top of the screened interval to the <br /> ground surface. <br /> The annular space was packed with graded sand to a point <br /> approximately twenty-seven feet below the ground surface, or four <br /> feet above the slotted interval. A twelve-inch thick bentonite <br /> plug was placed above the sand as a seal against cement entering <br /> the sand pack. The remaining annulus was backfilled with neat <br /> cement to grade. Installation of the sanitary seal was witnessed <br /> by personnel of the San Joaquin Local Health District. A graphic <br /> representation of well construction is shown on the right margin <br /> of the Boring Log. <br /> 5 <br /> .4,00/ied GeoSystems <br />