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4 _ <br /> I <br /> i <br /> Work Plan for Additional Assessment 3 <br /> Barbara Drake,26495 North Thornton Rd.,Thornton,CA Juty 26,1995 <br /> TASK 3: GROUNDWATER MONITORING WELL INSTALLATIONIDEVELOPM ENT <br /> Groundwater monitoring wells will be constructed of 2-inch-diameter blank polyvinylchloride (PVC) <br /> casing and 0.020-inch-slot PVC well screen. The well screen will be installed from approximately five <br /> feet BGS to the bottom of the boring at 20 feet BGS. A sand filter pack will be placed within the <br /> annulus of the well from the bottom of the boring to approximately 1 foot above the top of the well <br /> screen. The annulus will be sealed with approximately 2 feet of bentonite on top of the sand, and a <br /> ortland cement/bentonite rout to the surface. Well constructions specifications will be adjusted <br /> P 9 P 1 <br /> according to field conditions, if required. The well head will be protected by a locking cap and a <br /> traffic-rated,watertight street box set in concrete. <br /> Prior to groundwater monitoring and sampling,the monitoring well will be developed by surging and <br /> bailing to remove fines from the well and sand pack. The well will be developed until well water is <br /> visibly clear. Development water will be stored in DOT-approved 55-gallon drums on site. <br /> al position of,each well will be professionally surveyed relative to <br /> Tip•f casing (TQC) and h�riz�nt N � y y <br /> mean sea level using the established bench mark for the wells on site. ; <br /> TASK 5: REPORT PREPARATION <br /> I <br /> Groundwater Technology will prepare a report summarizing the data collected under the scope of work <br /> detailed above. The report will document the methods and results of the work and include all <br /> appropriate maps and laboratory analytical documentation.. <br /> PROJECT SCHEDULE <br /> I <br /> Groundwater Technology is prepared to begin work on this project within two weeks of work plan <br /> approval by the SJCPHS-EHD: Discussions have already been initiated with the County and British <br /> Petroleum regarding well installation. The report will be submitted approximately four weeks after the <br /> receipt of all laboratory analytical results. <br /> 0053ass.wkp <br /> ❑❑�GROUNDWATER <br /> ❑❑❑TECHNOLOGY® <br /> s <br />