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Ms.Margaret Lagorio, SJCEHD January 5,2005 <br /> Work Plan for Additional Site Assessment and Project No. 2033-15600-01 <br /> Evaluation of Remedial Alternatives <br /> Joe's Truck Plaza,Lathrop,California <br /> Page 6 <br /> Soil in the remaining brass tubes will be screened for volatile organic compounds using <br /> field instrumentation equipped with a photoionization detector (PTD). Stratus will record <br /> PID readings, soil types, and other pertinent geologic data on the borehole log. At a <br /> minimum, the sample from just above first-encountered groundwater and the sample <br /> from the bottom of the boring will be submitted for chemical analysis. Additional <br /> samples may be submitted for chemical analysis or physical testing at the discretion of <br /> the Registered Geologist or Engineer overseeing the project. <br /> Monitoriniz Well Construction <br /> Monitoring wells MW-9 through MW-11 will be completed to a depth of approximately <br /> 15 feet bgs. The well screen will consist of 10 feet of 2-inch diameter, 0.02-inch factory <br /> slotted PVC, installed from approximately 5 to 15 feet bgs. A filter pack of LonestarTM <br /> #3 sand will be placed in the annular space around the well screen, from the bottom of the <br /> boring to approximately 1 foot above the top of the screen. One foot of bentonite will be <br /> placed on top of the filter pack and hydrated with clean water, to provide a transitional <br /> seal for the well. The remaining annular space will be backfilled with neat cement. A <br /> traffic rated vault box will be placed over the wells and a watertight locking cap will be <br /> placed on the top of the casing. The Registered Geologist or Engineer overseeing the <br /> project may modify the actual well construction based on conditions encountered at the <br /> time of the investigation. <br /> Monitoring well MW-8 will be completed to a depth of approximately 40 feet bgs. The <br /> well screen will consist of 15 feet of 2-inch diameter, 0.02-inch factory slotted PVC, <br /> installed from approximately 25 to 40 feet bgs. A filter pack of LonestarTM #3 sand will <br /> be placed in the annular space around the well screen, from the bottom of the boring to a <br /> maximum of 2 feet above the top of the screen. Two feet of bentonite will be placed on <br /> top of the filter pack to provide a transitional seal for the well. The remaining annular <br /> space will be backfilled with neat cement up to surface grade. A traffic rated vault box <br /> will be placed over the wells and a watertight locking cap will be placed on the top of the <br /> well casings. The Registered Geologist or Engineer overseeing the project may modify <br /> the actual well construction based on conditions encountered at the time of the <br /> investigation. <br /> Survevin� <br /> The elevations of each newly installed groundwater monitoring well will be surveyed to <br /> the nearest 0.01 vertical feet relative to mean sea level (MSL) based on San Joaquin <br /> County benchmark UV-34. The horizontal locations of the wells and borings will be <br /> measured using the Global Positioning System (GPS). Surveying activities will be <br /> performed under the direction of a California-licensed surveyor. Surveying data will be <br /> K:Voe's Tmck Plaza\Work PlansUoes workplan 010505.doc <br />