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YN <br /> `. .r. <br /> ask - MO <br /> H. srxSY+der°+r. :M" i <br /> Quik Stop Market No, 132 August 28, 1990 <br /> Job No. 349132-31 Page 4 <br /> The geologist will prepue a log of the subsurface conditions i,ncountered during <br /> drilling and will classify the soils according to the Unified Soil Classification System <br /> and Munsell Soil Color Charts. All drilling logs will be reviewed by a certified <br /> engineering geologist. <br /> Groundwater Monitoring <br /> �, Well Construction <br /> r� <br /> y After the soil sampling is completed, Exceltech will install a groundwater monitoring <br /> wells in each designated exploratory boring. Exceltech will construct the monitoring <br /> F wells in accordance with all permit requirements of San Joaquin County. <br /> The wells will be constructed of 2-inch-diameter, Schedule 40, flush-threaded polyvinyl <br /> t chloride (PVC) blank and slotted casing; no glues or solvents will be used. After <br /> .; drilling the boring to the desired depth, the PVC casing will be installed through the <br /> hollow-stem auger. The screened interval of the casing will extend sufficiently above <br /> the water table so that the presence of free floating product can investigated. As the <br /> I auger is withdrawn, sand will be slowly poured down the borehole annulus to <br /> approximately 2 feet above the slotted screen section. Bentonite pellets will be placed <br /> f on top of the sand and hydrated to form an annular seal. The remaining portion of the <br /> !i annular space will be sealed with a neat cement and bentonite grout. The top of the well <br /> will be set in a waterproof traffic-rated vault box slightly above grade with a locking <br /> ' cover to provide security and protect the PVC wellhead. A concrete surface seal wii] <br /> be installed to complete.the well construction. <br /> Survey <br /> The wells will be surveyed by a licensed land surveyor. The wells will be located both <br /> 1'= horizontally and vertically(to the nearest .01 feet MSL). A site plan will be prepared.: <br /> r at a reasonable scale so that the data can be portrayed in auseful manner. <br /> 6: <br /> Well Development <br /> �. After construction,each well will be developed using a surge block to agitate and set the <br /> sand pack around the annulus of the well casing. A bailer will rz used to remove water <br /> manually after each surge. Well development (a) removes residual silts and clays left . <br /> from the drilling and (b) improves the hydraulic conductivity between the wells and the <br /> natural formation.__After_development, the well will be allowed to recharge with water - - - - <br /> a from the surrounding formation (approximately 24 hours), enabling Exceltech to <br /> r° collect a representative water sample and to measure the thickness of any floating <br /> product encountered. <br /> F All water collected during well development will be'placed in D'OT 17E drums and left <br /> ' on-site until laboratory analyses are complete. At that time, the drums and water may <br /> `^✓ be properly disposed of by Quik Stop. <br />