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schedule 40 PVC well casing with threaded jci nts,. Machine slotted, <br /> 0. 020-inch well screen grill be place: from total depth to <br /> approximately 5 feet above first-encountered groundwater. Blank <br /> casing will then be placed on tcp of the slatted casing to <br /> approximately 0 . 5 feet bgs. a medium aquarium sand (13 ) will be <br /> placed from total depth to approximately 2 feet above the top of <br /> the well screen and a hydrated bentonite seal will be placed on top <br /> of the sand. Cement grout will be placed on top of the hydrated <br /> bentonite seal to approximately i . 5 feet bgs. A water-tight, <br /> traffic-rated well box will be placed in concrete from n 5 feer <br /> logs to grade to protect isle well casing. An expanding and 'locking <br /> well plug cap with a Chevron lock mill secnra the top of Ke we '` <br /> inside 'i"_he ;;ell box. <br /> Wells will be surveyet to mean-"sG-a-level at the co'iple tor? of fig d <br /> activities and site renovations. Water 'level measurements will be <br /> collected with a water level r,e ger to an accuracy of 0 . 01 *eet . <br /> If any free product is encountered, thickness will be measured. <br /> Gradient will be measured and established. <br /> The welis Will be developed by either_ hyctraullc cr pneumatic- <br /> method, <br /> neumaticmethod, purging a minimum cf ! 0 well volume's Of standing [tiTa'_`_er to <br /> produce relatively sediment flee fcrmat on groundwater for <br /> sampling. Formation groundwate:- will V-'e '�O__canterll from <br /> unused disposable PVC hailers using a hot'Gem empty!_ng device tO <br /> minimize degassing r_,f volatile ::^mpounds into the appropriate <br /> laboratory-supplied sample containers. The sample containers will <br /> be labeled, logged on a Chain-of--Custody and transported to a <br /> State-certified laboratory. Samples will be analyzed for TPH- <br /> gaso f ine, TPH-diesel and BTEX. <br /> 3 . 5 Report of Activities <br /> At the completion of all field activities , a comp-rehansive report <br /> will by prepared for the Regional Water Quality Control Beard and <br /> Sar. i3aquin County. The report iv; 1-1 � nclude the esizlts of <br /> verification coil sampling, as well as summary of field <br /> act.ivittes, exploratory boring logs, and chemical analytical <br /> reports. The report will be ureparid under the supervision of z <br /> California Registered Geologist . <br /> . 6 Schedule for Implementation_ <br /> on-site field activities are expected to commence on November 13 , <br /> 1995 , and continue after the acceptance of this work plan. `rank <br /> installation, excavation work, and soil disposal are expected tcj <br /> be complete in 3 nils month pe mica, weather permittin4. <br /> The site is scheduled to be pavot at t-hc end of December 1995 . i <br /> is hoped that all borings/well installations will be complete prior <br /> to that time . Well permits will be applied for upon acceptance <br /> of this work plan. Drilling will commence within 2 weeks of <br />