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2.4 Monitoring Well Construction Groundwater monitoring wells will be constructed in the soil boreholes described abo%c The wells will designed to monitor both free phase liquid and dissolved phase by drocarbons Thcy will be constructed with 4-inch diameter schedule 40 PVC casing, with threaded ends and factory screening The casings will extend the full length of the borings The wclls will be scaled with a bottom cap and screened to approxiinatcly 10 feet aboi c and below the highest anticipated groundwatcr lc"cl Filter packs, which consist of No 3 Monterey sand, will be placed bctwccn the well � casing and the annular space of the borehole The filter pack will extend 12-24 inches aboNc the top of the well screen, followcd by one foot of hydratcd bcntonitc b�� Ncat cement "ill be placed abo%c the hydratcd bentonite to the ground surface The screened casing slot size will be 0 020 inch The well seal will be a minimum of 5 feet long NAIcll heads will be scaled with a locking watertight co%cr The surface lc-,el cicN ation will be sure cycd to 001-inch with reference to a local datum by a licensed sun cyor The well number, installation date, construction details, will be marked on the inside of the lid of the well cap A diagram of a typical. well completion is ' prop idcd as Figure 2-1 California Fuels well construction and soil sampling summary op is pridcd in Table 2-1 ;4e 2.5 Well Surveying The location and cic%ation of the top of casing of the monitoring wells will be sure cycd to mean sea ]c,cl using the City of Stockton Datum by a licensed suricyor familiar with the site This information will be used with the water lc�cl data collected as described below, to determine the cic�ation of the water leici and groundwater flow direction beneath the site oh- 2.6 Well De,,elopment � The newly constructed monitoring wells "ill be dc,. eloped by or erpumping using a surge block until the discharge water is rclativcly free of settleable solids The turbidity of the discharge watcr will be measured during do-sclopment All well deN clopmcnt equipment coming into contact with groundwatcr will be decontaminated by washing in an Alconox solution followcd by tap and dcionized w atcr rinses Dc%clopmcnt water w ill be collected in 55-gallon drums at the site until groundwatcr chemistry results arc rcceiN cd for c%aluation of disposal requirements 2.7 Field Documentation % dedicated field notebook will be used to record significant field cr cnts All entries shall be made in the field and corrections will be made using a single line to cross out errors The field notebook will note the arra al of the drilling crew, drilling time, the depth to water, lithologic descriptions, F isual observation of contamination, and weather conditions 9