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Environmental Health and Safety Texaco Refining and Marketing erat,ng procedures Standard op for Groundwater Monitoring and Sampling Personnel obtaining field information are routine procedures to be followed of groundwater during the monitoring and The following roduct thickness and samples to assure that. concerning petroleum p procedures are designed sampling of Texaco srles These les are properly collected Information and same reserved and transported in a manner such that they are Samples are identified,p representative°sample g resuhs are reproducible. Monitoring and Water Level Measurements are needed to document groundwater clow directions and sang he late groundwater monitoring well and comp Water level measurements groundwater at the gradient. By gauging the level at wafer in a g wells. data, calculations can be made to at }beiween successive mQndor,ng compiled d roundwat gradient monitored well is i,owing and the g e the level of water in a An interface p robe, it Is slowly lowered into the well until the robe or electr ng eitherprobe,generally used io dace probe above the water monitoring well When Ise g alarm indicating water is heard Raise the ,hto vet'Viehat oscillating into qhe water at h 10 least three times measured formhe sametrue tspot level and (ower back to wal terof Casing" mark should be at the North water Is measured The depthThe designate"Top aye On on the top of the well casing the probe, read thegnumbers atkedhsteell add- side of the casing. ��flt water moving of the well cast' the level of water in a rmonitonr well When using the determine the distance to water cram the top portion of the tape tape may also be used to gauge tape, it Is slowly lowered Into the well pe tthe termine the distance from the steela to the surface grade, re-chalk and encounters water Read the numbersRaise the atop th to water is predetermined top of the well casing on the Well Gauging Form and Groundwater it back Into the water at least low fames to verify that the true e !owes depth to water measured. Record the Sampling Form petroleum product Thickness Measurements groundwater surface are observed floating on the g li free phase petroleum hydrocarbons (product) roduct w►1[ be measured tri each dur,n the water leve[ measurement, the thickness of the p b theProject role Coordinator. if g water samples will not be collected for chemical analysis from wellsth appropriate well. Ground specifically request led, only those wells `I containing product (even a sheen) unless spec Y product be same store, and oasts that weNs containing P Arrangements to bail, to Texaco the project Coordinator reel according made separately When product is stored, eration, Product product thickness of less than d Q� foot well be When, Product ct days of g leis The dispose of product m sed of clear plastic) baa policy, It will be double-contalne�d anti ( p obes. and/or acrylic { interface p each instrument are- Procedures will be measured using When p roCedures for obtaining level and thickness measurements ed with an interface probe. of the product will be measured robe, a visual evaluation The level of the top but not measurable with the interface p roduct surface product is suspected made using clear bailers. A bairine�wA[L-d'the bailer is the irdo a moo from the well can be of the bailer is NGT sub M so chat tt�e top r � (A ` +' i r' , ,t "` •' 4.n y_ T r�`.v.r-s-_'� ".'�' r. 7 Y �r