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Frantier Trr11tsp0r7r1tia1t, Irrc, October 16, 199 bottom of the Bari nom. 823502.01 increm The trealie i Page A-3 ents as the burin: tills with g p` or augers are withdrawn from the baring are described ire a subsequent Saes for groundwater monitoring well installation in t paragraph (i f pertinent to this investigation). SQiI Cuttings generaEed Transp©nation during drilling are containerised in United States De (DOT)-approved drilms, or placed on and covered with stored on site in an area inaccessible to the pertinent of characterized b general public. Typically' h plastic sheeting, and y cc�llzcring and analyzing ypically' the stockpiled soil is can recammenci uncomposite samples from the Stockpile. analytical resz�lts. Disposal method for disposition of the cuttin Twining osal will be the responsibility of the client. Cuttings based A- on the Standard O eratin Procedures Twining i5 a C-57 licensed water F r Groundwater Mori orin The groundwater monitorin well drilling contractor t�e11 Irt tall on registered g wells are installed (Contractors License No, 506159), geologist or certified professional engineernder the direction of a California Soil borings for monitorinU wells are drilled and sampled according Operating proCedcires for Drillino sampling, and constructing and Soil Sampling,,. to Turining's "Standard wells, and well constru Pio g magalp see thoroughly for according to Twir�in,'s "5ttrndell p drilling, Aerating Procedures for Equipment Deco�aminl#on,d Groundwater monitoring wells are constructed of mi (PSC), stainless steel, or other nrmum Schedule 40 wrapped. Casing - materia] casing. Screen may be Polyvinyl chloride conditions, and Project budgets.Well Th w machine-slotted or pecificattons will depend u on ire' made flush-thre�3ded Connections. ell screen and casing Sections ProjectObj factory- material The well filter pact; materia!! consists of a � material is placed in the annulus between ppropriateIy-sized PTe-washed sand. to approximately 2 feet above the to the boring waif, from the bottom of the borin filter emplacement, preliminaryP of the screen. the to g about the casindevelopment maY he performed to provide a uniformfilter Casing. Above the filter pack, a 3- to 4-foot thick b Pack bentonite may consist of 1/4- Or 1 bentonite seal is installled, pack pellets are used, they are hydrated /riot to pellets, or may be in the for The gallon of water for every bucket of pellets. The thickness grouting m of a slurry. If regulatoryre P o knes of the bEll, by adding at least one requirements. ntonite seal depends upon local The remainder of the well annulus is sealed with a 6- sack to one continrtotJs operationromsack sand- For wells tivitlz �4 5c:itl n�c�rhrn1� feet �heeebatram of the inteNcement, pp cement grant - augers, whirl, will e�tcncl tc� ti��ithin le feet of the al to be filled to the rap. p, the grant is emplaced through the hollow regulatory agency the „ bentonite Seal. IF re �rcaut is emplaced h required b to within 15 feet cif the seal The tremie Y Pumping through y the Local Ip-foot increments as the boring fills with °h a trem1e PtPe which extends Pipe or augers are withdrawn from the boring in grout. A watertight well cap is placed on top of