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ATTACHMENT A - ULTRAMAR FIELD PROCEDURES of ground water The following section describes procedures used by Field Personnel in the performance sampling at Ultramar Inc sites Depth Determination depth to water from an Ground Water Level and Tota[ Dep well and a measurement of used to sound the bottom of down the The indicator probe Both the water level and total depth Dint on the casing is taken A water level Indicator is towere established reference p 01-foot the well and a measurement of theee est depth o the well is taken measurements are taken to the n is ,f Ground Nater le 15 collected from each t Visual Artalys wells, a water sarsiP disposable, polyethylene lin round water monitoring wells, lowering a clean, -The batter Is then prior to purging and sasnp 9 9 a5t the. water table interface ar the appearance The visual analysis Involves g product interface for subjective ana[ys+s one.half the be le batt th pts examined for floating pa water/product balker to a¢Proxtrnately within the The thickness of [e cAntatned product is noted in the balSer, retrieved, and the same product Is to the nearest d 01-foot e of a petroleum product sheen If measurable free l7 product from the depth to water by subtracting the depth to robe it used to determine the thickness of the free p product is determined free Wel[ purging and Samlp[ing volumes of water from the Well using to Monitoring vin approximately four casinpurge vaiurnes are calculated prior wells are Purged by removing el pump of the Purge water are monitorthe ed Monitoring and electric conductrvityvalumes have been removed,nd he in the temperature, Ply, She four casln9 vets are a clean disposable bailer or electrics! submersible pH nd Purge i'/° of the initial readin9s[e purging During purging, ur Ing,ground water and conductivity values have stabilized solids i After P g le Is then collected from The well is cansH ered to be sufficiently purged A water sample rear to temperature, p removed is relatively free of cusp or Pump ed dry P ground water,being leve batter If the well is bailerectia a If the well has 0 stabilize to within St3°/c of the initial water levet reading well will continue to allowed t of er round water is allowed each well wit a clean, di5Pg5ab[e P y the 9 ed to at least the rninimusn volume of wase th to water reading within two hours, the removing If the well has not recharged to of water has been removed aitan rechargedwithin 80°to Of the [ dep Inimum ttln two hours, the well Is considered �tel[ois sta sed f n 55aglon be purged ur the m depth to water reading within 8( p of the Initial de¢ le is collected Groundwater remove water and a ground water sample ending disposal raduct An estimate balled to remove the free p atnt drums at the site and labeled p 1e ce be collected If the free product thtcl r s 15 reduced Co the P wells where free product Is detected,the Wells will be round water sam¢ 1n product and water well be recorded. of the volume of P htckness is no longer Present in the �nlal free Product thickness measurement will erle is throughout the purging Process, a where a measurable t f is minimized If free product P round water sample will rrot be [affected h the sarnR e e through ward convex be taken and a 9 fitted slowly until an upward laced In 40 Is vials sa that air passa In cap? Is then p Ground water samples are stored The vial Is tilted and The Teflan'�" side of the septum The sample is then Invertedlrmoved edbottle m0re (to prevent va[attltertthe of ath Qf theevia] In the vial, the cap meniscus forms over them is screwed an tightly resent The sample and the cap I f an air bubble Is P against the meniscus, h the time of delivery to li htiy to check for air bubble The vial Is then resealed and rechecked for aibGround water tapped g le integrity sample Is transferred from Che ba completed to ensure campEnvironmental sled and stored an ice from the time of collection with�s the U S 15 then appropriately lab form Is and analyzed the laboratory. The ited t Chain-Of-Custody state-r specified analytes samples are transP Dried to astate-certified laboratory protection AgenCY'spe'cified hold times forte