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remains in the cooler dunng transport and is analyzed by the laboratory APEX ENVIROTECH. INC. along with the groundwater samples In addition a field blank may be STANDARD OPERATING PROCEDURES prepared In the field when sampling equipment is not dedicated Yrho field blank is prepared after a pump or bader has been edher steam cleaned or Quarterly Monitoring Reports properly washed pnorto use in the next well and is analyzed a" with the other samples The field blank analysts demonstrates the O P-4 effectiveness of the In-tiekl cleaning procedures to prevent aoss- contamination QAMPLE IDENTIFICATION AND CHAIN-OF- To minimize the potantlal for cross-contammation between wells all wall CUSTODY PROCEDURES development and water sampling equipment not dedicated to a well is either steam cleaned or properly washed between use As a secondary Sample identiti atlon and chain-ol-custody procedures ensure sample precautionary measure wells are sampled In order of least to highest integrity as well as document sample possession from the time of concentrations as estafsltshed by available previous analytical data_ collection to ultimate disposal Each sample container submitted for In the event the water sam lea cannot be submitted to the analytical analysis is Labeled a umberdentify the fob number date time of sample laboratoryon the same dap the are collected a due to weekends or collection a sample number unique to the sample any m-field twlida the les are fe y stored until the first Opportunity for measurements made sampling methodology name(s)of on-site ys) �nnP my oppo fY personnel and any other pertinent field observatkma also recorded on the submittal edher on water ice in a cooler such as when in the field or n field excavation or bonng log refrigerator at Apex s office Chainwt-custody forma are used to record possession o1 the sample from SOP-12 time of collection to arrival at the laboratory Dunng shipment the person with custody of the samples wd relinquish them to the nexl person by MEASURING LIQUID 1_)=VELS USING WATER signing the chain-of-custody form(s)and noting the dale and time the LEVEL METER OR INTERFACE PROBE sample-control officer at the laboratory wt1 verify sample integrity correct preservation confirm Collection in the proper container(s),and ensure adequate volume for analyses. Field equipment used for liquid-level gauging typically includes the measurtng instrument (waler-ievei meter or interface probe)and product If these conditions are mel the samples wig be assigned unique laboratory bailers) The field kit also induces cleaning supplies(buckets solution log numbers for identification throughout anaysn and reporting The log spray bottles and detonued watery to be used in Gearing the equipment numbers will be recorded on the chain-of-custody fame and in the legally- between watt; required log book maintained In the laboratory The sample descnptlon date recorded cilent s name and any other relevant Information will also Prior to measurement the instrument tip is lowered into the wed until 1 be recorded touches bottom Using the previously established top-ot-Casng or top-ot- box(i a weilheed vauti)point the probe cord(or halyard) is marked and a SOP-5 measunng tape (graduated in hundredths of a foot) is used to determine the distance between the probe end and the marking on the Cord This LABORATORY ANALYTICAL QUALITY measurement is then recorded on theligwd-leve!data sheet as the ASSURANCE AND CONTROL Measured Total Depth'of the wed When necessary inusng the interface probe to measure liquid levels the In addition to routine instrument caiibratlon repkates spikes blanks probe is first electrically grounded to either the metal stove pipe or another spiked blanks and condled reference matenals ars routinely analyzed at metal object nearby, When no ground is available reproducible method-specfic frequencies to monitor precrsron and bias Additional measurements can be obtained by clipping the ground lead to the handle components of the laboratory Quality AssurancerOuality Control program of the interface probe rase include The probe tip is then lowered Into the well and submerged in the 0Participation in state and federal laboratory to ndwater An oscillatchg(beeping)tone indicates the probe n in water accrsditadorvicertfication programs =robe is slowly raised until either the oscillating tone ceases or becomes a steady tone In edher case the is the depth-to-water(OTW) 2 Participation in both U S EPA Performance Evaluation studies indication and the DTW measurement Is made accordingly The steady (WS and WP studies)and lnter-iaborwory performance tone indicates floating liquid hydrocarbons(FLH) to this case the probe is evaluation programs slowly mood until the steady tone ceases This a the depth-lo-product (OTP)Indication and the DTP measurement is made accordingly Standard a maintenance procedures describing routine and periodic Instrumenttoperating maintenThe process of lowering and raising the probe must be repeated several times to ensure accurate measurements The DTW and DTP 4 Oul-of-Control'!Corrective Action documentation procedures measurements are recorded on the liquid-level data sheet When FLH are and srxiicated by the probe s response a product bader is lowered parttaty through the FLM-water interface to confirm the FLH on the water surface 5 MuftFlevei review of raw data and cilent reports and as further Indication of the FLH thickness particularly In cases where the FLH layer is qudo thin Thta measurement Is recorded on the data SOP-7 sheet as FLH ttdckneea' GROUNDWATER PURGING AND SAMPLING In order to avoid cross-contaminatlon of wails during the gquld•level measurement process wept are measured In the order of'dean to dirty' (where such intormadlon m available) In addition all measurement Prior to water sampling,each wet Is purged by evacuating a minimum of equipment Is cleaned with solution and thoroughly rinsed wrthdelonized three wetted weihcasrg volumes of groundwater When required.purg" water before use between measurements in respective waft and at the will continue ur ll efherthe discharge water temperature conductivity or completion of the day's use pH stabilize a maximum of tan wetted-caking volumes of groundwater have been recovered or the well is bailed dry When practical the groundwater sample shoukf be collected when the water levei In the well recovers to at least 80 porcamt of is static level The sampling equipment consists of either a Teflon"bailer PVC barer,or suMiesa steel bisdderpump with a'Teflon*bladder If the sampling system Is dedicated to the wet then the bailers usually Teflon but the bladder pump is PVC with a polypropylene bladder In general and depending on the Intended laboratory analysis 40-MY1RW glass volatile organic analysis(VOA)visis with-Tefioftsepta, are used as sample conlafnom The groundwater sample is decanted Into each VOA vial in such a manner that there is no meniscus at the top of the vial. A cap a quickly secured to the top of the viae The vial Is then inverted end gently lapped to we d air bubbles are preserf II none are present the vial islebeled and refrigerated for delivery under strict dudn-of custody to the anaythAd laboratory Label information should include a unique sample Identification number job IderrtCkation number date,time type of analysis requested,and the samplers name For quality control purposes a duplicate water sample Is collected from each wet This sample may also,be analyzed or put on hold at the laboratory When required. a trip blank prepared at the laboratory a placed in the transport cooler Itislabeled snrWar to the wallsarrples