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temporarily stored untii the first opportunity for submittal
<br /> either on ice in a cooler,such as when in the field,or in a S. Multi-level review of raw data and client reports.
<br /> refrigerator at Apex's office.
<br /> SOP-7
<br /> SOP-4 HOLLOW-STEM AUGER MONITORING:WELL
<br /> SOIL.CLASSIFICATION INSTALLATION AND DEVELOPMENT
<br /> Soil samples are classified according to the Unified Sol[ Boreholes for monitoring wells are drilled using a tmck-
<br /> Classlficallon System. Representative portions of the mounted,hollow-stem auger drill rig. The borehole diameter
<br /> samples may be submitted,under strict chain-of-custody,to will be a minimum of four inches larger than the outside
<br /> an analytical laboratory for further examination and diameter of the casing when installing well screen. The
<br /> verification of the in-field classification and analysis of soil hollow-stem auger provides minimal interruption of drilling
<br /> mechanical and/or petrophysical properties. The soil types while permitting soil sampling at desired intervals. Soil
<br /> are Indicated on logs of either excavations or borings samples are collected by either hammering(with a 140-
<br /> together with depths corresponding to the sampling points pound drop hammer)or hydraulically pushing a conventional
<br /> and other pertinent information. split-barrel sampler containing pre-cleaned two inch-
<br /> diameter brass tubes. A geologist or engineer from Apex
<br /> SOP-5 Envirotech,Inc.,continuously logs each borehole during
<br /> SAMPLE IDENTIFICATION AND-CHAIN-OF-CUSTODY drilling and constantly checks drill cuttings for indications of
<br /> PROCEDURES both the first recognizable occurrence of groundwater and
<br /> volatile hydrocarbons using either a PiD,FID,or an
<br /> Sample identification and chain-of-custody procedures explosimeter. The sampler is rinsed between samples and
<br /> ensure sample integrity as well as document sample either steam cleaned or washed with all other drilling
<br /> possession from the time of collection to ultimate disposal, equipment between borings to minimize the potential for
<br /> Each sample container submitted for analysis is labeled to cross-contamination.
<br /> Identify the job number,date,time of sample collection,a
<br /> sample number unique to the sample,any in-field Monitoring wells are cased with threaded,factory-perforated
<br /> measurements made,sampling methodology,name(s)of and blank Schedule 40 PVC. The perforated interval
<br /> on-site personnel,and any other pertinent field observations consists of slotted casing,generally with 0.020-inch wide by
<br /> also recorded on the field excavatron or boring log. 1.5 Inch long slots,with 42 slots per foot. A PVC cap may
<br /> be secured to the bottom of the casing with stainless steel
<br /> Chain-of-custody forms are used to record possession of the screws;no solvents or cements are used. Centering devices
<br /> sample from time of collection to arrival at the laboratory. may be fastened to the casing to ensure even distribution of
<br /> During shipment,the person with custody of the samples will filter material and grout within the borehole annulus. The
<br /> relinquish them to the next person by signing the chain-of- well casing is thoroughly washed and/or steam cleaned,or
<br /> custody form(s)and noting the date and time. The sample- may be purchased as pre-cleaned,prior to Installation.
<br /> control officer at the laboratory will verify sample integrity,
<br /> correct preservation,confirm collection in the proper After setting the casing inside the hollow-stem auger,sand
<br /> container(s),and ensure adequate volume for analysis. or gravel filter material is poured into the annular space to till
<br /> from boring bottom to generally one foot above the
<br /> If these conditions are-met,the samples will be assigned perforated interval. A one to two foot thick bentonite plug is
<br /> unique laboratory log numbers for Identification throughout set above this filter material to prevent grout from infiltrating
<br /> analysis and reporting. The log numbers will be recorded on the filter pack. Either neat cement,containing about five
<br /> the chain-of-custody forms and in the legally-required log percent bentonite or sand-cement grout is then tremmied
<br /> book maintained in the laboratory. The sample descrlptbon, into the annular space from the top of the bentonite plug to
<br /> date received,client's name,and any other relevant near surface. A traffio-rated vault Is Installed around each
<br /> information will also be recorded. wellhead for wells located in parking lots or driveways,while
<br /> SOP-ti
<br /> steel"stovepipes'are usually set over wellheads in LABORATORY ANALYTICAL.QUALITY ASSURANCE landscaped areas.
<br /> AND CONTROL After installation,the wells are thoroughly developed to
<br /> remove residual drilling materials from the wellbore,and to
<br /> In addition to routine instrument calibration,replicates, improve well performance by removing fine material from the
<br /> spikes,blanks,spiked blanks,and certified reference filter pack that may pass into the well. Well development
<br /> materials are routinely analyzed at method-specific techniques used may include pumping,surging,bailing,
<br /> frequencies to monitor precision and bias. Additional swabbing,jetting,flushing,and air-lifting. All development
<br /> components of the laboratory Quality AssuranceJQuality water is collected either in drums or tanks for temporary
<br /> Control program include: storage,and properly disposed of depending on laboratory
<br /> analytical results. To minimize the potential for cross-
<br /> i. Participation in state and federal laboratory contamination between wells,all development equipment is
<br /> accreditatlon/certification programs; either steam cleaned or properly washed prior to use.
<br /> Following development,the well is allowed to stand
<br /> 2. Participation in both U.S_EPA Performance Evaluation undisturbed for a minimum of 24 hours before Its first
<br /> studies(WS and WP studies)and inter-laboratory sampling.
<br /> performance evaluation programs;
<br /> SOP-8
<br /> 3. Standard operating procedures describing routine and ROTARY DRILLING MONITORING WELL INSTALLATION
<br /> periodic instrument maintenance; AND DEVELOPMENT
<br /> 4. "Out-of-Control"/Corrective Action documentation Boreholes for monitoring wells may be drilled using truck-
<br /> procedures;and, mounted drill rigs capable of air-and mud-rotary drilling,and
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