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<br /> temporarily stored until the first opportunity for submittal
<br /> _ either on ice in a cooler, such as when in the field, or in a 5. Multi-level review of raw data and client reports.
<br />'i refrigerator at Apex's office.
<br /> _ SOP-7
<br /> Ii I SOP-4 HOLLOW-STEM AUGER MONITORING WELL
<br /> SOIL CLASSIFICATION INSTALLATION AND DEVELOPMENT
<br /> Soil samples are classified according to the Unified Soil Boreholes for monitoring wells are drilled using a truck-
<br /> , - � Classification 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 forfurther 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 /> l 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 /> -I 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 excavation 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 /> I - 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 fill
<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 description, 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 traffic-rated vault is installed around each
<br /> information will also be recorded. wellhead for wells located in parking lots or driveways, while
<br /> steel "stovepipes" are usually set overwellheads in
<br /> SOP-6 landscaped areas.
<br /> LABORATORY ANALYTICAL QUALITY ASSURANCE
<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 Assurance/Quality 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 /> 1 . Participation in state and federal laboratory contamination between wells, all development equipment is
<br /> accreditation/certification programs; either steam cleaned or properly washed prior to use.
<br /> 11 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 /> J 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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