Permits & Development - Encroachment(EP)/Driveway(DW) Permits - 2007_EP-07-201 thru EP-07-300_ - EP-07-263

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APEX ENVIROTECH INC. Upon recovery,a portion of the soil sample is sealed for later screening with either a portable photoionization detector, STANDARD OPERATING PROCEDURES flame ionization detector,or an explosimeter. Another portion of the sample is used for description of the excavated SOP-1 materials. A third portion of the sample is hermetically SOIL BORING SAMPLING sealed,labeled and refrigerated for delivery,under strict chain-of-custody,to the analytical laboratory. These During drilling,soil samples for chemical analysis are procedures minimize the potential for cross-contamination collected in thin-walled brass tubes,of varying diameters and and volatilization of volatile organic compounds prior to lengths(e.g.,4 or 6 inches long by 2 inches outside chemical analysis. diameter). Three or four of the selected tubes,plus a spacer tube,are set in an 18-inch long split-barrel sampler of the In the event the soil samples cannot be submitted to the appropriate inside-diameter, analytical laboratory on the same day they are collected(e.g., due to weekends or holidays),the samples are temporarily Where possible,the split-barrel sampler is driven its entire stored until the first opportunity for submittal either on ice in a length either hydraulically or using a 140-pound drop cooler,such as when in the field,or in a refrigerator at Apex's hammer. The sampler is extracted from the borehole and the office. brass tubes,containing the soil samples,are removed. Upon removal from the sampler,the selected brass tubes are SOP-3 either immediately trimmed and capped with aluminum foil or SOIL CLASSIFICATION "Teflon"sheets and plastic caps or the samples are extruded from the tubes and sealed within other appropriate,cleaned Soil samples are classified according to the Unified Soil sample containers. The samples are then hermetically Classification System. Representative portions of the sealed,labeled,and refrigerated for delivery,under strict samples may be submitted,under strict chain-of-custody,to chain-of-custody,to the analytical laboratory. These an analytical laboratory for further examination and procedures minimize the potential for cross-contamination verification of the in-field classification and analysis of soil and volatilization of volatile organic compounds(VOC)prior mechanical and/or petrophysical properties. The soil types to chemical analysis. are indicated on logs of either excavations or borings together with depths corresponding to the sampling points One soil sample collected at each sampling interval is and other pertinent information. analyzed in the field using either a portable photoionization detector(PID),flame ionization detector,organic vapor SOP-4 analyzer,catalytic gas detector,or an explosimeter. The SAMPLE IDENTIFICATION AND CHAIN-OF-CUSTODY purpose of this field analysis is to qualitatively determine the PROCEDURES presence or absence of hydrocarbons,and the samples to be analyzed at the laboratory. The soil sample is sealed in Sample identification and chain-of-custody procedures either a brass tube,glass jar,or plastic bag to allow for some ensure sample integrity as well as document sample volatilization of VOC. The PID is then used to measure the possession from the time of collection to ultimate disposal. concentrations of hydrocarbons within the containers's Each sample container submitted for analysis is labeled to headspace. The data is recorded on both field notes and the identify the job number,date,time of sample collection,a boring logs at the depth corresponding to the sampling point. sample number unique to the sample,any in-field measurements made,sampling methodology,name(s)of on- Other soil samples are collected to document the soil and/or site personnel,and any other pertinent field observations stratigraphic profile beneath the project site,and estimate the also recorded on the field excavation or boring log. relative permeability of the subsurface materials. All drilling and sampling equipment are either steam cleaned or washed Chain-of-custody forms are used to record possession of the in solution and doubly rinsed in deionized water prior to use sample from time of collection to arrival at the laboratory. at each site and between boreholes to minimize the potential During shipment,the person with custody of the samples will for cross-contamination. relinquish them to the next person by signing the chain-of- custody form(s)and noting the date and time. The sample- In the event the soil samples cannot be submitted to the control officer at the laboratory will verify sample integrity, analytical laboratory on the same day they are collected(e.g., correct preservation,confirm collection in the proper due to weekends or holidays),the samples are temporarily container(s),and ensure adequate volume for analysis. stored until the first opportunity for submittal either on ice in a cooler,such as when in the field,or in a refrigerator at Apex's If these conditions are met,the samples will be assigned office. unique laboratory log numbers for identification throughout analysis and reporting. The log numbers will be recorded on SOP-2 the chain-of-custody forms and in the legally-required log SOIL EXCAVATION AND SAMPLING book maintained in the laboratory. The sample description, date received,client's name,and any other relevant Excavation and subsequent soil sampling is performed under information will also be recorded. the direction of a registered geologist or civil engineer. To reduce the potential for cross-contamination,all excavation equipment is either steam cleaned or washed prior to use SOP-5 and between excavations. Soil samples for chemical LABORATORY ANALYTICAL QUALITY ASSURANCE AND analysis are collected in cleaned,thin-walled brass tubes of CONTROL varying diameters and lengths(e.g.,6 inches long by 2 inches outside diameter)or other appropriate cleaned In addition to routine instrument calibration,replicates, sample container. If used,one tube may be set in a 2-inch spikes,blanks,spiked blanks,and certified reference inside diameter,hand-driven sampler. To reduce the materials are routinely analyzed at method-specific potential for cross-contamination between samples,the frequencies to monitor precision and bias. Additional sampler is washed in a solution and doubly rinsed between components of the laboratory Quality Assurance/Quality each sampling event. Control program include: