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8700 Thornton Road Page 3 <br /> Work Plan—Soil Boring Installation <br /> ' GPE Project No.639.2 <br /> May 18,2011 <br /> ' 2.2 Sampling and Analyses <br /> P g Y <br /> While drilling, each boring will be continuously sampled. Soil samples will be screened <br /> ' using field methods by observing discoloration and odor. If no field evidence of vadose <br /> zone contamination is found, soil samples are unlikely to be submitted for laboratory <br /> ' analysis except for the bottom samples. <br /> Soil samples are collected using a 4-foot long by 1.25 inch inside diameter drive sampler <br /> lined with a plastic sample sleeve. Upon retrieval, soil samples at 4-foot intervals will be <br /> logged and sample material retained for possible laboratory analysis will be sealed with <br /> plastic endcaps fitted over the sample sleeve, and a representative section of each 4-foot <br /> ' sample section will be labeled and placed in an ice chest chilled to 4 degrees C. <br /> Each sample container will then be labeled and placed into an ice chest chilled to 4°C to <br /> await transport to the laboratory under chain of custody protocol. <br /> All sampling equipment will be thoroughly cleaned before and between uses. No soil <br /> cuttings will be generated during the Geo-Probe drilling process. Samples selected for <br /> laboratory analysis will be submitted to a Argon Analytical, a State Certified analytical <br /> laboratory and tested as follows: <br /> ' • Total Extractable Petroleum Hydrocarbons TEPH-D b EPA method 8015 m <br /> Y ( ) Y ( ) <br /> • Total gasoline range Petroleum Hydrocarbons (TPH-G) by EPA method 8015(m), and <br /> • BTEX Volatile Organic Compounds using EPA method 8021. <br /> The following table summarizes the detection limits of various constituents: <br /> Compound TPH TEPH BTEX MTBE <br /> Detection Limit 1 5 0.5 0.05 <br /> Units Mg/Kg Mg/Kg Mg/Kg Mg/Kg <br /> If no petroleum contamination is detected by field methods (staining, odor, PID), only the <br /> bottom sample will be tested. If contamination is detected, it is likely that additional <br /> ' samples will be tested. If no TPH or BTEX compounds are detected, the method used to <br /> test for gasoline oxygenates will be EPA 8021. If any TPH or BTEX contamination is <br /> detected, oxygenates will be tested using EPA 8260. <br /> 1 <br /> 2937 Veneman Ave.,#13240 Geo-Phase Environmental Inc. Phone(209)569-0293 <br /> Modesto,CA 95356 Fax(209)569-0295 <br />