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Geologicd Teckntcs Inc Page 7 <br /> ' Soil and Groundwater Investigation Work Plan <br /> Cardoza (Maur St) <br /> Project No 662 2 <br /> January 17,2003 <br /> ' • Disposable loves will be used b the technician to collect all samples and will be <br /> P g Y p <br /> changed with each sampling event <br /> ' • A bailer blank for each well will be collected prior to sampling by filling the <br /> decontaminated stainless steel bailer with water (provided by the laboratory) and then <br /> filling a VOA vial (provided by the laboratory) using the same procedures for actual <br /> sample collection <br /> Bailer blanks for each sample, along with a field blank (prepared from water provided by <br /> the laboratory poured into a VOA vial on site) will accompany the samples to the laboratory <br /> and serve as checks against cross contamination <br /> A chain of custody document, listing all samples collected, accompanies the samples from <br /> ' field to laboratory, thereby providing a means to track their movement and insure their <br /> integrity a <br /> ' All water purged from each monitoring well and not used as a sample, will be placed in a 55 <br /> gallon DOT approved container, properly labeled and stored on site until its proper <br /> disposition can be arranged <br /> ' 4.2 Groundwater Laboratoi y Analyses <br /> Groundwater samples from each well will be submitted to Sherwood Labs (State Certified <br /> Laboratory #1400) for analysis for <br /> • Benzene, toluene, ethylbenzene and xylene (BTEX) by EPA method 602/5030 <br /> • Gasoline range petroleum hydrocarbons (TPH-G) by EPA method 503018015(m) <br /> ' • Gasoline oxygenates (MTBE, D1PE, ETBE, TAME & TBA) by EPA method 8260 <br /> 1,i T)(-A, f eDP <br /> ' The detection limits for these compounds are listed below A Chain of Custody will be <br /> completed for all samples collected and tracked to ensure sample integrity <br /> ' Detection Limits BTEX I gs= - <br /> �Nater pg -0 <br /> ' S 0 CONTAMINANT DISTRIBUTION & MASS ESTIMATION CALCULATIONS <br /> Through interpretation and extrapolation of the data generated through the history of the <br /> project, the distribution of the contamination, both laterally and vertically, will be <br /> determined The contaminant distribution infonnation will then be used in estimation of the <br /> contaminant mass <br /> Mass estimate calculations will be perfonned to determine the mass of gasoline present at <br /> this site To accomplish this task the soil analytical data obtained from previous <br /> ' investigations will be used and representative groundwater monitoring data The <br /> calculations divide up the contaminated zone into a series of layers according to geology A <br /> cylinder shape is used to estimate the volume of soil that has been impacted in each layer <br />