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S E C 0 R <br /> 7-Eieven Store#14117 <br /> Field Test for Evaluation of Oxidation Capacity of Groundwater <br /> July 22, 2004 <br /> Page 5 <br /> pack Periodic measurements of pH, conductivity and temperature will be made during <br /> development to establish baseline values for groundwater Approximately 10 well volumes <br /> will be removed from the well during development All water generated during the <br /> development activities will be stored in Department of Transportation (DOT) approved 55- <br /> gallon drums pending disposal <br /> Waste Disposal <br /> Soil cuttings and Ansate water generated during drilling operations will be temporarily <br /> stored onsite In properly labeled Department of Transportation (DOT) approved 55-gallon <br /> drums pending characterization and disposal The soil and rinsate water will be removed <br /> by SECOR's disposal contractor to an appropriate disposal facility The drums will be <br /> temporarily stored onsite for approximately 2-3 weeks <br /> OXYGEN INJECTION FIELD TEST DETAILS <br /> Prior to initiation of oxygen injection, groundwater samples will be collected from the <br /> proposed injection well and the adjacent observation well (MW-1) located within the radius <br /> of influence of injected oxygen Analysis of the groundwater samples for general inorganic <br /> constituents and dissolved metals will provide baseline groundwater chemistry data for the <br /> site Specific protocols and methods will be used in conducting the groundwater sampling <br /> as described In the following paragraphs <br /> The depth to water will be measured to within 0 01 feet in the injection well and observation <br /> well from top of casing (TOC) using a water level indicator Dissolved oxygen will also be <br /> measured in each well using a YSI Model 550A dissolved oxygen meter equipped with a <br /> down hole sensor Both the oxygen injection well and the observation well will be purged <br /> prior to collecting groundwater samples in order to assure that water standing in the well <br /> and well casing is removed and that a representative groundwater sample is collected <br /> Well purging and sampling equipment will be thoroughly cleaned prior to purging and <br /> sampling the injection well and observation well Each well will be purged of approximately <br /> three casing volumes of water (or to dryness) using a submersible pump or bailer During <br /> purging, temperature, pH, and electrical conductivity will be monitored to document that <br /> these parameters stabilize prior to collecting samples Following purging, the groundwater <br /> level in each well will be allowed to recover to at least 80% of the original level prior to <br /> collection of the water sample Ferrous iron (Fe+2) concentrations will be measured in each <br /> well using a Hach field test kit immediately following well purging In addition, dissolved <br /> oxygen concentrations will be measured in each well after the groundwater level has <br /> recovered and prior to sample collection <br /> Groundwater samples will be collected using a disposable Teflone bailer All groundwater <br /> samples will be filtered in the field using a disposable 0 45 micron filter prior to being placed <br /> into appropriate containers, preserved where applicable, labeled, logged onto a chain-of- <br /> custody document, and transported on ice to a California state-certified laboratory Copies <br /> of field notes will be included as an attachment In the report <br /> 14117 Field Test Oxidalion Capacity doc SECOR International Incorporated <br />