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DocuSign Envelope ID: FC9986C3-F179-4A3D-BACO-D8CA9F8B93A7 <br /> Proposal for Additional Remedial Investigation <br /> Hillsborough Dump <br /> IMow ID No. NONCD0000483 <br /> Task Orders 483DP-19 thru 25 <br /> S&ME Project No.4305-17-061G <br /> Task 483DP-20 Potable Well Sampling and Analyses <br /> NCDEQ's November 5, 2021 letter lists seven locations where potable wells will be sampled.These locations were <br /> identified in S&ME's previous report Remedial Investigation-First Phase Report,January 24, 2018. S&ME will <br /> coordinate with the County to acquire access agreements for the potable well sampling. Sampling will be <br /> conducted in accordance with NCDEQ PRLF Guidelines. The seven potable well samples will be analyzed by a <br /> North Carolina certified laboratory by the following analytical methods: <br /> Volatile Organic Compounds (VOCs) by Method 8260 <br /> 1.4-dioxane by Method 8260 SIM <br /> Semi-Volatile Organic Compounds (SVOCs) by Method 8270 <br /> Metals by totals analysis(antimony, arsenic, beryllium, cadmium, chromium, copper, iron, lead, <br /> manganese, mercury, nickel, selenium, silver,thallium, and zinc) by Methods 6020 and 7471 <br /> Ammonia by Method 350.1 or 9050 <br /> Nitrate and Sulfate by Method 300 or 9056 or 353.2 <br /> Task 483DP-21 Sampling and Analysis of Surface Water and Sediments <br /> Media samples will include surface water and stream sediment and will be collected by the methods described in <br /> S&ME's Standard Operating Procedures and Quality Assurance(SOP/QA)Manual(July2010), previously approved <br /> by NCDEQ. Media samples will be analyzed by a North Carolina certified laboratory by the following analytical <br /> methods: <br /> VOCs by EPA Method 8260 <br /> 1,4-Dioxane by Method 8260 SIM <br /> SVOCs by Method 8270 <br /> Metals by totals analysis (antimony, arsenic, beryllium, cadmium,chromium,copper, iron, lead, <br /> manganese, nickel,selenium,silver,thallium,and zinc) by Method 6020 and 7470/7471 <br /> Ammonia by Method 350.1 or 9050; <br /> Nitrate and Sulfate by Method 300 or 9056 or 353.2 <br /> S&ME will collect surface water and sediment samples at the 12 locations shown on the attached site map(Figure <br /> 1) according to our SOP/QA Manual. The coordinates of the surface water and sediment sample location will be <br /> recorded by S&ME with a GPS unit. S&ME field personnel will also take photographs of each sample location, <br /> stream sampling activities, and site conditions/areas of interest(stream conditions such as the exposed waste <br /> along the streambank on the southern portion of the site) relevant to future assessment and eventual remediation <br /> of the site. <br /> S&ME will collect the samples in a downstream-to-upstream order. If the surface water samples are highly turbid, <br /> samples will be collected in separate collection containers and then decanted into the laboratory supplied sample <br /> containers. For the purposes of quality assurance,the samples for metals analysis will be allowed to settle for a <br /> maximum of five minutes. Collection containers will be supplied by the laboratory and will consist of the same <br /> materials as the sample containers. <br /> March 10, 2022 3 <br />