Orange County NC Website
Robert Williams <br />September 28, 2023 – Orange Grove Rd W&R Center – Supplemental Tasks #2 <br />Page 2 of 6 <br /> <br />ii. This fee is based on the stake out of project limits on plans developed by Draper <br />Aden/DAA/TRC. Property boundary is shown on said plans and will be used for <br />calculations of location of project limits. <br />iii. DAA/TRC will provide field support and quality control with office staff including <br />project surveyors, survey technicians and licensed surveyors to complete the <br />requested stakeout. Support will include computation of the locations of the <br />requested items along with QA/QC review of data. <br />iv. This is not a boundary survey and is only for onsite visual presentation purposes. <br />v. No deliverable is proposed for this task, other than flagging in the field. <br />vi. Should stakes or flagging be lost due to site operations, tampering, or other reasons <br />outside of TRC’s control, re-staking will be considered an additional service. <br /> <br />Task 2 – Environmental Sampling: DAA/DAA/TRC will mobilize to the site of the proposed Orange <br />County Solid Waste facility to conduct an assessment of existing soil and groundwater conditions. <br />The purpose of our assessment will be to identify baseline (background) soil and groundwater <br />conditions and evaluate potential impacts (if any) from the residuals spray irrigation field 11-8 <br />operated by Orange Water and Sewer Authority. <br /> <br />Soil Analysis: Our assessment will consist of the advancement of two soil borings on the northern and <br />southern portions of the site and the installation of two temporary groundwater monitoring wells. <br />The borings will be advanced with a truck-mounted Geoprobe® Direct Push Technology (DPT) rig. <br />Based on DAA/TRC’s knowledge of the regional groundwater elevations in the vicinity of the site, we <br />anticipate that groundwater will be encountered at a depth of 10-15 feet below land surface (bls). <br />We will collect a composite soil sample from each boring at four-foot intervals from acetate sleeves <br />until groundwater is encountered, transfer the samples into laboratory-supplied containers, and <br />submit the samples to a North Carolina-certified lab for analyses of the following: <br /> <br />Arsenic Iron Zinc <br />Aluminum Mercury Oil and grease <br />Barium Magnesium Nitrate <br />Calcium Manganese Nitrite <br />Copper Potassium Total Phosphorous <br />Cadmium Nickel <br />Total Chromium Lead <br />Groundwater Analysis: Following soil sampling, we will install the groundwater wells to a depth of 10- <br />15 feet below land surface (bls) using Geoprobe DPT. Following boring advancement, we will insert <br />five feet of 10 PVC slot screen material into each boring to bracket the stabilized water table and <br />connect the screened pipe to 10 feet of PVC solid riser pipe. We will construct the wells with a sand <br />pack that will be poured to a depth one foot above the top of the screen interval to isolate the <br />screened interval from the bentonite seal. We will then seal the well with bentonite pellets that will be <br />poured directly above and in contact with the sand pack and extend at least one foot or greater to <br />ground surface. <br />DocuSign Envelope ID: BB84C0E6-F492-4E59-8BE1-7BCC7B770892