Laserfiche WebLink
March 30, 2022 <br />Work Plan 0870.W1 <br /> <br /> <br />Page 2 of 3 <br /> P&D ENVIRONMENTAL, INC. <br />SCOPE OF WORK <br /> <br />P&D will perform the following tasks for borehole drilling and soil sample collection. <br /> Permitting, mark drilling locations for Underground Service Alert notification, and <br />prepare and implement a health and safety plan. <br /> Drilling at two proposed locations for soil sample collection. <br /> Arrange for laboratory analysis of soil samples. <br /> Report preparation. <br /> <br />Each of these is discussed below. <br /> <br />Permitting and Health and Safety Plan Preparation <br /> <br />Permits will be obtained from the San Joaquin County Environmental Health Department <br />for borehole drilling. A health and safety plan will be prepared for the scope of work <br />identified in this work plan. In addition, the proposed drilling locations will be marked <br />with white paint and Underground Service Alert will be notified for underground utility <br />location. All necessary permit-related notifications will be made prior to drilling. The City <br />surveyor has staked and marked with orange paint the excavation area so that the soil <br />borings are not accidentally drilled in the wrong locations. <br /> <br />Borehole Drilling and Soil Sample Collection <br /> <br />Two proposed boreholes will be continuously cored each to a depth of 18 feet bgs using a <br />dual tube Geoprobe drill rig. In each borehole one soil sample will be collected at a depth <br />of 4.0 feet bgs and one soil sample will be collected at a depth of 12.0 feet bgs for <br />laboratory analysis. <br /> <br />The boreholes will be drilled using a Geoprobe macrocore barrel sampler lined with <br />transparent PVC sleeve liners for soil sample collection. Subsurface materials encountered <br />in the boreholes will be logged in the field in accordance with standard geologic field <br />techniques and the Unified Soil Classification System (USCS), and will be evaluated with a <br />Photoionization Detector (PID) equipped with a 10.6 eV bulb that will be calibrated with a <br />100 parts per million (ppm) isobutylene standard. The soil will also be evaluated for other <br />evidence of contamination such as odors, staining, and discoloration. The subsurface <br />materials and observations will be recorded on boring logs. <br /> <br />Soil samples will be retained from the boreholes for laboratory analysis by cutting 6-inch <br />long sections of the Macrocore barrel sampler PVC liner for the desired sample depth and <br />sequentially covering the ends of the selected section of PVC liner with aluminum foil <br />sheets and plastic endcaps. Following evaluation and collection, the soil samples will be <br />labeled and placed into a cooler with ice pending delivery to the laboratory. Chain of <br />custody procedures will be observed for all sample handling. All drilling equipment will be <br />cleaned with an Alconox solution wash followed by a clean water rinse prior to use at each <br />location.