WORK PLANS - Laserfiche WebLink

Home Browse Search

analyzed for the presence VOCs in accordance with EPA Method 8260B and TPH-cc in accordance with EPA Method 8015M. Up to nine soil samples (three per boring) will be collected from borings B12, B13 and 1314. One soil sample from each boring will be selected for laboratory analysis based on field observations and at areas where photoionization detection (PID) readings are elevated above background.The selected soil samples will be analyzed for the presence VOCs in accordance with EPA Method 826013, TPH-cc in accordance with EPA Method 8015M, polychlorinated biphenyls (PCBs) in accordance with EPA Method 8082, Title 22 Metals in accordance with EPA Method 6010/200.7, and semi-volatile organic compounds (SVOCs) and polycyclic aromatic hydrocarbons (PAHs) by Selective Ion Monitoring (SIM) in accordance with EPA Method 8270C. 5.4 Proposed Monitoring Well Installation Methods Groundwater monitoring well borings MW-1, MW-2 and MW-3 will be advanced to a total depth of 35 feet bgs using a truck-mounted HSA drill rig. A groundwater monitoring well will be constructed within the auger column of borings MW-1, MW-2 and MW-3 to a depth of 10 feet below depth to groundwater, which is anticipated to be at 25 feet bgs, for a total well depth of approximately 35 feet bgs. The monitoring wells will consist of a 15 foot section of 2-inch diameter, 0.020-inch slotted schedule 40 polyvinyl chloride (PVC) screen at the terminal end, extending approximately 10 feet below depth to groundwater and five feet above depth to groundwater;and 2-inch diameter schedule 40 PVC blank riserto the ground surface.The terminal end of each monitoring well will be fitted with a PVC end cap and the PVC screen and riser segments will be attached with threaded connections. The well casing will be suspended approximately 6-inches above the terminal depth and the boring annulus will be backfilled from the terminal depth upwards with sand to approximately 2 feet above the well screen, followed by a 3-foot bentonite seal and cement grout from the top of the seal to the ground surface. During well construction the wells will be periodically surged to settle the well screen filter pack. A flush- mounted, traffic-rated well vault will be emplaced to provide access to the wellhead. Details of the monitoring well construction are provided in Figure 3. Additional Site Assessment Work Plan Heliostockton Property 434 Dr.Martin Luther King Jr. Boulevard Stockton,California Partner Project Number SM17-191672 RWQCB Case#:392004 January 9,2018 Page 11