Laserfiche WebLink
-.0 <br /> CLEARWA'd-ER <br /> G R O U P, I N C. <br /> intervals in two borings. One boring will be continuously cored in order to provide <br /> a detailed evaluation of subsurface' lithology. Soil samples will be collected into <br /> brass tubes by hand at five foot intervals from ffie continuous core. <br /> Portions of each soil sample will be retained fo a visual lithologic description by a <br /> Clearwater geologist using the Unified Soil Classification System, and for volatile <br /> organic headspace analysis using, a photo-ionization detector (PID). PID readings <br /> will be recorded. on the well logs and will be used to help select soil samples for <br /> laboratory analysis. Soil cuttings generated from. drilling will be .wrapped in plastic <br /> and stored on-site, pending 'future removal and disposal by a licensed waste hauler. <br /> Soil samples collected for analysis will be labeled,. documented on a chain-of-custody <br /> form, and placed in a cooler for transpo t to PACE Inc., a State-certified <br /> environmental laboratory located in Novato, California. Two soil samples from. <br /> each soil boring will be analyzed for TPHd y EPA Method 8015; and benzene, <br /> toluene, ethylbenzene, and total xylenes (BTEX) by EPA Method 8020. <br /> -2.2 Monitoring Well Installation, Developmen and Survey <br /> A two-inch diameter monitoring well will be in Called in each boring. If allowed by <br /> physical. constraints (utilities, etc.), at least one well will be located in the anticipated <br /> do-wrigra.dient direction of the former UST's. Each well will be constructed of <br /> Schedule 40 PVC, and will,consist of 15 feet of 0.020 inch slotted well screen at the <br /> base gush threaded-to 15 feet of blank PVC riser extending to the surface (Figure 3). <br /> Siiica sand filter pack will be placed around -t1he screen to a depth of 14 feet below <br /> grade. A one-foot thick bentonite seal will b . placed above the sand pack. The <br /> remaining well annulus will.be filled with Portland cement. The wells will be fitted <br /> with locking expansion caps and completed at rade in trafficrated manhole boxes. <br /> The monitoring wells will be developed by alternating surging and bailing. If <br /> possible ten wetted well casing volumes will be removed during development of <br /> each well. Top of casing elevation for each well will surveyed to a temporary <br /> benchmark established at the site. <br /> 2.3 Groundwater Gauging, Sampling and Anal sis <br /> All monitoring wells will be sampled after installation and development. Prier to <br /> sampling, all wells will be purged of standing water until sampling; parameters <br /> (terxa.perat�_ire, pl~1 and conductivity) have stabi ized. Well purging intorAnaiion will <br /> be presented on Gauge Data/Purge Calculations and Purge Data sheets. <br /> D-104 WI WORKPLAN . 2 January 19., 1995 <br />