WORK PLANS - Laserfiche WebLink

Home Browse Search

Soil Boring Advancement Soil borings (SB-1 throught S13-5) will be advanced to an approximate depth of 40 fbg, at the proposed locations shown on Figure 1, using a truck-mounted direct-push drill rig equipped with 2.5-inch outside- diameter sampling rods. The borings will be advanced using a truck-mounted direct-push drill rig.The initial 8 feet of each soil boring will be cleared of underground utilities using a hand auguring tool. Soil samples for chemical analyses will be collected at 5-foot intervals and at zones with elevated photo-ionization detector (PID) readings during the advancement of each boring. Soil samples collected to 8 fbg will be collected with a hand auger and transferred directly to pre-cleaned 6-inch by 2-inch diameter steel sleeves. Remaining samples will be directly collected into acetate sleeves using the contracted direct-push drill rig. All soil samples will be lined with Teflon sheets, capped, sealed, and labeled. Soil will be screened in the field for VOCs using a photo-ionization detector (PID). Soil will be classified according to the Unified Soil Classification System (USCS). Stantec will record soil types, PID readings, and other pertinent soil conditions on the boring logs. Boreholes will be backfilled with cement-bentonite grout to surface, allowed to settle, and capped off with concrete at the surface to match the existing site finish. All drilling and auguring equipment will be cleaned in an aqueous non-phosphate solution cleanser, rinsed with tap water, and rinsed a second time with deionized water prior sample collection and between sample intervals to prevent cross-contamination. Drilling activities will be supervised by a qualified field staff working under the supervision of a State of California Professional Engineer. Laboratory Analysis Soil samples collected for chemical analysis will be labeled, placed in a resealable plastic bag, and stored in an ice-chilled cooler for transport to a California Department of Health Services (CADHS)-certified laboratory under chain-of-custody procedures. Samples will be analyzed for the following analytes and in accordance with the appropriate EPA Method: • Total Petroleum Hydrocarbons gasoline range organics (GRO) and VOCs including benzene, toluene, ethylbenzene, total xylenes (BTEX) and fuel oxygenates methyl tertiary butyl ether (MTBE), di-isopropyl ether(DIPE), ethyl-tertiary-butyl ether(ETBE), tertiary-amyl-methyl ether (TAME), tert-butanol (TBA), and ethanol] by US EPA Test Method 8260B • Diesel range organics (DRO), and oil range organics (ORO) using US EPA Test Method 8015M. • Title 22 Metals by US EPA Test Method 601013. Waste Disposal Soil waste and decontamination water generated during drilling activities will be placed into Department of Transportation (DOT)-approved 55-gallon steel drums. The drums will be labelled and temporarily stored onsite pending off-site disposal by a licensed waste hauler. The waste will be characterized by using laboratory analytical results from soil sampling. Following waste characterization, the drummed waste will be disposed off-site in accordance with State and Federal regulations.