ARCHIVED REPORTS XR0011678 - Laserfiche WebLink

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Mr. Michael Infurna December 1 fi, 1991 02320 1837 Page 2 TASK 2: ADDITIONAL EXCAVATION In order to obtain approval for closure of the former tank pit, Groundwater Technology proposes to overexcavate and collect clean samples from the waste oil tank pit approximately 3 feet in each direction (Figure 2). The original dimensions of the excavation are 5.5'X11'X10' (Figure 2). The new dimensions will be approximately 8.5'X14'X13'. This excavation will be performed utilizing a excavator with a 40-Hour OSHA trained operator. The excavation is estimated to take approximately one day. All site safety and security protocol will be in accordance with Cal-OSHA standards, as referenced in the site safety plan. TASK 3: SOIL SAMPLING Upon completion of the excavation, five soil samples will be taken as specified in the California Regional Water Quality Control Board LUFT Manual and determined by the site representative, from the bucket of the excavator (Figure 3). Four samples will be taken from the bottom of the excavation at the midpoint of each wall, and one from the center of the bottom of the excavation. The soil samples will be screened for volatile compounds utilizing a photoionization detector. The soil samples will be described (using the Unified Soil Classification System) by a Groundwater Technology field geologist, working under the supervision of a California Registered Geologist. The sample will be sealed with aluminum foil, capped, taped, labeled, and placed on ice in an insulated container. TASK 4: LABORATORY ANALYSES Groundwater Technology will submit the previously described soil samples to be analyzed by a State-certified laboratory for benzene, toluene, ethylbenzene and total xylenes (BTEX), total petroleum hydrocarbons-as-gasoline (TPH-G) by EPA-approved Methods 5030/8020/8015, and Metals (Ba, V, Cu, Ni) using the STLC extraction method. If the levels exceed the state mandated action levels then the California Waste Extraction Test is to be performed for those species above the STLC limit. TASK 5: SOIL STORAGE & DISPOSAL All soil generated during the site activities will be stored on site. Approximately, 139 cubic yards are currently stockpiled at the site pending characterization and disposal at an approved facility to be determined upon characterization of the final stockpile. The final . stockpile amount is estimated to be approximately 300 cubic yards. Storage of the current stockpiled soil on site was witnessed and approved by Charlie Hunt of the San �LjkiGROUNDWATER T,11 TECHNOLOGY,INC.