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ARCADIS
<br />facilities included four service bays, three dispenser islands, one sales kiosk, three
<br />10,000 -gallon gasoline underground storage tanks (UST), one 1,000 -gallon used -oil
<br />UST, one 550 -gallon previously abandoned used -oil UST, and one hydraulic hoist.
<br />All facilities associated with the former Chevron were removed during August of
<br />1998. The site is bound to the west by South Lee Avenue, to the east by South
<br />Pleasant Avenue, to the south by Kettleman Lane, and to the north by residential
<br />areas. The site is currently operated as a Prime Shine Express Car Wash and Auto
<br />Lube Center.
<br />Well Destruction and System Decommissioning Activities
<br />Between March 2 and March 17, 2009, Cascade Drilling Incorporated (Cascade) of
<br />Rancho Cordova, California, under the supervision of ARCADIS, destroyed 27
<br />groundwater monitoring wells (MW -1, MW -2, MW -3, MW -4, MW -5A, MW -5B, MW -6,
<br />MW -7A, MW -7B, MW -8A, MW -8B, MW -8S, MW -9A, MW -9B, MW -10A, MW -10B,
<br />MW -10C, MW -11A, MW -11B, MW -12A, MW -12B, MW -13, MW -17B, MW -18B, MW -
<br />19C, MW -20A, and MW -20B), three groundwater extraction wells (EX -1, EX -2, and
<br />EX -3) and four vapor extraction wells (VE -1, VE -2, VE -3, and VE -4). Groundwater
<br />extraction well EW -1 was destroyed by removing the well box and over-drilling with
<br />14 -inch outside diameter (OD) hollow stem augers (HSA) to total completion depth
<br />(65 feet below ground surface [bgs]) to remove all material (e.g. casing, filter pack,
<br />annular seal, etc.) associated with the well. The borehole was then pressure grouted
<br />from the bottom of the bore hole to surface grade using a tremie pipe and cement
<br />bentonite grout.
<br />The well boxes were removed from the remaining groundwater extraction wells,
<br />vapor extraction wells and all monitoring wells. The wells were then pressure grouted
<br />from the bottom to surface grade using a tremie pipe and cement bentonite grout.
<br />The upper 3 feet was then over-drilled using 12 -inch OD HSAs. The upper 3 feet was
<br />then grouted and completed to grade with cement bentonite grout.
<br />Investigative Derived Waste
<br />Soil cuttings and rinsate water generated during these activities was temporarily
<br />stored onsite in labeled 55 gallon drums pending characterization and disposal. On
<br />April 2, 2009, soil cuttings and rinsate water were removed from the site. Soil cuttings
<br />were properly disposed of at the Republic Services Vasco Road Landfill in
<br />Livermore, California. Rinsate water was disposed of at Chemical Waste
<br />Mr. James L.L. Barton,
<br />P.G.
<br />May 11, 2009
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