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Glen <br /> T1 <br /> art <br /> FUGRO WEST, INC �p '! <; 00 <br /> - 4 <br /> February 23, 1995 1050 Me"Lane suite 160 <br /> Project No 9347-3011 j <br /> Roseville,California <br /> 916)782 2610 <br /> FAX (916)786-7830 <br /> Mr Lynn Walker <br /> Shell Oil Company <br /> Post Office Box 4023 <br /> Concord, California 94524 <br /> Subject Groundwater Monitoring and Remediation Status Report <br /> Fourth Quarter 1994 <br /> Former Shell Service Station (WIC No 204-7524-1509) <br /> 141 N El Dorado, Stockton, California <br /> Dear Mr Walker <br /> Fugro West, Inc (Fugro), is pleased to provide Shell Oil Company the attached information <br /> documenting the results of quarterly groundwater monitoring, conducted on November 14, 1994, <br /> at the subject site by Blaine Tech Services, Inc , of San Jose, California (Attachment 1) Also <br /> attached are results of soil venting system sampling (Attachment 2), groundwater pumping/ sewer <br /> discharge sampling (Attachment 3), and groundwater oxygenation (GO) system monitoring for <br /> dissolved oxygen (Attachment 4) <br /> Site remediation systems, consisting of groundwater recovery with discharge to sewer, GO, and <br /> soil venting with granular activated carbon (GAC) emissions control, are currently in operation <br /> Soil Vent System Operation <br /> The venting system operation (extraction from VEW-1, VEW-2, VEW-3, and VEW-4) <br /> commenced on June 23, 1993 Vapor extraction from monitoring well MW-3 commenced on <br /> July 8, 1994 Fugro has performed soil vent system monitoring according to the air permits <br /> (Permit to Operate No N-1133-2-0 and Authority to Construct Permit No N-1133-2-1) issued <br /> by the San Joaquin Valley Unified Air Pollution Control District System monitoring results and <br /> calculations are included as Attachment 2 Between October 4, and December 30, 1994, an <br /> estimated 48 pounds of TPH, as gasoline, were extracted from subsurface vapors, based on <br /> laboratory analytical results During the period between June 23, 1993 and December 30, 1994, <br /> cumulative TPH (as gasoline) extraction from subsurface vapors is estimated at 1,580 pounds, <br /> based on laboratory analytical results System monitoring information, including airflow, <br /> hydrocarbon concentrations, and extraction rates, is included in Attachment 2 <br /> 93473011 EQR A member of the Fugro group of companies with offices throughout the world <br />