ARCHIVED REPORTS XR0007504 - Laserfiche WebLink

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r L ww G,ound� for Monnor4g and Romodmuon Statue Rapart N Q� Second quarter 1994 141 N EI Dorado Stoddon Cahfamia A separate electric meter to track remediation system utility costs was installed I Site remediation systems, consisting of groundwater recovery with discharge to sewer, GO, and soil venting with granular activated carbon (GAC) emissions control, are currently in operation Soil Vent System Operation The venting system operation (extraction from VEW-1 , VEW-2, VEW-3, and VEW-4) commenced on June 23, 1993 Vapor extraction from monitoring well MW-3 commenced on July 8, 1994 Fugro has performed soil vent system monitoring according to the air permit (Permit to Operate No N-1133-2-0 and Authority to Construct Permit No N-1133-2-1) issued by the San Joaquin Valley Unified Air Pollution Control District System monitoring results and calculations are included as Attachment 2 Between April 5 and June 1 , 1994, an estimated 159 pounds of TPH (as gasoline) were extracted based on laboratory analytical results During the period between June 23, 1993 and June 1 , 1994, cumulative TPH (as gasoline) extraction from the soil is estimated at 1 ,406 pounds based on laboratory analytical results System monitoring information including airflow, hydrocarbon concentrations, and extraction rates is included in Attachment 2 Groundwater Pumping With Discharge to Sanitary Sewer The groundwater recovery system operation (pumping from wells RW-1 and RW-2) commenced on March 2, 1993 Quarterly sewer discharge sampling and reporting has been performed according to the discharge permit issued by the City of Stockton Municipal Utilities Department Sewer discharge results since system startup in March 1993 and a copy of the most recent quarterly sewer discharge report are included as Attachment 3 During the period between March 2, 1993 and July 7, 1994, an estimated 4,476,793 gallons of ground water containing dissolved hydrocarbons were pumped from RW-1 and RW-2 and discharged into the sewer Total Petroleum Hydrocarbon concentrations ranged from less than 0 05 to 1 5 parts per million (ppm), benzene concentrations ranged from 0 0024 to 0 023 ppm System monitoring information including pumping rates, hydrocarbon concentrations, and discharge to the sanitary sewer is included in Attachment 3 Groundwater Oxygenation_System Startup Operation of the GO system commenced on July 11, 1994 with air diffusers in operation in wells MW-1 MW-2, and MW-3 Results of GO system startup are presented as Attachment 4 After evaluating system data, the air diffusers in wells MW-4, RW-1 , and RW-2 are expected to be activated Remediation system operation and monitoring will be continued per regulatory requirements 93473011 ASR 2