Laserfiche WebLink
} <br /> t <br /> Mr Lynn Walker <br /> May 24, 1995 (9347-3011) <br /> SOIL VENT SYSTEM OPERA'T'ION - ATTACHMENT B <br /> Aegis Environmental, Inc (now Fugro) restarted soil venting system operation (extraction <br /> from VEW-1, VEW-2, VEW-3, and VEW-4) on June 23, 1993 Vapor extraction from <br /> monitoring well MW-3 commenced on July 8, 1994 Fugro has performed soil vent system <br /> monitoring according to the air permits (Permit to Operate No N-1133-2-0 and Authority to <br /> Construct Permit No N-t 133-2-1) issued by the San Joaquin Valley Unified Air Pollution <br /> Control District Attachment B includes system sampling/monitoring results and laboratory <br /> reports <br /> Hydrocarbon Extraction Rates and Cumulative Extraction Estimate <br /> Between December 30, 1994, and March 9, 1995, the TPH extraction rates have ranged <br /> from 0 4 to 0 8 lbs/day and an estimated 36 pounds of TPH, as gasoline, were extracted from the <br /> subsurface, based on laboratory analytical results During the period between June 23, 1993 and <br /> March 9, 1995, cumulative TPH (as gasoline) extraction from subsurface vapors is estimated at <br /> 1,616 pounds, based on laboratory analytical results <br /> GROUND WATER PUMPING WITH DISCHARGE TO SANITARY SEWER - <br /> ATTACHMENT C <br /> The ground water recovery system operation (pumping approximately 3 to 5 gallons-per- <br /> minute each from wells RW-1 and RW-2) commenced on March 2, 1993 Pumping from RW-1 <br /> was shut down on September 20, 1994, because the ground water samples from the well did not <br /> contain any detectable hydrocarbons during the previous quarterly sampling event <br /> (August 16, 1994) <br /> Quarterly sewer discharge sampling and reporting has been performed according to the <br /> discharge permit issued by the City of Stockton Municipal Utilities Department Attachment C <br /> is the first quarter 1995 sewer discharge report The report includes 1) pumping rates, 2) total <br /> discharge to sewer, and 3) laboratory sampling results since system startup <br /> Sewer Discharge Parameteis <br /> During the period between March 2, 1993 and March 22, 1995, an estimated 5,458,182 <br /> gallons of ground water containing dissolved hydrocarbons were pumped from RW-1 and RW-2 <br /> and discharged into the sewer To date, the Total Petroleum Hydrocarbon concentrations in the <br /> discharge water have ranged from less than 0 05 to l 5 parts per million (ppm), benzene <br /> concentrations have ranged from less than 0 0005 to 0 026 ppm <br /> 93471011 BSR - 2 - <br />