ARCHIVED REPORTS XR0007488 - Laserfiche WebLink

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�rsRO Mr Lynn Walker August 11, 1995 (9347-3011) Soil Vent System Operation Aegis Environmental,Inc (now Fugro) restarted soil venting system operation (extraction from VEW-1, VEW-2, VEW-3, and VEW-4) on June 23, 1993, while vapor extraction from monitoring well MW-3 commenced on July 8, 1994 Fugro has performed soil vent system monitoring in accordance with the requirements of the permits (Permit to Operate No N-1133-2-0 and At thonty to Construct Permit No N-1133-2-1) issued by the San Joaquin Valley Unified Air Pollution Ck)ntrol Distnct The soil venting system has been "pulsed," i e cycled on and off, at approximately two week intervals from February 23, 1995 to the present Pulsing is intended to increase the efficiency and amount of petroleum hydrocarbons extracted by optimizing soil vapor recovery Attachment B includes system sampling/monitoring results and laboratory reports Hydmcairbon Extraction Rates and Cumulative Exduction Estimate r � Between March 9 and July 3, 1995, the TPH extraction rates have ranged from 0 4 to 0 7 lbs/-day and an estimated 32 pounds of TPH-g extracted from the subsurface During the period between June 23, 1993 and July 3, 1995, cumulative TPH-g extraction from subsurface vapors is estimated at 1,648 pounds (264 gallons) Petroleum hydrocarbons extraction rates and cumulative volume of petroleum hydrocarbons removed calculations are included in Attachment • B Gmund Wates Pumping With Discharge to Sanitary Sewer Ground water recovery system operation (pumping approximately 3 to 5 gallons-per- minute each from wells RW-1 and RW-2) commenced on March 2, 1993 Pumping from RW-1 was discontinued on September 20, 1994, since no petroleum hydrocarbons were detected in the ground water samples collected from the well RW-1 during the previous three quarterly sampling events (August 16, November 14, 1994 and February 22, 1995) Quarterly sewer dischArge *Mpling and repiorung has been performed in accordance to thetregaiirements of the• discharge per" tss 1 bythe City of Stockton Municipal Utilities De tmtn Attachment C is the second`quarter`"l9l" sewer discharge repfl wlttch includes' m ,, Win} i g-rafk; 2) total discharge tw sewer, aim 3) analytical results single system startup Parameters f - ' ,Y. During the period between March 2, 1993 and June 20, 1995, an estimated 5,772,087 gal'lo`ns of ground water containing dissolved phase petroleum hydrocarbons were'temaved from RW-1 and RW_2 and discharged into the sewer To date, the TPH-g cortcentratioXm detected in the discharge water have ranged from less than 0 05 to 1 5 ppm, benzene concentrations have ranged from less thy' 0 0005 to 0 026 ppm An mumated 35 pounds of TPH wwq recovered by the ground water recovery system (between Marti 2, 1993 and June 20, 1995) 93473012 CSR - -