ARCHIVED REPORTS_XR0006719 - Laserfiche WebLink

Home Browse Search

Y) l Canepa s Car Wash 6230 Pamfic Avenue,Stockton,CA First Quarter Groundwater Monitonng Report,January 2005 Page 5 of S • TREATMENT SYSTEM STATUS UPDATE Sampling of the Soil Vapor Extraction (SVE) system was suspended during the first quarter of 2004 and shut down on January 31, 2004, to allow for modifications to the system and property development In a letter dated October 17, 2003, the SJCEHD approved the Remedial Action Plan (RAP) submitted by Condor, dated March 3, 2003, for upgrade of the SVE system and installation of a groundwater pump and treat system to operate in tandem with the upgraded SVE system Installation of the pump and treat system and upgraded SVE system was completed in September 2004 The groundwater pump and treat and upgraded SVE system was constructed such that petroleum hydrocarbons that are removed from the liquid phase treatment stream are fed as a vapor phase into the catalytic oxidizer as part of the total vapor phase influent Groundwater from MW-I and/or MW-1 I is pumped into the SVE liquid/vapor separator Accumulated liquid is pumped to the air-stnpper storage tank and through a heat-exchanger that is integrated into the SVE effluent stack prior to entering the air- stripper The air-stnpper removes BTEX and MTBE constituents with a removal efficiency of approximately 99% and 32%, respectively Liquid phase effluent from the air-stripper is pumped through two tanks, plumbed in series and loaded with 1000# of coconut-derived virgin activated carbon The carbon tanks are intended to adsorb residual MTBE, TBA, and other oxygenates Treated water is discharged to the sanitary sewer Vapor phase influent is drawn from the 9-well array through the liquid/vapor separator, and then into the catalytic oxidizer The catalytic oxidizer is operationally controlled to maintain temperature at 600-700 degrees F with a vapor flow rate of 100-300 SCFM The destructive efficiency of the catalytic oxidizer ranges from 95% to 99% Operational and efficiency data are included in Attachment D Laboratory certificates of analyses and chain-of-custody records are • included in Attachment F Initial inspection of the SVE system was conducted on September 30, 2004, and a follow-up inspection was conducted on October 7, 2004 In a letter report, Soil Vapor Extraction System, submitted to Karen DeGroot of the San Joaquin Valley Air Pollution Control District(SJVAPCD), dated November 30, 2004, Condor provided data required in the SJVAPCD Authority to Construct document to obtain a SJCAPCD Permit to Operate The City of Stockton Municipal Utilities District (MUD) authorized the initiation of discharge of treated groundwater on October 2$, 2004 Groundwater extraction and treatment, with subsequent discharge to the sanitary sewer began November 1, 2004 Monthly sampling and reporting of the final discharge of treated groundwater is required in the MUD groundwater discharge permit Those reports document the analytical results of the treated groundwater being discharged into the City of Stockton sanitary sewer system The laboratory analytical data for final discharge samples collected during October, November, and December 2004, and January 2005 indicated that none of the contaminants of concern were detected at or above the laboratory reported detection limits The laboratory analytical data for the final discharge sample collected on February 16, 2005 indicated that none of the contaminants of concern were detected at or above the lahnratnry rPnnrtPrl d�tPrhnn limitg event fnr X4 RP xxThin1k ;xiao :1_f__+_A 't I r Y evve .. �. concentration of 120 µg/l This concentration of MTBE exceeded the discharge limit set forth in the MUD groundwater discharge permit, and the system was shut down Corrective action is being undertaken The anticipated restart date is April 6, 2005 MASS REMOVAL AND DESTRUCTION CALCULATIONS The system was operational 1,430 hours between November I, 2004 and March 1, 2005, or 50% of the • time The groundwater treatment system has removed petroleum hydrocarbons from 299,216 gallons of groundwater during the dates and hours of operation indicated above Groundwater treatment system �1� CONDOR