ARCHIVED REPORTS_XR0008184 - Laserfiche WebLink

Home Browse Search

' 25 April 2005 • AGE-NC Project No 95-0128 Page 2 of 8 ' The extracted ground water was routed through a ground water treatment system consisting of granular activated carbon(GAC) Following treatment,water was discharged underground via 1-Inch diameter, Schedule 80 polyvinylchloride (PVC) pipe along the west side of the site to the City of Stockton discharge line located in Rose Marie Lane In December 2005,the ground water discharge permit was amended to allow for a ground water flow equal to 10 GPM A diagram of the remediation system is provided on Figure 2a Based on effluent flow meter readings (total gallons Table 1), approximately 663,858 gallons of treated water were extracted and discharged to the City of Stockton sewer system during the first quarter of 2005 under City of Stockton Public Works Department (SPWD) Industrial Wastewater Discharge Permit No 01 2 12 Ground Water Extraction System Water Sampling Procedures Between December 2004 and March 2005,AGE collected water samples from valved ports located upstream (influent) and downstream (effluent) of the treatment unit The Influent samples were • collected in laboratory-supplied 40-milliliter (ml) EPA-approved volatile organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid as a sample preservative, and I-liter amber bottles without preservative Care was taken to ensure that visible air bubbles were not present in the vials after filling and capping Water sample containers were labeled with the sample designation,date,time,and sampler's initials Subsequently,the samples were logged on a chain of custody form,placed in a chilled container and transported to Cal Tech Environmental Laboratories (CTEL) a State of California Department of Health (DHS)-certified analytical laboratory The samples were analyzed for • Total petroleum hydrocarbons quantified as gasoline and as diesel (TPH-g and TPH-d) by EPA Method 8015 Modified, and ra Benzene, toluene, ethylbenzene and xylenes (BTEX) and the fuel additive methyl tertiary- butyl ether(MTBE) in accordance with EPA Method 8020 or 8260B • In addition, to satisfy SPWD Industrial Wastewater Discharge Permit No 01, the effluent water samples were analyzed for pH (150 1) 22 SOIL-VAPOR EXTRACTION SYSTEM OPERATION AND MONITORING The SVE unit consists of four (4) 300 lbs granular activated carbon(GAC) vessels for adsorption and a 200 cubic foot per minute (CFM) SVE extraction positive displacement (PD) lobe blower Advanced GeoEnvironmentai,Inc