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Ci <br /> SEC0R <br /> 7-Eleven Store#19976 <br /> Quarterly Groundwater Monitoring and Remediation Progress Report(4Q2004) <br /> February 15, 2005 <br /> h' <br /> Page 6 <br /> r <br /> , l <br /> concentration increase was observed in MW-2, located adjacent to SP-1 and SP-1A, which J ; Ff <br /> showed an increase from 0 5 milligram per liter (mg/L) to 20 6 mg/L.on December 20, 2004 <br /> SECOR will continue biweekly to monthly oxygen infection during the first quarter 2005 <br /> Copies of the field notes and laboratory analysis are presented in Attachment C <br /> f3 � <br /> On November 23, 2004 a 5 hour SVE event was conducted on well MW-2 Based on soil <br /> vapor samples collected during the test, it is estimated that 1 79 pounds of TPHg was <br /> removed No recordable amount of benzene or MtBE was removed during this test (Table <br /> 6) Based on the results of the SVE test, SECOR recommends periodic SVE from MW-2 '� <br /> during 2005 Copies of SVE field notes and laboratory analyses are presented in , ` <br /> Attachment D <br /> PURGE AND RINSATE WATER DISPOSAL <br /> Water generated during well sampling and equipment cleaning is pumped into a SECOR <br /> truck-mounted water tank The water is transferred into properly labeled 55-gallon drums <br /> and stored on-site The drummed non-hazardous petroleum hydrocarbon contaminated <br /> water is transported quarterly by Belshire Environmental to DeMenno Kerdoon in Compton, <br /> California, for disposal if <br /> ATTACHMENTS a , s <br /> Figures <br /> Tables <br /> Attachment A— Monitoring and Sampling Field Notes <br /> Attachment B —Certified Laboratory Analytical Reports and Chain-of-Custody Documentation } <br /> Attachment C—Oxygen Infection Field Notes <br /> Attachment D —SVE Field Notes and Laboratory Analytical Reports and Chain-of-Custody <br /> Documentation <br /> n <br /> cc Ms Vicki McCartney, San Joaquin County, Environmental Health Department <br /> Mr James Barton, Regional Water Quality Control Board, Central Valley Region <br /> 3 <br /> iN <br /> t <br /> �1 <br /> i} <br /> ay <br /> K <br /> F;A.6f <br /> • t1�� <br /> 19976 04-40 Report doc SECOR International Incorporated <br /> , <br />