Laserfiche WebLink
} �fSECOR www secor com <br /> INTERNATIONAL <br /> S E C 0 R <br /> INCORPORATED 3437 Empresa Drive Suite A <br /> San Luis Obispo CA 93401 <br /> • 805-546 0455 TEL <br /> 805-548-0583 FAx <br /> January 27, 2006 <br /> Mr Jeffrey Wong <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor 111"111 <br /> Stockton, CA 95202 <br /> JAN 2 6 2006 <br /> RE Fourth Quarter 2005 Groundwater Monitoring Report ENVIRONMENT HEALTH <br /> Chevron Branded Service Station 9-9840 PERMIT/SERVICES <br /> 4344 Waterloo Road <br /> Stockton, California <br /> SECOR Project No MTCH 99840 06 X154 <br /> Dear Mr Wong <br /> SECOR International Incorporated (SECOR), on behalf of Chevron Environmental Management <br /> Company (CEMC), has provided this report to summarize the fourth quarter 2005 (4Q2005) groundwater <br /> monitoring event at the above-referenced site <br /> COMPLETED ACTIVITIES — FOURTH QUARTER 2005 <br /> . ■ Conducted quarterly groundwater monitoring and sampling, and, <br /> ■ Prepared and submitted quarterly groundwater monitoring report <br /> PLANNED ACTIVITIES — FIRST QUARTER 2006 <br /> ■ Conduct quarterly groundwater monitoring and sampling, and, <br /> ■ Prepare and submit quarterly groundwater monitoring report <br /> DISCUSSION <br /> On October 27, 2005, Gettler-Ryan Incorporated (G-R) performed 4Q2005 groundwater monitoring and <br /> sampling G-R's groundwater monitoring report is included in Attachment A Groundwater elevations <br /> across the site ranged from 38 41 to 39 03 feet below mean sea level (msl) Groundwater elevation <br /> across the site decreased an average of 2 75 feet from the previous sampling event Groundwater flow <br /> was northeasterly at an approximate gradient of 0 002 to 0 003 ft/ft Seven wells were sampled during <br /> this event Toluene was detected in the QA sample at a concentration of 0 5 micrograms per liter (dig/L) <br /> Toluene was not detected in groundwater samples collected from monitoring wells An investigation of <br /> the anomalous detection is being conducted A summary of laboratory analytical data including total <br /> petroleum hydrocarbons as gasoline (TPHg), benzene, and methyl tertiary butyl ether (MtBE) is <br /> presented below <br /> • <br /> 4Q05MR 99840 SECOR International Incorporated <br />