Laserfiche WebLink
SECOR www secor com <br /> }y INTERNATIONAL 3017 Kilgore Road suite 100 <br /> S E C ® Rancho Cordova CA 95670 <br /> INCORPORATED 916-061-0400 TFL <br /> 916-861-0430 FAx <br /> • 4� <br /> November 2, 2004 <br /> mnoE E � <br /> Ms Vicki McCartney NOV 0 4 2004 <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor Z VAEALTH <br /> Stockton, CA 95202 ENVIRONMENT CES <br /> RE Quarterly Groundwater Monitoring Report--Third Quarter 2004 <br /> 76 (Former BP) Service Station No 11193 <br /> 3202 West Hammer Lane <br /> Stockton, California <br /> SECOR Project Nos 77CP 60193 01 0001/77BP 50193 02 0436 <br /> Dear Ms McCartney <br /> 1 <br /> SECOR International Incorporated (SECOR) is providing this report to summarize the third quarter, <br /> 2004 groundwater monitoring event at the above-referenced site <br /> COMPLETED ACTIVITIES —Third Quarter 2004 <br /> o Performed groundwater monitoring and sampling of wells on August 24, 2004 <br /> • Prepared and submitted second quarter 2004 groundwater monitoring report <br /> • Completed cone penetrometer testing (CPT)vertical assessment of subsurface impacts <br /> • Submitted CPT vertical site assessment report <br /> • Performed routine operation and maintenance of ozone sparge (OS) system <br /> PLANNED ACTIVITIES — Fourth Quarter 2004 <br /> • Perform quarterly groundwater monitoring and sampling <br /> • Prepare and submit third quarter 2004 groundwater monitoring report <br /> • Perform routine operation and maintenance of the OS system <br /> • Upon securing the appropriate well permits, perform additional off-site assessment for lateral <br /> delineation of petroleum hydrocarbons and fuel oxygenate impacts <br /> DISCUSSION <br /> k <br /> On August 24, 2004, SECOR measured depth to groundwater and collected groundwater samples <br /> from eleven wells (MW-IR, MW-2R, MW-3 through MW-10, and VW-1) — Depth to water <br /> measurements from the August 24 water level gauging event, and calculated groundwater elevation ` <br /> data are included in Table 1 Groundwater elevation data from the August 24, 2004 gauging event <br /> were used to construct a potentiometric surface map, which is included as Figure 1 During the third <br /> quarter 2004, the direction of groundwater flow was east-northeast at a hydraulic gradient of 0 001 <br /> feet per foot (ft/ft) Historical groundwater gradient data are presented in Table 2 Groundwater ; <br /> elevations decreased by an average of 0 86 feet (ft) from the previous quarter SECOR's field <br /> procedures for groundwater sampling and equipment decontamination are included in Attachment i <br /> Groundwater sampling field data sheets showing recorded depth to groundwater levels are included <br /> in Attachment 2 <br /> 11ConocoPhilhps\Tosco Marketing1111931QMR13QMRG4 Final doc <br /> T � <br /> — i <br />