ARCHIVED REPORTS XR0000566 - Laserfiche WebLink

Home Browse Search

Chevron Groundwater Monitoring Report(3Q2002) Page 2 of 2 Facility: #9-0557—139 South Center Street,Stockton,CA Date: September 27,2002 DISCUSSION: Groundwater monitoring and sampling was performed by Gettler-Ryan Inc. on July 151h,2002. Fifteen wells were sampled during this event. TPHg was detected in samples collected from five of the fifteen wells at concentrations ranging from 66 µg/1 in the sample collected from MW-2 to 160,000 µgll in the sample collected from MW-9A. TPHd was detected in samples collected from eight of the wells at concentrations ranging from 110 µg/I(MW-6)to 78,000 µg11 (MW-9S).`TPI-Imo was detected in samples collected from three wells at concentrations ranging from ` 2,300 Vg/1 (MW-9)to 4,300 pg/l (MW-9A).�Benzene was detected in samples collected from four of the wells at concentrations ranging from 60 µg/l in the sample collected from MW-7 to 15,000µg/1 in the sample collected from MW-9A. MtBE was not detected in any of the samples collected during this event. TBA was detected in the samples collected from MW-9A and MW-9S at concentrations of 290 µg/1 and 370µg/l,respectively. 1, 2-DCA and EDB were detected in the sample collected from MW-9S at concentrations of 590 µg/1 and 220 µg11, respectively. Depth to water in the monitoring wells across the site increased an average of approximately 0.95 feet from the previous quarter. Groundwater flow was variable,but generally to the southeast, at gradients ranging from 0.005 to 0.01 f#/ft,consistent with historical data. LIMITATIONS: The findings presented in this letter are based on data and interpretations provided by Gettler-Ryan, Inc. Gettler- Ryan's report is attached. The data presented in this summary is accurate only to the degree implied by the sources and methods used. No warranty, expressed or implied, is made by SECOR. . If you have any questions,please feel free to call us at(916)861-0400. Sincerely, SECOR International Inc. William E. Brasher, P.E. Project Manager ATTACHMENTS: • Attachment A—August 26,2002 Groundwater Monitoring& Sampling Report by Gettler-Ryan Inc. cc: Bob Cochran, Chevron Products Company, P.O. Box 6004, San Ramon,CA 94583-0804 Marty Hartzell,RWQCB—CVR,3443 Routier Road, Suite A, Sacramento, CA 95827 Greyhound Lines, P.O. Box 660362,Dallas TX 75266-0362