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PUBLIt HEALTH SERVICES �O•.p�'u�~•.C� <br /> SAN JOAQUIN COUNTY <br /> JOGI KHANNA INI.D..M.P.H. y' < <br /> Health Officer 'P <br /> c4��.....•rig <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) •Stockton, California 95201 F o a <br /> (209) 468-3400 <br /> CLINT ROGERS <br /> EVRON USA <br /> PHO BOX 5004QFC 2 7 1991 <br /> SAN RAMON CA 94583-0804 <br /> C(a P)f <br /> RE: Chevron SS#9-4275 IN REPLY REFER TO SITE CODE: 1952 <br /> 2905 W. Benjamin Holt <br /> Stockton, CA <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/EHD) has reviewed the report dated August 30, 1991 <br /> prepared by Alton Geoscience for the above site. A quarterly <br /> report dated November 18, 1991 prepared by Brown and Caldwell for <br /> the ARCO station located at 2908 W. Benjamin Holt has also been <br /> reviewed. In a phone conversation on December 6, 1991, Margaret <br /> Lagorio, Senior REHS, PHS/EHD, discussed with you concerns that <br /> additional monitoring wells previously proposed in June 1990 for <br /> this site have never been installed. The plume of groundwater <br /> contamination has never been physically defined and a remediation <br /> plan has not been developed. <br /> In June 1991 ARCO started extracting over 400, 000 gallons of <br /> groundwater per month at their site. This groundwater extraction <br /> has influenced the groundwater flow pattern according to ARCO'S <br /> last quarterly report. ARCO installed a monitoring well (BHD-1) <br /> forty (40) feet from Chevron's Monitoring Well #1. ARCO' S last <br /> quarterly report indicates BHD-1 had a decrease in water level of <br /> 2 . 01 feet between April 1991 and July 1991 and the amount of <br /> contamination detected in BHD-1 increased during that period. <br /> According to Chevron' s last quarterly report groundwater samples <br /> from Monitoring Well #1 had benzene concentration of 3300 parts per <br /> billion (ppb) . Chevron should be aggressively pursing the <br /> investigation and remediation of the contamination at this site. <br /> PHS/EHD requested Central Valley Regional Water Quality Control <br /> Board (CVRWQCB) schedule a meeting with ARCO, Chevron, PHS/EHD, and <br /> CVRWQCB staff in attendance to discuss the investigation and <br /> remediation of these sites. Cooperation between Chevron and ARCO <br /> is essential in the clean-up of these sites. The meeting has been <br /> scheduled for January 28, 1992 at 10: 00 a.m. at the CVRWQCB office <br /> located at 3443 Routier Road, Sacramento. <br /> A work plan for the additional monitoring wells should be submitted <br /> by February 15, 1992 or the work outlined in the June 1990 work <br /> plan completed by that date. <br /> A Division of San Joaquin County Health Care Services <br /> f <br />