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STATE OF CALIFORNIA-Environmental Protection&V 1-6 <br /> PETE WILSON Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION <br /> 3443 Routier Road,Suite A <br /> Sacramento, )2 5-3003098 RECEIVED <br /> PHONE:()255 255-301N1 ohevmn Pipe Line Co. <br /> FAX:(976)255-3015 <br /> n 6 1996 <br /> 31 October 1996 K.L.H. <br /> Ms. Katie Hower <br /> Chevron Pipe Line Company <br /> P.O. Box 5059 <br /> San Ramon, CA 94583-0959 <br /> CHEVRON PIPE LINE COMPANY'S ALDEN PARK CONTAMINATION SITE, <br /> TRACY, SAN JOAQUIN COUNTY <br /> I have reviewed the 24 September 1996 Soil and Groundwater Characterization Report prepared <br /> by Geomatrix for the Chevron Pipe Line Company Alden Park site in Tracy. The report describes <br /> the conditions at the site which include soil contamination to at least 15 feet below the ground <br /> surface. The contamination consists of heavy, crude oil petroleum product. Separate phase <br /> product is found on the groundwater table in the center of the site, but dissolved constituents have <br /> not been detected in wells only 100 feet outside the free product plume. <br /> Geomatrix has concluded that the soil contamination and free product is not serving as a source <br /> of groundwater contamination. The groundwater data presented in the report include a sampling <br /> event in April 1996 from 12 monitoring wells with analyses for benzene, toluene, ethylbenzene <br /> and xylenes (BTEX) and polynuclear aromatic hydrocarbons (PAHs). Groundwater also was <br /> sampled sporadically from 1987 to 1994 for BTEX, PAI-Is and oil and grease. <br /> Although the crude oil may not be a source for groundwater contamination, additional sampling <br /> is needed to confirm this. The attached draft monitoring and reporting program (MRP) is for your <br /> review and comment. By 22 November 1996, please provide your comments on the draft MRP. <br /> If you have any questions, you may call me at(916) 255-3077. <br /> W <br /> J L M. WEISS <br /> ngineering Geologist <br /> Attachments <br /> JMW:jmw/Isb <br /> cc: San Joaquin County Department of Public Health Services, Stockton <br />