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r • <br /> California Regional Water Quality Control Board <br /> Central Valley Region V: <br /> Robert Schneider,Chair W/nV.:+r� __ Arnold <br /> Alan C.Lloyd,Ph.D. U UISg9J overnor <br /> ���,,ITl� Schwarcenegger <br /> Secretaryfor Fresno Branch Office VJ <br /> Environmental 1685 E Street,Fresno,Califomia 93706 G <br /> Protection (559)445-5116•Fax(559)445-5910 JAN 0 3 7005 <br /> http://www.wataboards.ca.gov/centralvalley <br /> '"OW`1QACdltiN Cpt ftV Ty <br /> ki WALM DFp,. <br /> 29 December 2004 <br /> M. Scott Mansholt <br /> ChevronTexaco <br /> Chevron Environmental Management Company <br /> °' <br /> Property Management �O <br /> 6001 Bollinger Canyon Road <br /> P. O. Box 6012 <br /> San Ramon, CA 94583-0712 <br /> SECOND SEMIANNUAL 2004 (JULY—DECEMBER), GROUNDWATER MONITORING <br /> AND THIRD QUARTER PRODUCT REMOVAL REPORT, ALDEN PARK, TRACY, SAN <br /> JOAQUIN COUNTY <br /> We have reviewed the Second Semiannual 2004 Groundwater Monitoring Report(July-December) and <br /> Third Quarter Product Removal Report, Alden Park, Tracy, San Joaquin County(report), dated 23 <br /> November 2004, prepared for Chevron Environmental Management Company by Science Applications <br /> International Corporation(SAIL). The monitoring was conducted in accordance with Monitoring and <br /> Reporting Program R5-2003-0801. The report provides the 5 and 6 August 2004 groundwater <br /> monitoring analytical results for the site now occupied by Alden Park in Tracy, CA. <br /> There are 21 monitoring wells associated with this project; eleven of the wells were purged and sampled, <br /> nine contained free product, and one well (MW-2) was dry. Concentrations of total petroleum <br /> hydrocarbons as diesel (TPH-d)were not detected (ND) in six wells and ranged from 59 gg/L to 520 <br /> gg/L(w/o silica gel cleanup) for the five wells having detectable TPH-d concentrations. <br /> According to the report, during this sampling event, petroleum hydrocarbons were reported in three <br /> wells that have never reported detectable petroleum concentrations or they have not been reported for <br /> sometime. This event reported TPH-d at 59, 210, and 190 µg/L,respectively in MW-l/KJC, MW-8, <br /> and MW-11. Previously,MW-1/KJC reported 75 gg/L TPH-d in October 2000 and ND in 2003 and <br /> 2004. MW-8 has only been sampled two times previously(August 2003 and February 2004) and results <br /> were ND. In MW-11, TPH-d at 400 and 230 µg/L, respectively, was reported in 2000 (July and <br /> October). Review of the data indicates that for unknown reasons there were periods of time when <br /> MW-l/KJC and MW-1 1 and several other wells were not sampled (1997 through 1999 and 2001 <br /> through early 2003). <br /> California Environmental Protection Agency <br /> n Reeccled Paper <br />