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California Regional Water Quality Control Board` <br />Central Valley Region tb <br />Karl E. Lon ley ScD P.E. Chair <br />Linda S. Adams. Arnold Schwarzenegger <br />��r,r,�.r,t���.t. �,��. Sacramento Main Office Governor <br />17111-0111? It, �� Internet Address hop uw�cu_waterhoards.ca.gov/centralvalle} <br />Protection 11020 Sun Cenler Drive 0200 Rancho Cordova. CA 9567461 14 _ <br />I'honc (9 1 61 4 64-329 1 Fax (916) 464-4797 Lit EE Vi <br />E� DO <br />25 July 2007 ��1, , <br />JI.iL >.; � 2007 <br />Mr. Nathan Crum ENViRONIVIENT HEALTH <br />Valley Pacific Petroleum Services, Inc. PERMIT/SERVICES <br />166 Frank West Circle <br />Stockton, CA 95206 <br />SEMI-ANNUAL AND ANNUAL GROUNDWATER MONITORING REPORTS, VALLEY <br />PACIFIC SERVICES, INC., 930 VICTOR ROAD, LODI, SAN JOAQUIN COUNTY <br />Regional Water Quality Control Board - Central Valley Region (Regional Water Board) staff <br />reviewed three reports submitted by Ground Zero Analysis, Inc. (GZA) on behalf of Valley <br />Pacific Petroleum Services, Inc. (Valley Pacific) for the service station site (Site) at 930 Victor <br />Road in Lodi. Petroleum is stored at the Site in both underground and above ground storage <br />tanks. Valley Pacific performs groundwater monitoring pursuant to Monitoring and Reporting <br />Program (MRP) No. R5-2002-0827. <br />The reports reviewed are listed below: <br />• 23 January 2007 Semi -Annual Groundwater Monitoring and Sampling Report, Third <br />and Fourth Quarters 2006 (First Semi -Annual Report) <br />• 8 February 2007 Annual Groundwater Monitoring and Sampling Report 2006 (Annual <br />Report) <br />• 15 May 2007 Semi -Annual Groundwater Monitoring and Sampling Report. First and <br />Second Quarters 2007 (Second Semi -Annual Report) <br />In the First Semi -Annual Report, GZA describes groundwater monitoring and sampling <br />activities performed in July 2006 for the third quarter. Valley Pacific conducted no monitoring <br />activities during October 2006 for the fourth quarter due to an injury to the GZA technician. In <br />the Annual Report, GZA summarizes groundwater monitoring and sampling activities <br />performed for the first, second, and third quarters of 2006. <br />During 2006, GZA observed that depth to groundwater (DTW) ranged from about 56 feet <br />below ground surface (bgs) during the first quarter to about 51 feet bgs during the third <br />quarter. Groundwater flow during the year was toward the southwest and southeast at <br />gradients ranging from about 0.006 feet per foot (ft/ft) to 0.025 ft/ft. The DTW observations <br />and gradient calculations are consistent with historical observations. <br />GZA conducted groundwater sampling in all wells during 2006, including MW -8 and MW -9R <br />when separate phase hydrocarbon (SPH) was absent from these wells. The maximum product <br />California Environmental Protection Agency <br />�a Rcci cled Paper <br />