Laserfiche WebLink
California Regional Water Quality Control Board <br /> Central Valley Region <br /> o x <br /> Karl E.Longley,ScD,P.E.,Chair <br /> Linda S.Adams 11020 Sun Center Drive#200,Rancho Cordova,California 956746114 Arnold <br /> Secretaryfor h <br /> c <br /> Swarzene <br /> Environmental Phone(916)464-3291 •FAX(916)464-4645 gger <br /> http://www.waterboards.ca.gov/centralvalley Governor <br /> Protection <br /> 15June 2009 <br /> JUN 1 8 2009 <br /> Mr. Nathan Crum ENViROM'�1ENr HEALTH <br /> Valley Pacific Petroleum Services, IneERWT/SERVii,ES <br /> 166 Frank West Circle <br /> Stockton, CA 95206 <br /> SEMI-ANNUAL GROUNDWATER MONITORING AND SAMPLING REPORT, FIRST AND <br /> SECOND QUARTERS 2009, VALLEY PACIFIC PETROLEUM SERVICES, <br /> 930 VICTOR ROAD, LODI, SAN JOAQUIN COUNTY <br /> Regional Water Quality Control Board, Central Valley Region (Central Valley Water Board) <br /> staff reviewed the 13 May 2009 Semi-Annual Groundwater Monitoring and Sampling Report, <br /> First and Second Quarters 2009 (Semi-Annual Report) submitted by Ground Zero Analysis, <br /> Inc. (GZA) on behalf of Valley Pacific Petroleum Services, Inc. (Valley Pacific) for the site at <br /> 930 Victor Road in Lodi (Site). Monitoring at the Site is conducted pursuant to Monitoring and <br /> Reporting Program (MRP) No. R5-2002-0827. <br /> Groundwater monitoring was conducted on 13 January and 7 April 2009 for the first and <br /> second quarters, respectively. Depth to groundwater ranged from about 58 feet below ground <br /> surface (bgs) during the first quarter to about 57 feet bgs during the second quarter. <br /> MW-7 was dry. Groundwater flow was south-southwesterly at gradients ranging from about <br /> 0.004 feet per foot (ft/ft) to 0.02 ft/ft. The observations and gradient calculations are consistent <br /> with historical observations. <br /> Three wells (MW-6R, MW-8, and MW-9R) contained separate phase hydrocarbon (SPH), <br /> MW-6R only in the second quarter and MW-8 and MW-9R in both quarters. The maximum <br /> product thickness was 0.2 feet in MW-8 during January 2009. The Keck "Spoiler" pneumatic <br /> hydrocarbon recovery skimming system was taken out of MW-8 in March 2008 due to <br /> malfunctions that caused the "Spoiler" to remove excess groundwater from the well. GZA <br /> manually removes SPH from these three wells by bailing during quarterly monitoring events. <br /> During the first and second quarters, GZA removed about 7.25 gallons of SPH/water mixture <br /> from these three wells. Valley Pacific also periodically bails SPH/water mixture from these <br /> three wells. The Semi-Annual Report estimates that a grand total of about 1,020 gallons of <br /> SPH/water mixture have been removed from Site wells since April 1994. <br /> Laboratory analyses for the constituents of concern (COCs) at this Site include EPA Method <br /> 8021 B for benzene, toluene, ethylbenzene, and xylenes (collectively BTEX), EPA Method <br /> 8015M for total petroleum hydrocarbons as gasoline (TPHg) and diesel (TPHd), and <br /> EPA Method 8260M for gasoline oxygenate additives. During the first and second quarters, of <br /> the wells where SPH was not present, maximum dissolved concentrations of TPHg and BTEX <br /> were in monitoring well MW-13 at 1,700 micrograms per liter (pg/L), 110 pg/L, 74 Ng/L, <br /> 24 Ng/L, and 110 Ng/L, respectively. These results were all from the first quarter. <br /> California Environmental Protection Agency <br /> �a Recycled Paper <br />