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California Regional Water Quality Cor*rol Board <br /> Central Valley Region , <br /> Karl L. Longle.N,SM. P.E.,Chair <br /> Linda S. Adams Arnold <br /> Ilii=u5unlrntril)n\r=?nu kanrhulorduxu.(alilomia �a�n,i�bll-! <br /> /„I' ,�rSchm.arzene�K'er <br /> I'hnnr(1)10) Jh1- 291 • FAX(9 16) Jba--lh-1� <br /> 111/l l)Illi'I!l,l, <br /> Imp %%aicihoar&id_guc rc1111n1\,1110 nrr,r <br /> 29 January 2009 <br /> Mr. Nathan CrumValley <br /> 166 Frank Pacific soServices, inc. 4. <br /> West Wet Circle <br /> Stockton. CA 95206 <br /> SEMI-ANNUAL AND ANNUAL REPORTS, VALLEY PACIFIC PETROLEUM SERVICES, <br /> 930 VICTOR ROAD, LODI, SAN JOAQUIN COUNTY <br /> Regional Water Quality Control Board. Central Valley Region (Regional Water Board) staff <br /> reviewed the 7 January 2009 Semi-Annual Groundwater Monitoring and Sampling Report <br /> (Semi-Annual Report) and the 13 January 2009 Annual Groundwater Monitoring and Sampling <br /> Report 2008 submitted by Ground Zero Analysis, Inc. (GZA) on behalf of Valley Pacific <br /> Petroleum Services. Inc. (Valley Pacific) for the site at 930 Victor Road in Lodi (Site). <br /> Monitoring at the Site is conducted pursuant to Monitoring and Reporting Program (MRP) <br /> No. R5-2002-0827. <br /> During 2008, GZA observed that depth to groundwater ranged from about 54 feet below <br /> ground surface (bgs) during the first quarter to about 61 feet bgs during the third quarter. <br /> MW-7 was dry during the third and fourth quarters. Groundwater flow during the year was <br /> toward the south at gradients ranging from about 0 002 feet per foot (ft/ft) to 0.015 ft/ft The <br /> observations and gradient calculations are consistent with historical observations. <br /> Three wells (MW-6R, MW-8, and MW-9R) contained separate phase hydrocarbon (SPH) <br /> throughout all but the wettest months of the year. The maximum product thickness was <br /> 0.93 feet in MW-8 during July 2008. The Keck "Spoiler' pneumatic hydrocarbon recovery <br /> skimming system was taken out of MW-8 in March 2008 due to malfunuuo ,,c4hat caused the <br /> 'Spoiler” to remove excess groundwater from the well. GZA manually removes SPH f c <br /> these three wells by periodic bailing. During 2008. GZA removed abou' 300 gallons of <br /> SPH/water mixture from these three wells. bringing the grand total reP*ioved since April 10 � <br /> about 970 gallons <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 EPA <br /> Method 8260M for gasoline_oxygenate additives. In 2008, of the wells where SPH was not <br /> present, maximum dissolved concentrations of TPHg and MTBE were in monitoring well MW-7 <br /> at 3,600 micrograms per liter (pg/L) and 1 ,400 pg/L.. respectively. Maximum BTEX <br /> concentrations were reported in MW-13 at 130 pg/L, 160 pg/L, 35 dig/L and 180 pg/L. <br /> respectively. The Semi-Annual Report states that installation of an off-site well east of MW-13 <br /> will commence once site access to the neighboring property is granted. <br /> California Environmental Protection Agency <br />