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California6egional Water QualitoControl Board <br /> vCentral Valley Region <br /> Robert Schneider,Chair <br /> Winston H.Hickox Gray Davis <br /> Secretaryfor Fresno Branch Office Governor <br /> Environmental Intemet Address: http://www.swrcb.ca.gov/—mgcb5 <br /> Protection 1685 E Strect,Fresno,California 93706-2020 <br /> Phone(559)445-5116•FAX(559)445-5910 <br /> Mr. M. Scott Mansholt 15 July 2003 <br /> Chevron Environmental Management Company <br /> P.O. Box 6012 <br /> San Ramon, California 94583 <br /> SEMIANNUAL 2003 GROUNDWATER MONITORING REPORT (JANUARY - JUNE), <br /> LYOTH LOADING STATION,TRACY, SAN JOAQUIN COUNTY <br /> We have reviewed the Semiannual 2003 Groundwater Monitoring Report(January-June),former <br /> Lyoth Loading Station, Tracy, San Joaquin County (Report), dated 29 April 2003, prepared on behalf of <br /> Chevron Environmental Management Company by Science Applications International Corporation <br /> (SAIC). The Report provides the 12 March 2003 groundwater monitoring analytical results for the Old <br /> Valley Pipeline site located at the Former Lyoth Loading Station property in Tracy, CA. <br /> Concentrations of total petroleum hydrocarbons as diesel (TPH-d) at 130 µg/L and 370 µg/L(w/o silica <br /> gel cleanup), was reported in MW-1 and MW-6, respectively. No other petroleum hydrocarbons or <br /> semi-volatile organic compounds were detected during this event. Monitoring well MW-2 was not <br /> sampled due to the presence of 0.08 foot of separate-phase petroleum present on the water. Consistent <br /> with previous monitoring events, the groundwater gradient is north-northwesterly and depth to water <br /> ranges between 17 feet and 21 feet below grade. <br /> Based on previous and current monitoring events, it appears that the extent of impacted groundwater <br /> north of MW-1 and MW-6 has not been adequately characterized. We believe that a hydrophobic <br /> absorbent sock should be placed in MW-2 and monitored quarterly until the next semi-annual <br /> groundwater-monitoring event takes place later this year. After reviewing the next semi-annual report <br /> and analytical results, we will evaluate the possibility of conducting additional soil and groundwater <br /> testing downgradient(northerly) of monitoring wells MWA and MW-6. <br /> If you have any questions please call Dean Hubbard at (559)445-5179. <br /> S LTO N R. GRAY C.DEAN HUBBARD. <br /> Senior Engineering Geologist Associate Engineering Geologist <br /> RG 6357 <br /> cc: Mr. Mike Infurna, San Joaquin County Environmental Health Department, Stockton <br /> Mr. Bryan Turner, Geomatrix, Oakland <br /> Mr. Garrett Michael Turner, SAIC, Oakland <br /> California Environmental Protection Agency <br /> ed Recycled Paper <br /> The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. <br /> For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at http:tt w .swreb.ca.gov/mgcb5 <br />