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E � • <br /> Euwuxux0.Bxuwx J. \ <br /> MATTHEW AL uezWater Boards NIfiviM PAOi4Cr <br /> Ox <br /> Central Valley Regional Water Quality Control Board <br /> 18 September 2013 <br /> L E <br /> Ms. Terri Hernandez <br /> 931 South Oro Avenue <br /> Stockton, CA 95215 <br /> Subject: Sampling R sults, 931 South Oro Avenue, Stockton, San Joaquin County <br /> California Regional Water Quality Control Board, Central Valley Region (Central Valley Water Board) <br /> staff responded to the complaint (#11191 ) that you filed on 19 August 2013 through the CAL/EPA <br /> against the Valero Station, (aka Jamar Se ice) at 4075 East Main Street in Stockton, San Joaquin <br /> County. Please find attached the analytic I results from the water samples collected from your residence <br /> on 26 August 2013. Two samples, labele 931 Oro TT (indoors) and 931 Oro SP (outdoors), were <br /> collected from the toilet tank (TT) and nort iern outside spigot (SP) at your residence. California Water <br /> Service, your municipal water supply agen y, also took water samples from its service line on <br /> 23 August 2013, and they will be providing those results separate from this report. <br /> The following table summarizes the laboratory data results and provides a comparison of established <br /> drinking water standard, where available. The water sample concentrations and drinking water <br /> standards are given in micrograms per Liter of water(ug/L). <br /> Constituents TT SP Drinking Water Standard <br /> u /L <br /> oil and grease 4,100 4,300 NA <br /> bromodichloromethane 1.1 1.1 80 <br /> chloroform 26.6 25.5 80 <br /> gasoline 14.5 J 14.7 J NA <br /> diesel 28.5 J <20 J NA <br /> acetone 3.2 J <0.6 J 6,300 <br /> The results for gasoline, diesel and acetone were notated by the laboratory as "J Flagged". The "J- <br /> Flagged" note clarifies the concentrations are below the laboratory Reporting Limit, which is the <br /> numerical limit at which the laboratory can quantify the concentration of a chemical. However, there is <br /> also a Method Detection Limit, which is the lowest concentration at which the laboratory equipment is <br /> capable of detecting a chemical. Observations of a chemical reported between the Reporting Limit and <br /> the Method Detection Limit are "J Flagged" by the laboratory to indicate an unquantifiable, trace amount <br /> of this chemical detected in the sample. Gasoline was estimated at 14.5 ug/L in the toilet tank and <br /> 14.7 ug/L in the spigot sample. These levels (between the Reporting Limit and the Method Detection <br /> Limit) are believed to be artifacts of the analytical method. In addition diesel was also reported at <br /> There are no drinking water standards established for these compounds <br /> KARL E. LONGLEY SOD, P.E., GIIAIR I PAMELA C. CREEDON P.E., BCEE, EXEOU71VE Orriccn <br /> 11020 Sun Center Drive X200,Rancho Cordova,CA 95670 1 www.waterbo.rds.ca.gov/c.ntralvall.y <br /> 0 FECYGLED PAPPR <br />