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03/27/02 WED 13 40 FAX 19168582355 <br /> GROUNI}WATE12 004 <br /> TNN quarter 2001 Me Annng and Sampling Repod and Pre-Closure sampling WarkplELn 3 <br /> 7-Eleven'Inc 5lore;A 7647,1048 Wet!Yosemite A-venue,,_Manteca GA .« octaber A 2045 <br /> t <br /> j Sensitive Recep ors <br /> j As mentioned prfviously,a sensitive receptor evaluation for this site Indicates that the nearest public supply <br /> 1 wells are approve nately 993 feet to the north Two wells are also lobated approximately 4,956 feet southwest <br /> of the site <br /> I <br /> Purge Water Tr,insportation and Disposal <br /> All purge water 4 enerated during this quarterly monitoring and so m piing event was stored in 55-gallon <br /> Department of 3 ransportaton(DOT)-approved drums pending cir s racterizabon and proper disposal <br /> Approximately 13 gallons of purged water generated during this sarnpling event will be removed from the site <br /> and transported to a licensed treatment and disposal facility <br /> t <br /> Workplan for Fre-Closure Sampling <br /> Laboratory ana yses for 1,2-DCA and EDS will be conducted on Iimples collected from the groundwater <br /> monitoring well,during the fourth quarter 2001 <br /> In addition, one soli boring is proposed to be installed as shown la ►Figure 2 to a depth of 20 feet below grade. <br /> Direct-push hydraulic ng drilling methods will be used: All dnllin g equipment will be cleaned prior to drilling, <br /> and sampling t gwprnent will be washed in an Alconoxe(detergi. It)solution and rinsed with water between <br /> sampling inten air, Ali soil and rinse water generated during thet Irilling will be placed in labeled Department <br /> of Tralnsportatian(DOT),approved 55-gallon drums and left on a site pending transportation and disposal, <br /> The boring will be backfilled to grade wrth cement/bentonite ani I patched at grade to match the surrounding <br /> surface, <br /> Continuous sc iI samples will be collected from 5 feet below galls to total depth using GeoprobelMacrocore <br /> techniques Soil samples will be field screened for hydrocarba rt vapors using a photo-ionization detector <br /> Soil will be logged using the Udfied Soil Classification System 1511,an IT Corporation field geologist working <br /> under the supervision of a California registered geologist One t`I-inch sample tube from each 5-foot depth <br /> will be sealed labeled, and placed on ice In an Insulated contairier for transport under chain-of-custody to a <br /> state-+certrted laboratory for analysis of STEX, MTSE and TPHAP using EPA Methods 8024/modified 8015, <br /> and for oxygenates;analysis by EPA Method 8260 Selected s al riples will be analyzed based on field <br /> instrument re 3dings and proximity to the capillary fringe <br /> One groundN ater sample will be collected at the base of the tic nng using arther a hydropunch or in <br /> temporanly-installed casing(sample collected using a disposeitile bailer) The water sample will then be <br /> transferred tr 40-milliliter glass vials filled to zero headspace,a giddied to a pH of 2,sealed vinth Teflone- <br /> septum caps, labeled,placed on ice In an insulated container,i lnd transported under chain-of-custody to a <br /> state-certiheiI laboratory for analysis of BTEX and TPH-G usinj,r EPA Methods 80201modified 8015,and for <br /> I oxygenates, t,2 DCA,and EDB analysis by EPA Method 8260 <br /> � r <br /> I <br /> r + 21?561%4 rpt <br /> Ef <br />