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Nations Groundwater Associates <br /> HYDROGEOLOOISCS&GEOLOGISTS <br /> May 71, 1ey1 RECEIVED <br /> '{ JUN 3jgq( GiA1 <br /> Mr. Harlan Knoll ETi91RONMENTAL HEALTH <br /> son Joagu in County Pub11C Health services FtpMIT/SCR VIOLS <br /> environmental Health Division <br /> P.D. Box 2009 <br /> Stocktca, California 95201 <br /> Subject: Bi-Annual Ground-Mater Monitoring Report <br /> Loekaford Beacon Mini-Hart j <br /> 13915 Highway 88-11 <br /> Lockeford, California <br /> MGA Project No. to-Qo-104 „ <br /> Dear Mr. Knoll: t <br /> Nati...Groundwater Aeaceiat ea (HGA) has"'.e <br /> authorized to submit <br /> L1� thla Bi-Annual Ground-Water Monitoring Report on behalf of Mr. <br /> Robert Phillipa, queer of the ubj et.alta. Figures 1 and 2 show <br /> ,the acts location and ite feel21tiee. The following sections of <br /> this report describe the results of the most recent sampling event <br /> at the site. <br /> Be,,e of Mark <br /> Thecope of work 'for this report includes the folloxing.. \t <br /> activities. <br /> • collection of Nater level elevation data in April, 1991. I <br /> • Preparatlon of a map depicting the elevation of'Lha <br /> gkound-water surface at the site in April, 1991. <br /> • Purging of a i:inimea of three casing volumes of water <br /> from each monitoring:well and coil—Lion of g—Und-wator <br /> amp2ea. Ground-water sample, w stored in an iced <br /> eooler under Chain-of-custody until dellveey' to <br /> . California-certified laboratory. Ground-water sp piss <br /> were analyzed for benzene,toluene,ethylbenzene,xylenes <br /> (BTPX)1 and total purgaable hydrecarbone (TPH) by�EPA <br /> method a260. <br /> Preparation of this bi-annual monitoring report, <br /> 3090 Fier Clyde,Suite ia[ <br /> SIMM-0,C"111dni,9MV (416)3615095 <br /> -' (916 304915 FAX <br />