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Nib <br /> AMERICAN GEOLOGICAL SERVICES , INC . <br /> — - Environment ; a{`i�"Ofticfoqjp{� Vatural Resource Consultants <br /> Colorado • California irginia • Hawaii • Saipan <br /> April 24, 1998 <br /> Ms. Margaret Lagorio, Lead Senior REHS <br /> Site Mitigation Unit <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 388 <br /> Stockton, CA 95201-0388 <br /> RE: Request to Abandon Additional Monitoring Well, Tracy Cold Storage, Tracy, <br /> California. <br /> Site Code 505329 <br /> Dear Ms. Lagorio, <br /> American Geological Services would like to request that an additional ground water <br /> monitoring well, MW-8, be abandoned in conjunction with the abandonment of four <br /> wells previously approved for destruction at the above-named site. Tree roots from a <br /> willow tree have encroached into the well screen rendering the well inaccessible. It is our <br /> opinion that any recovery efforts would be short-lived and therefore not cost effective. <br /> Monitoring well MW-8 is located to the south of the identified ground water contaminant <br /> plume and has indicated consistent non detectable levels of BTEX constituents since the <br /> June 1996 sampling event. Historical analytical laboratory data for MW-8 ground water <br /> samples are presented in the table below for reference. <br /> Bate Benzene Tolucne Ethyl Total TPI -Gas MTBE <br /> Collected (pg/L) (µg/L) Benzene Xylene (µg/L) (gg/L) <br /> (µg/L) OWL) <br /> MW-8 <br /> 03/22/96 <0.3 0.4 1.2 2.7 420 NA <br /> 06/19/96 <0.3 <0.3 <0.3 <0.6 <50 <1.0 <br /> 10/08/96 <0.3 <0.3 <0.3 <0.6 <50 NA <br /> 12/02/96 <0.3 <0.3 <0.3 <0.6 <50 NA <br /> 04/16/97 <0.3 1 <0.3 <0.3 <0.6 60 NA <br /> 06/17/97 <0.3 <0.3 1 <0.3 1 <0.6 <50 NA <br /> 10/15/97 Well not sampled–tree root encroachment <br /> 12/19/97 Well not sampled–tree root encroachment <br /> 03/30/98 Well not sampled–tree root encroachment <br /> Telephone (209) 532-8021 P.O. Box 3416, 14847 Mono Way, Sonora, CA 95370 FAX(209) 532-3809 <br />