Laserfiche WebLink
i <br /> 5 August 1992 <br /> (GeoAudit CV 30-34E3-1. 47) <br /> Page 3 of 6 <br /> Water samples were collected using disposable plastic bailers. The <br /> samples were collected in two 40 ml EPA vials and 1 liter amber <br /> bottles. The samples were stored in a chilled container and <br /> transported to Alpha Analytical Laboratories. The water samples <br /> were analyzed for TPH as gasoline, BTE&X and total lead. At the <br /> request of Mary Meays, a fecal coliform test was also performed on <br /> the sample from MW-5, because this well is located within 50 ft of <br /> a city sewer line. <br /> SITE GEOLOGY <br />' The site is underlain by interbedded sand, silt, and clay. These <br /> deposits range from well-sorted silt to moderately or poorly sorted <br /> granitic sand, derived from the Sierra Nevada. <br /> Both borings penetrated approximately five feet of surficial <br /> backfill material and gravel (see boring logs) . Light brown to <br /> brown clayey sand and sandy silt are present from 6 to 20 feet. The <br /> sand becomes somewhat coarser grained and better sorted downward. <br /> '�,.. Blue-gray to brown clay is predominant in MW-4 from approximately <br /> 40 ft to 60 ft. In MW-5, this zone is mostly clayey sand. Below 60 <br /> ft, both borings penetrated silty fine--grained sand. Water was <br /> encountered at about <br /> FINDINGS <br /> A slight hydrocarbon odor was observed in soil samples B4-40, B4-45 <br /> and B4-50 (MW-4) , but no volatile organic vapors were detected by <br /> the PID. No odors were detected in samples from MW-5. <br />�1 Four soil samples from 14W-4 and three soil samples from MW-5 were <br /> analyzed for TPH as gasoline, BTE&X and total lead (Table 1) . No <br /> TPH or BTEX were detected in any samples. Lead was at or below <br />' reporting limits in all but two samples. The laboratory report and <br /> chain of custody are attached in Appendix A. <br /> r <br /> The analytical results of the water samples are summarized in Table <br /> 1 2 . The sample from MW-4 was contaminated with TPH as gasoline (300 <br /> gg/L [ppb) ) , benzene ( 19 gg/L) , toluene (5. 1 gg/L) , ethylbenzene <br /> (1. 2 Ag/L) , and xylenes (11 µg/L) . TPH as gasoline was detected at <br /> 9 _ F, to.rc/T. i n thcn% caTnnl n frnm MW-K" AT^ QrrV r.v ...- f4Z-uco-'l i F..V,..,.. <br /> ' •..vi L iLL were <br /> detected in this sample. The laboratory report and chain of custody <br /> are attached in Appendix B. <br /> DEPTH TO GROUNDWATER <br /> The wells were surveyed prior to sampling on 30 June 1992 . Casing <br />