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Tr � <br /> Working To Restore Nature <br /> 1710 Main Street `� ¢ <br /> Escalon, CA 95320 <br /> Phone (209) 838-3507 MAR a <br /> FAX (209) 838-3509 ENVIRQN)MENI AL HEALTH March 18, 1993 <br /> Mr Reggie Mersaroli <br /> Transportation Director <br /> Tracy Public Schools MAR 2 2 a93 <br /> 315 East Eleventh Street <br /> Tracy, California 95376 YMNSPORTATION <br /> RE Groundwater Monitoring and Sampling Results, Tracy Public School Bus Facility, <br /> 315 East Eleventh Street, Tracy, California <br /> Dear Mr Mersaroh <br /> This letter is being submitted by RESNA Industries, Inc (RESNA) to summarize the first <br /> quarter 1993 groundwater monitoring and sampling activities at the above referenced site <br /> On February 18, 1993, RESNA Industries personnel monitored groundwater depths and collected <br /> groundwater samples from each monitoring well on site, T-1, T-2, and T-3 Water level <br /> measurements were collected from each monitoring well using a Solmst Water Level Meter <br /> (Model 101) The depth to groundwater beneath the site ranged from 7 17 to 7 68 feet below <br /> grade, an average rise of 0 76 feet since March 1992 A groundwater gradient map was created <br /> using data collected on February 18, 1993 (Figure 1) According to this information, the <br /> gradient flows to the northeast at 0 0036 feet/toot or approximately 19 ftet;m,lc A summary <br /> of monitonng data is included as Table i <br /> Prior to sampling, 3 to 5 well volumes of water were purged from each well Field purge logs <br /> are included as Attachment 1 The samples were collected using a dedicated, disposable bailer <br /> The samples were submitted to state-certified RESNA Environmental Laboratories in Fremont, <br /> California, and analyzed for benzene, toluene, ethylbenzene, xylenes (BTEX) and total <br /> petroleum hydrocarbons as gasoline (TPHG) using EPA methods 8020 and modified 8015, <br /> respectively All purged water was contained in DOT approved drums and left on site pending <br /> laboratory analyses Laboratory analyses indicate nondetectable concentrations of hydrocarbons <br /> for each well This is consistent with analytical results trom the previous sampling round <br /> 1 QR 1993 FNL <br /> '5 n <br /> w �V <br />