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1 , <br /> GROUND ZERO ANALYSIS, INC. <br /> 3422 W Hammer Lane, Suite C-294 <br /> Stockton, California 95219 <br /> Telephone- (209) 952-3481 <br /> pigtk� <br /> Facsimile (209) 952-9891 <br /> JUL 2 ` 1905 <br /> July 14, 1995 cN R0NMFp,rtgL f4`ALTy <br /> RM'T/SERI,C- <br /> Mr Michael lnfurna <br /> San Joaquin County PHS/EHD <br /> P O Box 0388 <br /> Stockton, CA 95201-0388 <br /> Subject Second Quarter 1995 Monitoring and Sampling Report, Former Reeve's Exxon, 2360 <br /> East Street, Tracy, California <br /> Dear Mr In€urna <br /> This letter report presents the results of the Second Quarter 1995 groundwater monitoring and sampling <br /> at the subject site (Figure 1) <br /> Groundwater monitoring was conducted on June 28, 1995 on wells MW1, MW2, MW3 (Figure 2) <br /> The groundwater elevations across the site decreased an average of 32 feet since the First Quarter 1995 <br /> monitoring event (Table 1) Figure 3 depicts the groundwater flow direction and hydraulic gradient on <br /> June 28, 1995 Flow direction at the site was generally to the northeast at a gradient of approximately <br /> 006 ft/ft Monitoring data is included in Attachment 1 <br /> On June 28, 1995 after purging at least three casing volumes of groundwater and the stabilization of <br /> temperature, pH, and electrical conductivity, samples were collected from each well in accordance with <br /> the site Well Sampling Protocol Samples were analyzed by Argon Laboratories (ELAP Cert No <br /> 1873) of Ceres, California for benzene, toluene, ethylbenzene, and xylenes (BTEX) by EPA Method <br /> 8020, total petroleum hydrocarbons as gasoline (TPHg) by EPA Method 8015, total petroleum <br /> hydrocarbons as diesel (TPHd) by EPA Modified Method 8015, and Total Recoverable Petroleum <br /> Hydrocarbons (TRPH) by EPA Method 418 1 <br /> Petroleum hydrocarbon analytes were not present above laboratory method detection limits in well MW3 <br /> which is consistent with data collected during previous monitoring events Moderate concentrations of <br /> gasoline range hydrocarbons were detected in the samples collected from wells MW1 and MW2 <br /> Concentrations in these wells have increased since the March 1995 monitoring event <br /> 11 Iwp5Ilgroundzelpestana 03616-28 95 rpt <br />