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AM <br /> 1 <br /> d� <br /> Associated Soils Analysis <br /> December 2, 1993 <br /> File No 420-93 <br /> Brian Cobb <br /> E-Z Serve Management Company <br /> 2550 N Loop`Nest,Ste 600 0� <br /> Houston,TX 77292 1.9 <br /> Protect; E-Z Serve Location#100878, 1012 W Yosemite, Manteca, C � <br /> Dear Mr Cobb <br /> In accordance with your request, quarterly groundwater sampling was conducted at the above <br /> subject site on September 15, 1993 This quarterly work package includes a site data summary <br /> table, site groundwater gradient map ;FIGURE 1), laboratory analyses, monitoring well <br /> sampling record, and sampling and purging protocol (ATTACHED) Our field and laboratory <br /> analyses were conducted in accordance with approved ASTM and EPA standards <br /> The site wells contained no measurable free product, and emitted no detectable petroleum odors <br /> Petroleum constituents were detected in each of the monitoring wall samples this quarter, <br /> generally at lower levels than measured last quarter (July 1993) <br /> Groundwater depths at the site have increased relat.ve to last quarter, indicating that the V1 <br /> 11 <br /> groundwater table is lower A site groundwater gradient was determined by calculating the <br /> groundwater elevation in each well (SUMMARY TABLE) and tiiangulating the elevation data <br /> between the wells(FIGURE 1) The site groundwater gradient as determ,ned from wells MIVA, <br /> 5 and 6 is currently flowing toward the northwest at a magnitude of 00013 foot per foot 'Ihe <br /> current groundwater gradient pastern has a slightly lower magnitude and the same general <br /> direction as in the previous quarter's results <br /> ASA recommends re-surveyirLg of the two sets of well head elevations and making all future <br /> groundwater gradient calculations on all wells on the site If you have any questions al.out <br /> these results,please contact our office <br /> Sincerely, ip <br /> ASSOCIATED SOILS ANALYSIS,INC <br /> Na 5574, y <br /> ! Gary J4 Cawthon 6 <br /> ! E R GI 5574; Exp,,9-30,-95 <br /> � 1 <br /> + , IM i <br /> 1 1 1 I I <br /> GJC CFL <br /> ' 1141 Batavia Ct • Tulare, California 93274 (209) 688-1011 „ + <br /> 1 , <br /> ` <br /> { <br /> 14 <br />