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