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Associated Soils Analysis May 31,1994 File No 420-93 Brian Cobb E-Z Serve Management Company 2550 N Loop West, Ste 600 Houston,TX 77292 PROJECT: E-Z Serve Location #100878, 1012 W Yosemite,Manteca,CA Dear Mr Cobb In accordance with your request, quarterly groundwater sampling was conducted at the above subject site on May 2, 1994 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 No petroleum constituents were detected in monitoring wells MW-1, 3, 4, 6 and 7 this quarter Hydrocarbon levels in all other wells decreased significantly since last quarter, possibly in relation to the rising groundwater table Groundwater depths at the site have decreased by about 7 feet relative to last quarter, indicating that the groundwater table has risen A site groundwater gradient was determined by calculating the groundwater elevation in each well (SUMMARY TABLE) and triangulating the elevation data between the wells (FIGURE 1). The gradient is currently flowing toward the north at a magnitude ranging from 0021 to 0061 foot per foot The current groundwater gradient pattern has a slightly higher magnitude and the same general direction as to the previous quarter's results This gradient determination Incorporates a new well-head survey �f which includes the newly constructed wells If you have any questions about these results,please contact our office Sincerely, ASSOCIATED SOILS ANALYSIS,INC. Of 8 1p G�jwon � r R G 5574 O $574 ° s I' GjC tp , OF VW v i I i ' l 1141 Batavia Ct Tulare, California 93274 a (209) 688-1011 i