Laserfiche WebLink
r <br /> rfl `.S,elilr#—](f^"'L 11 <br /> Associated Soils Analyses 2. ° ' <br /> January 31, 1994 <br /> File No 420-93 <br /> Brian Cobb <br /> E-Z Serve Management Company <br /> 2550 N Loop West, Ste 600 <br /> Houston,TX 77292 <br /> PROJECT: E-Z Serve Location 4100878,1012 W Yosemite, Manteca,CA <br /> Dear Mr Cobb <br /> In accordance with your request, quarterly groundwater sampling was conducted at the above <br /> subject site on December 21, 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, however, wells MW-3 and MW-5 emitted <br /> detectable petroleum odors Petroleum constituents were detected in each of the monitoring <br /> well samples this quarter Hydrocarbon levels in wells MW-1 and MW-6 decreased in this <br /> round of sampling while the levels in the other wells increased, possibly in relation to the <br /> rising groundwater table <br /> Groundwater depths at the site have decreased by about 2 5 to 3 feet relative to last quarter, <br /> indicating that the groundwater table has risen A site groundwater gradient was determined <br /> by calculating the groundwater elevation in each well (SUMMARY TABLE) and triangulating <br /> the elevation data between the wells (FIGURE 1) The site groundwater gradient as <br /> determined from wells MW4,5 and 6 is currently flowing toward the northwest at a magnitude <br /> of 0 0082 foot per foot The current groundwater gradient pattern has a substantially higher <br /> magnitude and the same general direction as in the previous quarter's results <br /> ASA recommends re-surveying 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 about <br /> these results, please contact our office <br /> Sincerely, <br /> ASSOCIATED SOILS ANALYSIS,INC A Fr sero <br /> 04 <br /> 7Z a y 0 <br /> Gary J C thon No. 5674 i I <br /> R G 5574 <br /> I V I{ I {I IIS { { I�, �'I { I{ { ��O C040�" <br /> GJC tp <br /> { 1141 Batavia Ct • Tulare, California 93274 ' (209) 688-1011 <br /> I � <br />