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CRYSTAL CREAMERY STOCKTON <br /> WKA No. 1628.10 <br /> January 16, 2002 <br /> Page 2 <br /> Findings <br /> Groundwater elevations beneath the site ranged from—5.82 to—7.41 feet below mean sea level <br /> (msl). The groundwater gradient varied across the site but was on the order of 0.001 feet/foot, <br /> with flow towards the northeast. Cumulative groundwater elevation data is summarized in <br /> Table 1. Groundwater contours are presented on Plate 2. <br /> Groundwater samples from wells MW2, MW3, MW7 and MW8 had no detectable <br /> concentrations of TPH as gasoline, BTEX, or oxygenates. TPH as gasoline was detected in <br /> L. samples from wells MW1, MW4 and MW5. BTEX was detected in MW4 and MW5. Trace <br /> concentrations of MTBE were detected in wells MWI and MW6. Cumulative analytical results <br /> are summarized in Table 2. Laboratory analytical reports and Chain-of-Custody documentation <br /> are included in Appendix A. <br /> Conclusions <br /> Concentrations of TPH as gasoline in well MW 1 have decreased significantly since 1992,but <br /> have been relatively stable for the last two years. Review of past data reveals no specific trend <br /> with regard to TPH as gasoline concentrations in wells MW4 and MW5. <br /> Limitations <br /> "`0111 The statements and conclusions in this report are based upon the scope of work described above <br /> and on observations made on the date of our fieldwork as presented above. Our work was <br /> performed using a degree of skill consistent with that of competent environmental consulting <br /> L, firms performing similar work in the area. No recommendation is made as to the suitability of <br /> the property for any purpose. The result of our investigation does not preclude the possibility <br /> that materials currently, or in the fixture, defined as hazardous are present on the property. This <br /> �•• report is applicable only to the investigated property and should not be used for any other <br /> property. No warranty is expressed or implied. <br /> If you have any questions,please do not hesitate to contact us. <br /> i�QED GEp< <br /> Wallace-Kuhl &Associates, Inc. ,•• BALA <br /> No.6 <br /> �BAiASpz <br /> 16 <br /> . : CER n <br /> LM <br /> John Pfeifff9er,R. Kurt Balasek,R.G., C.H. or CAL <br /> Project Geologist Senior Hydrogeologist <br /> JCP:KMB:Imb <br /> Copy to: Warren M. Hartzell, CVRWQCB <br /> Mr. Jeffrey Wong, San Joaquin County Public Health Services <br /> �• 1628.10-Qumudy RCPM(4th Qtmtar 2001) <br /> WALLACE•KUHL <br /> Er ASSOCIATES INC. <br />