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June 26, 1996 <br /> .` 92-1177102 97 <br /> NORCAL Waste Systems, Inc <br /> Attention Ms Amy Dietz, Environmental Chemist <br /> Subject REPORT - Quarterly Groundwater Monitoring - June 1996 <br /> Stockton Scavenger Association Facility <br /> 1240 Navy Drive <br /> Stockton, California <br /> Page 3 <br /> Analytical Results <br /> TPH-g and BTEX were detected at trace amounts in the groundwater sample collected <br /> from Monitoring Well MW-2 TPH-g and BTEX were not detected in samples collected from <br /> any other monitoring wells TPH-d was detected at trace amounts in the groundwater samples <br /> from Monitoring Wells MW-2, and MW-4 TPH-d was not detected in Monitoring Wells MW-1 <br /> and MW-3 Analytical results are summarized in Table 2 and copies of the laboratory report <br /> and Cham-of-Custody record are included in Appendix C <br /> Evaluation <br /> Water level measurements indicate that groundwater flow is generally toward MW-2 (see <br /> . Drawing 3) Factors potentially influencing the site groundwater flow conditions may include <br /> M Groundwater pumping from the treatment system, <br /> ® Variation in thicknesses and type of backfill material used, and <br /> G Surface water infiltration through utility trenches or landscape watering <br /> The analytical data suggests that groundwater quality underlying the site is relatively <br /> unchanged as compared with the previous monitoring period Trace concentrations of BTEX, <br /> TPH-d and TPH-g continue to be predominantly found in the vicinity of MW-2 Note that <br /> Drawings 4 through b indicate spatial concentration distributions of the site constituents of <br /> concern <br /> Professional Certification <br /> This report has been prepared by The MARK Group, Inc under the professional <br /> supervision of the Principal and or senior staff whose seal(s) and signature(s) appear hereon <br /> The data, observations, findings or professional opinions are presented, within the limits <br /> prescribed by the client, after being prepared in accordance with generally accepted professional <br /> engineering and geological practice There is no other warranty, either expressed or implied <br />.D <br />