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EPV€R +;Tt €T1 F€E - OOTHILL <br /> r� t+ NGINEERING <br /> -L!� ;,g,DDY CREEK LANE LODI, CA 9S2�10 <br /> 95 SES' I € ��P ) 368-9381 FAX (209) 367-1163 <br /> Mr. Ronald Rowe September 9, 1996 <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P. O. Box 388 <br /> Stockton, CA 95201 <br /> Site Code #1038 <br /> Subject: Michael D. & Sharon Olivarez, 300 S. California St. Stockton, Ca. <br /> Monitoring Well Information and Results of Sample Analytical Testing <br /> Dear Mr. Rowe, <br /> On July 3, 1996,Del Tech Geotechnical Support Services under the direction of Foothill Engineering, <br /> secured water samples from the monitoring wells on the above stated property. All monitoring wells <br /> were in good condition and samples were taken using the standard recommended procedures. <br /> FINDINGS <br /> MW-1 showed evidence of a free product on the groundwater surface. MWA and MW-2 <br /> groundwater samples produced higher levels of TPHg than previous samples. MW-3 showed lower <br /> levels of TPHg than previous samples (see summary of sample analysis attached). All monitoring <br /> wells showed higher groundwater elevations than previously recorded. The groundwater hydraulic <br /> gradient was lower than previously recorded ( S=.007 vs. S=.017), with the slope in the same <br /> direction. <br /> CONCLUSIONS <br /> The goundwater sample from MW-1 has levels of TPHg that is seven times the amount from the <br /> sample taken on 05/01/95. The most significant difference in results is in the proportions of Toluene <br /> in the latest sample. The 05/01/95 sample had 10.7% Toluene and the is sample had 5% Toluene. <br /> The percentage of Toluene should increases with age as other constituents of gasoline degrade. The <br /> results from MW-2 follow the conventional thinking on how gasoline degrades. <br /> RECOMMENDATIONS <br /> Due to the inconsisent results from the enclosed samples, it is recommended that further definition <br /> of the contaminated area wait until the results of the next quarters samples are available. <br /> Please review the enclosed data, and if you have any questions contact this office. <br /> Respectfully submited, -,. <br /> ooQ,pFESS1pN�l <br /> Footh' En ' ee in 2��`�RiFENgU9 <br /> LU No. 1y752 <br /> Ex � <br /> Ervin Ri enbur PE ��FCAu����R <br /> cc: Olivarez <br />