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05/27/2004 09:38 20946717^—"' AGE STOCKTON PAGE 05/15 <br /> a <br /> 'p rrcyr.! 1617 North Cali iia Street <br /> 4,— February 15, 199!4 <br /> Page 3 - <br /> i 4AA v� <br /> art rr.�`I° <br /> _ <br /> 4.0 feet, a PID reading of 78 parts per million or�pprn •was detected from the soil <br /> 1 boring cuttings. A strong solvent odor was also noted from this depth_ <br /> All soil cuttings were placed and properly securediinto one (l) 55 gallon drum on- <br /> Site. The soil boring location map and soil boring logs are included in the appendix, <br /> of this report. <br /> �,r t <br /> 'I <br /> Conclusions and Recommendations <br /> I 4,I <br />�. Based on the limited field observations completed by NWE in correlation with the <br /> geophysical survey completed by NORCAL, it appears that a UST is not present " <br /> within close proximity of the geophysical anomalies delineated by NORCAL. It <br /> appears that these anomalies are indicative of a cast uori pipe line or remnants of a <br /> similar function. <br /> Organic vapors were detected (78 ppm) at a depth of 4,0 feet in soil boring B-7, <br /> which is near the southern portion of the anomalies_ These vapors appeared to have ti <br /> an odor similar to that of solvents. The vertical and lateral extent of the possible ; <br /> contamination could not be determined from this investigation, which is beyond the <br /> scope of services. The origin of these organic vapors could not be ascertained at <br />{ the time of the on-Site investigation. NWE thereFore recommends further N <br /> investigation on this matter_ It should be noted that an additional investigation of <br /> such concern would require notification of the lead"regulatory agency. <br /> i <br /> LIMITATIONS <br /> I Conclusions reached as the r.e,5ult of analysis done on suspect materials are .not <br /> 100% accurate. Error can occur in two forms: sampling error and cion-uniform <br /> distribution of contaminates, if present, in materials that otherwise appear <br /> homogeneous_ Northwest Envirocou conclusions a3.c based on limited field ` <br /> observations and other pertinent information previously acquired prior to this <br /> investigation_ <br /> I i <br /> If you have any questions, or if we can be',of further assistance, please call <br /> us at (916) 649-3570_ <br /> Sincerel <br /> y, <br /> Jan R. Rutenbergs, REA.#04553 <br /> Project Geologist <br /> 7 <br /> encl. <br /> i <br />