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' k" KLEINFELDER PetlOICUn1 constituents detected ui groundwater fiom the three onsite monitoring wells have decreased fiom pievrous samplrn=� Lvcnts(Table 1) ' rhr_ cantanunant plume appeals be on the shape of an oval in the vicinity of the foimet UST and measures approxmlately 220 feet by 160-feet The plume appears to be contained within the boundat res of the subject site Although the northern extent appears in close proxinuty to the northern property boundary near Industrial Drive Kleinfelder has been conducting semi-annual groundwater sampling since the above-referenced ' report The following summary details Klemfelders field activities, findings and conclusions for two semi-annual groundwater sampling events conducted in 2001 ' 20 FIELD ACTIVITIES On August 16 and December 11, 2001, Kleinfelder collected groundwater samples from three monitoring wells (MW-1, MW-2, and MW-3) at the project site (Plate 2) 21 Measurement of Groundwater Levels During each of the two sampling events, three onsite monitoring wells were opened and allowed to equilibrate After approximately 30 minutes, the depth to groundwater was measured in the three wells using a conductivity-based water level indicator The water level indicator was cleaned prior to use in each well to reduce the potential for cross-contamination Measurements were made to the surveyed mark on the north rim of each PVC monitoring well casing The water level measurements, groundwater elevation and gradient from October 1998 to December 2001 are summarized on the attached Table 2 1 2.2 Collection of Groundwater Samples ' After obtaining groundwater depth measurements, Kleinfelder purged and sampled the three monitoring wells MW-1, MW-2 and MW-3 during both sampling events During the purging of the wells, field parameters including temperature, pH, and conductivity were monitored ' Monitoring wells were purged and sampled according to the protocol described in Attachment A, Section A-4 2 A moderate to strong petroleum-like odor was noted from purge water collected from MW-1 during both sampling events No floating product or sheen was noted during the ' August and December 2001 sampling events Copies of the Purge Characterization and Sample Log Sheets are presented in Attachment B 23 Laboratory Analysis ' Three groundwater samples were transported during each of the two sampling events under chain-of-custody control to Agricultural & Priority Pollutants Laboratories, Inc (APPL) of Fresno, California APPL is certified by the California State Department of Health Services (DHS) for the chemical analyses requested During each of the two sampling events, three groundwater samples were submitted for the following analyses 20-4430 01 00312002RO10 Page I of Copyright 2002 Kle:nfc.ldLr Inc January 23, 2002