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/ 1 ENVIRCt1MENTAL HEAI_T1� V SWUM ptl-KT SERVICE • ENVIflONMENTALTECHNOLGGIES CORPOflATIGN October 22, 1996 95136 Mr. Jim Cook Olin Interconnect Technology 555 Carnegie Street Manteca, California, 95336 Subject: Groundwater Monitoring and Sampling at 555 Carnegie Street, Manteca, CA Dear Mr. Cook: Smith Environmental Technologies Corporation is pleased to provide you with the results of the groundwater monitoring conducted at the above referenced site (Figure 1). On September 23, 1996, the depth to water was measured in wells MW-1, MW-2 and MW-3. Groundwater elevations are shown in Table 1. The average groundwater elevation has decreased approximately 1.59 feet since March 8, 1996. The groundwater gradient is to the north with a magnitude of 0.004 ft/ft or 21 feet per mile. The groundwater gradient for September 23, 1996 is shown on Figure 2. Groundwater samples were collected from wells MW-1, MW-2, and MW-3 after purging and stabilization of physical parameters (pH, electrical conductivity, and temperature). Well purge logs and field notes are contained in Attachment 1. Collected groundwater samples were placed on ice and transported under chain-of-custody protocol to state certified Sequoia Analytical. Samples were analyzed for priority metals. Results indicated that concentrations of metals either remained the same order of magnitude, decreased, or were not detected since last sampled in June 1995. Analytical results are summarized in Table 2 and laboratory reports and chain-of-custody documentation are contained in Attachment 2. During this monitoring event, the wells were found to be in good condition with no visible defects. The next scheduled activities are in first quarter 1997 and include groundwater monitoring and reporting. w:V 51364epottsbarpLdoc 1260 Graphics Drive - Modesto,CA 95351-1502 • (209)579-2221 • Fax(209)579-2225 Engineering • Consulting • Remediation • Construction