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Tt) <br /> TAIT Environmental Management, Inc. <br /> Environmental - Engineering - Compliance <br /> February 16, 2001 <br /> Kerry Wasson <br /> County of San Joaquin <br /> Facilities Management Division <br /> 1722 East Scotts Avenue <br /> Stockton, California 95205 <br /> Subject: Groundwater Monitoring Report—Fourth Quarter 2000 for San Joaquin <br /> County Motor Pool Facility located at 1810 East Hazelton Avenue in Stockton, <br /> California <br /> Dear Mr. Calvert: <br /> Tait Environmental Management, Inc. (TEM) is pleased to submit three (3) copies of this <br /> Groundwater Monitoring Report for the Fourth Quarter 2000 which summarizes the results of <br /> groundwater monitoring activities performed at the San Joaquin County Motor Pool Facility (SITE), <br /> located at 1810 East Hazelton Avenue in Stockton, California. The groundwater monitoring <br /> activities were conducted by Tait Environmental Management, Inc. (TEM), in accordance with the <br /> San Joaquin County Environmental Health Division, Recommended Groundwater Sampling <br /> Guidelines. <br /> SUMMARY OF ACTIVITIES/FINDINGS <br /> Based upon the data presented in this report, previous investigations, current regulatory guidelines, <br /> and the judgment of TEM, the following summary of findings and conclusions are presented: <br /> • On December 18, 2000, groundwater sampling was conducted for two (2) groundwater <br /> monitoring wells (MW-1 and MW-2). A total of two (2) groundwater samples, one (1) <br /> sample from each well, was collected and submitted to a State-Certified laboratory for <br /> analyses; <br /> • The average depth to groundwater measured at the SITE during this sampling event is <br /> approximately 43.78 feet below ground surface (bgs). An accurate groundwater gradient <br /> and direction of flow could not be calculated due to the limited number of wells at the SITE; <br /> • A slight LPH sheen was observed in monitoring well MW-1; <br /> • TPH-G concentrations in the groundwater samples collected from monitoring wells MWA <br /> and MW-2 were 220,000 micrograms per liter (ug/1) and 57,000 ug/l, respectively. TPH-D <br /> concentrations were not reported at or above the laboratory reporting limit in any of the <br /> groundwater samples; <br /> • Benzene concentrations in the groundwater samples collected from monitoring wells MW-1 <br /> and MW-2 were 51,000 ug/l and 30,000 ug/l, respectively; <br /> 701 North Parkcenter Drive- Santa Ana,California 92705 - (714)560-8200 • (714)560-8235 fax <br /> Regional Offices: San Diego •Concord -Sacramento -Phoenix •Reno <br /> www.TAIT.com <br />