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GROUNDWATER �❑ TECHNOLOGY INC. _ � 4057 Port Chicago Highway Concord CA 9452014151 b r 1?387 �1 FAX (415)685 9148 May 19, 1993 Project No 020301211 U0 Mr Bob Vasquez �11�y Q , ��► The Southland Corporation tl 4� A 5820 Stoneridge Mali Road, Suite 310 tti;4A�gT Al Pleasanton, CA 94588 EN'S ,,el't SUBJECT First Quarter Monitorina and Sampling Report, 1 ' Southland Site No 20680 9110 Thornton Road, Stockton, California Dear Mr Vasquez This First Quarter Monitoring and Sampling Report 1993 presents monitoring and sampling activities performed by Groundwater Technology, Inc between January 1 and April 2, 1993, at The Southland Corporation (Southland) 7-Eleven Site No 20680 located at 9110 Thornton Road in Stockton, California (Attachment 1, Figure 1) As illustrated on the site plan (Figure 2), the store Is on the northern corner of Thornton Road and Waudman Avenue in a mixed commercial and residential area Actroities during this reporting period included ■ Collecting groundwater samples from domestic wells 8968, 9036, 1912, 9140, 9156, and 9172 on January 22, February 26, and April 2, 1993 ■ Monitoring available groundwater monitoring wells for depth to water (DTW) on April 2, 1993 + Collecting groundwater samples from monitoring wells MW-1, MW-5, MW-7, MW-8, MW-9, MW-13, MW-16, MW-18, MW-19, MW-20, cluster wells MW-15ABC and MW-17ABC, former pumping wells PW-1, PW-2, and PW-3, and former recovery well RW-1 on April 2, 1993 GROUNDWATER MONITORING DATA I The DTW In the groundwater monitoring wells was monitored on April 2, 1993 The monitoring data are presented in Attachment 2, Table 1 Groundwater in the monitoring wells was allowed to stabilize to atmospheric pressure before monitoring water levels The DTW was measured to the Inearest 0 01 foot from the top of the well casing, using an INTERFACE PROBtrm Well Monitoring 12118023 Offices throughout the U 5 Canada and Overseas