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t PHONE 285-2400 SEATTLE T CABLE ADDRESS TIMOIL TACOMA E (FAX) 206 283 8036 PORTLAND N STOCKTON II IRENO 2 Tp LOS ANGELES 9 23 NE TIME O I L �M O • $ 4 6 5 T TS 2737 WEST COMMODORE WAY SEATTLE,WA 98199 1233 PRODUCTS PO BOX 24447 SEATTLE WA 98124-0447 TESTED TIME M E April 19, 1995 A Mr Harlan Knoll � �` �' J�l San Joaquin County Public Health Services Environmental Health Division Z 4 �„ P O Box 2009 Stockton, California 95201 ENVIRONMENTAL HEALTH RE Submittal of Groundwater Monitoring Report- First Quarter 1995, PERMITISERVICES Submittal of Remediation Design Specifications, and Quarterly Status Report - First Quarter 1995 for Jackpot Food Mart, 1434 W Yosemite Ave , Manteca, CA (Property No 04-167) Dear Mr Knoll, On June 20, 1994, the San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) requested that Time Oil implement quarterly status reporting and conduct groundwater monitoring until cleanup of the above-referenced site has been achieved Accordingly, this letter is intended to satisfy the requirements for quarterly status reporting as outlined in Article 5, Section 2652 of the California Underground Storage Tank Regulations �1 Please find enclosed Science & Engineering Analysis Corporation's (SECOR) "Quarterly Monitoring Report, January - March 1995" dated April 6, 1995 This report presents analytical results and field observations collected during First Quarter 1995 sampling activities A copy of SECOR's "Soil Vapor Extraction and Treatment System Design Specifications" dated March 13, 1995, is also included for informational purposes For your convenience a summary of previous site activities conducted from April 1992 through April 1995 is included as Attachment 1 Groundwater Sampling Results- February 1995 On February 9, 1995, samples were collected from each of the monitoring wells at the subject site Prior to purging, the depth to groundwater in each well was measured by a representative of SECOR to assist in evaluating changes in elevation, flow direction, and gradient As noted in the attached report, groundwater was encountered at 13 88 feet to 15 10 feet below ground surface Since the previous sampling event groundwater elevation has increased across the site by approximately two feet and flow direction has changed from east to northeast The change in flow direction is consistent with that observed in previous sampling events and is most likely a result of seasonal variation The rise in groundwater elevation is probably due to heavy rainfall during the winter months Table 1 In the attached report summarizes all groundwater elevation data collected to date Neither gasoline nor its constituents were detected in any of the samples collected This sampling event represents the third conzecutive quarter where hydrocarbons have not been in any of the groundwater monitoring wells Table 2. In SFr 0Rs repuit summarizes -A 9poundwater data collected to date, and Appendix B contains analytical reports frorn the rr.ogt recent sampling event The locations of the wells . are presented on Figure 2 f