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PHONE 285 2400 It,1 CABLE ADDRESS TIMOIL TACOMA TE 6//"kk AfIfzR,� A pr (FAX) 206 283 8036 PORTLAND " l "`' f i L !i !it STOCKTON T ? I� r4 RENO ] l2 ] o / ., k a�� RICHMOND 9 23 o f T I M E o1 ,^ LOS ANGELES " 8 4 6 5 TS 2737 WEST COMMODORE WAY SEA LE, WA 98199 1233 T PRODUCTS P O BOX 24447 SEATTLE,WA 98124-0447 TIME TESTED ME July 31, 1996 Mr Harlan Knoll San Joaquin County Public Health Services Environmental Health Division P O Box 2009 Stockton, Califomia 95201 RE Submittal of Groundwater Monitoring Report- Second Half 1996 and Second Quarter 1996 Status Report 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 monitonng 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 Califomia Underground Storage Tank Regulations Because groundwater at the subject site has not been impacted, and soil impacts appear to be residual, the PHS/EHD has reduced requirements for the groundwater monitoring program from quarterly sampling to biannual sampling Accordingly, please find enclosed Science & Engineering Analysis Corporation's (SECOR) "Biannual Monitoring Report, January - June 1996" dated July 22, 1996 This report presents analytical results and field observations collected during First Half 1996 groundwater sampling activities For your convenience a summary of previous site activities Is attached Groundwater Sampling Results- First Half 1996 On May 23, 1996, samples were collected from each of the groundwater monitoring wells (W-3 and W-5 through W-7) at the subject site by a representative of SECOR Prior to purging, the depth to water In each well was measured to evaluate elevation, flow direction, and gradient As noted in the attached report, groundwater with a northeasterly flow at a rate of 0 001 ft/ft was encountered in the wells at depths of 13 45 feet to 14 62 feet below ground surface The location of the wells is identified on Figure 2 of the attached report Since the previous sampling event, groundwater elevation increased in each of the wells by 1 50 feet to 1 65 feet, or an overall average increase in groundwater elevation of 1 55 feet across the site Groundwater flow direction changed from southwest to northeast, however, gradient remained consistent with previously collected data The vanations In groundwater elevation and direction are consistent with Previously collected data and most likely due to seasonal variation Table 1 in the attached report summanzes all groundwater elevation data collected to date Analyses did not indicate presence of hydrocarbons in any of the samples collected from the wells Table 2 in the attached report summarizes historical analytical data, and the laboratory reports for the most recent sampling event are included as Attachment 1