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- 7-Eleven/Stockton 19 <br /> August 1990 <br /> California-certified laboratory, GTEL Environmental Laboratories, <br /> Inc. (GTEL) in Concord, California. Each sample was analyzed for <br /> benzene, toluene, ethylbenzene, and xylenes (STEX) , and for total <br /> petroleum hydrocarbons (TPH)-as-gasoline using modified EPA <br /> Methods 5030/8020/9015. The sampling schedule during this period <br /> for the wells on, and near, the site was as follows: <br /> o All operational monitoring wells and pumping wells <br /> PW-1, PW--2, and PW--3 were sampled once during the <br /> quarter, on May 1, 1990. <br /> o Domestic wells TMG, 1912, 1927, 8968, 9140, 9156, 9160, <br /> and 9172 were sampled monthly on three occasions <br /> starting with the sampling round on April 4, 1990. <br /> o Monitoring wells Pnl-15a and MW-15c were sampled twice <br /> during the quarter, on May 2, 1990 and June 1, 1990. <br /> o Monitoring well cluster 17 was sampled twice this <br /> quarter, on April 4, 1990 and May 2, 1990. <br /> The results from groundwater sampling and analyses are <br /> discussed below. A summary of the laboratory analytical results <br /> �- from groundwater samples is provided in Appendix D. The <br /> laboratory analytical reports are provided in Appendix E. <br /> f. <br /> �� GHUE:�n�r:�ree <br />