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_'-S..�w. y- -7•. -u n '� 'P' � w ,7 k9?' L �� `1;..r _ � g '�' �� s -fie S Brown and Caldvacll RECENtu JUN 13 rr=, ENVIRONMENTAL HEALTH June 12, 1990 PERMIT/SERVICES Mr. Kyle Christie ARCO Products Company 2000 Alamedz de 13s Pulbas Post Office Bo- 5811 San Mateo, California 94403 017-3173-54/1 Subject: First Quarter 1990 Sampling Results ARCO Station 2133, 3908 Benjamin Holt Drive,Stockton, California Dear Mr. Christie: On March 8, 9, arid 12, 1990, Brown and Caldwell collected groundwater samples from 15 monitoring wells at the subject site. The samples represent the first quarterly sampling event of 1990, and the last quarterly sampling event under Task Order 2133-89-2A. _ Quarterly Sampling Prior to sampling:-�ells PR-1, PR-2, BHD-1, BHD-2, E-2, E-3, E-4, E-5, E-6, E-7, E-8, E-9, E-10,E-11,and E-12,a diaphragm pump (supplied by Armour Petroleum Services)was used to purge approximately three well casing volumes of water from each. Each well was then saknpled with a Teflon bailer equipped with a bottom-emptying valve. The sample was then drained directly from the bottom valve into two 40-milliliter glass bottles with Teflon-Iined septa. The samples were stored on ice from the Lime of collection through delivery to Eureka Laboratories, All of the samples were analyzed for benzene,ethylbenzene, toluene, and xylene MIX) by U.S.Environmental Protection Agency(EPA)Method 602.• Results are summarized in Table 1. 11e complete laboratory reports are enclosed as Appendix A. All gro_�ndwater produced during the same'ng activity was stored on site pending laboratory analysis. 4 All sampling equipment was de-contarrinated before;sampling each well. Equipment was washed with laborarory-gnat' detergent and rinsed with tap water. A final rinse was completed using deionized water. Table 1 presents the chemical analytical results from the groundwater samples collected over the plat 2 years. BETX constituents in the grown&,; iter samples from well.-PR-1;PR-2,and BHD-2 are below detection Iimits. BETX constituents are detectable in the samples from wells BHD-1, E-2, E-3, E-4, E-5, E-6, E-7, E-8, E-9, E-10, E-11, and E-12, and the benzene concentration exceeds Califoraia Department of Health Services(DHS)Maximum Contaminant Levels(MCLs) of I microgram per liter(µg11).