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S G + 4 Color Spot, Inc. June 28, 1991 (M88168G) Sample number 5, collected from the smaller excavation at a depth of 3 feet, contained detectable levels of l toluene whi (3exc ed)drinking ze er ne (0.9 ppm), xylenes (12,0 ppm), and TYH (10,000 ppm) (seeremovedble stockpiledds �nasmconfirmed by sample numbersinated soil adjacent to 7, a d 9 sample was Analytical results from the soil samples collected from a depth of 8 feet in the second, smaller excavation contain the same relative concentrations sample as the samples collected below the former were detected tank locations. except toluene innconcen- numbers 7, 8, and m, respectively. None of these levels trations of 0.037, 0.049, and 0.047 pp exceed the DHS drinking water action level. SITE HYDROGEOLOGY Table 2 - Depth to Ground Water, contains ground water data for the about d at site. 1n October 1990, ground waapLroximately 900was efeet northwestfOftthe ssubjecby t personnel in a drill hole (DH-2) PP excavations of this letter Control and Water Conservation District (Distrreport (refer to Figure 2) . ict) data tfor water �- Joaquin, Flood C ater at levels in wells indicate el te85hfeedebgs•tD ground Curren wdata was not available efromlthe 1990 was approximat y riting of this letocatea approximately feet 800 grounde depth of district at the time of the wd well n May 22, 1991 at 74.5 water in monitoring wnumber 1 ( -1). northwest of the subject excavations, was measured by SGD o feet bgs. There are six known water wells within 1,200 feet of the subject excavations, as to shown on Figure 2. At least two of these wel�oloreSpot wwell discharge ground water into storage tanks on a daily basis ells may numbers 1 and 4). The drawdown from these or other uaffect the mping Water levels, static water level in MW-1. 1'erforateds hed ing es in the above -m ntioned wells are not water levels, and daily pumping available at this time. i CONCLUSIONS AND RECOMMENDATIONS The soil sample analyses indicate that soils left in place beneath 22, he -, ernm th the east end of the fotherDHScation drinks g of t atetrstandardtfornt luene.d The aState 1991 slightly exceed -== - ----- --------------- -- ---- --.. Water_.Control._Board has provided a methodology for estimating levels of to 2 and -._.... .. gra- - -----, --- - - ' T that can be left in place. This-medescribed_.on_pages_27_to 29 Of ---