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TABLE 1 ANALYTICAL RESULTS OF SOIL SAMPLES:TTLC METALS HIGHLAND VILLAS PROPOSED 26528 Hayward Boulevard,Hayward,California (mg/kg) 60108 7471 Sample ID Date Sb As Be Be Cd Cr Ca Cu- Pb' Mo Ni Se Ag. V Zn Hg Highland Village Property SS-1,2,3,4 06/03/15 <1 18 480 <1 <1 40 24 63 39 <1 36 <1 <1 99 130 <0.05 SS-5,6,7,8 06/03/15 <1 18 420 <1 <1 39 23 62 46 <1 37 <1 <1 95 130 <0.05 SS-9,10,11,12 06/03/15 <1 16 360 <1 <1 36 18 53 120 <1 38 <1 <1 61 95 <0.05 SS-13,14,15,16 06/03/15 <1 22 440 <1 <1 46 20 69 26 <1 47 <1 <1 180 120 <0.05 SS-17,18,19,20 06/03/15 <1 19 400 <1 <1 44 20 63 20 <1 45 <1 <1 67 110 <0.05 Averaged - 18.6 420 - 41 21 62 50.2 40.6 100.4 117 concentrations ESL 20 0.39 750 4 12 1000 23 230 80 40 150 10 20 200 600 6.7 CHSSL 300 0.07* 5,200 150 1.7 100,000 660 300 150 380 1,600 380 380 530 23,000 18 Notes: mg/kg:milligrams per kilogram Sb: Antimony Pb: Lead ESL:Environmental Screening Levels As: Arsenic Hg: Mercury CHSSL:California Human Health Screening Level Be: Barium Mo: Molybdenum Be: Beryllium Ni: Nickle Cd: Cadrrcum Se: Selenium Cr: Chromium Ag: Silver Co: Cobalt TI: Thallium Cu: Copper V: Vanadium Zn: Zinc *: Naturally occurring background concentrations of arsenic,beryllium,cadmium,chromium and other metals in soils may exceed their respective soil CHHSLs. Cal/EPA generally does not require cleanup of soil to below background levels. This issue is frequently encountered with arsenic. Natural background concentrations of arsenic in California are often well above the health-based, direct-exposure goals in soil of 0.07 mg/kg for residential land use and 0.24 mg/kg for commercial/industrial land use(e.g.,Bradford et.al,1996;LBNL 2002). Background concentration of arsenic or other metals of potential concern at a site should be determined from analysis of site-specific samples in uncontaminated areas using guidance published by CaVEPA and/or reference to published data for nearby sites(Cal/EPA 1997). However,background data for nearby sites may only be used as a surrogate for uncontaminated site data if those data are obtained from soil of the same lithology as that found on-site.