GEOLOGY AND HYDROGEOLOGY. Topography

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2 GEOLOGY AND HYDROGEOLOGY Topography The site and local topography is based on a review of the USGS topographic map (San Dimas, 1966, Photo-revised 1981 and Ontario, Quadrangle, 1967, Photo-revised 1981). Copies of portions of the two topographic maps were used to create Figure 1, the site location map of this report. The site is at an elevation of approximately 870 feet above mean sea level. The subject property is located in the Pomona Valley below the San Jose Hills and San Gabriel Mountains. The San Jose Hills are approximately one mile north of the site. The base of the San Gabriel Mountains is four miles north of the site. The downtown area of Pomona including the area of the subject site are on a gentle to moderate southwest slope, 10 feet per 1,000 feet, on a broad alluvial fan at the base of the mountains. Geology The Geologic Map of the San Bernardino Quadrangle, 1986 shows the area of the site as Quaternary (Holocene) younger alluvial van deposits (Qyf). These deposits are characterized as Fan deposits of sand and gravel; continuous or intermittent deposition (incipient soil development with thin A horizon). The west-to-northeast trending San Jose Fault is shown at the foot of the San Jose Hills one mile northwest of the site. The San Dimas and Ontario quadrangles were not shown on an index of Alquist-Priolo Earthquake Fault Zone maps (Division of Mines and Geology, Compact Disc, DMG CD ). Hydrogeology The subject site is within the Upper Santa Ana River Valley. Specifically, the site is within the Chino Hydrologic Sub Unit (HSA ) of the Middle Santa Ana River Hydrologic Area (HA ) of the Santa Ana River Hydrologic Unit (HU ) as shown in the Los Angeles Region, Water Quality Control Plan, June 13, The San Jose Creek flood control channel is located at the base of the San Jose Hills, one mile northwest of the site. The San Antonio channel is located approximately 8,000 feet east-southeast of the site. The Upper Santa River Valley is characterized as a 620 square mile basin drained primarily by the Santa Ana River. The Upper Santa Ana River Valley is predominately within San Bernardino and Riverside Counties. The subject site falls within the northwest corner of the Upper Santa River Valley, within Los Angeles County. Specifically, the site is in the westernmost part of the Chino Basin (Figure 2-1, Chino Basin Municipal Water District s Reclaimed Water Master Plan, Montgomery Watson, 1993). Department of Water Resources Bulletin 118, California s Ground Water, September 1975 describes the portion of the Upper Santa River area within Los Angeles County as a 30-square mile basin drained by Live Oak and Thompson Washes with the water BLOCK 5 POMONA, ASSESSMENT REPORT, JULY 15, 2008 PAGE 2

3 bearing material described as Younger Alluvium. The ground water in the portion of the basin within Los Angeles County is described as having moderate to intensive "irrigation and municipal use. Limited for industrial and domestic use. Potable water for the site is from municipal supply. Nearby water well locations were reviewed at the County of Los Angeles, Department of Public Works, Water Resources Division (DPW) and with City of Pomona Public Works Department personnel in Ground water well locations, water production, and well contaminants were reviewed with Mr. Chuck Sihler and Mr. Herzog of the City of Pomona Engineering Department. Depth to ground water measurements for the four closest wells were requested from the DPW via telephone on December 1, The ground water gradient in the downtown area of Pomona is to the east, from a ground water barrier or high approximately ¾ miles west of the civic area. A significant amount of the ground water is produced from multiple production wells near a water treatment plant on the eastern side of the city. The wells are mostly located between Reservoir Street and the county line and south of the railroad corridor. This well production area is approximately ¾ to 1 mile east and down- or crossgradient with respect to ground water flow from the area of the subject site. Three common industrial solvents, ranging in concentration from non-detected to 12 parts per billion, are found in the ground water produced from the wells. The trace levels of the three industrial solvents are removed at the city treatment plant and the contaminants are not detected in the city s municipal water. The contaminants are tetrachloroethylene (PCE, or Perc), trichloroethylene (TCE), and 1,1, Dichloroethylene (DCE). These three chemicals are common industrial solvents. PCE is most commonly used in dry cleaning. TCE and 1,1 DCE are also common co-contaminants and or breakdown products of PCE. Other common volatile organic compounds including the components of gasoline of greatest environmental concern were not detected in the water produced from the ground water wells. The closest well to the site is a private industrial well located at Angelica Textile Services/Health Care Services, 300 East Commercial Street, 700 feet east of the site. Ground water production or water quality information for the private/ industrial well was not available in the public records reviewed. The next closest well to the subject site was municipal well, DPW ID#3244, formerly located in the City of Pomona Civic Center approximately ½ mile southwest of the site. The DPW records indicated ground water was measured in the well at a depth of 350 feet below the ground surface in the 1970s and 200 feet below the ground surface during the last measurement in The DPW currently lists the well as destroyed. BLOCK 5 POMONA, ASSESSMENT REPORT, JULY 15, 2008 PAGE 3

4 The Contour Map Showing Minimum Depth to Ground Water Santa Ana River Valley, California, , U.S.G.S Map MF 1802 was reviewed for historical shallowest depth to ground water. The map shows the historical (1973 to 1979) shallowest depth to ground water as approximately 250 feet below the ground surface. The DPW s San Gabriel Valley, Ground Water Contour Maps for Fall 1992 and Fall 1998 were also reviewed. The maps include the portion of the Santa Ana River Valley that falls within Los Angeles County. These maps show the deep aquifer, in the area of the subject site, at an elevation of 625 and 650 feet above sea level with an inferred ground water gradient to the eastnortheast and southeast, respectively. Ground water was not encountered to the maximum depth of 28 feet drilled at the site. Ground water was not encountered to a depth of 40 feet at other properties investigated by Signal Geoscience in the downtown Pomona area. Based on the above information it is estimated that ground water is at a depth of 200 to 250 feet below the ground surface in the area of the subject property. The ground water flow direction is to the east to southeast. Trace levels, non-detected to 12 parts per billion, of PCE, TCE, and 1,1 DCE are found in wells approximately ¾ mile down-gradient from the site. Review of the State of California, Division of Oil, Gas, and Geothermal Resources Map W1-4 indicates that there are no oil fields within one mile of the site. PROCEDURES Soil Sampling The initial seven soil borings (Boring 1 to 7) were established at the site on September 27 and the eighth soil boring (Boring 8) was established on October 26, Boring 1, 3, 4 and 8 were established in the areas of environmental concern within the existing Auto Body and Paint Shop at 187 E. Commercial Street: Wash Rack, Paint Mixing area, waste oil and antifreeze storage area, and detached spray booth. Borings 4 and 5 were drilled at the location of the former machine shop on the southwest side of the property. Boring 6 and 7 were drilled on the northern half of the block; Boring 6 at a central exposed soil area and Boring 7 adjacent to the foundation of a former shed. Boring 1 and Boring 3 through 7 were established with a direct-push drilling rig. The first soil boring on site, Boring 1, was continuously cored to provide an uninterrupted stratigraphic BLOCK 5 POMONA, ASSESSMENT REPORT, JULY 15, 2008 PAGE 4

5 profile. Boring 1 was planned for a depth of 40 feet but meet refusal on dense soil or rock at a depth of 28 feet. Soil samples were obtained at five foot intervals in each of the borings and at 28 feet in Boring 1. The direct-push drilling samples were obtained by driving the probe to the target depth using static force (weight of the vehicle) and percussion from a hydraulic hammer. At the target depth, the center solid drive point and extension rods were removed. The probe was then driven past the target depth. Upon retrieval of the sampler, the selected depth interval was cut from the acetate liner. The ends of the acetate liner were covered with Teflon tape and capped with an inert lid. Borings 2 and Boring 8 were established with a hand auger due to limited vertical clearance. Both borings were established to a depth of ten feet. Soil samples were obtained at a depth of 5 and 10 feet in the borings. A 3¾-inch diameter hand auger was used to establish the pilot borehole for each of Boring 2 and 8. At the selected sampling intervals the discrete relatively undisturbed soil sample was obtained with a hammer-driven core-sampler loaded with two three-inch long, two-inch diameter tubes. Upon retrieval of the sampler, the ends of the lower tube were covered with Teflon or foil and capped with an inert lid. The samples was labeled and placed in sealable plastic bags. The sample was placed in a chilled container. The samples were transported to a state certified laboratory the same day as sampling, following chain-of-custody procedures. Duplicate soil from the sampling intervals in each soil boring were placed in plastic bags and screened for hydrocarbons using a photo-ionization detector (PID). The on-site geologist logged the soil samples in accordance with the Unified Soil Classification System. The boring logs are attached in Appendix A. The hand auger and drive core sampler were washed and rinsed previous to establishing each boring and/or obtaining each sample. Upon completion of sampling each of the direct push soil borings was backfilled with bentonite. BLOCK 5 POMONA, ASSESSMENT REPORT, JULY 15, 2008 PAGE 5

6 Laboratory Analysis All thirty (30) soil samples were submitted to the laboratory. Representative soil samples from each boring were selected for analysis for the contaminants of concern as follows: Two soil samples from each soil boring, sixteen soil samples total, were analyzed for total petroleum hydrocarbons (TPH) hydrocarbon range in accordance with EPA method 8015Bvolatile for gasoline range organic compounds (C4-C12,) and EPA Method 8015Bextractable for hydrocarbons in the diesel range (C12-C22) and oil range (C23-C40). One soil sample from each boring was analyzed for Volatile Organic Compounds (VOCs) in accordance with EPA method 8260B. Note: A shorter list of VOCs (BTE&X plus oxy.) was checked on the September 27, 2007 chain-of-custody form, but this was corrected with the laboratory and the longer list of VOCs analysis was performed by the laboratory One soil sample from each soil boring was analyzed for priority heavy metals or total lead. The sample selected for analysis from each boring was the shallowest sample from that boring, the five foot sample. One soil sample from each of Boring 2 (B2-D5) and Boring 3 (B3-D5) were analyzed for priority heavy metals in accordance with EPA method 6010 and One soil sample from each of the other six soil borings were analyzed for total lead in accordance with EPA method TPH hydrocarbon range is the measurement of the total amount of hydrocarbons in specified ranges. In this analysis the hydrocarbons were totaled in three ranges: C4-C12 or gasoline range organic compounds (GRO), C13 to C22 or diesel range organic compounds (DRO), and C23 to C40 or oil range organic compounds. The TPH-hydrocarbon range analyses can also be used to produce a graph or gas chromatogram that can be examined for patterns of hydrocarbon type (for example gasoline or diesel). Volatile Organic Compounds (VOCs) include Benzene, Toluene, Ethyl Benzene, & Xylene (BTE&X) and common industrial solvents of environmental concern. Priority heavy metals, also known as seventeen metals of the California Administrative Manual (CAM 17), are the heavy metals of most environmental concern. These heavy metals also occur naturally in soil. The range of these metals in the soil in the western United States from Shacklette, H. T., and Boerngen, J. G.; 1984 Element Concentrations in Soils and other Surficial Materials of the Conterminous United States. U. S. Geologic Survey Professional Paper 127, 105 pp) are noted in Table 3. The Total Threshold Limit Concentration (TTLC) and Soluble Threshold Limit Concentration (STLC) are the concentrations at which the State of California considers the total and soluble portion of an element in a solid of waste to be hazardous. For BLOCK 5 POMONA, ASSESSMENT REPORT, JULY 15, 2008 PAGE 6

7 example the TTLC and STLC for lead are 1,000 mg/kg and 5 mg/l, respectively. The soluble analysis is generally performed when the total amount of an element exceeds ten times the STLC value (10x STLC). Changes from Proposed Work The work was performed as proposed except for the following: Due to refusal on dense soil and rock the deepest soil boring could only be drilled to a depth of 28 feet, not 40 feet as proposed. Eight soil borings were established, not seven. The number of soil samples analyzed by the laboratory was increased to take into account the additional soil boring as follows; sixteen samples were analyzed for TPH-hydrocarbon range (not fourteen), eight samples were analyzed for VOC s (not seven), and six soil samples were analyzed for total lead (not five). RESULTS/RECOMMENDATIONS The soil encountered in the borings consisted mostly of fine-sandy clayey silt (SM), silty sands (SM), fine-to-coarse sand or gravelly fine-to coarse sand (SW). These deposits are interpreted as unconsolidated (not cemented) quaternary alluvium. The laboratory results are summarized in Tables 1, 2, and 3. TPH-hydrocarbon range, total lead, summary of VOCs, and summary of priority heavy metals analyses are shown in Table 1. The complete VOC analysis results are shown in Table 2. The complete Priority Heavy Metals analysis results are shown in Table 3. The complete laboratory reports including quality assurance/quality control data and chain-of-custody form are attached in Appendix B. TPH-hydrocarbon range was not detected in the sixteen soil samples analyzed for these parameters. Volatile Organic Compounds (VOCs) were not detected in the eight soil samples, one from each soil boring, analyzed for these contaminants. Lead was reported at 1 to 3 mg/kg in each of the eight soil samples. The level of lead detected is below or within the range normally expected in soil. BLOCK 5 POMONA, ASSESSMENT REPORT, JULY 15, 2008 PAGE 7

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9 Attachments Figure 1 Site Location Map Figure 2 Site Layout, Block 5 Table 1 Table 2 Table 3 Appendix A Appendix B Soil Boring Sample Analysis Volatile Organic Compounds Soil Sample Priority (Heavy) Metal Analysis Boring Logs Laboratory Reports, September 27 and October 25, 2006 Soil Samples BLOCK 5 POMONA, ASSESSMENT REPORT, JULY 15, 2008 PAGE 9

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12 TABLE 1 SOIL BORING SAMPLE ANALYSIS BLOCK 5, POMONA, CALIFORNIA SAMPLE GASOLINE RANGE C4-C12 DIESEL RANGE C12-C22 OIL RANGE C23-C40 VOLATILE ORGANIC COMPOUNDS (TABLE 2) TOTAL LEAD PRIORITY HEAVY METALS (TABLE 3) 9/27/06 B1-D mg/kg B1-D10 ND (0.1 mg/kg) ND (10 mg/kg) ND (50 mg/kg) ND (1 to 5 µg/kg) B1-D25 ND (0.1 mg/kg) ND (10 mg/kg) ND (50 mg/kg) B2-D5 ND (0.1 mg/kg) ND (10 mg/kg) ND (50 mg/kg) ND (1 to 5 µg/kg) 1 mg/kg ND to 27 mg/kg B2-D10 ND (0.1 mg/kg) ND (10 mg/kg) ND (50 mg/kg) B3-D5 ND (0.1 mg/kg) ND (10 mg/kg) ND (50 mg/kg) mg/kg ND to 30 mg/kg B3-D15 ND (0.1 mg/kg) ND (10 mg/kg) ND (50 mg/kg) ND (1 to 5 µg/kg) B4-D5 ND (0.1 mg/kg) ND (10 mg/kg) ND (50 mg/kg) mg/kg B4-D15 ND (0.1 mg/kg) ND (10 mg/kg) ND (50 mg/kg) ND (1 to 5 µg/kg) B5-D mg/kg B5-D15 ND (0.1 mg/kg) ND (10 mg/kg) ND (50 mg/kg) ND (1 to 5 µg/kg) B5-D20 ND (0.1 mg/kg) ND (10 mg/kg) ND (50 mg/kg) B6-D5 ND (0.1 mg/kg) ND (10 mg/kg) ND (50 mg/kg) mg/kg B6-D15 ND (0.1 mg/kg) ND (10 mg/kg) ND (50 mg/kg) ND (1 to 5 µg/kg) B7-D5 ND (0.1 mg/kg) ND (10 mg/kg) ND (50 mg/kg) mg/kg B7-D15 ND (0.1 mg/kg) ND (10 mg/kg) ND (50 mg/kg) ND (1 to 5 µg/kg) /25/06 B8-D5 ND (0.1 mg/kg) ND (10 mg/kg) ND (50 mg/kg) mg/kg B8-D10 ND (0.1 mg/kg) ND (10 mg/kg) ND (50 mg/kg) ND (1 to 5 µg/kg) ND Not Detected at the detection limit shown in parenthesis mg/kg Milligrams per kilogram or parts per million (ppm) μg/kg Micrograms per kilogram or parts per billion (ppb) Not Analyzed

13 TABLE 2 (Page 1 of 2) VOLATILE ORGANIC COMPOUNDS BLOCK 5, POMONA, CALIFORNIA ANALYSIS B1-D10 B2-D5 B3-D15 B4-D15 B5-D15 Acetone ND (5 µg/kg) ND (5 µg/kg) ND (5 µg/kg) ND (5 µg/kg) ND (5 µg/kg) Benzene ND (1 µg/kg) ND (1 µg/kg) ND (1 µg/kg) ND (1 µg/kg) ND (1 µg/kg) Bromodichloromethane ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Bromoform ND (5 µg/kg) ND (5 µg/kg) ND (5 µg/kg) ND (5 µg/kg) ND (5 µg/kg) Bromomethane ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) 2-Butanone (MEK) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Carbon Disulfide ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Carbon Tetrachloride ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Chlorobenzene ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Chloroethane ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Chloroform ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Chloromethane ND (5 µg/kg) ND (5 µg/kg) ND (5 µg/kg) ND (5 µg/kg) ND (5 µg/kg) Cyclohexane ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Dibromochloromethane ND (5 µg/kg) ND (5 µg/kg) ND (5 µg/kg) ND (5 µg/kg) ND (5 µg/kg) 1,2-Dibromo-3-Chloropropane ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) 1,2-Dibromoethane ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) 1,2-Dichlorobenzene ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) 1,3-Dichlorobenzene ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) 1,4-Dichlorobenzene ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Dichlorodifluoromethane ND (5 µg/kg) ND (5 µg/kg) ND (5 µg/kg) ND (5 µg/kg) ND (5 µg/kg) 1,1-Dichloroethane ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) 1,2-Dichloroethane ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) 1,1-Dichloroethene ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) cis-1,2-dichloroethene ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) trans-1,2-dichloroethene ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) 1,2-Dichloropropane ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) trans-1,3-dichloropropene ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) cis-1,3-dichloropropene ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Ethylbenzene ND (1 µg/kg) ND (1 µg/kg) ND (1 µg/kg) ND (1 µg/kg) ND (1 µg/kg) 2-Hexanone ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Methyl Acetate ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Methylcyclohexane ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Methylene Chloride ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) 4-Methyl-2-Pentanone ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Styrene ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Isopropylbenzene ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) 4-Isopropyltoluene ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) 1,1,2,2-Tetrachloroethane ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Tetrachloroethene ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Toluene ND (1 µg/kg) ND (1 µg/kg) ND (1 µg/kg) ND (1 µg/kg) ND (1 µg/kg) 1,2,4-Trichlorobenzene ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) 1,1,1-Trichloroethane ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) 1,1,2-Trichloroethane ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Trichloroethene ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Trichlorofluoromethane ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) 1,1,2-Trichlorotrifluoroethane ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Vinyl Chloride ND (5 µg/kg) ND (5 µg/kg) ND (5 µg/kg) ND (5 µg/kg) ND (5 µg/kg) Total Xylenes ND (1 µg/kg) ND (1 µg/kg) ND (1 µg/kg) ND (1 µg/kg) ND (1 µg/kg) ND Not Detected at the detection limit shown in parenthesis mg/kg Milligrams per kilogram or parts per million (ppm) μg/kg Micrograms per kilogram or parts per billion (ppb) Not Analyzed

14 TABLE 2 (Page 2 of 2) VOLATILE ORGANIC COMPOUNDS BLOCK 5, POMONA, CALIFORNIA ANALYSIS B6-D15 B7-D15 B8-D15 Acetone ND (5 µg/kg) ND (5 µg/kg) ND (5 µg/kg) Benzene ND (1 µg/kg) ND (1 µg/kg) ND (1 µg/kg) Bromodichloromethane ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Bromoform ND (5 µg/kg) ND (5 µg/kg) ND (5 µg/kg) Bromomethane ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) 2-Butanone (MEK) ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Carbon Disulfide ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Carbon Tetrachloride ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Chlorobenzene ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Chloroethane ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Chloroform ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Chloromethane ND (5 µg/kg) ND (5 µg/kg) ND (5 µg/kg) Cyclohexane ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Dibromochloromethane ND (5 µg/kg) ND (5 µg/kg) ND (5 µg/kg) 1,2-Dibromo-3-Chloropropane ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) 1,2-Dibromoethane ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) 1,2-Dichlorobenzene ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) 1,3-Dichlorobenzene ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) 1,4-Dichlorobenzene ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Dichlorodifluoromethane ND (5 µg/kg) ND (5 µg/kg) ND (5 µg/kg) 1,1-Dichloroethane ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) 1,2-Dichloroethane ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) 1,1-Dichloroethene ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) cis-1,2-dichloroethene ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) trans-1,2-dichloroethene ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) 1,2-Dichloropropane ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) trans-1,3-dichloropropene ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) cis-1,3-dichloropropene ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Ethylbenzene ND (1 µg/kg) ND (1 µg/kg) ND (1 µg/kg) 2-Hexanone ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Methyl Acetate ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Methylcyclohexane ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Methylene Chloride ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) 4-Methyl-2-Pentanone ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Styrene ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Isopropylbenzene ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) 4-Isopropyltoluene ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) 1,1,2,2-Tetrachloroethane ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Tetrachloroethene ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Toluene ND (1 µg/kg) ND (1 µg/kg) ND (1 µg/kg) 1,2,4-Trichlorobenzene ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) 1,1,1-Trichloroethane ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) 1,1,2-Trichloroethane ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Trichloroethene ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Trichlorofluoromethane ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) 1,1,2-Trichlorotrifluoroethane ND (2 µg/kg) ND (2 µg/kg) ND (2 µg/kg) Vinyl Chloride ND (5 µg/kg) ND (5 µg/kg) ND (5 µg/kg) Total Xylenes ND (1 µg/kg) ND (1 µg/kg) ND (1 µg/kg) ND Not Detected at the detection limit shown in parenthesis mg/kg Milligrams per kilogram or parts per million (ppm) μg/kg Micrograms per kilogram or parts per billion (ppb) Not Analyzed

15 TABLE 3 SOIL SAMPLE PRIORITY HEAVY METAL ANALYSIS BLOCK 5, POMONA, CALIFORNIA ANALYTE B2-D5 B3-D5 TTLC STLC Normal Range In Soils, Western U. S.* Antimony ND (2 mg/kg) ND (2 mg/kg) mg/kg Arsenic 1 mg/kg 2 mg/kg mg/kg Barium 23 mg/kg 30 mg/kg 10, mg/kg Beryllium ND (1 mg/kg) ND (1 mg/kg) mg/kg Cadmium ND (0.5 mg/kg) ND (0.5 mg/kg) mg/kg Chromium 10 mg/kg 12 mg/kg 2, mg/kg Cobalt 4 mg/kg 5 mg/kg 8, mg/kg Copper 8 mg/kg 8 mg/kg 2, mg/kg Lead 1 mg/kg 1 mg/kg 1, mg/kg Mercury ND (0.1 mg/kg) ND (0.1 mg/kg) mg/kg Molybdenum ND (1 mg/kg) ND (1 mg/kg) 3, mg/kg Nickel 6 mg/kg 8 mg/kg 2, mg/kg Selenium ND (2 mg/kg) ND (2 mg/kg) mg/kg Silver ND (1 mg/kg) ND (1 mg/kg) mg/kg Thallium ND (2 mg/kg) ND (2 mg/kg) mg/kg Vanadium 15 mg/kg 15 mg/kg 2, mg/kg Zinc 27 mg/kg 24 mg/kg 5, mg/kg ND Not Detected at the level shown in parenthesis STLC Soluble Threshold Limit Concentration (mg/l) TTLC Total Threshold Limit Concentration (mg/kg) * Shacklette, H. T.., and Boerngen, J. G.; 1984 Element Concentrations in Soils and other Surficial Materials of the Conterminous United States. U. S. Geo. Surv. Professional Paper 127, 105 pp

16 APPENDIX A BORING LOGS

17 SIGNAL GEOSCIENCE Project Block 5 Pomona Date 9/27/06 Boring 1 Project Number Location 187 E. Commercial, Wash Rack Logged by David Lesperance, P. G. Rig Direct push (Geoprobe) Bucket Size 2 Time Started Depth Feet Sample No. OVM PID Blows/ ½ foot Color Moisture Consistency Description Concrete 0 Brown Silty very fine-to-fine sand (SM), some gravel to 1/4 inch Notes 5 Light olive B1-D5 9 brown Damp Gravelly fine-to-very coarse sand (SW) No odor 0 Light olive brown Very fine sandy silt (ML) 10 Light olive B1-D10 7 brown Damp Fine-to-very coarse sand (SW) No odor 15 Light olive B1-D15 brown Moist Very fine sandy silt (ML) No odor 0 Fine-to-very coarse sand (SW) B1-D20 Fine-to-very coarse sand (SW) 4 feet of interbedded layers (½ to 1 thick) of 0 Very fine-to-fine sand (SP), Very fine-to-fine sandy clayey silt (SL), and Silty very fine-to-fine sand (SL/SP) 0 Light olive B1-D25 0 brown Silty very fine-to-medium sand (SM) No odor 30 B1-D28 0 Sand Continuous macro core to total depth Bottom of boring at 28 feet, refusal 35 40

18 SIGNAL GEOSCIENCE Project Block 5 Pomona Date 9/27/06 Boring 2 Project Number Location Paint Mixing Booth in Building Logged by David Lesperance, P. G. Rig Hand Auger Bucket Size 3¼ Time Started Depth Feet Sample No. OVM PID Blows/ ½ foot Color Moisture Consistency Concrete Description Notes 5 Olive Gravelly (to ½ ) silty very fine-to-fine coarse B2-D5 brown Damp sand w/some sand-size silt rock fragments No odor 10 B2-D10 Olive gray Fine-to-coarse sand (SW) No odor Bottom of Boring at 10 feet

19 SIGNAL GEOSCIENCE Project Block 5, Pomona Date 9/27/06 Boring 3 Project Number Location Outside Spray Paint Booth Logged by David Lesperance, P. G. Rig Direct push (Geoprobe) Bucket Size 1.5 Time Started Depth Feet Sample No. OVM PID Blows/ ½ foot Color Moisture Consistency Asphaltic Concrete Description Notes 5 B3-D5 0 Brown Damp Silty clayey (10%) very fine-to-medium sand No odor 10 Olive Dry/ Gravelly very fine-to-very coarse sand (SW) No odor B3-D10 0 brown damp 15 Olive B3-D15 0 brown Moist Very fine sandy clayey silt (ML) No odor 20 Moist/ Silty very fine sand (SM) B3-D20 0 Brown damp Lower 3, Gravelly (to 1 ) very fine-to-coarse Sand (SW) Bottom of Boring at 20 feet

20 SIGNAL GEOSCIENCE Project Block 5, Pomona Date 9/27/06 Boring 4 Project Number Location Southwest side of block, Logged by David Lesperance, P. G. middle of former machine shop area Rig Direct push (Geoprobe) Bucket Size 1.5 Time Started Depth Feet Sample No. OVM PID Blows/ ½ foot Color Moisture Consistency Concrete Description Notes 5 Olive B4-D5 0 brown Damp Silty very fine-to-coarse sand (SM) No odor 10 Olive B4-D10 0 brown Damp Gravelly (to ½ ) fine-to-very-coarse sand (SW) No odor 15 Olive Damp/ B4-D15 2 brown moist Clayey silty very fine-to-fine sand (SM) No odor 20 Dark yellowish Dry/ B4-D20 0 brown damp Gravelly very fine-to-coarse sand (SW) Bottom of Boring at 20 feet

21 SIGNAL GEOSCIENCE Project Block 5, Pomona Date 9/27/06 Boring 5 Project Number Location Southwest side of block Logged by David Lesperance, P. G. former machine shop Rig Direct push (Geoprobe) Bucket Size 1.5 Time Started Depth Feet Sample No. OVM PID Blows/ ½ foot Color Moisture Consistency 4 thick concrete Description Notes 5 B5-D5 0 Brown Damp Clayey silty (10%) very fine-to-fine sand (SM) No odor 10 Brown Damp Slightly clayey silty very fine-to-medium sand No odor B5-D10 0 Gravelly fine-to-coarse sand 15 Light olive B5-D15 0 brown Damp Silty very fine sand (SM) No odor 20 Olive brown Damp Silty very fine-to-very coarse sand (SM/SW) No odor B5-D20 0 Brown Gravelly very fine-to-very coarse sand (SW) Bottom of Boring at 20 feet

22 SIGNAL GEOSCIENCE Project Block 5, Pomona Date 9/27/06 Boring 6 Project Number Location Western central side of Logged by David Lesperance, P. G. northern half of block Rig Direct push (Geoprobe) Bucket Size 1.5 Time Started Depth Feet Sample No. OVM PID Blows/ ½ foot Color Moisture Consistency Description Exposed soil. About 3 feet higher elevation then south side of block. Notes 5 Light olive B6-D5 0 brown Dry Silty very fine-to-fine sand (SM) No odor 10 Olive Dry/ B6-D10 0 brown damp Silty very fine-to-very coarse sand (SM) No odor 15 Light olive B6-D15 0 brown Moist Silty clayey very fine sand 20 Silty clayey very fine sand Light olive brown Silty clayey very fine-to-very coarse sand some pebbles B6-D20 0 Olive brown Moist Very fine silty clay No odor Bottom of Boring at 20 feet

23 SIGNAL GEOSCIENCE Project Block 5, Pomona Date 9/27/06 Boring 7 Project Number Location Just outside foundation of former Logged by David Lesperance, P. G. shed, Northern half of block Rig Direct push (Geoprobe) Bucket Size 1.5 Time Started Depth Feet Sample No. OVM PID Blows/ ½ foot Color Moisture Consistency Fill soil Description Notes 5 Brown Damp Clayey silty very fine-to-very coarse sand at 4.5 B7-D5 0 Clayey silty very fine-to-fine sand (SM) at 5 10 Light olive Dry/ B7-D10 0 brown damp Gravelly (to 1 ) very fine-to-medium sand w/ No odor some coarse to very coarse sand 15 Pale olive B7-D15 0 brown Damp Very fine sandy silt (ML) 20 Light olive B7-D20 0 brown Damp Silty very fine-to-fine sand (SM) No odor Bottom of Boring at 20 feet

24 SIGNAL GEOSCIENCE Project Block 5, Pomona Date 10/25/06 Boring 8 Project Number Location Logged by David Lesperance, P. G. Rig Hand Auger Bucket Size 3¼ Time Started Depth Feet Sample No. OVM PID Blows/ ½ foot Color Moisture Consistency Concrete core Description Notes 5 B8-D5 10 B8-D10 Bottom of Boring at

25 APPENDIX B LABORATORY REPORTS, SEPTEMBER 27 AND OCTOBER 25, 2006 SOIL SAMPLES

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