Phase II Environmental Site Assessment Boys and Girls Club
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Phase II Environmental Site Assessment Boys and Girls Club 9330 SE Harold Street Portland, Oregon October 1, 2010 Prepared for Portland Development Commission Portland, Oregon 333 SW 5th Avenue, Suite 700 Portland, OR 97204 (503) 542-1080 TABLE OF CONTENTS Page INTRODUCTION 1 BACKGROUND 1 WORK PERFORMED 2 ANALYTICAL RESULTS 4 CONCLUSIONS AND RECOMMENDATIONS 5 USE OF THIS REPORT 6 REFERENCES 8 FIGURES Figure Title 1 Vicinity Map 2 Anomalies and Subsurface Investigation Locations TABLES Table Title 1 Summary of Geophysical Anomaly Exploration 2 Test Pit Analytical Results 3 Soil Boring Analytical Results APPENDICES Appendix Title A Photograph Log B Boring Logs and Geotechnical Hole Reports C Laboratory Analytical Reports 10/1/10 I:\PROJECTS\1095\006\020\FILERM\R\FINAL PHASE II ESA\PHASE II ESA_RPT_FINAL.DOCX LANDAU ASSOCIATES ii INTRODUCTION This report summarizes the findings of a focused Phase II Environmental Site Assessment (ESA) conducted for the Lents Boys and Girls Club of Portland located at 9330 SE Harold Street in Portland, Oregon (subject property, Figure 1). The focused Phase II ESA was conducted by Landau Associates for the Portland Development Commission (PDC), based on the statement of work outlined in our scope of work dated July 28, 2010. This report summarizes the field activities conducted during the Phase II ESA and discusses the investigation findings and results. Conclusions based on the findings and recommendations for further action, as appropriate, are also included. BACKGROUND The Phase I ESA performed by Landau Associates (Landau Associates 2010) revealed evidence of two recognized environmental conditions in connection with the subject property: • Between 1935 and 1970, a gasoline/service station was located on the northeast corner of SE Harold Street and SE 92nd Avenue, directly across SE Harold Street from the subject property. No information regarding the presence or absence of contamination or underground storage tanks (USTs) associated with the historic gasoline/service station was found. Borings along the northern property boundary, across SE Harold Street from the historic gasoline/service station property were recommended to determine that no contamination had impacted the subject property. • Five anomalies were identified during a geophysical survey conducted by Earth Dynamics on the subject property (Figure 2). Each anomaly appeared to be due to the presence of discrete buried objects. Based on historical information, Anomaly D located in the eastern portion of the subject property was identified as a possible heating oil UST. At the request of PDC, a limited geophysical survey of the subject property was conducted by Earth Dynamics using ground penetrating radar (GPR) and time-domain electromagnetic surveys. As part of the survey, GPR was used on the north side of the main building where a storm drainage plan from 2001 indicated that an Oil Tank Access point was located near the northwest corner of the gymnasium. The GPR survey identified a small anomaly; approximately 10 inches in diameter and approximately 18 inches below the sidewalk in this area, but the location did not correspond to the location of the former underground heating oil tank (HOT) based on available blueprints. Earth Dynamics interpreted the anomaly to be a buried piece of debris based on the size and shallow depth, and this area was not considered to be a recognized environmental condition. The purpose of the Phase II ESA was to evaluate the geophysical anomalies, and determine the presence or absence of contamination from the historic gasoline/service station to address the recognized environmental conditions identified in the Phase I ESA. In addition, while not a recognized 10/1/10 I:\PROJECTS\1095\006\020\FILERM\R\FINAL PHASE II ESA\PHASE II ESA_RPT_FINAL.DOCX LANDAU ASSOCIATES 1 environmental condition, PDC asked Landau Associates to advance subsurface borings in the vicinity of the former underground HOT on the north side of the building along SE Harold Street to document soil quality and assess possible impacts from the former underground HOT. The details of the field activities and the results of the sampling are discussed below. WORK PERFORMED The Phase II ESA was conducted by a Landau Associates representative and was completed over the course of two days; one day of test pit explorations and one day of shallow direct-push borings. Below is a summary of the field activities. Test Pits Landau Associates met a representative from C&W Grading at the project site to excavate test pits in the immediate vicinity of the geophysical anomalies (Figure 2) on August 4, 2010. A backhoe was used to excavate to the approximate depth of each anomaly. A summary of the geophysical anomalies, coordinates, and exploration findings can be found in Table 1. A photograph log of the anomalies and test pits has been included as Appendix A. All anomalies were explored and a test pit excavated with the exception of Anomaly C. Anomaly C was not explored for three reasons: 1) children were present on a playground in close proximity to the anomaly, thereby limiting access with an excavator, 2) there was a concern that excavation would damage the stormwater drainage system unnecessarily, and 3) upon closer inspection Anomaly C was determined to be a part of the stormwater drainage system from the roof of the Boys and Girls Club. Based on these observations, it was decided that Anomaly C’s function did not represent an environmental concern for the property. Observations from excavations from the other anomalies are discussed below. Anomaly A is located in the parking lot near the northeast corner of the former Lents little league concession stand was located, approximately 48 feet (ft) south of NE Harold Street, and 75 ft west of the Boys and Girls Club. Below the 4-inch layer of asphalt was an additional 6-inch layer of concrete. The test pit was excavated to a depth of approximately 4 ft below ground surface (BGS) exposing what appeared to be native sandy gravel. Earth Dynamics described the anomaly as approximately 1 ft BGS (Landau Associates 2010), which could have been attributed to rebar in the concrete found immediately beneath that asphalt. No evidence of an anomaly related to a recognized environmental condition was found. Samples were collected from the four side walls and bottom of the test pit and submitted to the lab to be held for composite and further analysis. PDC requested that these samples not be analyzed. Anomaly B is located near second base of the northern most baseball diamond, and approximately 100 ft southwest of the southwestern corner of the recreation center. A metal covered 10/1/10 I:\PROJECTS\1095\006\020\FILERM\R\FINAL PHASE II ESA\PHASE II ESA_RPT_FINAL.DOCX LANDAU ASSOCIATES 2 wooden fire door was found approximately 2.5 ft BGS amongst bricks, old mortar, and ash. Beneath the 3-ft by 7-ft door is a 10-inch layer of blue-colored ash. Below the ash is a concrete slab with 38-inch square scoring marks. Sample TP-B Ash was collected from the ash/soil mixture (predominantly ash) and submitted for polyaromatic hydrocarbons (PAHs), Resource Conservation and Recovery Act (RCRA) metals, and toxicity characteristic leaching procedure (TCLP) lead analyses. Anomaly D is located on the eastern property boundary (north of the southeast baseball diamond. A hollow metal surface was found 3 ft BGS. The metal surface was cleared to reveal a tank 8 ft long oriented north to south, 3.5 ft wide, and 3.5 ft deep. A fill port on the south end of the top of the tank was accessed and revealed the presence of approximately 6.5 inches of clear product in the tank with a strong petroleum odor resembling kerosene. No soil staining or odor was observed in the soil around the tank. A bent pipe on the north end of the top of the tank may have been the connective piping from the tank to a historic building. Samples TP-D North and TP-D South were collected from approximately 6 inches below the bottom of the tank on end, north and south respectively. Samples were submitted for total petroleum hydrocarbon (TPH) analysis by method NWTPH-HCID. Within the Anomaly D test pit a broken piece of iron pipe was found on the south side of the excavation. The pipe was approximately 3 ft long and did not appear to connect to the tank or anything beyond the edges of the test pit. The pipe was located approximately 3 ft BGS and oriented east to west. Anomaly E is located between first base and the pitcher’s mound of the southeast baseball diamond. The excavation started near first base and uncovered a 4-inch iron pipe approximately 2 ft BGS oriented west to southwest. The eastern end of the pipe is buried in concrete. To the west, approximately 15 ft from the beginning of the trench, the pipe connects to an 8-inch concrete pipe that extends to a depth of approximately 5 ft BGS. The pipe terminates at a dry well approximately 14 ft deep from its opening and is lined with red bricks (see photograph on page A-4 of Appendix A). A hand auger was used to collect a sediment sample from the bottom of the dry well with the consistency of soft, brown silt. The sample collected from the bottom of the dry well was submitted for RCRA metals and TPH-HCID analyses. Shallow Direct-Push Borings Five shallow direct-push borings were advanced to depths ranging between 13 and 15 ft BGS along the northern portion of the property boundary (Figure 2) on August 23, 2010. Drilling services were provided by Cascade Drilling LLP (Cascade Drilling) of Portland, Oregon.