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SITE HEALTH AND SAFETY PLAN(HASP)-FORM 1 Prepared by:Brian P.Reilly TDD Number: Date: February 2019 0006/1302-T6-R9-18-01-0002 Work Order numbers: 20409.012.006.0183.00 Non-Field Labor 20409.013.006.0183.00 Non-Level A Field Labor Project Identification Site History: Office: Walnut Creek(WCA) The U.S. Environmental Protection Agency (EPA) Region 9 is conducting a Targete Brownfields Assessment(TBA)Phase I/II Investigation for the for the non-profit organizatio Site Name: Stockton—S Airport Way-2135- Stocktonians Taking Action to Neutralize Drugs(STAND)at a single vacant property(th Phase I/II TBA Site)in Stockton,San Joaquin County,California. Client: US EPA Work Location Addresses: 2135 S.Airport Way The Site is currently owned by the City of Stockton,which acquired the property at some poin Stockton,CA between 1969 and 1980.The Site was owned by the Humble Oil Company(a predecessor o ExxonMobil)by at least 1969 and by the Petroleum Products Co.in at least 1960 and 1961 The Site is currently vacant and the surface is covered by exposed soil and low vegetation(e.g. grasses).The only existing on-site structure is a sign that is located at the northeastern corne of the property.The western boundary of the Site is bordered by a masonry wall;the remainin borders of the site are not fenced. Historical records indicate that the Site was formerly occupied by one or more service stations The site appears to have been developed between 1940 and 1957 as the"Red D Station"servic station, which had the address of 2141 Sharps Lane (renamed as South Airport Way i approximately the late 1950s). Between 1957 and 1961, the original service station wa demolished and replaced with a new service station, identified as "Mel's Enco"(2141 S Airport Way). This second service station was demolished around 1969. A linear structur existed at the southwestern portion of the Site until at least 1998.This structure appears to hav been a relatively large`billboard'sign,which was removed under permit in 2001.No additiona structures are known to have existed at the Site since the late 1960s. The site encompasses approximately 0.40 acre in a mixed commercial and residential area an comprises a single 0.33-acre parcel,identified as San Joaquin County APN 169-077-03, well as portions of adjacent municipal rights-of-way (Figure 2, Appendix A). The site i bordered to the north by vacant land;to the east,across South Airport Way,by a convenient store(South Side Market)(formerly Ralph Square);to the south,across East 8th Street,b vacant land;and to the west,across Ophir Street,by three single-family residential buildings. The Site is currently vacant and the surface is covered in exposed soil and low vegetation(e.g. grasses). The western boundary of the Site is bordered by a masonry wall;the remainin borders of the site are not fenced.A geophysical survey of the property was conducted b WESTON on May 19,2018.No significant anomalies were identified during the survey tha would indicate the presence of an existing underground storage tank(UST)on site. At the northern portion of the Site, an east-west trending lineation was identified at a depth o approximately 3 feet(ft)and a north-south trending lineation at a depth of approximately 1. ft.Based on the relative locations of these Iineations with respect to former on-site structures the lineations are most likely associated with historical utility subsurface conduits. Scope of Work: To evaluate environmental concerns from contaminants potentially impacting soil at the Site,composite surface and subsurface soil samples,discrete subsurface soil samples,and soil vapor samples will be collected.WESTON previously conducted a private utility survey of the Site in May 2018 and will notify a one-call utility service(i.e.,"dig-alert")at least 72-hours prior to sampling activities. The Site has been divided into 12 decision units(DUs)for the purposes of assessing the property. One 4-point composite surface soil sample will be collected from each of the 12 DUs across the Site and will be analyzed for lead.One 4-point composite shallow subsurface(approximately 2 ft bgs)soil sample will be collected from each of the 12 DUs across the Site(to be colocated with the surface soil samples) and will be analyzed for lead. Three soil borings will be advanced across the site to a total depth of approximately 20 ft bgs using direct-push methodology. Soil will be screened for organic vapors using a photo-ionization detector (PID) at 4-ft intervals. Soil samples with elevated organic vapors (as measured with the PID) and/or samples collected from approximately 10 and 20 ft bgs will be analyzed for lead, TPH-g,TPH-d, TPH-mo,PAHs, and VOCs. Soil vapor borings will be installed using direct push methodology at five, approximately evenly-spaced locations across the Site to a total depth of approximately 20 ft bgs.Soil will be screened for organic vapors using a PID at 4-ft intervals and soil samples may be submitted for analysis if elevated levels of organic vapors are encountered. At each boring, soil vapor probes will be installed at two selected depths(dependent on lithology)targeted for 5-7 ft bgs and 10-15 ft bgs. Soil vapor samples will be analyzed by VOCs/TPH-g via EPA Method TO-15 and for TPH-d via EPA Method TO-17(orequivalent). 1 of 23