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PHASE H ENVIRONMENTAL SITE ASSESSMENT REPORT SATELLITE APARTMENTS APN 139-224-090 530 N. STANISLAUS STREET STOCKTON, SAN JOAQUIN COUNTY, CALIFORNIA May 31,2024 1.0 INTRODUCTION Condor Earth(Condor)conducted a Phase II Environmental Site Assessment(ESA)for the property located at 530 N. Stanislaus Street in Stockton,San Joaquin County,California(Figures 1 and 2,Appendix A).The evaluated property (Site) is designated as Assessor Parcel Number (APN) 139-224-090 and totals 0.55 acres. This Phase II ESA investigation included soil gas sampling to evaluate whether historical use of adjoining properties as autobody repair shops from the 1950s until present, and a dry-cleaning operation from the 1930s to 1955,resulted in contamination beneath the Site.Additionally,this investigation included the sampling of surface soils around the existing Site apartment complex to evaluate whether historical application of termiticides resulted in organochlorinated pesticide impacts to surface soil. Site soil gas samples were screened for the presence of volatile organic compounds (VOCs), and soil samples were screened for the presence of chlorinated pesticides (OCPs). Condor conducted the Phase 11 ESA under contract with Housing Authority of the County of San Joaquin(Client). 2.0 SITE BACKGROUND The 0.55-acre Site includes an approximate 12,600 square foot (sqft) two-story residential apartment complex and a parking lot.Review of historical documents indicates that the Site was originally developed as primarily residential on at least four separate parcels. Site properties were combined in 1963, at which point the two-story apartment building and a paved parking lot replaced the residential development. The adjoining properties are primarily residential and commercial. Condor identified at least five high-risk off- Site properties including automotive repair and dry-cleaning operations that are in close proximity to the Site. Several auto body repair facilities were identified on the eastern adjoining block since at least 1950 to present; a printing operation was identified on the northeast adjoining property from at least 1975 to 1990; and a historic dry-cleaning operation was identified on the southern portion of the northern adjoining block from at least 1930 to 1955. Due to the likelihood of chlorinated solvent and petroleum products use at the nearby properties, a vapor encroachment condition could not be ruled out for the Site without further investigation. Additionally, soil around the building perimeter may be impacted by chlorinated pesticides from historical termiticide application. Groundwater beneath the Site is anticipated to range from approximately 15 to 18 feet below ground surface(bgs) and flows toward the east-northeast. lk4414- �,i CONDOR