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Site History and Summary of Previous Environmental Investigations Q Former ARCO Service Station No. 559 Updated July 2, 2021 anteaRgraup SITE HISTORY AND SUMMARY OF PREVIOUS ENVIRONMENTAL INVESTIGATIONS The Central Valley Regional Water Quality Control Board (Central Valley Water Board) issued a Request for Environmental Assessment to the owners of Buggy Bath Car Wash located at 2085 East Main Street, Stockton, California, Assessor Parcel Number (APN) 153-102-100-000 (the Site) on February 11, 2019. An adjacent American Medical Response West (AMRW) UST case (Central Valley Water Board Case Number 392001; Global ID Number T10000008942) is located at 2060 East Main Street in Stockton, California (southeast of the Site).The active leaking underground storage tank(LUST) cleanup site is currently an ambulance medical response fleet facility operating as AMRW.This property was historically a gasoline retail fueling facility with an unknown number of USTs.The Monitoring Well Installation Report dated April 27, 2017 by Advanced Geo Environmental on behalf of AMWR details the installation of three monitoring wells in February and March 2017. One of these wells was installed in the sidewalk along the eastern edge of the Buggy Bath Car Wash property (MW- 3), and two wells were installed south of East Main Street(MW-1 and MW-2). Groundwater samples from MW-3 contained petroleum hydrocarbons significantly above Water Quality Objectives.The Central Valley Water Board concluded that these petroleum hydrocarbons have originated from the Buggy Bath Car Wash property. Former ARCO Station No. 559 is now an active LUST Cleanup Site under Central Valley Water Board Case Number 392006 and Global ID Number T10000012224.The Site is located on the northwest corner at the intersection of East Main Street and C Street in Stockton, California.An active, self-serve car wash with two vacuum stations and four car wash ports currently operates at the Site. A mix of commercial and residential properties surrounds the Site. Background information for the Site was gathered using historical aerial photographs, Sanborn fire insurance maps, and sensitive receptor information provided by Environmental Data Resources, Inc.The Site served as a fueling facility from approximately 1940 to 1965, as identified in the EDR report. Additional historical building permits from the City of Stockton were located by the Central Valley Water Board as documented in a letter dated March 27, 2019, on the State Water Resource Control Board (SWRCB) GeoTracker website.The letter states that ARCO owned and operated a commercial fueling facility at the Site from 1952 to 1973. A Sanborn fire insurance map from 1950 shows a general layout of the former oil and gas service station, but the exact location and number of the USTs is unknown. In the 1968 aerial, the property appears to be vacant with no structures present.The City of Stockton issued a building permit for the car wash on May 13, 1974.The aerials from 1975 through 2016 generally depict the current Site structures. Antea Group submitted the Work Plan for Monitoring Well Installations to the Central Valley Water Board on August 8, 2019.The approved scope included installing five groundwater monitoring wells, each to approximately 50 feet below ground surface (bgs) located on and off the Site property. On January 21, 2020 the Central Valley Water Board joined Antea Group at the Site and conducted a split groundwater sampling event.The Central Valley Water Board observed Antea Group gauging, purging, and sampling wells MW-1, MW-2, and MW-4.After half of the samples were collected at each respective well by Antea Group field staff,the Central Valley Water Board field staff collected a set of samples at each well, followed by Antea Group collecting the second half of their sample collection. Results from the Central Valley Water Board sampling are presented in a letter dated February 10, 2020.