COMPLIANCE INFO - Laserfiche WebLink

Home Browse Search

' �pU Yf9 # i :J r Page 2 San Joaquin County November 6, 2008 Project Number 99008-008321.03 • Southeast Adjoining Filling Station (16 East Harding Way)—The southeast adjoining and crossgradient filling station has been present since 1955 and had a release of gasoline impacting groundwater and is currently being monitored and undergoing remediation for TPH-g, benzene, methyl-tert butyl ether(MTBE), and 1,2-DCA. Although no investigations have been conducted on the subject property, it appears that the subject property groundwater may be impacted with 1,2- dichloroethane (DCA), based on the most recent groundwater monitoring results collected in January 2008. The closest wells to the subject property, MW-3A(approximately 135 feet southeast of the subject property) and MW-7A(approximately 160 feet east of the subject property), detected 1.4 micrograms per liter(ug/L) and 1.8 ug/L of 1,2-DCA, respectively, which exceeds the Regional Water Quality Control Board Environmental Screening Level of 0.5 ug/L. TPH-g was also detected in MW- 7A at 97 ug/L; MTBE and benzene were not detected in those two wells in 2008. Based upon available information, the release associated with the southeast adjoining property is a REC. • Southwestern and Upgradient Adjoining Dry Cleaner(48 West Harding Way)—Cannon Cleaners has been located approximately 100 feet southwest(upgradient) of the subject property since approximately 1960 and was previously located at 130 West Harding Way(approximately 150 feet upgradient)from approximately 1940 to 1955. The presence of the southwest adjoining dry cleaner is a REC based on its lengthy history and close upgradient proximity to the subject property. • Historic Nearby Properties—Several filling stations and dry cleaners were adjacent or nearby the subject property during various time since 1935. These properties included a filling station located south of the subject property at 10 West Harding Way from 1965 to 1979, southwest of the subject property at 140 West Harding Way from 1930 to 1970, west of the subject property at 105 West Harding Way in 1935, and 101 West Harding Way in 1940. A filling station has also been identified southeast of the subject property at 16 East Harding Way since 1955 as detailed above. A filling/service station was identified east of the subject property from 1955 through 1984 at 45 East Harding Way. A dry cleaner was located at 34 East Harding Way in 1940, and Cannon Cleaners (noted above)was located at various locations upgradient of the subject property since 1940 to present. These facilities are RECs based on the close proximity and lengthy time period they have been located adjacent or nearby the subject property. Based on the above information, Bureau Veritas recommended an LSI be performed at the subject property to assess the potential for impact from the RECs to include the collection and analysis of soil, soil vapor and/or groundwater samples for laboratory analysis of appropriate indicator parameters. OBJECTIVES The subsurface investigation will be performed relative to the proposed occupation of the subject property. Bureau Veritas understands that Walgreen will renovate the existing structure and lease the Site. The subsurface investigation will be conducted to evaluate the potential for vapor intrusion from potential groundwater impacts beneath the Site and evaluate historic on-site service station. Descriptions of the scope of work, schedule, fees, and miscellaneous information are presented in the following sections. SCOPE OF WORK The proposed scope of work will consist of the following tasks: • Task 1: Conduct pre-field activities including submitting a workplan and obtaining required drilling permits SAMPROJECTS\3-Chicago[99](15-16)\Walgreen Repo rts\99008-008321.01 Stockton\P2\Workplan.doc