SR0084588_SSCRPT - Laserfiche WebLink

Home Browse Search

Map Key Number of Direction Distance Elev/Diff Site DB Records (mi/ft) (ft) Potential Media Affected: NO MEDIA AFFECTED, SOIL, SOIL VAPOR Potential Contamin of Concern: BENZENE METALS ORGANOCHLORINE PESTICIDES (8081 OCPS) TPH-DIESEL SITE HISTORY. The Lammersville Unified School District (District) is proposing to construct the Kindergarten through 8 -grade Julius Cordes Elementary School at 397 East Ramsey Drive, Mountain House, San Joaquin County, California (Site). The approximately 16 -acre Site is designated by the San Joaquin County Assessor's Office as Assessor's Parcel Number 209-450-38. At capacity, the proposed school will accommodate up to 33 classrooms and 775 students. Water and sewer services will be provided by the local municipality servicing the City of Mountain House. According to the Preliminary Environmental Assessment (PEA) Report, the Site was used for agricultural purposes from the 1930s through 2015. Based on aerial photographs from 1937 through the present, no structures appear to have been located on the Site. In the early 1900's, the Shell Oil Corporation (Shell) operated twin crude oil pipelines that transected the neighborhood more than 400 feet southwest of the Site. The pipelines were partially removed during the 1960s. The pipelines leaked in certain areas, releasing petroleum hydrocarbons (crude oil and diesel -range hydrocarbons) into soil and groundwater. Shell conducted extensive remediation of contaminated soil, and in 2011 the Central Valley Regional Water Quality Control Board issued a No Further Action determination. The Site is currently undeveloped, with surrounding areas being graded for residential development. The Site is bordered to the north by future residential development (Neighborhood D), Mountain House Fire Station Number 1, and Mountain House High School (to the northwest); to the east by future residential development (Neighborhood D) followed by Prosperity Street and more residential subdivision developments; to the south by East Ramsey Drive followed by residential developments; and to the west by South Tradition Street, residential development, followed by South Central Parkway and residential subdivisions. The PEA investigated the Site for potential impacts from the following environmental conditions that may pose a threat to human health or the environment: • Organochlorine pesticides, arsenic and lead in soil from potential former application of agricultural chemicals; and • Volatile organic compounds (VOCs) and Semi -VOCs in soil vapors potentially associated with the reported former Shell pipeline releases. The PEA Report stated that based on the soil analytical data, arsenic and lead were detected in all analyzed samples. Lead concentrations range from 7.8 milligrams per kilogram (mg/kg) to 9.6 mg/kg which is below the DTSC screening level of 80 mg/kg. Arsenic concentrations range from 4.1 mg/kg to 4.8 mg/kg. All arsenic sample results are below the arsenic background range for the Mountain House area, which ranges from 6.6 mg/kg to 9.3 mg/kg based on the arsenic background data set collected during the Neighborhood E School PEA investigation (DISC Project Code 104319, Envirostor database number 39010035). The Neighborhood E School is located approximately 1.5 -miles north of the Site and is reported to be within the same or similar geologic unit. The results of the PEA screening level risk assessment calculated that the total risk from COPCs identified in soil gas is estimated to be 6.96E-08; which does not provide an increased cancer risk of greater than 1 in 1,000,000 (>10-6). The cumulative hazard quotient is estimated to be 0.00233; which does not provide a significant health hazard (>1). The PEA Report recommends no further action and requests DTSC's approval of the Site for development as a school. Based on review of the PEA Report, neither a release of hazardous material nor the presence of a naturally occurring hazardous substance which would pose a threat to public health or the environment under unrestricted land use was indicated at the Site. Therefore, DTSC concurs with the conclusion of the PEA Report that further environmental investigation of the Site is not required and hereby approves the PEA Report. The school design is in the final stages of State approval with the Department of School Architecture for the District's eighth K-8 school, Julius Cordes Elementary School. The District's hope is that the design approval and the funding of the project will lead to breaking ground in the early part of 2019,- with 019;with the goal to open Julius Cordes Elementary School in August of 2020. LAST UPDATED DEC 26. 2018 Status: NO FURTHER ACTION Program Type: SCHOOL EVALUATION CalEnviroScreen Score: 76-80% Summary Link: https://www.envirostor.dtsc.ca.gov/public/profile_report?global_id=60002603 ComD/eted Activities Title: PEA WORKPLAN: Lammersville USD, Proposed Julius Cordes ES - Neighborhood D (104775) Title Link: https://www,envirostor.dtsc.ca.gov/public/final_documents2?giobal_id=60002603&doc_id=60441339 Area Name: Area Link: Sub Area: Sub Area Link: erisinfo.com I Environmental Risk Information Services Order No: 21080200152