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Surface and Subsurface Contamination Report Irerracon Sandhu Property Mountain House, California August 12, 2021 Terracon Project No. NA217037 Historically, the site was utilized for row crops from at least 1937 through 2006, which may have included the use of pesticides and herbicides. Most currently used agricultural chemicals do not persist for extended periods of time in the environment if applied appropriately; however, some agricultural chemicals persist in the environment, especially if misapplied. In Terracon's experience, the application of herbicides and pesticides to agricultural fields can leave trace amounts of the compounds in the soil and/or groundwater, that may accumulate overtime due to long-term applications. The pipeline identified on the site and northern and eastern adjoining properties is further discussed below in Sections 3. 1.1 and 3.1.2. The activity identified on the southern portion of the eastern adjoining property appears to be associated with an oil spill associated with the crude oil pipeline and is further discussed below in Section 3.1.1. Terracon's ability to interpret the land uses is limited by the scale and quality of the images. Copies of the historic information are included in Appendix C. 2.3 Interviews An attempt was made to obtain historical as well as current information relative to the site from the property owner or key site manager of the property. An Environmental Questionnaire and Disclosure Statement were completed by Mr. Dan Schack, User of the SSCR, and Mr. Karnail Sandhu, Owner. Based on a review of Mr. Schack's responses, the purpose of the SSCR is to divide APN 209-060-49 into one 16 -acre parcel and one 16.92 -acre parcel to be developed with commercial and multi -tenant residential properties. The parcel boundaries for APN 209-060-60 are proposed to be re -aligned into two parcels of unknown size to be developed with a roadway, utility easement, and/or remain as vacant land. Mr. Schack was not aware of any environmental liens or land use limitations recorded against the property. He stated that he did not have any specialized knowledge or experience relating to on-site environmental conditions. Mr. Sandhu indicated that he was not aware of the site or adjoining properties historically operating as gasoline stations, motor repair, commercial printing, dry cleaning, photo developing, junkyard, landfill, or waste treatment, storage, disposal, processing, or recycling facilities. Additionally, he was not aware of current or historical environmental liens, violations of environmental laws, existence of hazardous substances or petroleum products, transformers, solid or liquid waste generation, building structures, chemical storage tanks, industrial operations, or agricultural operations associated with the site. Mr. Sandhu and Mr. Schack did not provide information relating to former site owners. A copy of the responses has been included in this report as Appendix C. Responsive ■ Resourceful ■ Reliable 4