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Shea Homes- Northern California Langston II <br /> 4943.009.007 Phase I Environmental Site Assessment <br /> TABLE 3.3.1.2-1 <br /> FACILITY Location DATABASES <br /> Tracy Maintenance Facility Mountain House Tracy, CA CPS-SLIC, HIST UST, CERS <br /> 95376 <br /> Proposed Mountain House High Mascot Boulevard/Central ENVIROSTOR, SCH <br /> School Parkway <br /> Proposed Julius Cordes 397 East Ramsey Drive ENVIROSTOR, SCH, CERS <br /> Elementary School <br /> Proposed Mountain House High Mascot Boulevard ENVIROSTOR, SCH <br /> School Neighborhood "D" <br /> Proposed Hansen Elementary 1185 Vecindad Street ENVIROSTOR, SCH <br /> School (Neighborhood C) <br /> Shell Central Valley Crude Oil Mountain House Parkway& CPS-SLIC <br /> Pipelines Grant Line Road <br /> Shea Homes—Neighborhood C 19855 West Grant Line Road VCP, DEED <br /> Tracy Maintenance Facility: In 2006 and 2007, about 165,000 cubic yards of soil contaminated <br /> with petroleum hydrocarbons from two former pipelines, which were removed from operation in <br /> the 1960s, were excavated from 25 areas of concern in Neighborhoods B, C, and D. The <br /> Department of Toxic Substances Control (DTSC) Schools Unit provided review comments for a <br /> portion of Neighborhood D that consisted of the high school parcel. Groundwater sampling was <br /> conducted in September 2009. No total petroleum hydrocarbons as crude oil (TPHc), TPH-diesel <br /> (TPHd), benzene, toluene, ethylbenzene, xylene(s) (BTEX), or naphthalene was detected in any <br /> of the groundwater samples. Maximum sulfur and sulfate concentrations included 78.8 milligrams <br /> per liter (mg/L) and 220 mg/L, respectively. The associated regulatory case has been closed. <br /> The Proposed Mountain House High School: This site was classified as No Further Action in <br /> 2009. <br /> The Proposed Julius Cordes Elementary School: This site, located at 397 East Ramsey Drive, <br /> was classified as No Further Action in 2018. <br /> The proposed Hansen Elementary School (Neighborhood C): This site, located at 1185 Vecindad <br /> Street, was classified as No Further action in 2016. <br /> Shell Central Valley Crude Oil Pipelines: In 2006 and 2007, about 165,000 cubic yards of soil <br /> contaminated with petroleum hydrocarbons from two former pipelines, which were removed from <br /> operation in the 1960s, were excavated from 25 areas of concern in Neighborhoods B, C, and D. <br /> Residual hydrocarbons remained in soil after the remediation; however, the RWQCB concluded <br /> the remaining petroleum impact does not pose a threat to human health, the environment, or the <br /> waters of the State. No Further Action status was granted in November 2011. <br /> Shea Homes — Neighborhood C: This site, located in the southwestern portion of Neighborhood <br /> C, is listed as certified. It has undergone cleanup activities in accordance with the Removal Action <br /> Work Plan (RAW). Our review of available documents found that the soil was impacted with <br /> dieldrin, a persistent organochlorine pesticide. The horizontal and vertical extent of impacted soil <br /> was determined through confirmation sampling and laboratory testing. In accordance with the <br /> RAW, impacted soil was excavated and encapsulated within Great Valley Parkway. The <br /> Department of Toxic Substances Control (DTSC) issued a letter on September 13, 2017, <br /> certifying the remedial action was completed at the site. <br /> ENGEOJuly 2, 2020 <br /> Expect Excellence- <br />