ARCHIVED REPORTS_2019 SOIL MGMT PLAN (MAY)

Home Browse Search

Brusea File No. 137-002 Page 4 March 9, 2018 Murphy Parkway Property Excavation and Materials Management Plan • a significant number of explorations (test pits and borings) within the capped area and other site areas, including areas to the south and east of the capped area. • a geophysical survey (involving ground penetrating radar and a magnetometer survey) on the westerly portion of the property to identify any unknown areas of disturbed materials/buried wastes. The geophysical work reportedly identified two areas (approximate 2,000 square feet each in plan area) of deeper disturbed materials/wastes along the far westerly margin of the property and outside of the cap area. These waste materials subsequently were completely excavated and removed from the parcel for offsite landfill disposal. • collection of a substantial number of samples of soil and waste materials from the capped area of the site, the area of removed wastes, and other site areas for analytical laboratory testing. It is reported that the laboratory testing did not reveal significant chemical contaminant concerns associated with remaining solid wastes at the site (i.e. the thin layer of capped wastes on the northwesterly portion of the site). AGE's investigative, remedial, and characterization work associated with solid wastes on the subject parcel was summarized in a Site Assessment Summary Report dated December 21, 2017.2 As a part of AGE's work, the results of exploratory excavations were evaluated to define the limits of residual/capped wastes at the property; site maps and trench logs with such results are appended. Based on the results, AGE estimated that the total volume of residual waste glass in the capped area at the site is on the order of 1,500 cubic yards and determined that the lateral and vertical extent of such wastes was defined. 5.0 PLANNED CONSTRUCTION ACTIVITIES Redevelopment of the subject property is planned to be initiated in the very near future. The planned development includes construction of an approximate 870,000 square -foot commercial/light-industrial structure intended for use for warehouse/distribution purposes. The layout of the planned development is shown on Plate 3. The planned structure will be of tilt -up concrete construction with a concrete slab -on -grade floor. Onsite areas exterior to the building will support asphaltic -concrete and/or concrete pavements, storm water basins, and very limited landscaping. Project earthwork construction/grading will involve the disturbance, redistribution, and grading of soils across essentially the entire 48 -acre subject parcel, including the capped area on the northwesterly portion of the site. As described in this EMMP, the capped wastes known to exist beneath the far northwesterly portion of the parcel will be completely removed and evaluated for onsite reuse prior to construction in this area. z AGE; "Revised Site Assessment Summary Report, 17100 Murphy Parkway, Lathrop, San Joaquin County, California, Solid Waste Information System (SWIS) Number 39 -CR -022 (APN 198-120-09); January 10, 2018. BruscaAssociates.com • P.O. Box 332, Roseville, CA 95661 9 Phone (916) 677-1470