ARCHIVED REPORTS_2018 REV SITE INV WK PLAN+

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Brusca File No. 137-002 Page 2 May 7, 2018 DRAFT Murphy Parkway Property Waste Materials Reuse Workplan 2018 to slightly revise the verification soil sampling program (testing of soils beneath the area of removed wastes) as suggested by the Central Valley Regional Water Quality Control Board (CVRWQCB).3 This Draft Workplan includes: a general description of the site; background information; a description of the planned site development; information, laboratory data and discussion pertaining to stockpiled materials generated during the recent removal of solid waste materials from WU1; justification for onsite reuse of materials excavated from WU1; procedures for the reuse of these materials in onsite engineered fills; and verification/reporting procedures to ensure that the materials are reused in the manner described herein. A Vicinity Map showing the location of the subject parcel is presented as Plate 1. A Site Map is presented as Plate 2 showing the layout of the entire parcel, the former area of capped wastes (WU1) on the far northwesterly portion of the site, the locations of stockpiled materials that were recently excavated and removed from the capped waste area, and the general layout of the planned large commercial/light-industrial building on the property. A detail map showing WU1 area and the locations of verification soil samples collected beneath the area of removed wastes is presented as Plate 3. A civil engineering drawing depicting additional details pertaining to the planned construction is presented as Plate 4. Analytical laboratory data for samples of the stockpiled materials from WU1, as well as for the verification soil samples collected beneath WU1, are presented on Tables I through VII; the laboratory reports and chain-of-custody documentation are included in Appendix A. The Foundation Investigation (geotechnical engineering report) for the site development project is presented in Appendix B. SITE DESCRIPTION AND BACKGROUND Site Location and Description The approximate 48-acre subject property is located about 500 feet easterly of Murphy Parkway and about 1,000 feet northerly of D’Arcy Parkway in a commercial and industrial area of Lathrop, San Joaquin County, California. The property consists of an approximate 48-acre parcel identified as APN 198-012-009. The subject parcel is currently vacant/undeveloped land. The site is generally flat; however, two depressed areas are situated on the northwesterly portion of the site (bordering the WU1 area). Until recently, portions of the site were used for livestock grazing; wire fencing is in place on portions of the site for livestock enclosure purposes. A Vicinity Map showing the location of the property is presented as Plate 1, and a Site Map is presented as Plate 2. Historical Site Activities The 48-acre subject parcel historically was vacant farmland. In the early 1960s, a large glass manufacturing facility (currently referred to as former Pilkington North America [PNA] facility) was constructed directly northerly of the subject property. The subject 48-acre parcel (identified by APN 198-012-009) was associated with the former PNA facility, and, along with other offsite areas, was used for solid waste handling and waste water disposal related to the PNA facility. 3 Brusca Associates, Inc.; “Addendum, Excavation and Material Management Plan, Murphy Parkway Property, APN 198-012-009, 17100 Murphy Parkway, Lathrop, San Joaquin County, California”; March 22, 2018.