Report to Mayor and City Council
Tuesday, July 18, 2023
Consent
SUBJECT:
Title
CONSIDER APPROVAL OF AMENDMENT NO. 1 TO LEIGHTON CONSULTING, INC. AGREEMENT TO PROVIDE SUPPLEMENTAL PHASE II ENVIRONMENTAL STUDY FOR CARRIAGE CREST PARK EXPANSION PROJECT NO. 1368.
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I. SUMMARY
In October 2022, the City entered into an agreement with Leighton Consulting, Inc. (Leighton) to conduct a Phase II Environmental Site Assessment (ESA) of the newly leased 10 acre site (Site) adjacent to the east of Carriage Crest Park. After completion of the ESA, it was determined the Site contains OCP-soil contaminates. Leighton subsequently recommended a Supplemental ESA to determine the limits of the contaminated soil required for disposal.
Staff recommends City council approve Amendment No. 1 to the agreement with Leighton Consulting Inc for supplemental Phase II ESA testing and increasing the contract sum by $28,200 for a total contract sum of $52,050.
II. RECOMMENDATION
Recommendation
TAKE the following actions:
1. APPROVE Amendment No. 1 with Leighton Consulting, Inc. for supplemental Phase II Environmental Site Assessment, increasing the contract sum by $28,200 for a total contract sum of $52,050.
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2. AUTHORIZE the Mayor to execute the contract amendment, following approval as to form by the City Attorney.
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III. ALTERNATIVES
TAKE another action the City Council deems appropriate consistent with the requirements of the Law.
IV. BACKGROUND
Recently, the City of Carson leased the land located at 321 W. Sepulveda Boulevard with the intention of expanding Carriage Crest Park. The Site was owned by the Los Angeles County Sanitation District (LACSD) and last leased to Color Spot Nurseries which vacated the Site in December 2018. Staff determined it necessary to conduct environmental tests on the site prior to any construction or renovation efforts. A previously conducted Phase I ESA indicated the Site was used for agricultural/nursery purposes since the 1920s. The Phase I ESA also identified use of pesticides, herbicides, and other elements were applied at this agricultural site.
On October 31, 2022, staff entered into an agreement, under the City Manager’s authority, with Leighton Consulting Inc to conduct a Phase II ESA at the newly leased Site for a contract amount of $23,850 (Exhibit No. 1). The Phase II ESA was conducted to assess potential soil contamination at the Site. Forty-six soil samples were submitted to the Advanced Technology Laboratories. The samples were analyzed for Organochlorine pesticides (OCPs), Title 22 Metals, Arsenic, Total Petroleum Hydrocarbons (TPH), Organophosphorus pesticides (OPPs), and Chlorinated herbicides (CHs). The lab results of these samples did not exceed the regulatory health screening criteria except for OCPs. As a result of the Phase II ESA findings, it is recommended this soil be removed and disposed to an appropriate landfill.
Leighton recommends a supplemental assessment in the area of concern to determine the limits and volume of the OCP-contaminated soil required for disposal (Exhibit No. 2). Staff deemed the negotiated fee to be proportionate to the tasks by Leighton to accomplish the aforementioned supplemental assessment.
Staff recommends amending the agreement with Leighton, increasing the contract sum by $28,200 for a total contract sum of $52,050 (Exhibit No. 3).
V. FISCAL IMPACT
None. Funds for the proposed amendment are available in the FY 2023-24 Prop 68 Fund account 268-80-820-904-8008.
VI. EXHIBITS
1. Original Contract (pgs. 3-39)
2. Supplemental ESA Scope of Work (pgs. 40-45)
3. Contract Amendment No. 1 (pgs. 46-58)
Prepared by: Raymond Velasco, P.E, Public Works Operations Manager