Environmental Hazards

DEED RESTRICTION

The Burdened Property contains hazardous materials in soil, soil gas and groundwater. A significant portion of the contaminated soil will be removed, profiled and disposed of at permitted landfills. Soil and groundwater remaining at the property below the foundation members might include chemicals, including Total Petroleum Hydrocarbons as Gasoline, Diesel, Motor Oil and their Aromatic components, Ethylbenzene, Toluene, and Xylene(s), and Halogenated Solvents and certain Heavy Metals, which constitute hazardous materials as that term is defined in California Health & Safety Code Section 25260(d). The owners agree to record in the Official Record of the City of San Francisco in order to give all future owners notice of the requirements herein.

excerpts from: SUBSURFACE SOIL AND SOIL GAS INVESTIGATION REPORT

documents available from Department of Health Maher Ordinance mitigation of hazardous substances for 1458 San Bruno, 1499 Potrero Ave Link1, Link2

...engineering controls would have to be installed beneath the buildings at the Site as a protective measure to reduce potential long-term risks to human health related to constituents of concern (HVOCs)... These measures will be installed to prevent migration of HVOC compounds in soil vapor from entering enclosed on- site building where occupants could be exposed through inhalation of deleterious vapor chemical constituents.

The excavated soil would have to be assessed, profiled, characterized and classified in regards to its hazard class as either Class II contaminated soil or California Hazardous Waste soil.

As a result of the findings a Health and Safety, Dust Control and Air Monitoring Plans (AMP) are required...Workers in contact with the soil must wear appropriate Personal Protective Equipment...A Site health and safety officer (HASO) should be on-site at all times during excavation activities to ensure that all health and safety measures are maintained.

• every PCE sample in 10 out of 11 exceeded Sub Slab/Soil Gas Vapor Intrusion: Human Health Risk Levels (Table SG-1) Residential Cancer Risk

• Groundwater has been shown to be impacted with heavy metals, petroleum hydrocarbon related compounds TPH-g, TPH-d and TPH-mo and certain VOCs

• The results of the current investigation indicated areas where total and soluble lead detected in fill have exceeded California hazardous waste criteria.

• the investigation indicated the presence of Total Petroleum Hydrocarbons (TPHs) as TPH-g, TPH-d and TPH-mo in both soil and groundwater samples; VOCs in soil and groundwater, Total Heavy metals in both soil and groundwater samples, and to a lesser extent Dissolved Heavy Metals in groundwater and soil Vapor Intrusion

• the investigation indicated the presence of TPHg, TPH-d and TPH-mo in both soil and groundwater samples, VOCs in groundwater, Total Heavy metals in both soil and groundwater samples, and to a lesser extent Dissolved Heavy Metals in groundwater;

• Presence of hazardous waste Lead concentrations and petroleum products in surficial soil

• The investigation did indicate the presence of hazardous waste Total Lead down to 5 ft bgs and significant presence of California Soluble Hazardous Waste (STLC)

• Presence of substantial halogenated solvents (HVOCs), limited to PCE, TCE, Cis and Trans 1,2,-DCE and Vinyl Chloride (VC) in groundwater, and linked soil vapor samples

TPHs as Diesel (TPH-d) were detected in soil samples at concentrations ranging from ND<5 milligrams per Kilogram (mg/Kg) to 1,000 mg/Kg.

TPHs as motor oil (TPH-mo) were detected in the soil samples at concentrations ranging from ND<5 mg/Kg to 1,400 mg/Kg.

TPHs as gasoline (TPH-g) were detected (ND) in samples at the site from ND to 190,000 ug/l

TPHs as Diesel (TPH-d) were detected in groundwater samples at concentrations ranging from 87 ug/l to 10,000 ug/l.

TPHs as motor oil (TPH-mo) were detected in groundwater samples at concentrations ranging from ND to 28,000 ug/l ug/l.

Antimony was detected in soil samples at concentrations ranging from ND to 2.5 mg/kg.

Arsenic was detected in the soil samples at concentrations ranging from ND to 12 mg/kg.

Barium was detected in soil samples at concentrations ranging from ND to 690 mg/kg.

Beryllium was detected in soil samples at concentrations ranging from ND to 0.62 mg/kg.

Cadmium was detected in soil samples at concentrations ranging from ND to 4 mg/kg.

Chromium was detected at concentrations ranging from 54 mg/Kg to 300 mg/Kg.

Cobalt was detected at concentrations ranging from 4.6 mg/kg to 35 mg/Kg.

Copper was detected at concentrations ranging from 15 mg/Kg to 260 mg/Kg.

Lead was detected at concentrations ranging from 3.8 mg/Kg to 680 mg/Kg.

Mercury was detected at concentrations ranging from ND mg/Kg to 0.45 mg/Kg

Molybdenum was detected at concentrations ranging from ND mg/Kg to 1.5 mg/Kg

Nickel was detected at concentrations ranging from 24 mg/kg to 260 mg/Kg.

Silver was detected at concentrations ranging from ND mg/Kg to 24 mg/Kg

Vanadium was detected at concentrations ranging from 43 mg/Kg to 130 mg/Kg

Zinc was detected at concentrations ranging from 26 mg/Kg to 1,000 mg/kg

Arsenic was detected in dissolved groundwater samples at 7.4 ug/l to 12 ug/l

Barium was detected in dissolved groundwater samples at 360 ug/l to 640 ug/l

Cobalt was detected in dissolved groundwater samples from 8.1 ug/l to 18 ug/l

Molybdenum was detected in dissolved groundwater samples from ND to 120 ug/l

Nickel was detected in dissolved groundwater samples from 11 ug/l to 24 ug/l

Vanadium was detected in dissolved groundwater samples from ND ug/l to 7.8 ug/l

Arsenic was detected in Total groundwater samples at ND to 170 ug/l

Barium was detected in Total groundwater samples at 62 ug/l to 19,000 ug/l

Cadmium was detected in Total groundwater samples from ND to 240 ug/l

Chromium was detected in Total groundwater samples from 310 ug/l to 2,800 ug/l

Cobalt was detected in Total groundwater samples from 240 ug/l to 2,300 ug/l

Copper was detected in Total groundwater samples from 1,100 ug/l to 33,000 ug/l

Lead was detected in Total groundwater samples from 300 ug/l to 26,000 ug/l

Mercury detected in Total groundwater samples from ND to 160 ug/l

Nickel was detected in Total groundwater samples 810 ug/l to 11,000 ug/l

Silver was detected in was detected in Total groundwater samples from ND to 19 ug/l

Vanadium was detected in Total groundwater samples from 360 ug/l to 2,200 ug/l

Zinc was detected in Total groundwater samples ND to 27,000 ug/l

Toluene was detected in groundwater samples at concentrations ranging from ND to 34,000 ug/l.

Acetone was detected in groundwater samples at concentrations ranging from ND to 660,00 ug/l.

Cis-1,2 Dichloroethene was detected in groundwater samples at concentrations ranging from ND to 25,000 ug/l.

Trans-1,2 Dichloroethene was detected in groundwater samples at concentrations ranging from ND to 6,000 ug/l.

Methylene Chloride was detected in groundwater samples at concentrations ranging from ND to 110,000 ug/l.

Trichloroethene was detected in ground samples at concentrations ranging from ND to 24 ug/l.

Vinyl Chloride was detected in groundwater samples at concentrations ranging from ND to 5,400 ug/l.