LC-101_Soil_Remediation_Scope.pdf

LAKE COUNTY COMMUNITY HEALTH PROGRAM (LCCHP) –

LEAD CONTAMINATED

SOIL REMEDIATION SCOPE

AND SITE PLAN

FOR

145 ELM STREET

LEADVILLE, COLORADO

Prepared for:

ALISSA SCHULTZ

CDPHE

4300 CHERRY CREEK DRIVE SOUTH

BUILDING B

DENVER, CO 80246

Prepared by:

JACOB FICCA

LEAD RISK ASSESSOR

CDPHE CERTIFICATE NO. 20823

GOBBELL HAYS PARTNERS, INC.

10500 E. 54TH AVENUE, SUITE J

DENVER, CO 80239

GHP PROJECT NO. 11503.30

LC-101

May 31, 2016

Soil Remediation Scope and Site Plan Page 1

LCCHP – LEAD CONTAMINATED SOIL REMEDIATION SCOPE

AND SITE PLAN

145 Elm Street in Leadville, Colorado

PART 1. PROJECT PARTICIPANTS

1.1 CDPHE Representative: Alissa Schultz

1.2 Project Consultant: Gobbell Hays Partners, Inc. (GHP)

1.2.1 GHP Lead Inspector & Risk Assessor: Jacob Ficca

1.2.2 GHP Senior Project Manager: Joshua Crochet

1.3 Lead Abatement Contractor: TBD

1.3.1 Contractor Lead Supervisor: TBD

1.3.2 Contractor Project Manager: TBD

PART 2. GENERAL SCOPE OF WORK

2.1. Introduction:

The objective of the following Lead Contaminated Soil Remediation response actions will be to remove the contaminated soil source of lead and/or eliminate the pathway of lead exposure through covering or other means of containment. In general, the replacement or cover material utilized will be similar in kind to the existing materials to be removed or covered, with consideration given to property owner/resident preferences.

The Lead Abatement Contractor (LAC) will comply with and perform all work in strict accordance with the Lake County Community Health Program (LCCHP) Phase 2 Work Plan guidelines, including but not limited to Section 5.4 Soil Response Actions, and comply with all OSHA Construction Standard and OSHA Lead Standard 1926.62, EPA, and CDPHE Regulations where applicable.

In the process of identifying appropriate options and making recommendations for soil response actions, GHP evaluated the condition of existing vegetation, the use patterns of the property, and current drainage patterns within and adjacent to the property. In

Soil Remediation Scope and Site Plan Page 2 general, removal and replacement of lead contaminated soils, as well as enclosure, will be the preferred soil response action options.

All work will be carried out as detailed in this Remediation Scope and Site Plan and in accordance with the provisions of the Contractors Agreement and the General Conditions of the Contractors Agreement.

2.2 Yard Preparation and Site Controls

2.2.1 Access Controls

During remediation activities, the LAC will provide clean access to the residents at all times. Clean access means the resident will not have to walk through remediation work areas/OSHA regulated work areas, or lead contaminated soil prior to entering their home.

Sidewalks will be thoroughly brushed (using wet methods) and washed off with water after each workday to provide as clean an entry as possible to the residence. If there is no sidewalk to the residence, a clean non-slip pathway to the residence will be provided by laying down plywood, pallets, plastic, or using other temporary measures to prevent exposure and tracking of contaminated soils.

LAC will install sufficient barriers around all work areas to keep all residents (especially children) out of remediation and construction work areas. Unsafe excavation areas or stockpiled soils will be fenced to prevent accidents and exposure.

2.2.2 Utilities and Surface Obstacles

Prior to beginning any work, LAC will be responsible for coordinating private and public utility locates for electrical, water, sewer, gas, cable, and phone lines. CDPHE will also work with/ask the property owner/resident to provide any information they may have on the location of subsurface obstacles (i.e., septic systems and abandoned utility lines, etc.).

Should excavation activities impinge upon any known buried utilities/obstacles, the remediation contractor will be required to hand-excavate the area.

LAC will be responsible for protection of utilities and replacement of utilities damaged by LAC’s work.

Soil Remediation Scope and Site Plan Page 3

Surface obstacles to be removed prior to remediation will be identified by CDPHE and the remediation contractor. The property owner/resident will be asked to move such obstacles and any personal possessions away from the area to be remediated. In special cases, where the property owner/resident is physically unable to move the identified obstacles, the contractor will be available to assist them in the removal process. Fences and gates will be removed, if necessary, to facilitate access to the work areas. All fences and gates will be replaced and fully restored to pre-construction conditions by the LAC at the end of remediation activities.

2.2.3 Dust Control

LAC will use water application to minimize the potential for fugitive dust emissions.

Application rates will be regulated to control dust during excavation yet not result in the development of mud. The objective is to minimize airborne dust and, at the same time, minimize production of mud that could be transported off-site on haul trucks and other mobile equipment.

Dust suppression equipment will consist of standard garden hoses and spray regulators.

Outdoor faucets and hydrants from private residences and public areas will be used as water supply sources. The CDPHE and their contractors will coordinate with residents and the local municipalities regarding water use. At properties where water sources are not available, LAC will provide a tanker truck or trailer for the water supply.

LAC will provide water applications during the course of remediation and restoration operations on an as-needed basis, as follows:

- Prior to excavation activities and prior to travel of equipment and work crew on the site on a daily basis;

- During soil removal operations by heavy equipment and by hand crews;

- At work intervals where wind and/or dry weather require such actions to prevent airborne emissions;

- During stockpiling and/or loading of soils for transport;

- To wash down sidewalks, alleys, or streets impacted by soil handling and transportation activities (these areas may be swept if it can be accomplished without dust);

- Prior to the placement of fill or cover materials during the restoration process; and

- Prior to leaving the premises at the end of each workday.

Soil Remediation Scope and Site Plan Page 4

2.2.4 Protection of Structures and Plants

Excavation by hand will be required for all areas susceptible to potential damage from heavy equipment operations. Areas of concern include structures (i.e., houses, garages, sheds, paved driveways and sidewalks) and landscaping vegetation (i.e., trees, hedges, and large shrubs). GHP will periodically inspect structures and buildings for evidence of damage resulting from remediation activities. If remediation activities do result in any damages, the CDPHE will immediately contact the property owner to determine and discuss the extent of the damage and any repair work needed. All repairs to areas/features damaged by the LAC will be the responsibility of the LAC with no additional costs to CDPHE.

2.3 General Remediation Procedures per the LCCHP Phase 2 Guidelines

This Section (2.3) gives a general overview of the LCCHP Phase 2 Guidelines for how the LCCHP program responds to various soil remediation projects in Leadville. The site-specific scope of work details for this particular project is specifically outlined below in Sections 2.4, 2.5, and 2.6. Soil response action activities will be planned to minimize both physical and lead-related hazards for workers and residents. This includes sound safety measures, operating heavy equipment in a safe manner and performing actions at each property quickly and efficiently to limit disturbance to the residents.

2.3.1 Removal and Replacement

The extent of removal will be based on the results of soil sampling efforts and will be identified in the Response Action plan and on the Soil Remediation Site Plan. Individual areas selected for excavation will generally encompass, at a minimum, the entire area represented by a single composite sample unless another type of action is selected for a portion of the area. Yard soils will be excavated to a minimum depth of 6 inches and a maximum depth of 12 inches. Vegetable garden areas identified during the sampling efforts would typically be excavated to depth of 12 inches, depending on the results of the soil sampling in these areas. In general, the following areas may be excavated (subject to the results of sampling in these areas): sod areas; landscaped areas; roadway shoulders (if curb and gutter are not present) to the edge of the road and to the lateral extent of the property lines; garden areas; play areas; unpaved driveways; garages with earthen floors; unpaved storage areas; and areas under temporary structures such as storage sheds, landscape timbers, stepping stones, etc. Excavation will not occur in areas that are paved or otherwise covered (such as concrete pads, patios, sidewalks, paths, and driveways) or in areas where permanent structures are present, which preclude exposure (such as houses, garages with paved floors). Larger trees and shrubs will be left in place. Excavation around shrubs and tree roots will be performed by a

Soil Remediation Scope and Site Plan Page 5 combination of equipment and handwork to remove as much contaminated soil as practical without undue damage to the plant’s root system. Smaller shrubs can be removed if required. If a property owner/resident wishes to save any small plants, shrubs, or bulbs in the removal areas they will be required to remove them prior to the initiation of excavation activities. Once excavation around plants is completed, backfill will be initiated as soon as possible using dampened replacement of soils to reduce plant stress.

Existing contaminated soil and sod can be removed using a variety of powered equipment and hand tools, as necessary. Primary equipment will consist of skid steer loaders, frontend loaders and small backhoes. Clean replacement material may consist of topsoil, road base, gravel, decorative rock or other landscape materials (decorative bark or mulch) and will be selected by the CDPHE Project Manager to match the existing materials or other suitable material based on the property owner’s/resident’s preference. Replacement soil material will meet the requirements specified in 3.4.3.7 of the LCCHP Phase II Work Plan.

Oversight personnel will perform inspections to verify the depth of removal.

Replacement fill shall be placed to depths to match surrounding grade or to greater depths if necessary to correct drainage problems. Prior to placing fill material in the excavated area, the contractor should establish final grade lines to ensure the required amount of fill will be placed. The area should be sloped to keep drainage away from the house and other structures. Compaction of the replacement soil in areas to be vegetated will be accomplished using the loader bucket of the placement equipment to back-blade the material to the required thickness prior to the application of sod or seeding. Gravel or road base used as fill material for driveway or walkway areas will be compacted, as appropriate, using suitable equipment to avoid future settlement and drainage problems. Garden soils, flowerbed soils and sand for play areas will be placed loose and left un-compacted. Sprinkler systems encountered will be either excavated by hand and saved or removed and disposed of with other debris. Generally the sprinkler heads will be removed and saved along with major components such as manifolds, valves and controllers. The pipes will be removed and disposed. Upon backfill the pipes will be replaced and the saved or usable components re-installed. It is the responsibility of the LAC to protect all components of existing sprinkler systems and to ensure proper functioning of sprinkler systems after the completion of work.

2.3.2 Soil Cover/Capping

The extent of areas selected to receive soil cover will be identified in the Response Action Plan and Soil Remediation Site Plan. Cover soil consisting of general fill, topsoil, or gravel road base will be placed to a minimum depth of 6 inches or to greater depth as needed to match surrounding grades or to correct an identified drainage problem. The

Soil Remediation Scope and Site Plan Page 6 selection of the appropriate type of cover material will be based on the existing materials currently in-place and the property owner’s/resident’s preference. Decorative rock or landscape materials (i.e., decorative bark or mulch) will not be suitable for use as the sole cover material. Cover soil material will meet the general requirements identified in Section 3.4.3.7 of the LCCHP Phase 2 Work Plan. Compaction of the cover materials will be accomplished using the same procedures identified in Section 2.3.1 for replacement soils.

2.3.3 Seeding and Sod Placement

Vegetation will be established by either seeding or sod placement only where previously existing vegetation was removed, and will typically be performed only after a yard area has been remediated (i.e., in-situ mixing, soil capping or removal and replacement) as indicated on the Soil Remediation Site Plan. The selection of seeding or sod placement will be based primarily on the pre-remediation conditions of the property but may also be influenced by other site conditions that could preclude sod application.

Prior to seeding or sod placement and in conjunction with fertilizer application, the area will be prepared by lightly raking or discing (to a 2-inch depth) the surface. Typically, an inorganic fertilizer will be applied using the following mix: nitrogen (as N), 60 lb/acre;

phosphorous (as P2O5), 60 lb/acre; and potassium (as K2O), 30 lb/acre (i.e., N-P-K of 60- 60- 30). Alternate organic fertilizer blends may also be considered.

Companies specializing in sod production will supply sod. The sod shall be a blend of grass types suitable for the growing conditions at the site. Success has been achieved in the past utilizing a blend of 60% bluegrass, 30% rye, and 10% fine fescue.

Sod will be placed as soon as possible after delivery. Sod will be installed with tight seams and joints to meet with adjoining lawns, walks, fences or borders and no overlapping. The remediation contractor will water areas of new sod immediately after installation and will lightly roll the sod to achieve a good bond between the sod and soil.

The property owner or resident will be responsible for maintaining sod once the installation and initial watering is completed. Maintenance includes the necessary fertilizing and watering required according to the grower’s specifications. Information on the proper care and maintenance of sod will be provided by the LAC to all residents receiving new sod.

Seeding will be performed utilizing a native-grass seed mixture suitable for the growing conditions at the site and acceptable to the property owner/resident. Seed may be applied by dry broadcast, hydro seed or drill methods. If dry broadcasting is used, the surface shall be lightly raked following seed application. Mulch will not typically be

Soil Remediation Scope and Site Plan Page 7 applied for seeded yard areas.

2.3.4 Surface Water Diversions

As discussed previously, surface water diversions may be implemented as a component of a soil response action, but they will not typically be the primary response action at a property. In some cases, diversion ditches or berms may be constructed or culverts placed to reroute run-on from adjacent areas if necessary to protect a remedy or to prevent future contamination. Specific details of appropriate surface water diversions will be developed on a property-by-property basis and will be included in the Response Action Plan and Soil Remediation Site Plan.

2.3.5 Cover and Replacement Fill Requirements

Soils used as replacement fill or cover material will be obtained from local borrow sources and will be tested to verify compliance with the program’s “clean fill” standard.

All sources of fill material (i.e., general fill, topsoil, or road base) will be tested prior to transportation to the site to confirm that the concentrations of lead, arsenic and cadmium are below the standards established for the program, as listed on Table 5-1.

The fill material will also be submitted for paste pH and gradation analysis for comparison to the requirements listed on Table 5-1. With respect to soil texture or gradation, material used for general fill or topsoil will generally be a sandy silt material with less than 10 percent by weight made up of material sized greater than 2 inches in diameter. Gravel road-base material used for driveway, walkway or other areas at the request of the property owner/resident shall generally meet the requirements of a Class 6 (3/4-inch maximum) or Class 5 (1.5-inch maximum) aggregate as specified by the Colorado Department of Transportation and will most likely be obtained from a commercially operated gravel pit.

Gravel road base or other general fill material obtained from a commercial source will be sampled and tested once prior to use at any residential properties within OU9. Fill materials obtained from borrow areas or other sources within the California Gulch Superfund Site will be sampled and tested once prior to use and periodically thereafter at the minimum frequency of approximately one sample per 1,000 cubic yards of material used. Clean fill material may be stockpiled at a central location and delivered for use at individual properties as the need arises. When sampled, a composite sample will be collected from a stockpile or original source of fill material and analyzed for the parameters listed in Table 5-1.

Composite samples representative of the material in use at the time of sampling will be

Soil Remediation Scope and Site Plan Page 8 analyzed for the parameters listed in Table 5-1 in accordance with the SOP for Fill Sampling (Appendix A of the Work Plan). Each fill sample will be analyzed for lead at an off-site laboratory by USEPA SW-846 Method 6010B (refer to QAP, Appendix B of the Work Plan). In addition to lead, samples will be analyzed for arsenic, cadmium, pH, organic content and particle size retained on the No. 200 sieve (>0.075 mm). Table 5-1 specifies the requirements for fill materials placed on residential properties. If these requirements are not met, the materials will not be used.

The LAC will be responsible for locating and procuring sources for cover and replacement fill. The LAC shall provide documentation to the CDPHE Project Manager that all materials meet project requirements.

For each sampled stockpile the properties receiving the material will be tracked and the lead concentration as well as other physical characteristics of the sample will be recorded in the property file.

2.3.6 Soil Transport and Disposal

Excavated soil, sod and related yard debris will be transported to the California Gulch Superfund Site-Wide Repository after approval and access from Lake County, as discussed in Section 2.6 below. Excavated soils will be removed from the property at the earliest opportunity. Transport to the soil repository will require travel on public roads, will generally be limited to daylight hours and will be performed in a safe and controlled manner in accordance with State and local rules and regulations. Loads will be kept below the upper edges of the truck bed and moistened with a water spray, as necessary, to minimize the dispersal of excavated soils through airborne emission or spillage.

2.4 Site Security/Consumable Utilities

2.4.1 LAC is responsible for the security of their regulated work areas and their equipment, materials, supplies throughout the duration of their work.

2.4.2 Owner is expected to provide all needed electrical power and water for the project. In the event power/water needs of the LAC are greater than what can be provided by the owner, LAC will provide costs associated with them supplying any additional needed electricity (generators must be “whisper type” machines or equivalent for noise control), and LAC will provide needed water (including potable water for wash stations).

Soil Remediation Scope and Site Plan Page 9

2.5 Site-Specific Scope of Work Summary

GHP understands that a section (or sections) of the fence will be removed by the homeowner, or with the LAC’s assistance, to provide access for the LAC prior to remediation work occurring. The section(s) of fence to be removed will be determined in the field during the bid-walk with the LAC. Once the remediation work and project is complete, the LAC will re-attach the section(s) of fence.

The LAC will be responsible to provide clean access to the home by washing/scrubbing walkways the residents use to enter their home.

Once excavation work has been completed the homeowner will install a sprinkler system prior to backfill initiating. The homeowner will coordinate closely with the LAC regarding installation of the sprinkler system so as not to impact progress of work or LAC's schedule. If homeowner is not able to coordinate with LAC, LAC shall proceed with completing the work without installation of the sprinkler system.

Backfilled or replacement top soil will be considered “clean” only after laboratory analysis demonstrates acceptable/approved levels of lead, arsenic, and cadmium per Table 5-1 of the LCCHP Phase 2 Work Plan (attached).

2.5.1 Soil Remediation of the front yard areas to be backfilled with clean topsoil and capped with landscape gravel

Remove approximately 300 sq. feet by 12” deep of lead contaminated soils starting at the northeast side of the house extending to the street on the outside of the fence line and along the front porch area to the west of the property.

GHP and CDPHE will visually inspect the work area for completeness of excavation work.

GHP will also conduct soil clearance testing of the excavation area.

Once excavation work is inspected/accepted by GHP and CDPHE, LAC will back fill the excavated area with a minimum of 10” clean top soil, tamp and level the backfilled soil then back fill a minimum of 2” of clean landscape gravel and level in an appropriate manner to create a positive drain situation away from structures.

A 2”x 8” treated wood landscaping border or rounded-top steel landscape edging will be installed along the landscape gravel line to contain the landscape gravel.

Soil Remediation Scope and Site Plan Page 10

2.5.1 - Option A (Bid Alternate 1) An optional permeable weed barrier may be installed after the 10” of clean soil is back filled/tamped and leveled and before the landscape gravel is installed, this option will be determined by CDPHE and the LCCHP Work Group after receiving bids from the LAC.

2.5.2 Soil Remediation of the front yard areas to be backfilled with clean topsoil and capped with sod

Remove approximately 900 sq. feet by 12” deep of lead contaminated soils starting at the northeast corner of the fence line extending across to the west by southwest tree line and down to the central fence line.

GHP and CDPHE will visually inspect the work area for completeness of excavation work.

GHP will also conduct soil clearance testing of the excavation area.

Once excavation work is inspected/accepted by GHP and CDPHE, the LAC will backfill the excavated area with a minimum of 10” clean top soil. Again, top soil will be considered “clean” only after laboratory analysis demonstrates acceptable/approved levels of lead, arsenic, and cadmium per Table 5-1 of the LCCHP Phase 2 Work Plan (attached). Once backfilled, tamp and level the soil then backfill additional clean top soil and level to bring the clean top soil back to the original 12” level. Topsoil will be tamped and leveled in an appropriate manner to create a positive drain situation away from structures.

LAC will install sod after excavation/backfill, sod selected should be suitable for the elevation/climate in Leadville. Sod source is subject to approval by the CDPHE Project Manager prior to installation.

2.5.3 Soil remediation of the front yard tree line area along the north and west fence line to have trees planted, backfilled with clean topsoil and capped with sod

The home owner expressed that the original cottonwood trees in the north and west portions of the yard will be removed by the homeowner prior to soil remediation work occurring. The home owner will remove the existing trees and root wads to a depth of 12 inches or deeper as needed to allow the LAC to remove contaminated soil from this area and plant new trees as described below.

Remove approximately 200 sq. feet by 12” deep of lead contaminated soils after original cottonwood trees have been removed by the homeowner. Excavate additional lead contaminated soil in an appropriate manner to provide for the quantity of new trees desired (to be determined by CDPHE and the homeowner). Excavate to provide for new trees by creating a saucer shaped planting hole that is at least 3 times the root ball

Soil Remediation Scope and Site Plan Page 11 diameter. The depth of the planting hole should allow the root ball to sit directly on a level undug soil surface and the top of the root ball rises 1-2” above the original un-excavated grade. The tree quantity and tree line length will be determined by CDPHE and the homeowner.

Once excavation work is inspected/accepted by GHP and CDPHE, the LAC will backfill the excavated area with a minimum of 10” clean top soil, any areas that require backfill must also be tamped by hand or mechanical means. Once all areas are tamped and leveled, additional top soil should be back filled to reach a total of 12” of clean top soil.

Backfill around newly planted trees in an appropriate manner to provide for 3-4” from the tree trunk to be uncovered, no backfill soil should be placed over the top of the root ball. Specifics of this Section (Section 2.5.3) are subject to change based on conversations with the LAC and landscaping contractor during the bid-walk. Discussions will include logistics and proper methods, including timing needs of parallel installation of trees with the LAC’s work or post-installation of trees by the landscaping contractor after the LAC’s work is finalized, etc.

LAC will install sod after excavation/backfill, sod selected should be suitable for the

2.5.4 Soil remediation of the back/side yard areas to be backfilled with clean topsoil and capped with sod

Remove approximately 800 sq. feet by 12” deep of lead contaminated soils starting at the northwest corner of the back yard (i.e., NW corner where the west by southwest fence line and the central fence line meet) extending east to the house and along the house to the south/east and along the deck until parallel with the shed (please refer to site drawing for detailed location).

GHP and CDPHE will visually inspect the work area for completeness of excavation work.

GHP will also conduct soil clearance testing of the excavation area.

Once excavation work is inspected/accepted by GHP and CDPHE, the LAC will backfill the excavated area with a minimum of 10” clean top soil, tamp and level the backfilled soil, then back fill additional clean top soil and level to bring the clean top soil back to the original 12” level. Topsoil will be tamped and leveled in an appropriate manner to create a positive drain situation away from structures.

Soil Remediation Scope and Site Plan Page 12

LAC will install sod after excavation/backfill, sod selected should be suitable for the

2.5.5 Soil Remediation of the back yard area east of the shed and northwest of the chicken coop to be backfilled with clean topsoil and capped with sod

*Note – The LCCHP Work Group will decide which cost-effective Option (Option A, B, or C – below) to select after receiving bids from the LAC and landscape contractors after the bid-walk.

Remove approximately 150 sq. feet by 12” deep of lead contaminated soils east of the shed and northwest of the chicken coop.

GHP and CDPHE will visually inspect the work area for completeness of excavation work.

GHP will also conduct soil clearance testing of the excavation area.

Once excavation work is inspected/accepted by GHP and CDPHE, the LAC will back fill the excavated area with a minimum of 10” clean top soil, tamp and level the backfilled soil, then back fill additional clean top soil and level to bring the clean top soil back to the original 12” level. Topsoil will be tamped and leveled in an appropriate manner to create a positive drain situation away from structures.

LAC will install sod after excavation/backfill, sod selected should be suitable for the

2.5.5-Option A. (Bid Alternate 2) chicken coop to be backfilled with clean topsoil and capped with pea gravel

GHP and CDPHE will visually inspect the work area for completeness of excavation work.

GHP will also conduct soil clearance testing of the excavation area.

Once excavation work is inspected/accepted by GHP and CDPHE, the LAC will back fill the excavated area with a minimum of 10” clean top soil, tamp and level the backfilled

Soil Remediation Scope and Site Plan Page 13 soil. Topsoil will be tamped and leveled in an appropriate manner to create a positive drain situation away from structures.

The LAC will then install a permeable weed barrier and a 2”x8” treated wood landscaping border or rounded-top steel landscape edging along the pea gravel/sod line then the LAC will backfill 2” pea gravel and level.

2.5.5-Option B. (Bid Alternate 3) chicken coop to be backfilled with clean top soil and capped with pea gravel and flagstone

GHP and CDPHE will visually inspect the work area for completeness of excavation work.

GHP will also conduct soil clearance testing of the excavation area.

Once excavation work is inspected/accepted by GHP and CDPHE, the LAC will backfill the excavated area with a minimum of 8” clean top soil, tamp and level the backfilled soil.

Topsoil will be tamped and leveled in an appropriate manner to create a positive drain situation away from structures.

LAC will then install a permeable weed barrier and a 2”x8” treated wood landscaping border or rounded-top steel landscape edging along the pea gravel/sod line. The LAC will backfill 4” pea gravel, level and install flagstone in a manner accepted by the home owner.

2.6 Waste Disposal

• The Lead Abatement Contractor (LAC) must obtain approval from Lake County to use the California Gulch Soil Repository for soil disposal (disposal is free of charge;

however, Contractor must obtain approval to use the Repository). Contractor must call Lake County Commissioner Mike Bordogna (work: 719-486-0993; cell: 719-486- 4512) and the Lake County Road and Bridge Department (719-486-0259) in advance for approval and to schedule the use of the locked Soil Repository.

• Contractor is advised the Repository’s access/lay-out is restricted (sharp turns etc.

that may impede certain types/sizes of trucks coming into and out of the Repository).

• Only lead contaminated soil can be taken to the Soil Repository. Demolition material (i.e. cleaned concrete, 2-inch pipe, cleaned rebar, etc.) may be disposed of

Soil Remediation Scope and Site Plan Page 14 at the Lake County Landfill, upon their approval, and is not to be disposed of at the Soil Repository.

2.7 Compliance with all Applicable Regulations

• LAC will comply with OSHA, EPA, CDPHE regulations and LCCHP Phase 2 Work Plan guidelines for all work.

• LAC will install required Lead Work Area warning tape barriers and signage, and restricting access into all work areas including all residents (especially children) during remediation activities. Unsafe excavation areas or stockpiled soils will be fenced to prevent accidents and exposure. In addition to OSHA tape and signage, LAC will install at a minimum heavy vinyl orange snow fence or chain link fences to restrict access into their contaminated soil work areas at all times.

• LAC will be responsible for their OSHA-required worker exposure monitoring including personal/excursion and outside their work area air sampling throughout soil remediation/excavation operations. All OSHA-required air sample results must be posted at the work site within 24 hours of sample procurement.

2.8 Schedule/Liquidated Damages

• Schedule and other liability specifics will be outlined in the LAC’s and landscape contractor’s associated contracts with CDPHE.

2.9 Remediation Site Plan

• GHP’s Soil Remediation Site Plan (attached) includes drawings that identifies the areas to be remediated and the associated response action(s) for those areas. The drawing generally illustrates the boundary of the developed property, locations of the main residence and other structures, driveways, sidewalks, flower beds, garden areas, bare areas, and any other pertinent property features.

• The Site Plan generally indicates the existing types of vegetation, landscape materials, and other ground cover (e.g., concrete, asphalt, gravel, etc.) present.

• The Site Plan generally outlines the areas of work and areas to be excavated. The property boundary indicated on the Site Plan is based on visual observations of the property and discussions with the property owner, and is not based on the legal description of the property.

• Actual work area critical measurements/locations will be determined in the field by GHP and CDPHE and explained to the LAC’s site superintendent during the bid-walk and subsequent fieldwork.

Soil Remediation Scope and Site Plan Page 15

2.10 Contractor Oversight and Monitoring

• GHP will be the sole provider of Lead Inspector and Risk Assessor services on this project under a separate contract with CDPHE and will remain independent from the LAC throughout the project.

• Should the LAC find discrepancies in, or omissions from the Scope of Work, or should he/she be in doubt as to their meaning, he/she shall immediately notify GHP and CDPHE in writing for interpretation and/or clarification, in accordance with the terms of the Contract.

Site Plan 145 ELM St. Soil Remediation Work Plan