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Pacific Gas & Electric Company

Project Site Condition and 10% Design Report

Supplemental Environmental Project Hinkley Remediation Project

October 2012

Project Site Condition and 10% Design Report Supplemental Environmental Project Hinkley Remediation Project

Brent Alspach, PE Project Engineer ARCADIS U.S., Inc.

Shakeel N. Jogia, P.E. Senior Project Manager Pivox Corporation Prepared for:

Pacific Gas & Electric Company

Prepared by:

ARCADIS U.S., Inc. 1525 Faraday Avenue Carlsbad CA 92008 Tel (760) 602-3800 PIVOX Corporation 595 Market Street, Suite 630 San Francisco, CA 94105

Our Ref.:

RC000699.0100.00003 PIVOX Ref.:

PGE-12-T49

Date:

October 2012

Hinkley SEP - RWQCB Design Report_Final.docx

Preliminary – Not For Construction i

Table of Contents

1. Introduction 1

1.1 Project Background 1

2. Existing Site Condition 2

2.1 Existing Water Supply Permit 2

2.2 Existing Hinkley School Infrastructure 2

2.3 Supply and Conveyance 2

2.3.1 Supply Wells 2

2.3.2 Conveyance 3

2.3.3 Treatment 3

2.4 Existing School Water Quality 4

2.4.1 School Supply Wells 4

2.4.2 PG&E Replacement Drinking Water 4

2.5 Existing/Current School Water Demand 4

2.6 Existing System Deficiencies 4

2.6.1 Water Quantity 4

2.6.2 Water Quality 5

3. Preliminary System Design 6

3.1 Primary Design Parameters 6

3.2 CEQA 6

3.3 Supply and Conveyance Design 6

3.3.1 SEP Water Source Description 7

3.3.2 SEP Water Quality 7

3.3.3 Water Quantity 8

3.3.4 Conveyance System Improvements 8

3.4 SEP System Disinfection and Treatment 8

3.4.1 Supply Well PGE-14 Treatment 8

3.4.2 Treatment for Hexavalent Chromium 9


Preliminary – Not For Construction ii

Table of Contents

3.4.3 Disinfection 9

3.5 New School Site Infrastructure 9

3.5.1 School Site Water Storage 9

3.5.2 School Site Water Distribution 10

3.5.3 Controls and Instrumentation 10

4. System Operations 11

4.1 Permitting 11

4.1.1 County Health – Water Supply Permits 11

4.1.2 County Public Works – Construction Permits 12

4.2 Operation and Maintenance 12

Tables

Table 1: Existing School Supply Wells 2

Table 2: SEP Primary Design Parameters 6

Table 3: SEP Supply Wells 7

Table 4: SEP Supply Well Water Quality Data Following Text

Attachments

A 10% Design Drawings

B Hinkley School Consumer Confidence Reports

C Results of Hinkley School Well Sampling, September 2012

D Email from San Bernardino County Department of Health regarding CEQA Reporting Exemption


Preliminary – Not For Construction 1



1. Introduction

1.1 Project Background

Pacific Gas and Electric (PG&E) is implementing a Supplemental Environmental Project (SEP) in accordance with California Regional Water Quality Control Board, Lahontan Region [“Water Board”]Board Order No. R6V-2012-0013. The SEP consists of design and installation of a new water supply for the Hinkley School (School), located in Hinkley California.

In order to provide a new water source to the School, PG&E will extend an existing PG&E underground water distribution system to the School. All water system infrastructure will be permitted by the San Bernardino County Department of Environmental Health Services (County). The SEP requires PG&E to provide this water supply to the school for a period of 20 years or until the Barstow Unified School District (BUSD) chooses to use an alternative water supply.

This report presents preliminary 10% level design information in accordance with the SEP Work Plan.





2. Existing Site Condition

2.1 Existing Water Supply Permit

The existing School water system is a non-transient, non-community water system permitted (System #3600125) by the County.

The BUSD is the holder of the School water system permit and is responsible for maintaining compliance. PG&E has voluntarily supplied the School with bottled water since 2010.

2.2 Existing Hinkley School Infrastructure

The existing School water supply system consists of four water supply wells located on the southeast portion of the school property. These four wells convey water to above ground storage tanks, from which water is pumped to a pressure tank, supplying both school irrigation and drinking water distribution piping in parallel. Bottled water is currently being provided to the School for drinking water.

The School water supply system was originally constructed in the 1950s, when the School was built. The system has been upgraded periodically since original installation.

Drawing G02, included in Attachment A, shows a general representation of the School water supply and conveyance infrastructure. All existing system information presented in this report is based on information provided by the BUSD.

2.3 Supply and Conveyance

2.3.1 Supply Wells

The four supply wells are currently only used for irrigation water and non-drinking water purposes, as PG&E supplies the School with bottled drinking water under a voluntary program. Table 1 summarizes existing School supply well information.

Table 1: Existing School Supply Wells

Well a Year Installed Production Rate

(gpm) b

27-38/Well 1 1980 2.2





27-39/Well 2 1989 0.8

27-40/Well 3 Unknown; re-drilled in 1994 1.7

27-08/Well 4 1995 1.4 Notes: a Official designation/Hinkley School designation b gpm= gallons per minute; average since 2003

School personnel report that the four wells produce a total of approximately 10 gpm instantaneously, the wells dewater quickly and recharge slowly, and well yields have been declining in recent years.

2.3.2 Conveyance

A buried 2-inch polyvinyl chloride (PVC) pipeline conveys water from the School supply wells to four 5,000-gallon polyethylene storage tanks. The tanks are located at the northwest corner of the School property and are piped in parallel so that all four tanks fill simultaneously, creating approximately 20,000 gallons of effective storage. One of the four tanks is equipped with level switches that operate the downstream pressure tank and booster pump.

The four storage tanks feed a pneumatic pressure tank via a 7.5 horsepower (HP) booster pump. The pressure tank is filled by the booster pump based on level switches in the storage tanks and a pressure switch in the pressure tank. There is a low-low level switch in the storage tanks which shuts off the booster pump to prevent the storage tanks from running completely dry if there is a leak in the downstream distribution system.

The pressure tank provides a minimum 40 pounds per square inch (psi) service pressure to the School. From the pressure tank, water distribution piping splits to a 4-inch line that supplies water to the School irrigation system and a 2-inch line that supplies water to the School buildings, including drinking water taps. The two lines include isolation valves at the outlet of the pneumatic tank, allowing water to be directed to either or both purposes as needed.

2.3.3 Treatment

According to BUSD personnel, occasional as-needed calcium hypochlorite dosing for disinfection is the only treatment implemented in the current system.





2.4 Existing School Water Quality

2.4.1 School Supply Wells

The School water system Consumer Confidence Report provided by BUSD is included as Attachment B. PG&E performs additional supplemental sampling of the current School supply wells; a copy of the most recent School well sampling results letter is included as Attachment C.

2.4.2 PG&E Replacement Drinking Water

PG&E has voluntarily provided bottled water to the School since 2010 as a replacement to the drinking water produced by the School supply wells. This program has reduced community concerns and now serves as the sole drinking water source for the School.

2.5 Existing/Current School Water Demand

According to BUSD personnel and School supply well meter records, the School uses 80,000 to 500,000 gallons of water per month. Peak flow is during the summer months, when most of the water is used for irrigation. BUSD personnel estimate that a minimum of 80,000 gallons per month is needed for indoor water uses.

2.6 Existing System Deficiencies

The system deficiencies described below are based on comments provided by BUSD personnel.

2.6.1 Water Quantity

The BUSD reports that the existing supply wells have decreased in production rate over the past 10 years. The four wells previously yielded more than 10 gpm over a monthly average, but currently produce a monthly average of approximately 6 gpm. The water storage and the PG&E bottled water program have allowed the School to mitigate the effects of decreasing well production. When required, School personnel interrupt irrigation to maintain potable water supply to the School buildings.





Although the School receives bottled water from PG&E, the steadily decreasing supply rate indicates that it is possible the current wells will not indefinitely have sufficient capacity to provide full irrigation and indoor water supply to the School.

2.6.2 Water Quality

Although the existing School supply wells provide adequate water quality, the BUSD reports that hardness and manganese in the current supply present aesthetic issues (e.g., stained plumbing). BUSD also noted detectable arsenic concentrations, which are currently below Maximum Contaminant Levels (MCLs), as noted in Section 2.3.1.





3. Preliminary System Design

This section summarizes the current design status of the SEP School water supply project. The project design objectives and the basis of design have been established in this section.

3.1 Primary Design Parameters

Table 2 summarizes the primary design basis for the SEP. Specific design parameters are described in more detail in the subsequent sections of this report.

Table 2: SEP Primary Design Parameters

Design Parameter Value Basis

SEP System Water Supply Rate 15 gpm

Exceeds School well production by 250% and exceeds BUSD-reported maximum monthly demand by 30%

Storage Tank Volume 20,000 gallons Existing School storage tank volume

Water Conveyance Pipeline Diameter 4-inch 4-inch pipe capacity exceeds

15 gpm supply rate

SEP Water Supply Quality All federal and state drinking water standards

Public Water System permit requirements

3.2 CEQA

The San Bernardino County Department of Environmental Health Services is the California Environmental Quality Act (CEQA) lead agency for this project. County staff notified PG&E on August 9, 2012 that the SEP does not trigger CEQA reporting or evaluation requirements unless the project installs a storage tank(s) with a volume greater than 100,000 gallons. The August 9 notification is included as Attachment D.

3.3 Supply and Conveyance Design

The new water supply will be supplied via an extension of a PG&E Hinkley freshwater extraction and conveyance system. This system currently provides water to the Desert View Dairy (DVD) and the PG&E Hinkley Northwest Freshwater Injection (NFI) system.





Drawing P01, included in Attachment A, provides a schematic of the general location, arrangement, and layout of the overall system supply and conveyance infrastructure. Drawing P02, included in Attachment A, provides a process flow diagram that illustrates the general elements comprising the PG&E Hinkley freshwater extraction system and how the new School water supply system will be integrated into the existing supply and conveyance infrastructure.

3.3.1 SEP Water Source Description

The School will be supplied by three existing P&E water supply wells. Table 3 provides well installation details for the proposed new supply wells.

Table 3: SEP Supply Wells

Well Year Installed Production Rate

(gpm) a

PGE-14 1993 120 / 200

FW-01 2011 40 / 60

FW-02 2011 50 / 50 Note: a 2012 Average/Instantaneous

PGE-14 was originally installed as a drinking water supply well; FW-01 and FW-02 will require permitting for inclusion in the Hinkley School’s water supply system.

3.3.2 SEP Water Quality

Table 4, attached, shows that raw water from all three proposed supply wells meets all primary drinking water standards, with the exception of arsenic in PGE-14 (which is removed by treatment as described below). Hexavalent chromium levels in the blended water are typically at concentrations lower than 1 part per billion (ppb) and lower than current school well concentrations.

PG&E currently operates and maintains a Siemens well-head arsenic treatment system at well PGE-14 to remove naturally occurring arsenic and manganese prior to where this water mixes into the full PGE-14/FW-01/FW-02 stream. The post-treatment arsenic and manganese concentrations in PGE-14 water meet drinking water standards. PG&E currently collects monthly samples to confirm treatment system operation. The PGE-14 treatment system is described in Section 3.4 of this report.





3.3.3 Water Quantity

The SEP has a design parameter to provide an instantaneous flow of 15 gpm to the School. The three proposed supply wells provide a total of 210 gpm on average, with a total maximum instantaneous capacity of 310 gpm.

As described in the Water Board SEP Work Plan, PG&E will maintain sufficient water quantity to supply the School for 20 years. In addition, supply and conveyance infrastructure will be designed to accommodate additional supply and higher flow rates as needed. PG&E may install an additional extraction well to supply drinking water to the School and other PG&E Hinkley project freshwater consumers, if necessary.

3.3.4 Conveyance System Improvements

The SEP will include installing backflow prevention devices in the existing conveyance pipeline where required. Backflow prevention device specifications and installation locations will be based on County and California Department of Public Health (CDPH) requirements. Drawing P01 (Attachment A) shows the functional locations of backflow prevention devices currently planned. Preliminary evaluations indicate that a double check valve assembly device can be used.

Drawing C01 (Attachment A) shows the proposed alignment of the new conveyance pipeline extension from the end of the existing Hinkley Freshwater Extraction System piping near extraction well EX-09. At the EX-09 location, a new 4-inch high-density polyethylene (HDPE) pipeline will run along and on the Santa Fe Road shoulder to the southeast corner of the School property, where it will connect to the existing School underground pipeline. The 4-inch pipe has a maximum capacity of more than 100 gpm (based on maximum recommended pipeline water velocity); consequently, the conveyance pipe size will not limit future School water supply capacity.

3.4 SEP System Disinfection and Treatment

3.4.1 Supply Well PGE-14 Treatment

The existing treatment system at PGE-14 consists of a booster pump, bag filter assembly, and nine 20-cubic foot pressure vessels arranged in three banks of vessels piped in series (lead-lag-backup). The vessels contain Siemens Water Technologies ASG adsorbent media for the treatment of the arsenic. ASG is a granular arsenic adsorbent supplied in service exchange vessels for adsorption of metals from drinking





water, industrial wastewater, contaminated ground water and storm water runoff. A backwash system consists of a piping network and a 4,000-gallon backwash tank which is used monthly as part of the routine operations & maintenance (O&M) procedures. PG&E will continue to treat PGE-14 water as long as the water quality dictates. PGE-14 treatment system performance monitoring and sampling results will be reported as required by the County water system permit.

3.4.2 Treatment for Hexavalent Chromium

While the water proposed for delivery to the School meets all primary and secondary drinking water standards, trace levels of hexavalent chromium are present in the new water supply (at lower levels than current School well water supply). To remove any concern regarding hexavalent chromium in School drinking water, and until a drinking water standard for hexavalent chromium has been established, PG&E will voluntarily (independent of the SEP) install the process technology previously accepted by the Water Board for removing hexavalent chromium.

3.4.3 Disinfection

While the current School water supply and the existing PG&E Hinkley freshwater extraction system do not employ active disinfection, PG&E will include a disinfection system in the SEP supply system to be operated if required.

3.5 New School Site Infrastructure

Drawing P02 (Attachment A) depicts a process flow diagram that illustrates the new School water infrastructure to be included in the new School SEP system. Based on discussion with BUSD staff, any new water equipment will be installed on School property in the same location as the existing School water tanks, piping, and appurtenant equipment.

3.5.1 School Site Water Storage

The SEP will be designed to, at a minimum, meet the current School water storage volume of 20,000 gallons. The existing tanks will be reused or new tanks will be installed if determined necessary. Any new tanks will be certified for drinking water storage and will be fixed to concrete pads in accordance to the applicable seismic safety codes.





3.5.2 School Site Water Distribution

From the storage tanks, any new equipment determined necessary will largely replicate the existing School water system. Water will be pumped from storage tanks to a pneumatic pressure tank that will deliver a minimum of 40 psi of service pressure to the existing parallel school building and irrigation distribution pipelines.

3.5.3 Controls and Instrumentation

Flow meters and related instrumentation installed in the new system will be designed to log and transmit flow, pressure, total volume, and similar operational data to allow operators to control, monitor, and improve system performance.





4. System Operations

4.1 Permitting

4.1.1 County Health – Water Supply Permits

The new School supply system will be permitted as a revision to the School’s existing non-community, non-transient water system permit. PG&E has begun discussion with the San Bernardino County Department of Health on the permit application and review process.

PG&E will prepare and submit a Preliminary Engineering Report (PER) to the County that provides an engineering description of the proposed upgraded water system, including both new facilities and existing facilities that will continued to be used. The PER will include, as appropriate, engineering evaluations of the following:

• Proposed water supply with regards to School demands and required supply redundancy

• Proposed source water quality

• Supply well upgrades

• Conveyance system upgrades

• Cross-contamination/backflow prevention

• System disinfection

• Drinking water storage

• System operations and maintenance.

The County will review and provide comments, and detailed system design will follow County approval of the PER. Formal County approval and issuance of the revised School water supply system permit will follow system startup and sampling.





4.1.2 County Public Works – Construction Permits

PG&E will obtain the required construction permits prior to construction mobilization. The currently understood required construction permits include a San Bernardino County encroachment permit for installing the SEP conveyance pipeline along Santa Fe Road and a building permit for all installation work at the School site.

4.2 Operation and Maintenance

PG&E will be responsible for operating and maintaining water conveyance infrastructure up to the School water storage tanks.

PG&E will prepare a water quality monitoring plan that meets the requirements of the County water system permit. This plan will include an operations manual that describes all required O&M procedures for the new system components and an emergency preparedness and response plan that describes measures in place to protect the system during anticipated emergencies.

Table 4: SEP Supply Well Water Quality Data 10% Design Report

Supplemental Environmental Project Hinkley, California

1 of 5

Constituents Units California

Title 22 Standard

PGE-14 PGE-14-EFF FW-01 FW-02

Primary Standards (MCLs) Inorganics Aluminum mg/L 1 ND ND ND ND Antimony mg/L 0.006 ND ND ND ND Arsenic mg/L 0.01 0.015 ND 0.0023 0.0014 Asbestos mg/L 7 MFLa ND ND ND ND Barium mg/L 1 0.122 0.037 0.046 0.0547 Beryllium mg/L 0.004 ND ND ND ND Cadmium mg/L 0.005 ND ND ND ND Chromium, Total mg/L 0.05 ND ND 0.001 ND Chromium, Hexavalent mg/L 0.05i 0.00038 0.00035 0.00085 0.00097 Copper mg/L 1.3b ND ND ND ND Cyanide mg/L 0.15 ND ND ND ND Fluoride mg/L 2 0.743 0.755 0.639 0.624 Lead

mg/L 0.05c

ND ND ND ND 0.015b Mercury mg/L 0.002 ND ND ND ND Nickel mg/L 0.1 ND ND ND ND Nitrite as Nitrogen mg/L 1 ND ND ND ND Nitrate (as Nitrogen) mg/L 10 ND ND 1.01 1.1 Perchlorate µg/L 6 ND ND ND ND Selenium mg/L 0.05 ND ND ND ND Thallium mg/L 0.002 ND ND ND ND Radionuclides Uranium, Total pCi/L 20 4.11 ND 2.14 3.08 Combined Radium – 226 + 228 pCi/L 5 <4 <2 <2 <2 Gross Alpha pCi/L 15 8.54 ND ND 3.92 Gross Beta millirem/yr 4h ND ND ND ND Strontium-90 pCi/L 8 ND ND ND ND Tritium pCi/L 20,000 ND ND ND ND VOCS Benzene µg/L 1 ND ND ND ND Carbon Tetrachloride µg/L 0.5 ND ND ND ND 1,2-Dichlorobenzene µg/L 600 ND ND ND ND 1,4-Dichlorobenzene µg/L 5 ND ND ND ND 1,1-Dichloroethane µg/L 5 ND ND ND ND 1,2-Dichloroethane µg/L 0.5 ND ND ND ND



2 of 5


Title 22 Standard


1,1-Dichloroethylene µg/L 6 ND ND ND ND Dichloromethane µg/L 5 ND ND ND ND 1,3-Dichloropropene µg/L 0.5 ND ND ND ND 1,2-Dichloropropane µg/L 5 ND ND ND ND 1,3-Dichloropropane µg/L NA ND ND ND ND Ethylbenzene µg/L 300 ND ND ND ND Methyl-tert-butyl ether (MTBE) µg/L 13 ND ND ND ND Monochlorobenzene µg/L 70 ND ND ND ND Styrene µg/L 100 ND ND ND ND 1,1,2,2-Tetrachloroethane µg/L 1 ND ND ND ND Tetrachloroethylene µg/L 5 ND ND ND ND Toluene µg/L 150 ND ND ND ND 1,2,4-Trichlorobenzene µg/L 5 ND ND ND ND 1,1,1-Trichloroethane µg/L 200 ND ND ND ND 1,1,2-Trichloroethane µg/L NA ND ND ND ND Trichloroethylene µg/L 5 ND ND ND ND Trichlorofluoromethane µg/L 150 ND ND ND ND 1,1,2-Trichloro-1,2,2-Trifluoroethane

µg/L 1,200 ND ND ND ND

Vinyl chloride µg/L 0.5 ND ND ND ND Xylenes µg/L 1,750 ND ND ND ND SOCs Alachlor µg/L 2 ND ND ND ND Atrazine µg/L 1 ND ND ND ND Bentazon µg/L 18 ND ND ND ND Benzo(a) Anthracene µg/L 10 ND ND ND ND Benzo(a)pyrene µg/L NA ND ND ND ND Carbofuran µg/L 18 ND ND ND ND Chlordane µg/L 0.1 ND ND ND ND Dalapon µg/L 200 ND ND ND ND Dibromochloropropane µg/L 0.2 ND ND ND ND Di(2-ethylhexyl)adipate µg/L 400 ND ND ND ND Di(2-ethylhexyl)phthalate µg/L 4 ND ND ND ND Dinoseb µg/L 7 ND ND ND ND Diquat µg/L 20 ND ND ND ND Endothall µg/L 100 ND ND ND ND Endrin µg/L 2 ND ND ND ND



3 of 5


Title 22 Standard


Ethylene Dibromide µg/L 0.05 ND ND ND ND Glyphosate µg/L 700 ND ND ND ND Heptachlor µg/L 0.01 ND ND ND ND Heptachlor Epoxide µg/L 0.01 ND ND ND ND Hexachlorobenzene µg/L 1 ND ND ND ND Hexachlorocyclopentadiene µg/L 50 ND ND ND ND Lindane µg/L 0.2 ND ND ND ND Methoxychlor µg/L 30 ND ND ND ND Molinate µg/L 2 ND ND ND ND Oxamyl µg/L 50 ND ND ND ND Pentachlorophenol µg/L 1 ND ND ND ND Picloram µg/L 500 ND ND ND ND Polychlorinated Biphenyls µg/L 0.5 ND ND ND ND Simazine µg/L 4 ND ND ND ND Thiobencarb µg/L 70 ND ND ND ND Toxaphene µg/L 3 ND ND ND ND 2,3,7,8-TCDD (Dioxin) pg/L 30 ND ND ND ND 2,4,5-TP (Silvex) µg/L 50 ND ND ND ND Disinfection Byproducts Total Trihalomethanes µg/L 80 ND ND ND ND Haloacetic Acids (Five) µg/L 60 - - - - Bromate µg/L 10 - - - - Chlorite mg/L 1 - - - - Acrylamide mg/L TTd - - - - Epichlorohydrin mg/L TTd - - - - Residual Disinfectant Chloramine (as Cl2) mg/L 4 - - - - Chlorine (as Cl2) mg/L 4 - - - - Chlorine Dioxide (as ClO2) mg/L 0.8 - - - - Microorganisms Coliform, Total --- 5%e ND ND ND ND E. coli MPN Presence/

absence MCLf ND ND ND ND

Cryptosporidium --- TT ND ND ND ND Giardia --- TT ND ND ND ND

Secondary Standards (SMCLs) Aluminum mg/L 0.2 ND ND ND ND



4 of 5


Title 22 Standard


Chloride mg/L 250 / 500 / 600g 48 45.4 29.4 30.1

Color Color units

15 ND ND ND ND

Copper mg/L 1 ND ND ND ND Foaming Agents (MBAS) mg/L 0.5 ND ND ND ND Iron mg/L 0.3 0.0579 ND ND ND Manganese mg/L 0.05 0.0748 ND 0.002 ND Methyl-tert-butyl ether (MTBE) mg/L 0.005 ND ND ND ND Odor—Threshold TON 3 ND ND 1J 1J pH SBU 6.5 – 8.5 7.57 7.46 7.52 7.51J Silver mg/L 0.1 ND ND ND ND Sulfate mg/L 250 / 500 /

600g 67.7 64 42.3 42

Specific Conductance μS/cm 900 / 1,600 / 2,200g 521 521 416 431

Thiobencarb mg/L 0.001 ND ND ND ND Total Dissolved Solids mgL 500 / 1,000

/ 1,500g 340 339 252 278

Turbidity NTU 5 0.248 ND 0.113 ND Zinc mg/L 5 ND ND ND 0.0142

Notification Levels Boron mg/L 1 ND ND ND ND n-Butylbenzene mg/L 0.26 ND ND ND ND Sec-Butylbenzene mg/L 0.26 ND ND ND ND Tert-Butylbenzene mg/L 0.26 ND ND ND ND Carbon Disulfide mg/L 0.16 ND ND ND ND Chlorate mg/L 0.8 ND ND ND ND 2-Chlorotoluene mg/L 0.14 ND ND ND ND 4-Chlorotoluene mg/L 0.14 ND ND ND ND Diazinon mg/L 0.0012 ND ND ND ND Dichlorodifluoromethane (Freon 12)

mg/L 1 ND ND ND ND

1,4-Dioxane mg/L 0.001 ND ND ND ND Ethylene Glycol mg/L 14 ND ND ND ND Formaldehyde mg/L 0.1 ND ND ND ND HMX mg/L 0.35 ND ND ND ND Isopropylbenzene mg/L 0.77 ND ND ND ND Manganese mg/L 0.5 0.0748 ND 0.002 ND



5 of 5


Title 22 Standard


Methyl Isobutyl Ketone (MIBK) mg/L 0.12 ND ND ND ND Napthalene mg/L 0.017 ND ND ND ND n-Nitrosodiethylamine (NDEA) mg/L 0.00001 ND ND ND ND n- Nitrosodimethylamine (NDMA) mg/L 0.00001 ND ND ND ND n-Nitrosodi-n-propylamine (NDPA) mg/L 0.00001 ND ND ND ND Propachlor mg/L 0.09 ND ND ND ND n-Propylbenzene mg/L 0.26 ND ND ND ND RDX mg/L 0.0003 ND ND ND ND Tertiary Butyl Alcohol (tBA) mg/L 0.012 ND ND ND ND 1,2,3-Trichloropropane (1,2,3-TCP) mg/L 0.000005 ND ND ND ND 1,2,4-Trimethylbenzene mg/L 0.33 ND ND ND ND 1,3,5-Trimethylbenzene mg/L 0.33 ND ND ND ND 2,4,6-Trinitrotoluene (TNT) mg/L 0.001 ND ND ND ND Vanadium mg/L 0.05 0.0065 ND 0.0075 0.0054

Notes: a. MFL = million fibers per liter, with fiber length > 10 microns.

b. Regulatory Action Level; if system exceeds, it must take certain actions such as additional monitoring, corrosion control studies and treatment, and for lead, a public education program; replaces MCL. c. The MCL for lead was rescinded with the adoption of the regulatory action level described in footnote b. d. TT = treatment technique, because an MCL is not feasible. e. No more than 5.0 percent samples total coliform-positive in a month.

f. A routine sample that is E.coli positive triggers repeat sample. If any repeat sample is total coliform, fecal coliform, or E.coli-positive the system has an acute MCL violation. g. Recommended / Upper / Short Term

h. The gross beta particle activity MCL is 4 millirem/year annual dose equivalent to the total body or any internal organ. The screening level is 50 pCi/L. The CDPH Detection Limit for Reporting (DLR) is 4 pCi/L. i. Hexavalent chromium is regulated under the total chromium MCL.

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NOTES

1. THIS SCHEMATIC HAS BEEN PREPARED, IN PART, ONTHE BASIS OF INFORMATION COMPILED BY OTHERS. THISIS NOT TO REPRESENT IN DETAIL THE EXACT LOCATIONOF COMPONENTS, THE TYPE OF COMPONENT, NORMANNER OF CONSTRUCTION.

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NOTES:1. PRELIMINARY REPRESENTATION OF KEY

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CONTROLS, AND MINOR PIPING NOT SHOWNFOR CLARITY.

3. WHOLE-HOUSE-WATER Cr TREATMENTSYSTEM REPRESENTATION IS FOR CLARITYAND NOT MEANT TO SHOW ACTUAL DESIGNOR EQUIPMENT.

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Attachment B

Hinkley School Consumer Confidence Reports

Attachment C

Results of Hinkley School Well Sampling, September 2012

September 21, 2012

Subject:

Dear Mr. Wardell:

Background

On September 6, 2012, samples were collected from the domestic well(s) on your property, well ID(s) #27-08, #27-38, #27-39 and #27-40. The samples were sent to Advanced Technology Laboratories, a California-certified laboratory, and analyzed for total chromium using U.S. Environmental Protection Agency (EPA) Method 6020A. The laboratory also analyzed the samples for hexavalent chromium using EPA Method 218.6.

The following are the results of the recent sampling:

Thank you for participating in Pacific Gas and Electric Company’s (PG&E) domestic well sampling program. The purpose of this letter is to provide you with the results of the September 2012 sampling effort. In addition, the attached table summarizes historical and current results.

Ray R. GonzalezSenior Government RelationsRepresentative

22999 Community BlvdHinkley, California 92347

760- [email protected]

Tony Wardell

551 South Avenue HBarstow, CA 92311

Assistant Superintendent of Business ServicesBarstow Unified School District

Results of Water Well Sampling - September 2012Well(s) #27-08, #27-38, #27-39 and #27-40 at 37600 Hinkley Rd., APN 0494-051-40

For sampled on 09/06/2012: Well #27-08 • Total chromium was detected at a concentration of: 1.4 parts per billion (ppb) • Hexavalent chromium was detected at a concentration of: 1.6 ppb

For sampled on 09/06/2012: Well #27-38 • Total chromium was detected at a concentration of: 1.4 ppb • Hexavalent chromium was detected at a concentration of: 1.7 ppb



The federal drinking water standard for total chromium is 100 parts per billion (ppb), and the California drinking water standard for total chromium is 50 ppb. Total chromium is the sum of all forms of chromium that may be present, including hexavalent chromium. Hexavalent chromium is currently regulated under the total chromium standard of 50 ppb.

State and Federal Drinking Water Standards

Tony Wardell

Page 2September 21, 2012Assistant Superintendent of Business Services

Next Steps

Our local, bilingual (English/Spanish) staff is available to answer any questions about the sampling results for your well(s). Please contact Jessica Davtian at (855) 816-9722 or visit our Hinkley Community Resource Office located at 22999 Community Boulevard. We are open Monday through Friday from 9 a.m. to 5 p.m. If you are unable to visit us during these hours we’d be happy to schedule a time that is convenient for you. You may also contact us by e-mail at [email protected].

My contact information is: work 760-253-7816 or cell 760-718-0664.

Thank you very much for your participation in our program.

Sincerely,

Please Contact Us With Your Questions

The sampling results from September 2012 for your well ID(s) #27-08, #27-38, #27-39 and #27-40 will be included in our to be submitted to the Water Board at the end of October 2012. Third Quarter 2012 Groundwater Monitoring Report,

Based on the results, the water from your well(s) is within the total chromium standard established by the California Department of Public Health for drinking water of 50 ppb and the Federal standard of 100 ppb.

Ray R. GonzalezSr. Governmental Relations RepresentativePacific Gas and Electric Company

cc: Jose Moreno, PGE, Community Relations Manager, Hinkley

cc: Jessica Davtian, Keadjian Associates

cc: Norman Diaz 25789 Community Blvd. Barstow, CA 92311

Attachment: Table of historical and current results

Groundwater Sampling Results - September 2012Well(s) #27-08, #27-38, #27-39 and #27-40 at 37600 Hinkley Rd., APN 0494-051-40

Well Number SampleDate Total Chromium Hexavalent Chromium

Concentrations in parts per billion (ppb)

Method 6020A Method EPA 218.6Federal State of

CA

Drinking WaterStandards for

Total Chromium

27-08 Sep-14-2006 1.86 1.98 100 50Dec-07-2006 1.82 1.80 100 50Feb-15-2007 2.08 1.82 100 50Apr-13-2007 1.37 1.44 100 50Jun-20-2007 1.89 1.88 100 50Aug-16-2007 1.66 1.62 100 50Oct-15-2007 1.25 0.855 100 50Dec-07-2007 ND <1.0 (not detected) 0.786 100 50Feb-13-2008 ND <1.0 (not detected) 0.382 100 50Apr-10-2008 ND <1.0 (not detected) 0.566 100 50Jun-12-2008 1.24 0.93 100 50Aug-06-2008 1.34 J 1.46 100 50Nov-06-2008 ND <1.0 (not detected) 1.06 100 50Feb-05-2009 1.15 0.979 100 50May-14-2009 1.22 1.14 100 50Aug-06-2009 1.37 1.11 100 50Nov-12-2009 1.21 0.89 100 50Feb-11-2010 ND <1.0 (not detected) 0.80 100 50May-13-2010 1.4 1.3 100 50Aug-05-2010 1.3 1.5 100 50Oct-28-2010 1.7 J 2.7 J 100 50Jan-21-2011 1.3 0.76 100 50Feb-07-2011 1.2 1.1 100 50Mar-08-2011 1.4 1.5 100 50Apr-07-2011 1.9 1.9 100 50May-11-2011 1.4 1.2 100 50Jun-07-2011 1.4 1.6 100 50Jul-07-2011 1.2 1.5 100 50Aug-17-2011 1.4 1.5 100 50Sep-13-2011 2.0 1.5 100 50Oct-04-2011 1.5 0.81 100 50Nov-14-2011 1.3 1.3 100 50Jan-03-2012 ND <1.0 (not detected) 0.65 100 50Feb-24-2012 1.1 1.4 100 50Mar-28-2012 1.3 1.4 100 50Apr-16-2012 1.1 1.3 100 50May-16-2012 1.3 1.4 100 50





CA


Total Chromium

Jun-14-2012 1.3 1.5 100 50Jul-12-2012 1.2 1.4 100 50Aug-09-2012 1.1 1.7 100 50Sep-06-2012 1.4 1.6 100 50

27-38 Sep-14-2006 1.23 1.44 100 50Dec-07-2006 1.56 1.46 100 50Feb-15-2007 ND <1.0 (not detected) 0.621 100 50Apr-13-2007 1.05 0.957 100 50Jun-20-2007 1.79 1.58 100 50Aug-16-2007 1.32 1.50 100 50Oct-15-2007 1.73 1.81 100 50Dec-07-2007 1.11 0.972 100 50Feb-13-2008 1.79 1.77 100 50Apr-10-2008 1.28 0.753 100 50Jun-12-2008 1.31 0.60 100 50Aug-06-2008 1.29 1.56 100 50Nov-06-2008 ND <1.0 (not detected) 1.03 100 50Feb-05-2009 ND <1.0 (not detected) ND <0.2 (not detected) 100 50May-14-2009 1.04 0.90 100 50Aug-06-2009 1.68 1.44 100 50Nov-12-2009 ND <1.0 (not detected) 0.70 100 50Feb-11-2010 ND <1.0 (not detected) 0.57 100 50May-13-2010 1.5 0.93 100 50Aug-05-2010 1.4 1.3 100 50Oct-28-2010 1.6 J 2.9 J 100 50Jan-21-2011 ND <1.0 (not detected) ND <0.2 (not detected) 100 50Feb-07-2011 ND <1.0 (not detected) 0.37 100 50Mar-08-2011 1.4 1.2 100 50Apr-07-2011 1.8 1.0 100 50May-11-2011 1.7 1.7 100 50Jun-07-2011 1.4 1.7 100 50Jul-07-2011 1.6 1.6 100 50Aug-17-2011 1.5 1.6 100 50Sep-13-2011 3.0 1.6 100 50Sep-28-2011 1.9 1.7 100 50Oct-04-2011 1.6 1.2 100 50





CA


Total Chromium

Nov-14-2011 1.3 1.1 100 50Jan-03-2012 ND <1.0 (not detected) 0.62 100 50Feb-24-2012 ND <1.0 (not detected) 0.42 100 50Mar-28-2012 1.4 1.2 100 50Apr-16-2012 ND <1.0 (not detected) 0.73 100 50May-16-2012 1.2 0.91 100 50Jun-14-2012 1.4 1.5 100 50Jul-12-2012 1.4 1.4 100 50Aug-09-2012 1.3 1.7 100 50Sep-06-2012 1.4 1.7 100 50

27-39 Sep-14-2006 1.22 1.42 100 50Dec-07-2006 ND <1.0 (not detected) 0.342 100 50Feb-15-2007 1.95 1.73 100 50Apr-13-2007 2.12 0.745 100 50Jun-20-2007 1.49 1.54 100 50Aug-16-2007 1.25 1.50 100 50Oct-15-2007 1.49 1.31 100 50Dec-07-2007 1.10 1.09 100 50Feb-13-2008 1.69 0.51 100 50Apr-10-2008 1.24 0.897 100 50Jun-12-2008 1.47 1.11 100 50Aug-06-2008 1.26 J 1.53 100 50Nov-06-2008 ND <1.0 (not detected) 1.46 100 50Feb-05-2009 ND <1.0 (not detected) 0.543 100 50May-14-2009 1.46 1.29 100 50Aug-06-2009 1.44 1.18 100 50Nov-12-2009 1.13 0.73 100 50Feb-11-2010 1.00 0.70 100 50May-13-2010 1.1 0.77 100 50Aug-05-2010 1.5 1.7 100 50Oct-28-2010 1.3 0.88 100 50Jan-21-2011 1.6 1.2 100 50Feb-07-2011 1.8 1.6 100 50Mar-08-2011 ND <1.0 (not detected) 0.20 100 50Apr-07-2011 1.8 1.2 100 50May-11-2011 2.0 1.7 100 50





CA


Total Chromium

Jun-07-2011 1.6 1.6 100 50Jul-07-2011 1.6 1.4 100 50Aug-17-2011 1.7 1.6 100 50Sep-13-2011 2.0 1.6 100 50Oct-04-2011 1.1 0.65 100 50Nov-14-2011 2.0 1.9 100 50Jan-03-2012 1.0 0.17 100 50Feb-24-2012 1.5 1.2 100 50Mar-28-2012 1.1 0.71 100 50Apr-16-2012 ND <1.0 (not detected) 0.62 100 50May-16-2012 1.2 1.1 100 50Jun-14-2012 1.3 1.3 100 50Jul-12-2012 1.5 1.5 100 50Aug-09-2012 1.2 1.7 100 50Sep-06-2012 1.3 1.3 100 50

27-40 Sep-14-2006 1.89 2.15 100 50Dec-07-2006 1.92 1.98 100 50Feb-15-2007 2.26 1.95 100 50Apr-13-2007 1.75 2.07 100 50Jun-20-2007 1.93 2.05 100 50Aug-16-2007 2.08 1.94 100 50Oct-15-2007 1.88 2.10 100 50Dec-07-2007 2.10 1.98 100 50Feb-13-2008 2.00 1.95 100 50Apr-10-2008 2.20 1.92 100 50Jun-12-2008 1.84 1.81 100 50Aug-06-2008 1.64 1.84 100 50Nov-06-2008 1.19 1.80 100 50Feb-05-2009 1.69 1.61 100 50May-14-2009 1.78 1.61 100 50Aug-06-2009 1.84 1.66 100 50Nov-12-2009 1.70 1.28 100 50Feb-11-2010 1.04 1.36 100 50May-13-2010 2.0 1.9 100 50Aug-05-2010 1.7 2.0 100 50Oct-28-2010 1.9 2.1 100 50





CA


Total Chromium

Jan-21-2011 1.9 1.7 100 50Feb-07-2011 1.6 1.5 100 50Mar-08-2011 1.9 1.9 100 50Apr-07-2011 2.2 1.9 100 50May-11-2011 2.5 2.0 100 50Jun-07-2011 2.0 2.0 100 50Jul-07-2011 1.7 2.0 100 50Aug-17-2011 1.8 1.8 100 50Sep-13-2011 2.0 2.0 100 50Oct-04-2011 2.2 1.8 100 50Nov-14-2011 1.9 1.9 100 50Jan-03-2012 1.6 1.6 100 50Feb-24-2012 1.7 2.0 100 50Mar-28-2012 1.9 2.0 100 50Apr-16-2012 1.7 1.9 100 50May-16-2012 1.7 1.9 100 50Jun-14-2012 1.8 2.0 100 50Jul-12-2012 1.7 1.9 100 50Aug-09-2012 1.5 2.1 100 50Sep-06-2012 1.8 2.1 100 50

Drinking Water Standard:

Key to Groundwater Sampling Results

Not SampledNot DetectedA "J" shown next to a concentration indicates that the concentration is estimated based on data validation and quality control criteria

The less than (<) symbol, if shown, in front of a result indicates that the compound was not detected (ND) in the groundwater sample. Analytical equipment is limited by its capability to detect a compound below a specific level, and this limit is expressed on the table with a less than (<) symbol in front of the number representing the concentration below which the instrument cannot measure.

--

NDJ

<

The federal drinking water standard for total chromium is 100 ppb and the California drinking water standard for total chromium is 50 ppb. Total chromium is the sum of all forms of chromium that may be present, including hexavalent chromium. Hexavalent chromium is currently regulated under the total chromium standard of 50 ppb.

Total Chromium results are for Total Chromium in a dissolved form. Samples are filtered before being analyzed.

Tony Wardell_0494‐051‐40_September‐2012

Attachment D

Email from San Bernardino County Department of Health regarding CEQA Reporting Exemption

1

Shakeel Jogia

From: Alspach, Brent <[email protected]>Sent: Thursday, August 09, 2012 1:21 PMSubject: FW: Hinkley Elementary School: July 12 meeting action items - follow-up

From: Chakma, Joy [mailto:[email protected]] Sent: Thursday, August 09, 2012 9:09 AM To: Alspach, Brent Cc: Troy, Jane; Younger, Jheri Subject: RE: Hinkley Elementary School: July 12 meeting action items - follow-up Hi Brent, You will find the outline for a technical report in the attached file IV. PREPARATION OF THE TECHNICAL REPORT.

A CEQA report will not be required unless you are planning to install a storage tank > 100,000 gallons. Jheri had informed me that she was unable to find any well permit information on proposed PG & E wells. It will be great if you can obtain that information since community grade wells are required for a public water system. Thank you.

Joy Chakma, R.E.H.S.

County of San Bernardino Environmental Health Services 385 N. Arrowhead Avenue, 2nd Floor San Bernardino, CA 92415-0160 Phone 1-800-442-2283 Fax (909) 387-4323 www.sbcounty.gov/dehs

From: Alspach, Brent [mailto:[email protected]] Sent: Tuesday, August 07, 2012 4:01 PM To: Chakma, Joy; Troy, Jane; Younger, Jheri Cc: Means, Edward; McCarthy, Jeffrey Subject: Hinkley Elementary School: July 12 meeting action items - follow-up Joy - I just wanted to follow-up with you in regard to the EHS actions items from our meeting on July 12 (please see my message below). We’re at the point that we’d like to begin the preliminary engineering report (PER), and the sample document (or even the outline / table of contents) would be a useful template. This will help us ensure that the PER covers all of the applicable information that you need, thus hopefully making your review as straightforward as possible and avoiding multiple iterations. If you could quickly address the CEQA question below, as well, that would be great. Jherii / Jane – I’ll reply to you both via our parallel e-mail thread on the water system permits, cc’ing Joy to keep him in the loop, as well. Thanks in advance for the help. Regards, Brent

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