24001 Stevens Creek Blvd.

Cupertino, CA 95014 (408) 996-4000

January 31, 2018

VIA EMAIL & CERTIFIED MAIL/RETURN RECEIPT NPDES Wastewater Division California Regional Water Quality Control Board San Francisco Bay Region 1515 Clay Street Suite 1400 Oakland, CA 94612

RE: Lehigh Southwest Cement Company—Permanente Plant

NPDES Permit number CA0030210 Annual Self-Monitoring Report (SMR), 2017

To whom it may concern: This constitutes the annual self-monitoring report for the above-referenced facility. This report is for calendar year 2017. ANNUAL COMPLIANCE SUMMARY TABLE OF TREATMENT PLANT PERFORMANCE

This is not required as Lehigh has submitted the year’s monitoring results to CIWQS. COMPREHENSIVE DISCUSSION OF TREATMENT PLANT PERFORMANCE AND COMPLIANCE The West Final Treatment System (West -FTS) was in place and functional as of October 1, 2017. To augment the treatment capacity, Lehigh is constructing the East- FTS, which is targeted to be completed by the end of April 2018. Lehigh began discharging from the West -FTS on December 6, 2017. A total of 8.3 million galls (MG) was discharged during December. Results from the five sampling results collected throughout December demonstrated good performance where all permit limits where met except for one result for selenium, which was above the daily permit limit. The cause of the elevated selenium was noted and corrected on the same day. No other detections above the permit limit have been noted. Below is a summary of select metals results of the FTS effluent (EFF-001).

EFF-001 Chromium Date (VI) Mercury Nickel Selenium

Units ug/L ug/L ug/L ug/L 12/8/2017 0.31 ND<0.00050 4.3 0.21 J 12/14/2017 0.18 J ND<0.00050 3.5 0.54 J 12/21/2017 4.7 0.0024 41 15 12/22/2017 0.17 J 0.00083 3.4 0.72 J 12/28/2017 0.44 ND<0.00050 ND<4.8 ND<0.19

J = estimated value

Prior to October 1, 2017, the interim treatment system (ITS) was in operation and performed well by consistently achieving over 50% removal for metals. There was a two week period where faulty nutrient-feed to the bioreactor led to less than optimal ITS performance. As noted in the November 10, 2018 report, Lehigh completed a root cause investigation and taken measures to prevent from happening again. TABULAR AND GRAPHICAL SUMMARIES OF MONITORING DATA

This is not required as Lehigh has submitted the year’s monitoring results to CIWQS. LIST OF APPROVED ANALYSES

Lehigh does not have a laboratory that is certified for any analyses. Below is a list of analyses that are conducted by outside, certified laboratories.

• Oil and grease • Total suspended solids • Settleable matter • Metals (including Se, Cr6+, Hg, Ni, Tl, Sb, As, Be, Cd, Cu, Pb, Ag, and Zn) • Total dissolved solids • Toxicity (acute and chronic) • Volatile organic compounds • Semi-volatile compounds • Dioxins • Furans • Asbestos • Sulfides, chloride, hardness

Lehigh has no “waived” analyses.

DRAWING

A drawing showing the facility, flow routing, and sampling and observations stations is attached.

EFFLUENT CHARACTERIZATION The annual effluent characterization sampling results were collected in April and reported with the April SMR. The sample was analyzed for the additional priority pollutants not already sampled as part of the routine monitoring at Discharge Point 001. Antimony was detected at 6.3 ug/L, which is above the water quality criteria as listed in the Permit Fact Sheet Table F-6. 4,4-DDE (0.0028 ug/L), 4,4-DDT (0.011 ug/L), and Dieldrin (0.0047 ug/L) were also detected above listed water quality criteria. The sampling will be repeated during the first quarter of 2018. AMBIENT BACKGROUND SAMPLING Ambient background sampling at RSW-001A was conducted in January 2017 (wet season) and May 2017 (dry season) for the priority pollutants listed in Attachment G, Table C, plus pH, salinity, hardness, temperature, turbidity, and total dissolved solids (TDS). The results were reported with the associated monthly SMRs. No organic compounds were detected in either sample. For the two samples, pH ranged from 7.76 to 8.15, salinity from 13 mg/L to 16 mg/L, hardness from 250 to 320 mg/L, TDS from 280 to 300 mg/L. Several metals were also detected including selenium at an estimated value of 0.585 J ug/L and hexavalent chromium up to 0.65 ug/L. RESULTS OF ANNUAL FACILITY INSPECTION

No major changes were made to the stormwater pollution and prevention plan (SWPPP) as a result of the facility inspection on September 9, 2017. The following minor changes were made:

• Updated contact information FACILITY REPORT REVIEWS

The Best Management Practices (BMP) plan and Facility Reliability Assurance Plan (FRAP) were reviewed on January 9, 2017.

The Spill Prevention, Control, and Countermeasure (SPCC) plan was reviewed in 9/28/2017. The facility contact information was updated, the materials inventory was updated, and other minor revisions were made.

Lehigh continued to work on updating Hazardous Material Business Plan (HMBP) maps in the CERS database. Representative of the Santa Clara County Department of Environmental Health have requested several revisions. Please feel free to contact me at 408-996-4233 with any questions or comments. ____________________________ Tressa Jackson Area Environmental Manager Enclosure CC (via email): John Madigan, RWQCB

Keith Krugh, Lehigh Erika Guerra, Lehigh Nicole Granquist, Downey Brand LLP

DINKY SHED

POND 30

POND 20

POND 1

POND 11 E&W

POND 17

PIPELINE F

POND 13B

POND 9

PIPELINE C

PIPELINE D

PIT (POND 4A)

POND

20

POND 30

CP4

P 20

DIVCP1

CP3

PIPE

LIN

E E

POND 1 DIV ECP2

POND 11

SP1

PIPE

LINE

A

POND 11DIV A

POND 11DIV F

POND 9

PIPE

LINE

B

ROCKPLANTAREA

RP1A

RP1

RP2

P17

CONSULTANT

DESIGN

PREPARED

REVIEW

APPROVED

YYYY-MM-DD TITLE

PROJECT No. Rev.

PROJECTCLIENT

IF T

HIS

MEA

SUR

EMEN

T D

OES

NO

T M

ATC

H W

HAT

IS S

HO

WN

, TH

E SH

EET

SIZE

HAS

BEE

N M

OD

IFIE

D F

RO

M: A

NSI

B

Path

: \\D

enve

r.gol

der.g

ds\a

cad\

12\1

23-8

1502

\PR

OD

UC

TIO

N\0

005\

in p

rogr

ess

(tem

p)\

| Fi

le N

ame:

201

7 C

urre

nt H

ydro

logy

for P

ond

20 A

rea

with

30.

dwg

01

in

1238150212CONTROL1400

FIGURE

1----

2015-05-14

MBR

MBR

MBR

XXX

CATCHMENT REVIEW LEHIGH SOUTHWEST CEMENT CO.PERMANENTE PLANTSANTA CLARA COUNTY, CALIFORNIA

CATCHMENT AREA MAP

RECLAMATION BOUNDARY

EXISTING TOPOGRAPHY

1200

1. DRAWING COORDINATES: NAD83 CALIFORNIA STATE PLANE, ZONE III, US FOOT.

2. EXISTING TOPOGRAPHY SHOWN IS BASED ON AERIAL SURVEY PERFORMED JUNE2016, PROVIDED BY ALPHA SURVEYING.

LEGEND

REFERENCE

500250

FEET

0

SCALE

CP1, CP2, CP3, CP4, POND 1 DIV EREPORT TO POND 1

POND 11 DVIA, POND 11 DIV F, POND 11REPORT TO POND 11